Patent Publication Number: US-2015061519-A1

Title: Control Apparatus, Control System, and Control Method

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is based upon and claims the benefit of priorities from Japanese Patent Application No. 2013-180603 filed on Aug. 30, 2013; the entire contents of which are incorporated herein by reference. 
     FIELD 
     Embodiments described herein relate to a control apparatus, a control system, and a control method. 
     BACKGROUND 
     In recent years, there is known a luminaire control system that makes it possible to individually control a plurality of luminaires. The luminaire control system includes a host apparatus that transmits a control signal for instructing control of extinction, lighting, a change of illuminance, and the like to the luminaires and a luminaire including a power supply device that controls a lighting device such as an LED (Light Emitting Diode) according to the control signal received from the host apparatus. However, the control signal transmitted to the luminaires by the host apparatus is different for each of types of luminaire control systems. Therefore, the conventional luminaire needs a power supply device corresponding to the control signal different for each of the types of the luminaire control systems. Therefore, the same model of the conventional luminaire cannot be adapted to a plurality of types of luminaire control systems. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a diagram showing a configuration example of a lighting system according to a first embodiment; 
         FIG. 2  is a diagram for explaining a configuration example of a luminaire according to the first embodiment; 
         FIGS. 3A to 3C  are diagrams for explaining types of control signals; 
         FIGS. 4D and 4E  are diagrams for explaining examples of rectifying circuits; 
         FIG. 5  is a diagram for explaining a configuration example of an interface circuit according to the first embodiment; 
         FIG. 6  is a diagram for explaining functional components included in a microcomputer according to the first embodiment; 
         FIG. 7  is a flowchart for explaining a procedure of processing executed by the luminaire; 
         FIG. 8  is a diagram for explaining a first modification of the interface circuit; 
         FIG. 9  is a diagram for explaining a second modification of the interface circuit; 
         FIG. 10  is a diagram for explaining a third modification of the interface circuit; 
         FIG. 11  is a diagram showing waveforms generated by delaying a rising edge of a control signal subjected to half-wave rectification; 
         FIG. 12  is a diagram for explaining a first modification of the microcomputer; 
         FIG. 13  is a diagram for explaining a modification of the functional components included in the microcomputer; 
         FIG. 14  is a diagram showing an example of a correspondence between pin switches and a system to be specified; 
         FIG. 15  is a diagram for explaining a second modification of the microcomputer; and 
         FIG. 16  is a diagram showing an example of a correspondence between a value of a voltage applied to the pin switch and a system to be specified. 
     
    
    
     DETAILED DESCRIPTION 
     It is an object of the present invention to provide a luminaire adapted to a plurality of types of luminaire control systems. 
     In general, according to one embodiment, there is provided a power-supply control section  10  including a receiving section  16 , a specifying section  17 , and control sections  18  to  20 . The receiving section  16  receives a control signal. The specifying section  17  specifies a control system corresponding to the control signal received by the receiving section  16 . The control sections  18  to  20  derive, according to the control system specified by the specifying section  17 , control designated by the control signal received by the receiving section  16 , and apply the derived control to an LED  9 . 
     The power-supply control section  10  according to the embodiment may further include a rectifying section  15 . The rectifying section  15  may generate a first signal obtained by subjecting the control signal to full-wave rectification and a second signal obtained by subjecting the control signal to half-wave rectification. The receiving section  16  may output one of the first signal and the second signal generated by the rectifying section  15  to the control sections  18  to  20 . 
     The power-supply control section  10  according to the embodiment may further include a plurality of input sections  25   a  to  25   d.  A predetermined voltage may be applied to the input sections  25   a  to  25   d.  The specifying section  17  may specify, according to a value of the voltage applied to the input sections  25   a  to  25   d  or a combination of the input sections  25   a  to  25   d  applied with the voltage, the control system corresponding to the control signal received by the receiving section  16 . 
     In the power-supply control section  10  according to the embodiment, the specifying section  17  may include a specifying mode for specifying a control system and specify, only when the specifying mode is effective, a system that uses the control signal received by the receiving section  16 . 
     According to another embodiment, there is provided a lighting system  1  including a power-supply control section  10  and a host apparatus  2 . The host apparatus  2  includes a transmitting section configured to transmit a control signal to the power-supply control section  10 . The power-supply control section  10  includes a receiving section  16 , a specifying section  17 , and control sections  18  to  20 . The receiving section  16  receives a control signal of a luminaire. The specifying section  17  specifies a control system corresponding to the control signal received by the receiving section  16 . The control sections  18  to  20  derive, according to the control system specified by the specifying section  17 , control designated by the control signal received by the receiving section  16 , and apply the derived control to the LED  9 . 
     In the lighting system  1  according to the embodiment, the transmitting section may output a system signal indicating the control system corresponding to the control signal at predetermined timing. The specifying section  17  may specify the control system indicated by the system signal output from the transmitting section. 
     The lighting system  1  and the power-supply control section  10  according to embodiments are explained below with reference to the drawings. In the embodiments, the same components are denoted by the same reference numerals and signs and redundant explanation of the components is omitted. 
     First Embodiment 
     First, a lighting system according to a first embodiment is explained with reference to  FIGS. 1 to 7 . 
     Example of the Configuration of the Lighting System 
       FIG. 1  is a diagram showing a configuration example of the lighting system according to the first embodiment. A lighting system  1  shown in  FIG. 1  is a system that realizes control and monitoring of luminaires set in a home, an office, and the like. For example, in some case, the lighting system  1  acquires, with a sensor or the like, information concerning an environment in which luminaires are set such as T/Flecs (registered trademark) and performs control of the luminaires. 
     A host apparatus  2  and a plurality of communication sections  3  and  4  are connected to the lighting system  1  shown in  FIG. 1 . The communication section  3  is connected to a plurality of luminaires  5  to  7 . The communication section  4  is connected to a luminaire  8 . The luminaire  5  includes an LED  9 , which is a lighting section configured to light an arbitrary place, and a power-supply control section  10  configured to perform control of the LED  9 . The communication section  4  has a function same as a function of the communication section  3 . Explanation of the communication section  4  is omitted below. The luminaires  6  to  8  have a function same as a function of the luminaire  5 . Explanation of the luminaires  6  to  8  is omitted below. The numbers of the communication sections  3  and  4  and the number of the luminaires  5  to  8  included in the lighting system  1  shown in  FIG. 1  are only an example and can be changed as appropriate according to the configuration of the lighting system  1 . 
     The host apparatus  2  outputs a control signal for instructing control of the luminaires to the communication section  3  and the communication section  4 . For example, the host apparatus  2  outputs a control signal for instructing arbitrary control such as lighting, extinction, a change of illuminance, or a change of a color of light of the LED  9  included in the luminaire  5  to the communication section  3 . The host apparatus  2  can use a control system of an arbitrary type in order to perform the control of the luminaires. For example, the host apparatus  2  outputs control signals corresponding to various control systems such as T/Flecs (registered trademark), DALI (Digital Addressable Lighting Interface), and PWM (Pulse Width Modulation) in order to control the luminaires. 
     The host apparatus  2  outputs a different control signal for each of the control systems. For example, the host apparatus  2  outputs, according to types of the control systems, a control signal indicating control content in positions of a rising edge and a falling edge of a voltage, a control signal indicating control content according to whether a falling edge is present or a rising edge is present when a pulse is divided at a fixed cycle, a control signal indicating control content with modulation of pulse width, and the like. The host apparatus  2  outputs, according to the types of the control systems, a control signal in which a voltage changes in a range of both positive and negative poles and a control signal in which a voltage changes in one of positive and negative ranges. 
     A detailed example is explained. If a control signal of T/Flecs is output, the host apparatus  2  outputs a double pole signal in which a voltage changes in a range of both positive and negative poles. The double pole signal is a control signal indicating control content in positions of a rising edge and a falling edge of the voltage. If the host apparatus  2  outputs a control signal of DALI, the host apparatus  2  outputs a single pole signal in which a voltage changes in one of positive and negative ranges. The single pole signal is a control signal indicating control content according to whether a falling edge is present or a rising edge is present when a pulse is divided at a fixed cycle. If the host apparatus  2  outputs a control signal using PWM, the host apparatus  2  outputs a single pole signal, which is a control signal indicating control content with modulation of pulse width. 
     The communication section  3  is a relay device configured to relay communication between the host apparatus  2  and the luminaires  5  to  7 . For example, when the communication section  3  receives a control signal indicating control of the LED  9  from the host apparatus  2 , the communication section  3  outputs the received control signal to the luminaire  5  including the LED  9 . If the communication section  3  receives a response signal indicating that the control of the LED  9  is finished and a notification signal indicating a state of the LED  9  from the luminaire  5 , the communication section  3  transmits the received response signal and the received notification signal to the host apparatus  2 . As a result, the host apparatus  2  can confirm that the control of the LED  9  is completed and a dimming state of the LED  9 . 
     The luminaire  5  is a luminaire installed in, for example, a home or an office. The luminaire  5  includes the LED  9 , which is replaceable light and the power-supply control section  10  configured to perform the control of the LED  9 . Like the conventional luminaire, the luminaire  5  is a unit of setting or replacement when the lighting system  1  is set or updated. The conventional luminaire is adapted to only a control signal of a control system of a specific type. Therefore, the conventional luminaire needs to have a different power-supply control section for each of control systems of the host apparatus  2 . 
     On the other hand, the power-supply control section  10  included in the luminaire  5  executes processing explained below. First, the power-supply control section  10  receives a control signal output by the host apparatus  2  from the communication section  3 . The power-supply control section  10  specifies a control system corresponding to the received control signal. For example, the power-supply control section  10  specifies the control system corresponding to the received control signal on the basis of a change in the potential of the received control signal, a waveform of a pulse included in the control signal, a cycle of the pulse, and the like. The power-supply control section  10  derives control content indicated by the received control signal according to the specified control system and executes the control of the derived content on the LED  9 . 
     Therefore, the same luminaire  5  can be adapted to a type of the control system of the host apparatus  2  irrespective of the type. As a result, for example, when the control system of the host apparatus  2  is changed, the lighting system  1  can control the luminaires  5  to  8  using a new control system even if the luminaires  5  to  8  are not replaced with luminaires corresponding to the new control system. When any one of the luminaires is broken, in the lighting system  1 , the luminaire  5  only has to be set instead of the broken luminaire even if the same luminaire is prepared. As a result, in the lighting system  1 , it is possible to flexibly perform setting and replacement of the luminaires  5  to  8 . 
     Example of the Configuration of the Luminaire  5   
     A configuration example of the power-supply control section  10  is explained below with reference to  FIG. 2 .  FIG. 2  is a diagram for explaining a configuration example of the luminaire according to the first embodiment. As shown in  FIG. 2 , the power-supply control section  10  includes a power supply circuit  11 , an interface circuit  12 , a microcomputer  13 , and a control circuit  14 . A power supply of electric power supplied to the LED  9  is connected to the power supply circuit  11 . 
     Example of the Configuration of the Power Supply Circuit  11   
     The power supply circuit  11  is a circuit configured to change, according to control by the control circuit  14 , electric power supplied to the LED  9 . For example, the power supply circuit  11  receives supply of electric power from the power supply. When the power supply circuit  11  receives a control signal from the control circuit  14 , the power supply circuit  11  performs, according to the received control signal, for example, control of an amount of the electric power, which is supplied from the power supply, supplied to the LED  9  to perform lighting, extinction, a change of illuminance, a change of a color of light, and the like of the LED  9 . 
     Example of the Configuration of the Interface Circuit  12   
     The interface circuit  12  includes a rectifying circuit configured to rectify a control signal received from the communication section  3  and outputs the control signal rectified using the rectifying circuit to the microcomputer  13 . Specifically, the interface circuit  12  rectifies the control signal to a single pole side to enable the microcomputer  13  to identify control content. 
     Since it is unknown whether the host apparatus  2  outputs a double pole signal or outputs a single pole signal, the interface circuit  12  needs to appropriately rectify both of the double pole signal and the single pole signal. However, if the control signal received from the communication section  3  is simply subjected to full-wave rectification or half-wave rectification, the interface circuit  12  cannot perform appropriate rectification depending on a type of the control signal. 
     A correspondence between a type of a control signal and a rectifying method is explained with reference to  FIGS. 3 and 4 . First, examples of control signals output by the host apparatus  2  is explained with reference to  FIGS. 3A to 3C .  FIGS. 3A to 3C  are diagrams for explaining types of control signals. In  FIGS. 3A to 3C , a plurality of examples of control signals output by the host apparatus  2  are shown. 
     For example, in some case, the host apparatus  2  outputs, as a control signal, a double pole signal in which a voltage changes in a range of both positive and negative poles as shown in  FIG. 3A . In some case, the host apparatus  2  outputs, as a control signal, a control signal in which a voltage changes in a positive range as shown in  FIG. 3B  or a single pole signal in which a voltage changes in a negative range. 
     Examples of rectifying circuits configured to rectify a control signal are explained with reference to  FIGS. 4D and 4E .  FIGS. 4D and 4E  are diagrams for explaining examples of rectifying circuits. In the examples shown in  FIGS. 4D and 4E , an example of a rectifying circuit configured to subject a control signal to full-wave rectification is shown in  FIG. 4D  and an example of a rectifying circuit configured to subject a control signal to half-wave rectification is shown in  FIG. 4E . In  FIG. 4D and 4E , the rectifying circuits are indicated by a sign of a diode and a diamond figure surrounding the sign. The rectifying circuits are not limited to a bridge type and may be rectifying circuits including, for example transformers. In the following explanation and in the figures, a rectifying circuit is indicated by a sign same as the sign shown in  FIGS. 4D and 4E . 
     For example, if the single pole signal shown in  FIGS. 3B and 3C  is rectified, it is unknown from which side of a positive pole side and a negative pole side a signal is output depending on a direction of a wire. Therefore, the interface circuit  12  inputs the positive pole side of the control signal to an input #1 of the circuit shown in  FIG. 4D  and inputs the negative pole side of the control signal to an input #2 of the circuit. As a result, the interface circuit  12  can output the control signal rectified to the positive pole side from an output #1 or an output #2. 
     However, if the double pole signal shown in  FIG. 3A  is input to the circuit shown in  FIG. 4D , signals on respective pole sides of the double pole signal are aggregated on the positive pole side. Therefore, the interface circuit  12  outputs a direct-current voltage from the output #1 or the output #2. In such a case, the microcomputer  13  cannot identify control content from the control signal. Therefore, the interface circuit  12  cannot perform appropriate rectification with the circuit shown in  FIG. 4D . 
     For example, if the double pole signal shown in  FIG. 3A  is rectified, the interface circuit  12  inputs the control signal to the input #1 and the input #2 of the circuit shown in  FIG. 4E . As a result, the interface circuit  12  can output a control signal rectified to the single pole side from the output #1 and the output #2. However, if the single pole signal shown in  FIG. 3B  or  3 C is input to the circuit shown in  FIG. 4E , the interface circuit  12  cannot output the single pole signal on the positive pole side or the single pole signal on the negative pole side. As a result, in some case, the microcomputer  13  cannot identify control content from the control signal. Therefore, the interface circuit  12  cannot perform appropriate rectification with the circuit shown in  FIG. 4E . 
     The interface circuit  12  generates a signal obtained by subjecting the control signal to full-wave rectification and a signal obtained by subjecting the control signal to half-wave rectification. The interface circuit  12  outputs the generated signals to the microcomputer  13 . As a result, the microcomputer  13  can identify control content indicated by the control signal using at least one of the signals output from the interface circuit  12 . 
     A configuration example of the interface circuit  12  is explained with reference to  FIG. 5 .  FIG. 5  is a diagram for explaining a configuration example of the interface circuit according to the first embodiment. In the example shown in  FIG. 5 , the interface circuit  12  includes the rectifying section  15  including the respective pole sides of the control signal as the input #1 and the input #2 and including the output #1 obtained by combining the output on the positive pole side and the output on the negative pole side and the output #2 obtained by combining the input #1 and the output on the negative pole side. 
     The rectifying section  15  is, for example, a rectifying circuit realized by a circuit including a diode and a transformer connected in a bridge type. The rectifying circuit  15  is indicated by a sign of a diode and a diamond figure surrounding the sign. The output #1 and the output #2 of the rectifying section  15  are connected to the microcomputer  13 . 
     The interface circuit  12  outputs a signal obtained by subjecting the control signal to full-wave rectification to the microcomputer  13  from the output #1 of the rectifying section  15  and outputs a signal obtained by subjecting the control signal to half-wave rectification to the microcomputer  13  from the output #2 of the rectifying section  15 . Therefore, for example, if the control signal received from the communication section  3  is a single pole signal on the positive pole side or the negative pole side, the interface circuit  12  can output a signal for enabling the microcomputer  13  to identify control content to the output #1 or the output #2 according to the pole of the input single pole signal. If the control signal received from the communication section  3  is a double pole signal, the interface circuit  12  can output the signal for enabling the microcomputer  13  to identify control content from the output #2. 
     Example of the Configuration of the Microcomputer  13   
     Referring back to  FIG. 2 , the microcomputer  13  is a micro controller that executes a computer program prepared in advance to display a predetermined function. The microcomputer  13  is realized by an integrated circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array). The microcomputer  13  may be realized by, for example, a CPU (Central Processing Unit) or an MPU (Micro Processing Unit). 
     The microcomputer  13  executes the computer program prepared in advance to display a function explained below. First, the microcomputer  13  receives a signal rectified by the interface circuit  12 . In such a case, the microcomputer  13  specifies a control system of the host apparatus  2  using the rectified signal. That is, the microcomputer  13  specifies a control system corresponding to a control signal received by the power-supply control section  10 . The microcomputer  13  derives, according to the specified control system, control content indicated by the received signal and outputs an execution instruction for the derived control content to the control circuit  14 . 
     An example of functional components included in the microcomputer  13  is explained with reference to  FIG. 6 .  FIG. 6  is a diagram for explaining functional components included in the microcomputer according to the first embodiment. In the example shown in  FIG. 6 , the microcomputer  13  includes a receiving section  16 , a specifying section  17 , and a plurality of control sections  18  to  20 . In the example shown in  FIG. 6 , although not shown in the figure, the microcomputer  13  may further include a control section similar to the control section  18 . 
     The receiving section  16  receives a control signal from the interface circuit  12 . For example, the receiving section  16  receives a signal obtained by rectifying the control signal from the interface circuit  12 . In such a case, the receiving section  16  selects, out of the received signals, a signal suitable for identifying control content indicated by the control signal. 
     If the receiving section  16  does not receive designation of a control section from the specifying section  17 , for example, if the receiving section  16  receives the control signal for the first time after the luminaire  5  is set, the receiving section  16  outputs the signals received from the interface circuit  12  to the specifying section  17  for a predetermined time interval. If the receiving section  16  receives designation of a control section to be an output designation of a signal among the control sections  18  to  20  from the specifying section  17 , the receiving section  16  transmits signals received from the interface circuit  12  thereafter to the control section designated by the specifying section  17 . 
     As processing for selecting a signal suitable for identifying control content indicated by the control signal among the signals received from the interface circuit  12  by the receiving section  16 , the receiving section  16  executes processing explained below. For example, if the receiving section  16  receives a double pole signal when the interface circuit  12  includes the configuration shown in  FIG. 5 , the receiving section  16  receives a direct-current voltage from the output #1 and receives a rectified signal from the output #2. If the receiving section  16  receives a single pole signal when the interface circuit  12  includes the configuration shown in  FIG. 5 , the receiving section  16  receives, according to a pole direction of the single pole signal, rectified signals from the output #2 or both of the output #1 and the output #2. Therefore, the receiving section  16  only has to select a signal including a pulse out of the signal received from the output #1 and the signal received from the output #2. 
     The luminaire  5 , to which a double pole signal of T/Flecs is input from the host apparatus  2 , outputs a response via a signal line same as a signal line of the input signal. If such processing is executed, the balance of pole directions in the double pole signal is lost. Therefore, as a result of the double pole signal being input when the interface circuit  12  includes the configuration shown in  FIG. 5 , if a plurality of signals including pulses are received from the interface circuit  12 , the receiving section  16  only has to select a signal having a predominant voltage, that is, a signal with which control content is more easily identified and perform identification of the control content. By executing such processing, the receiving section  16  uses a signal more suitable for specifying the control content. Therefore, it is possible reduce the influence of noise in a connection line for connecting the host apparatus  2  and the luminaire  5 . 
     The specifying section  17  specifies a control system corresponding to the control signal received by the luminaire  5 . For example, the specifying section  17  receives the signal selected by the receiving section  16  for a predetermined time interval. The specifying section  17  specifies, on the basis of a change in the potential of the received signal, a waveform of the pulse included in the signal, a cycle of the pulse, and the like, a control system corresponding to the control signal received by the luminaire  5 . 
     As an example of processing executed by the specifying section  17 , an example of processing for determining whether the control system corresponding to the control signal received by the luminaire  5  is T/Flecs, DALI, or PWM is explained below. Embodiments are not limited to this. The specifying section  17  only has to specify, according to a characteristic of the control signal, the control system corresponding to the control signal received by the luminaire  5 . 
     First, the specifying section  17  determines whether the control signal received by the luminaire  5  is a double pole signal or a single pole signal. For example, when the interface circuit  12  includes the configuration shown in  FIG. 5 , if a signal on the output #1 side is a direct-current voltage and a signal on the output #2 side is a rectified signal, the specifying section  17  determines that the control signal is a double pole signal. If the specifying section  17  determines that the control signal is the double pole signal, the specifying section  17  determines that the control system corresponding to the control signal received by the luminaire  5  is T/Flecs. 
     On the other hand, when the interface circuit  12  includes the configuration shown in  FIG. 5 , if the signal on the output #2 side is a rectified signal or both the signals on the output #1 side and the output #2 side are rectified signals, the specifying section  17  determines that the control signal is a single pole signal. If the specifying section  17  determines that the control signal is the single pole signal, the specifying section  17  determines cycles of a pulse included in the signal. 
     If the determined cycle of the pulse is equal to or smaller than a predetermined threshold, for example, equal to or smaller than 10 milliseconds, the specifying section  17  determines that the control system corresponding to the control signal received by the luminaire  5  is DALI. On the other hand, if the determined cycle of the pulse is larger than the predetermined threshold, the specifying section  17  determines whether the cycle of the pulse is fixed. If the specifying section  17  determines that the cycle of the pulse is fixed, the specifying section  17  determines that the control system corresponding to the control signal received by the luminaire  5  is PWM. 
     DALI indicates control content according to whether a rising edge of the pulse is included or a falling edge of the pulse is included when the control signal is divided by a predetermined time interval (the cycle of the pulse). Therefore, depending on the time interval of the control signal used in specifying the control content and the cycle of the pulse, the cycle of the pulse cannot be accurately calculated. Therefore, if the specifying section  17  determines that the cycle of the pulse is not fixed, the specifying section  17  determines that the control system corresponding to the control signal received by the luminaire  5  is DALI. 
     The specifying section  17  derives the control content from the control signal according to the specified control system and designates, to the receiving section  16 , a control section that applies control of the derived content to the LED  9 , that is, a control section corresponding to the specified control system. For example, the specifying section  17  stores in advance that the control section  18  corresponds to T/Flecs, the control section  19  correspond to DALI, and the control section  20  corresponds to PWM. If the specified control system is T/Flecs, the specifying section  17  notifies the receiving section  16  of the control section  18 . If the specified control system is DALI, the specifying section  17  notifies the receiving section  16  of the control section  19 . If the specified control system is PWM, the specifying section  17  notifies the receiving section  16  of the control section  20 . 
     The control sections  18  to  20  derive control content from the control signal respectively according to different control systems and execute control of the derived content on the LED  9 . For example, if the control section  18  is the control section corresponding to T/Flecs and receives a rectified control signal, the control section  18  derives control content indicated by the received control signal according to rules of T/Flecs and instructs the control circuit  14  to reflect the derived control content. If the control section  19  is the control section corresponding to DALI and receives a rectified control signal, the control section  19  derives control content indicated by the received control signal according to rules of DALI and instructs the control circuit  14  to reflect the derived control content. If the control section  20  is the control section corresponding to PWM and receives a rectified control signal, the control section  20  derives control content indicated by the received control signal according to rules of PWM and instructs the control circuit  14  to reflect the derived control content. 
     Example of the Configuration of the Control Circuit  14   
     Referring back to  FIG. 2 , the control circuit  14  reflects the control content specified from the control signal by the microcomputer  13  on the LED  9 . For example, if the control circuit  14  receives control content such as lighting, extinction, a change of illuminance, or a change of a color of light of the LED  9 , the control circuit  14  reflects the control content on the LED  9  by controlling the power supply circuit  11  to reflect the received control content. 
     Example of a Procedure of Processing by the Luminaire  5   
     A flow of processing for specifying, from a control signal received by the luminaire  5 , a flow of processing for specifying a control system corresponding to the control signal is explained with reference to  FIG. 7 .  FIG. 7  is a flowchart for explaining a procedure of processing executed by the luminaire according to the first embodiment. As shown in  FIG. 7 , when the luminaire  5  receives a control signal, the luminaire  5  determines whether a signal waveform of the received control signal is present in both poles (step S 101 ). 
     If the signal waveform of the received control signal is present in both the poles (step S 101 : Yes), the luminaire  5  controls the LED  9  with T/Flecs (step S 102 ) and ends the processing. On the other hand, if the signal waveform of the received control signal is absent in both the poles (step S 101 : No), the luminaire  5  determines whether a cycle of the control signal is equal to or smaller than a predetermined threshold (step S 103 ). If the luminaire  5  determines that the cycle of the control signal is equal to or smaller than the predetermined threshold (step S 103 : Yes), the luminaire  5  controls the LED  9  with DALI (step S 104 ) and ends the processing. 
     On the other hand, if the luminaire  5  determines that the cycle of the control signal is larger than the predetermined threshold (step S 103 : No), the luminaire  5  determines whether the cycle of the control signal is fixed (step S 105 ). If the luminaire  5  determines that the cycle of the control signal is fixed (step S 105 : Yes), the luminaire  5  controls the LED  9  with PWM (step S 106 ) and ends the processing. On the other hand, if the luminaire  5  determines that the cycle of the control signal is not fixed (step S 105 : No), the luminaire  5  controls the LED  9  with DALI (step S 104 ) and ends the processing. 
     Effects of the First Embodiment 
     As explained above, the power-supply control section  10  includes the receiving section  16  configured to receive a control signal, the specifying section  17  configured to specify a control system corresponding to the control signal received by the receiving section  16 , and the control sections  18  to  20  configured to derive control indicated by the control signal according to the control system specified by the specifying section  17  and apply the derived control to a lighting device. Therefore, the power-supply control section  10  can be adapted to a plurality of kinds of control systems. 
     The power-supply control section  10  includes the rectifying section  15  configured to generate a first signal obtained by subjecting the control signal to full-wave rectification and a second signal obtained by subjecting the control signal to half-wave rectification. The receiving section  16  outputs one of the first signal and the second signal generated by the rectifying section  15  to the control sections  18  to  20 . Therefore, the power-supply control section  10  can rectify a double pole signal and a single pole signal using a single circuit. 
     The lighting system  1  includes the power-supply control section  10  and the host apparatus  2  that outputs a control signal for a lighting device to the power-supply control section  10 . The power-supply control section  10  includes the receiving section  16  configured to receive a control signal, the specifying section  17  configured to specify a control system corresponding to the control signal received by the receiving section  16 , and the control sections  18  to  20  configured to derive control indicated by the control signal according to the control system specified by the specifying section  17  and apply the derived control to a lighting device. Therefore, the lighting system  1  can perform control of the lighting device according to an arbitrary control system. 
     Other Embodiments 
     The lighting system  1  explained above may be implemented in various different forms other than the embodiment. Therefore, various modifications of the lighting system  1  are explained below. 
     First Modification of the Interface Circuit 
     The configuration example of the interface circuit  12  shown in  FIG. 5  is only an example. The interface circuit  12  may include other configuration examples. For example, the interface circuit  12  may subject respective pole sides of a control signal to half-wave rectification and output signals subjected to half-wave rectification to the microcomputer  13 .  FIG. 8  is a diagram for explaining a first modification of the interface circuit according to the first embodiment. For example, in the example shown in  FIG. 8 , as another configuration example of the interface circuit  12  and the rectifying section  15 , the configuration of an interface circuit  12   a  and a rectifying section  15   a  is shown. 
     For example, the rectifying section  15   a  includes respective pole sides of the control signal as the input #1 and the input #2 and includes the output #1 obtained by combining the input #1 and the output on the negative pole side and the output #2 obtained by combining the input #2 and the output on the negative pole side. If a double pole signal is input from the communication section  3 , the interface circuit  12   a  output a signal for enabling the microcomputer  13  to identify control content from each of the output #1 and output #2. If a single pole signal is input from the communication section  3 , the interface circuit  12   a  outputs the signal for enabling the microcomputer  13  to identify control content from the output #1 or the output #2 according to whether the single pole signal is a single pole signal on the positive pole side or a single pole signal on the negative pole side. 
     In such a case, if the interface circuit  12   a  receives a double pole signal, the receiving section  16  shown in  FIG. 6  receives rectified signals from both of the output #1 and the output #2. If the interface circuit  12   a  receives a single pole signal, the receiving section  16  receives a rectified signal from the output #1 or the output #2 according to a pole direction of the single pole signal. Therefore, the receiving section  16  only has to select a signal including a pulse out of the signal received from the output #1 and the signal received from the output #2. 
     If the signals on the output #1 side and the output #2 side are rectified signals, the specifying section  17  determines that the control signal is a double pole signal. If the signal on the output #1 side or the output #2 side is a rectified signal, the specifying section  17  determines that the control signal is a single pole signal. The specifying section  17  only has to specify a control method corresponding to the control signal by executing the processing explained above. 
     Second Modification of the Interface Circuit 
     The interface circuit  12  outputs a pair of the signal obtained by subjecting the control signal to full-wave rectification and the signal obtained by subjecting the control signal to half-wave rectification to the microcomputer  13 . However, embodiments are not limited to this. For example, the interface circuit  12  may select a signal more suitable for specifying control content out of the rectified signals and output only the selected signal to the microcomputer  13 . In this way, connections of the interface circuit  12  and the microcomputer  13  may be integrated as one system. 
       FIG. 9  is a diagram for explaining a second modification of the interface circuit according to the first embodiment. In the example shown in  FIG. 9 , an interface circuit  12   b  includes the rectifying section  15  same as the rectifying section  15  of the interface circuit  12 . The interface circuit  12   b  includes a rectifying circuit  21  configured to rectify a signal of the output #2 and a switch  22 . 
     The rectifying circuit  21  is a rectifying circuit configured to rectify a signal output from the output #2 of the rectifying section  15 . For example, if a signal is output from the output #2, the rectifying circuit  21  applies direct-current potential to the switch  22 . If a signal is not output from the output #1, the rectifying circuit  21  does not apply a voltage to the switch  22 . 
     The switch  22  is a switch configured to receive the output #1 and the output #2 as inputs and output one of the inputs to the microcomputer  13  according to an output of the rectifying circuit  21 . Specifically, if a direct-current voltage is applied from the rectifying circuit  21 , the switch  22  outputs, to the microcomputer  13 , a signal output from the output #2 included in the rectifying section  15 . If a direct-current voltage is not applied from the rectifying circuit  21 , the switch  22  outputs, to the microcomputer  13 , a signal output from the output #1 included in the rectifying section  15 . 
     According to such an operation, the interface circuit  12   b  can output, to the microcomputer  13 , a signal suitable for specifying control content among signals out the outputs included in the rectifying section  15 . As a result, the microcomputer  13  can perform the control of the LED  9  using the signal output by the interface circuit  12   b  without performing signal selection processing. If the luminaire  5  includes the interface circuit  12   b,  the microcomputer  13  only has to acquire a control signal directly from the communication section  3  and execute processing for specifying a control system using the acquired control signal. 
     As explained above, the interface circuit  12   b  output a signal more suitable for specifying a control system among signals obtained by rectifying the control signal. Therefore, the power-supply control section  10  including the interface circuit  12   b  can reduce a load of processing executed by the microcomputer  13 . 
     Third Modification of the Interface Circuit 
     The interface circuit  12   a  shown in  FIG. 8  outputs the two signals obtained by the rectifying section  15   a  subjecting the control signal to half-wave rectification concerning the respective poles. If the outputs of the rectifying section  15   a  are simply combined in order to integrate the signals output from the interface circuit  12   a  to the microcomputer  13  in one system, when a double pole signal is input to the interface circuit  12   a,  a direct-current voltage is output. Therefore, the interface circuit  12   a  may add a rising edge delay to the output #1 and the output #2 of the rectifying section  15   a,  integrate the output #1 and the output #2 added with the raising edge delay as one system, and output the signals to the microcomputer  13 . 
       FIG. 10  is a diagram for explaining a third modification of the interface circuit according to the first embodiment. As shown in  FIG. 10 , an interface circuit  12   c  includes the rectifying section  15   a,  a rising-edge delay circuit  23   a,  a rising-edge delay circuit  23   b,  and a combining section  24 . The rising-edge delay circuit  23   a  is a circuit configured to delay rising edge timing of a signal output from the output #1 of the rectifying section  15   a  and is, for example, a CR circuit configured to generate a time constant and delay a rising edge. The rising-edge delay circuit  23   b  is a circuit configured to delay rising edge timing of a signal output from the output #2 of the rectifying section  15   a  and is, for example, a CR circuit same as the rising-edge delay circuit  23   a . The combining section  24  combines the signals output by the rising-edge delay circuit  23   a  and  23   b  and outputs a combined signal to the microcomputer  13 . 
     Waveforms of signals output by the interface circuit  12   c  are explained with reference to  FIG. 11 .  FIG. 11  is a diagram showing waveforms generated by delaying a rising edge of a control signal subjected to half-wave rectification. In  FIG. 11 , waveforms of a control signal input to the rectifying section  15   a , the output #1, a signal output by the rising-edge delay circuit  23   a,  the output #2, a signal output by the rising-edge delay circuit  23   b,  and a signal output by the combining section  24  are shown. In the example shown in  FIG. 11 , ground potential is indicated by a dotted line and rising edge and falling edge timings of the signals are indicated by alternate long and short dash lines. 
     Among timings T1 to T8 shown in  FIG. 11 , the timings T1, T3, T5, and T7 are rising edge and falling edge timings of the control signal. The timings T2, T4, T6, and T8 correspond to the timings T1, T3, T5, and T7 delayed by the rising-edge delay circuits  23   a  and  23   b.    
     For example, in the example shown in  FIG. 11 , a control signal, which is a double pole signal, is input to the rectifying section  15   a.  The potential of the control signal input to the rectifying section  15   a  rises to “High” at the timing T1 and falls to “Low” at the timing T3. The potential of the control signal rises to “High” at the timing T5 and falls to “Low” at the timing T7. 
     If such a control signal is input, a signal obtained by rectifying a positive pole side of the control signal is output from the output #1. As a result, the rising-edge delay circuit  23   a  outputs the rectified signal, which is a signal, the potential of which rises to “High” at the timing T2, falls to “Low” at the timing T3, rises to “High” at the timing T6, and falls to “Low” at the timing T7. 
     A signal obtained by rectifying a negative pole side of the control signal is output from the output #2. Specifically, a signal, the potential of which falls to “Low” at the timing T1, rises to “High” at the timing T3, falls to “Low” at the timing T5, and rises to “High” at the timing T7, is output from the output #2. Therefore, the rising-edge delay circuit  23   b  outputs a signal, the potential of which falls to “Low” at the timing T1, rises to “High” at the timing T4, falls to “Low” at the timing T5, and rises to “High” at the timing T8. 
     As a result, the combining section  24  outputs a signal, the potential of which falls to “Low” at the timing T1, rises to “High” at the timing T2, falls to “Low” at the timing T3, and rises to “High” at the timing T4. The combining section  24  outputs a signal, the potential of which falls to “Low” at the timing T5, rises to “High” at the timing T6, falls to “Low” at the timing T7, and rises to “High” at the timing T8. 
     As explained above, if the output #1 and the output #2 of the rectifying section  15   a  are simply combined, the interface circuit  12   c  outputs a direct-current voltage. The microcomputer  13  cannot specify control content. However, the combining section  24  generates a signal obtained by delaying the rising edges of the signals of the output #1 and the output #2 and outputs the signal to the microcomputer  13 . As a result, the combining section  24  outputs a signal, the potential of which changes at timing when the potential of the control signal changes. Therefore, it is possible to output, in one system, a signal with which control content indicated by the control signal can be specified. 
     That is, in the signal output by the combining section  24 , the potential changes at timing same as timing when the potential of the control signal changes. Therefore, the microcomputer  13  can specify the frequency and the like of the control signal from the signal output by the combining section  24 . As a result, the microcomputer  13  can specify a control system and control content corresponding to the control signal from the signal output in the one system. For example, the microcomputer  13  only has to specify falling edge timing of the signal output by the interface circuit  12   c  and specify control content indicated by a control signal according to the specified falling edge timing. 
     Execution Timing of Specifying Processing 
     The power-supply control section  10  specifies, for example, during setting, a control system corresponding to the received control signal, derives control from the control signal according to the specified control system, and executes the derived control on the LED  9 . However, embodiments are not limited to this. 
     For example, the power-supply control section  10  may specify a control system corresponding to the received control signal at a predetermined time interval. Specifically, the receiving section  16  may output, at the predetermined time interval, signal received from the interface circuit  12  to the specifying section  17  by the predetermined time interval to update a control section at an output destination of the signals at the predetermined time interval. By executing such processing, even if the control system of the host apparatus  2  is changed, the power-supply control section  10  can appropriately perform control of the lighting device. 
     If noise occurs on a communication line between the host apparatus  2  and the power-supply control section  10 , since a waveform of the control signal changes, it is likely that the power-supply control section  10  cannot specify an appropriate control system. Therefore, the host apparatus  2  may output a system signal indicating a control system at predetermined timing such as setting time of the lighting system  1 . The luminaire  5  may perform control of content indicated by the control signal on the basis of rules of the control system indicated by the received system signal. 
     For example, at the setting time of the lighting system  1 , the host apparatus  2  outputs a system signal indicating that the control system is T/Flecs to the luminaire  5 . In such a case, the specifying section  17  included in the microcomputer  13  of the power-supply control section  10  may determine that the control system is T/Flecs and notify the receiving section  16  of the control section  18  that performs the control of the LED  9  according to rules of T/Flecs. By executing such processing, the lighting system  1  can prevent the power-supply control section  10  from erroneously specifying a control system. 
     Execution Mode of the Specifying Processing 
     The power-supply control section  10  may include a specifying mode for executing the specifying processing for a control system. For example, the receiving section  16  of the microcomputer  13  includes a normal operation mode and a specifying mode as operation modes. The normal operation mode is a mode for outputting a received signal to a control section designated by the specifying section  17 . The specifying mode is a mode for outputting the received signal to the specifying section  17 . 
     At the setting time of the luminaire  5 , for example, if the receiving section  16  receives a predetermined signal from the host apparatus  2  or if the receiving section  16  is instructed to operate in the specifying mode by a user via a button set in the luminaire  5  or a remote controller of the luminaire  5 , the receiving section  16  operates in the specifying mode and outputs the received signal to the specifying section  17 . If the receiving section  16  receives designation of a control section from the specifying section  17 , the receiving section  16  shifts to the normal operation mode. And the receiving section outputs a signal received thereafter to the designated control section. On the other hand, in a mode other than the specifying mode, the receiving section  16  does not output the received signal to the specifying section  17 . By executing such processing, the power-supply control section  10  is prevented from erroneously specifying a control system. Therefore, it is possible to appropriately control the lighting device. 
     Modifications of the Microcomputer  13   
     The microcomputer  13  specifies a control system corresponding to the received control signal using the received control signal. However, embodiments are not limited to this. For example, taking into account failsafe, the microcomputer  13  may include pin switches, zip switches, or the like and derive control indicated by the control signal according to a control system designated by the user operating the pin switches or the zip switches. 
       FIG. 12  is a diagram for explaining a first modification of the microcomputer according to the first embodiment. In the example shown in  FIG. 12 , a microcomputer  13   a  includes a plurality of pin switches  25   a  to  25   d.  Although not shown in  FIG. 12 , like the microcomputer  13  shown in  FIG. 2 , the microcomputer  13   a  is connected to the interface circuit  12  and the control circuit  14 . 
     The pin switches  25  and  25   b  are connected to the ground via a switch. It is possible to switch ON and OFF of the switch and switch potentials applied to the pin switches  25   a  and  25   b  to “High (a floating voltage)” or “Low (ground potential)”. The user switches the switch and changes a combination of potentials applied to the pin switches  25   a  and  25   b  to designate a type of a control system to the microcomputer  13   a.  As a result, the microcomputer  13   a  derives control content from a control signal according to the control system of the type designated by the user. Therefore, it is possible to appropriately control the lighting device. 
     An example of functional components of the microcomputer  13   a  is explained with reference to  FIG. 13 .  FIG. 13  is a diagram for explaining a modification of the functional components included in the microcomputer according to the first embodiment. As shown in  FIG. 13 , the microcomputer  13   a  includes a specifying section  17   a  connected to the pin switches  25   a  to  25   d.  The specifying section  17   a  specifies a type of a control system of the host apparatus  2  according to a combination of input sections applied with a voltage among the pin switches  25   a  to  25   d  and notifies the receiving section  16  of a control section corresponding to the specified control system. 
       FIG. 14  is a diagram showing an example of a correspondence between the pin switches and a control system to be specified. For example, if both the potentials of the pin switches  25   a  and  25   b  are “High”, like the specifying section  17 , the specifying section  17   a  specifies a control system from a waveform and the like of a control signal. If the potential of the pin switch  25   a  is “High” and the potential of the pin switch  25   b  is “Low”, the specifying section  17   a  specifies that the control system is T/Flecs. If the potential of the pin switch  25   a  is “Low” and the potential of the pin switch  25   b  is “High”, the specifying section  17   a  specifies that the control system is DALI. If both the potentials of the pin switches  25   a  and  25   b  are “Low”, the specifying section  17   a  specifies that the control system is PWM. 
     The microcomputer  13   a  may specify a control system according to a value of a voltage applied to the pin switches rather than a combination of the pin switches applied with a voltage. For example,  FIG. 15  is a diagram for explaining a second modification of the microcomputer according to the first embodiment. In the example shown in  FIG. 15 , fixed potential  27  is supplied to a microcomputer  13   b  via the pin switch  25   a  and a variable resistor  26 . A slider for changing a resistance value of the variable resistor  26  is set on the surface of the luminaire  5  to allow the user to easily operate the slider. The microcomputer  13   b  is connected to the ground via the pin switch  25   a  and a resistor  28 . 
     The user changes the resistance value of the variable resistor  26  to change potential applied to the pin switch  25   a  to designate a type of a control system to the microcomputer  13   b . As a result, even if there are many types of control systems to be specified, the microcomputer  13   b  does not have to increase the number of the pin switches  25   a  to  25   d.    
       FIG. 16  is a diagram showing an example of a correspondence between a value of a voltage applied to the pin switch and a control system to be specified. For example, if a value of a voltage applied to the pin switch  25   a  is “0 to 1.25 V”, like the specifying section  17 , the microcomputer  13   b  specifies a control system from a waveform and the like of a control signal. If the value of the voltage applied to the pin switch  25   a  is “1.26 to 2.5 V”, the microcomputer  13   b  specifies that the control system is T/Flecs. If the value of the voltage applied to the pin switch  25   a  is “2.6 to 3.75 V”, the microcomputer  13   b  specifies that the control system is DALI. If the value of the voltage applied to the pin switch  25   a  is “3.76 to 5 V”, the microcomputer  13   b  specifies that the control system is PWM. 
     As explained above, the microcomputers  13   a  and  13   b  include the plurality of pin switches  25   a  and  25   d  and specify a control system according to a value of a voltage applied to the pin switches  25   a  to  25   d  or a combination of the pin switches  25   a  to  25   d  applied with the voltage. Therefore, the power-supply control section  10  derives control from a control signal according to a control system of a type designated by the user and executes the derived control. Therefore, it is possible to prevent malfunction and appropriately perform control of the lighting device. 
     In the above explanation, the type of the control system specified according to the value of the voltage applied to the pin switches  25   a  to  25   d  or the combination of the pin switches  25   a  to  25   d  applied with the voltage is only an example. That is, the microcomputers  13   a  and  13   b  may specify a control system of an arbitrary type besides T/Flecs, DALI, and PWM. 
     While certain embodiments have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the inventions. Indeed, the novel embodiments described herein may be embodied in a variety of other forms; furthermore, various omissions, substitutions and changes in the form of the embodiments described herein may be made without departing from the spirit of the inventions. The accompanying claims and their equivalents are intended to cover such forms or modifications as would fall within the scope and spirit of the inventions.