Abstract:
An intelligent energy-saving lamp includes a power source circuit, a main control circuit, a lighting circuit, and an infrared sensor circuit. The outgoing line of the power source circuit is connected to the incoming line of the main control circuit. The outgoing line of the main control circuit is connected to the incoming line of the lighting circuit. The infrared sensor circuit regulates the lighting circuit via the main control circuit. More specifically, the infrared sensor circuit senses the presence or absence of a person in the lighting area and instructs the main control circuit to regulate the lighting circuit accordingly, thereby saving energy. When people leave the lighting area, the lighting circuit enters the energy-saving mode and is prevented from working at maximum power. When people return, however, normal lighting resumes. Power consumption of the lamp in the energy-saving mode is only 20% of that for normal lighting.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims benefit of Chinese Application Serial No. 201020204351.1, filed May 18, 2010 entitled INTELLIGENT ENERGY-SAVING LAMP, the specification of which is incorporated herein by reference in its entirety. 
       TECHNICAL FIELD 
       [0002]    The present invention relates to the technical field of lighting equipment and, more particularly, to an intelligent energy-saving lamp capable of sensing the presence or absence of a person in the lighting area and adjusting the lighting intensity automatically and correspondingly. 
       BACKGROUND 
       [0003]    Energy-saving lamps such as LED lamps are increasingly popular and have been extensively used in our daily lives. However, most of the energy-saving lamps nowadays only feature low power consumption of the lamps themselves, but are not designed to save energy in response to variation in the environment. For instance, when there is no one in the lighting area and hence no need for lighting at full capacity, a conventional energy-saving lamp, once turned on, will still provide maximum lighting, which becomes a waste of energy. This is because the conventional energy-saving lamp is incapable of sensing the absence of people in the lighting area, let alone automatically dimming the light to further save electricity. 
       SUMMARY 
       [0004]    To solve the aforesaid problem of the conventional energy-saving lamp, namely failure to save energy according to actual needs, the present invention provides an energy-saving lamp whose luminosity is linearly variable and which is adjustable in response to the presence or absence of a person in the lighting area so as to save more energy. More specifically, when people leave the lighting area, the energy-saving lamp saves energy by reducing its luminosity automatically; and when people enter the lighting area again, the energy-saving lamp resumes maximum luminosity immediately for optimal lighting effect. 
         [0005]    The present invention provides an intelligent energy-saving lamp which includes a power source circuit, a main control circuit, a lighting circuit, and an infrared sensor circuit. The outgoing line of the power source circuit is connected to the incoming line of the main control circuit. The outgoing line of the main control circuit is connected to the incoming line of the lighting circuit. The infrared sensor circuit regulates the lighting circuit by way of the main control circuit. 
         [0006]    The live wire of the power source circuit is series-connected to a fuse cutout F 1  and then connected to a capacitor C 1  and an inductor L 1 . The other end of the capacitor C 1  is connected to a null wire, an inductor L 2 , and a resistor R 1 . The other end of the inductor L 1  is connected to pin  1  of a bridge rectifier D 1 . 
         [0007]    Pin  2  of the bridge rectifier D 1  is connected to the main control circuit or more specifically to capacitors C 2 , C 3  and the anodes of diodes D 2 , D 3 . The other end of the capacitor C 2  and the other end of the capacitor C 3  are connected to a resistor R 2  and an inductor L 3 . The other end of the diode D 2  is series-connected to an inductor L 4  while the other end of the inductor L 4  is series-connected to the anode of a diode D 6 . The cathode of the diode D 6  is connected to pin  2  of an inductive coupling element T 1 . The diode D 3  is connected to resistors R 3 , R 4 ; the anode of a polarized capacitor C 12 ; a capacitor C 4 ; and pin  1  of the inductive coupling element T 1 . The resistor R 3  is series-connected to a resistor R 14  and then connected to pin  3  of a chip IC 1 , wherein the model number of the chip IC 1  is IW3620. The other end of the capacitor C 4  is connected to the cathode of a diode D 4  while the anode of the diode D 4  is connected to pin  2  of the inductive coupling element T 1 . Pin  4  of the inductive coupling element T 1  is series-connected to the anode of a diode D 5  and then connected to the anode of a polarized capacitor C 13 ; resistors R 5 , R 6 , R 7 ; and a field-effect transistor Q 4 . The cathode of the polarized capacitor C 13  is connected to the resistor R 5  and then grounded. The other end of the resistor R 6  is connected to a photoresistor CDS 1  and the base of a triode Q 1 . The other end of the resistor R 7  is connected to another end of the field-effect transistor Q 4  and the collector of the triode Q 1 . The third end of the field-effect transistor Q 4  is connected to the anode of the lighting circuit by way of pin  3  of a connection port CON 2 . The lighting circuit is composed of a plurality of LEDs which are series-connected before being parallel-connected. In the infrared sensor circuit, an infrared detection head U 1  is connected to a resistor R 23 , a capacitor C 15 , and pin  2  of a chip IC 2 , wherein the model number of the chip IC 2  is CSC9803F. Pin  4  of the chip IC 2  is connected to the anode of a polarized capacitor C 18  while the cathode of the polarized capacitor C 18  is connected to the resistor R 23  and then the other end of the capacitor C 15  before being grounded. Pin  3  of the chip IC 2  is connected to resistors R 25 , R 30  and a capacitor C 22 . The other end of the resistor R 25  and the other end of the capacitor C 22  are connected to pin  1  of the chip IC 2  and the cathode of a polarized capacitor C 23 . The anode of the polarized capacitor C 23  is connected to a resistor R 31 , whose other end is connected to pin  14  of the chip IC 2 , a resistor R 32 , and a capacitor C 25 . The other end of the resistor R 32  and the other end of the capacitor C 25  are connected to pin  16  of the chip IC 2 . The other end of the resistor R 30  is connected to the anode of a polarized capacitor C 21 . The cathode of the polarized capacitor C 21  is grounded and is series-connected to a capacitor C 26  and then connected to pin  16  of the chip IC 2 . Pin  9  of the chip IC 2  is connected to the anode of a polarized capacitor C 17  and a resistor R 22 . The cathode of the polarized capacitor C 17  is connected to the other end of the resistor R 22  and then grounded. Pin  6  of the chip IC 2  is connected to a capacitor C 16  and a resistor R 24 . The other end of the capacitor C 16  is grounded while the other end of the resistor R 24  is connected to pin  1  of a connection port CON 1 . Pin  8  of the chip IC 2  is connected to a capacitor C 19  and a resistor R 26 , wherein the other end of the capacitor C 19  is grounded, and the other end of the resistor R 26  is connected to pin  1  of the connection port CON 1 . A polarized capacitor C 20  has an anode which is connected to pin  1  of the connection port CON 1  and a cathode which is grounded. Pin  5  of the chip IC 2  is connected to the cathode of the lighting circuit and pin  2  of the connection port CON 1 . Pin  11  of the chip IC 2  is connected to a resistor R 18  via pins  4  of the connection ports CON 1 , CON 2 . The other end of the resistor R 18  is connected to the base of a triode Q 2 . The collector of the triode Q 2  is series-connected to a resistor R 17  and then connected to pin  1  of the connection port CON 2 . The emitter of the triode Q 2  is connected to pin  1  of a photocoupler U 4 , wherein the model number of the photocoupler U 4  is PC817. Pin  2  of the photocoupler U 4  is grounded. Pin  3  of the photocoupler U 4  is connected to pin  2  of an inductive coupling element T 2 ; resistors R 13 , R 19 ; and capacitors C 7 , C 8 , C 9 , C 10 , C 11 . The other end of the capacitor C 7  and the other end of the resistor R 13  are connected to pin  4  of the chip IC 1 . The capacitor C 8  is connected to pin  3  of the chip IC 1 . The capacitor C 9  is connected to pin  8  of the chip IC 1  and a resistor R 15 , wherein the other end of the resistor R 15  is connected to the other end of the capacitor C 11  and the cathode of a diode D 7 . The anode of the diode D 7  is connected to a resistor R 16  and pin  1  of the inductive coupling element T 2 . Pin  4  of the photocoupler U 4  is series-connected to a resistor R 20  and then connected to the resistors R 16 , R 19 ; the other end of the capacitor C 10 ; and pin  2  of the chip IC 1 . Pin  5  of the chip IC 1  is connected to a capacitor C 6  and resistors R 8 , R 9 . The other end of the capacitor C 6  is connected to a resistor R 12  and pin  6  of the chip IC 1 . The other end of the resistor R 8  and the other end of the resistor R 9  are connected to a field-effect transistor Q 5 ; the other end of the resistor R 12 ; and a resistor R 10 . The other end of the resistor R 10  is connected to a resistor R 11  and another end of the field-effect transistor Q 5 . The other end of the resistor R 11  is connected to pin  7  of the chip IC 1 . The third end of the field-effect transistor Q 5  is connected to pin  2  of the inductive coupling element T 1 . Pin  4  of the inductive coupling element T 2  is connected to the anode of a diode D 9  and pin  3  of the inductive coupling element T 1 . Pin  3  of the inductive coupling element T 2  is connected to pin  2  of the connection port CON 2 . The cathode of the diode D 9  is connected to the anode of a polarized capacitor C 14  and a resistor R 21 . The other end of the resistor R 21  is connected to pin  1  of the connection port CON 2  and the cathode of a voltage stabilizer ZD 1 . The cathode of the polarized capacitor C 14  is grounded. 
         [0008]    In the present invention, an ordinary lighting circuit is additionally connected with an infrared sensor circuit for sensing the presence or absence of a person in the lighting area and performing corresponding adjustment to save energy. Thus, when there is no one in the lighting area, the lighting circuit enters the energy-saving mode; and when people enter the lighting area, normal lighting resumes, wherein power consumption in the energy-saving mode is only 20% of that for normal lighting. As the lighting circuit is prevented from emitting light at full capacity after people leave the lighting area, electricity is saved to the benefit of environmental protection. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0009]    The structure as well as the objects, technical features, and advantageous effects of the present invention will be best understood by referring to the following detailed description of an illustrative embodiment in conjunction with the accompanying drawings, in which: 
           [0010]      FIG. 1  is a block diagram of the present invention; and 
           [0011]      FIG. 2  is a circuit diagram of the present invention. 
       
    
    
     DETAILED DESCRIPTION 
       [0012]    Referring to  FIGS. 1 and 2 , the present invention includes a power source circuit  1 , a main control circuit  2 , a lighting circuit  4 , and an infrared sensor circuit  3 . The outgoing line of the power source circuit  1  is connected to the incoming line of the main control circuit  2 . The outgoing line of the main control circuit  2  is connected to the incoming line of the lighting circuit  4 . The infrared sensor circuit  3  regulates the lighting circuit  4  via the main control circuit  2 . 
         [0013]    The power source circuit  1  mainly includes a fuse cutout F 1  and a bridge rectifier D 1 . 
         [0014]    The main control circuit  2  mainly includes an inductive coupling element T 1 , a photoresistor CDS 1 , a triode Q 1 , and a field-effect transistor Q 4 . 
         [0015]    The lighting circuit  4  is composed of a plurality of LEDs which are series-connected and then parallel-connected. 
         [0016]    The infrared sensor circuit  3  mainly includes an infrared detection head U 1 , a chip IC 1  (IW3620), a triode Q 2 , a photocoupler U 4  (PC817), an inductive coupling element T 2 , a field-effect transistor Q 5 , a voltage stabilizer ZD 1 , and a chip IC 2  (CSC9803F). 
         [0017]    The live wire of the power source circuit  1  is series-connected to the fuse cutout F 1  and then connected to a capacitor C 1  and an inductor L 1 . The other end of the capacitor C 1  is connected to a null wire, an inductor L 2 , and a resistor R 1 . The other end of the inductor L 1  is connected to pin  1  of the bridge rectifier D 1 . 
         [0018]    Pin  2  of the bridge rectifier D 1  is connected to the main control circuit  2  or more specifically to capacitors C 2 , C 3  and the anodes of diodes D 2 , D 3 . The other end of the capacitor C 2  and the other end of the capacitor C 3  are connected to a resistor R 2  and an inductor L 3 . The other end of the diode D 2  is series-connected to an inductor L 4  while the other end of the inductor L 4  is series-connected to the anode of a diode D 6 . The cathode of the diode D 6  is connected to pin  2  of the inductive coupling element T 1 . The diode D 3  is connected to resistors R 3 , R 4 ; the anode of a polarized capacitor C 12 ; a capacitor C 4 ; and pin  1  of the inductive coupling element T 1 . The resistor R 3  is series-connected to a resistor R 14  and then connected to pin  3  of the chip IC 1 , wherein the model number of the chip IC 1  is IW3620. The other end of the capacitor C 4  is connected to the cathode of a diode D 4  while the anode of the diode D 4  is connected to pin  2  of the inductive coupling element T 1 . Pin  4  of the inductive coupling element T 1  is series-connected to the anode of a diode D 5  and then connected to the anode of a polarized capacitor C 13 ; resistors R 5 , R 6 , R 7 ; and the field-effect transistor Q 4 . The cathode of the polarized capacitor C 13  is connected to the resistor R 5  and then grounded. The other end of the resistor R 6  is connected to the photoresistor CDS 1  and the base of the triode Q 1 . The other end of the resistor R 7  is connected to another end of the field-effect transistor Q 4  and the collector of the triode Q 1 . The third end of the field-effect transistor Q 4  is connected to the anode of the lighting circuit  4  by way of pin  3  of a connection port CON 2 . The lighting circuit  4 , as mentioned earlier, is composed of a plurality of LEDs which are series-connected before being parallel-connected. 
         [0019]    In the infrared sensor circuit  3 , the infrared detection head U 1  is connected to a resistor R 23 , a capacitor C 15 , and pin  2  of the chip IC 2 , wherein the model number of the chip IC 2  is CSC9803F. Pin  4  of the chip IC 2  is connected to the anode of a polarized capacitor C 18  while the cathode of the polarized capacitor C 18  is connected to the resistor R 23  and then the other end of the capacitor C 15  before being grounded. Pin  3  of the chip IC 2  is connected to resistors R 25 , R 30  and a capacitor C 22 . The other end of the resistor R 25  and the other end of the capacitor C 22  are connected to pin  1  of the chip IC 2  and the cathode of a polarized capacitor C 23 . The anode of the polarized capacitor C 23  is connected to a resistor R 31 , whose other end is connected to pin  14  of the chip IC 2 , a resistor R 32 , and a capacitor C 25 . The other end of the resistor R 32  and the other end of the capacitor C 25  are connected to pin  16  of the chip IC 2 . The other end of the resistor R 30  is connected to the anode of a polarized capacitor C 21 . The cathode of the polarized capacitor C 21  is grounded and is series-connected to a capacitor C 26  and then connected to pin  16  of the chip IC 2 . Pin  9  of the chip IC 2  is connected to the anode of a polarized capacitor C 17  and a resistor R 22 . The cathode of the polarized capacitor C 17  is connected to the other end of the resistor R 22  and then grounded. Pin  6  of the chip IC 2  is connected to a capacitor C 16  and a resistor R 24 . The other end of the capacitor C 16  is grounded while the other end of the resistor R 24  is connected to pin  1  of a connection port CON 1 . Pin  8  of the chip IC 2  is connected to a capacitor C 19  and a resistor R 26 , wherein the other end of the capacitor C 19  is grounded, and the other end of the resistor R 26  is connected to pin  1  of the connection port CON 1 . A polarized capacitor C 20  has an anode which is connected to pin  1  of the connection port CON 1  and a cathode which is grounded. Pin  5  of the chip IC 2  is connected to the cathode of the lighting circuit  4  and pin  2  of the connection port CON 1 . Pin  11  of the chip IC 2  is connected to a resistor R 18  via pins  4  of the connection ports CON 1 , CON 2 . The other end of the resistor R 18  is connected to the base of the triode Q 2 . The collector of the triode Q 2  is series-connected to a resistor R 17  and then connected to pin  1  of the connection port CON 2 . The emitter of the triode Q 2  is connected to pin  1  of the photocoupler U 4 , wherein the model number of the photocoupler U 4  is PC817. Pin  2  of the photocoupler U 4  is grounded. Pin  3  of the photocoupler U 4  is connected to pin  2  of the inductive coupling element T 2 ; resistors R 13 , R 19 ; and capacitors C 7 , C 8 , C 9 , C 10 , C 11 . The other end of the capacitor C 7  and the other end of the resistor R 13  are connected to pin  4  of the chip IC 1 . The capacitor C 8  is connected to pin  3  of the chip IC 1 . The capacitor C 9  is connected to pin  8  of the chip IC 1  and a resistor R 15 , wherein the other end of the resistor R 15  is connected to the other end of the capacitor C 11  and the cathode of a diode D 7 . The anode of the diode D 7  is connected to a resistor R 16  and pin  1  of the inductive coupling element T 2 . Pin  4  of the photocoupler U 4  is series-connected to a resistor R 20  and then connected to the resistors R 16 , R 19 ; the other end of the capacitor C 10 ; and pin  2  of the chip IC 1 . Pin  5  of the chip IC 1  is connected to a capacitor C 6  and resistors R 8 , R 9 . The other end of the capacitor C 6  is connected to a resistor R 12  and pin  6  of the chip IC 1 . The other end of the resistor R 8  and the other end of the resistor R 9  are connected to the field-effect transistor Q 5 ; the other end of the resistor R 12 ; and a resistor R 10 . The other end of the resistor R 10  is connected to a resistor R 11  and another end of the field-effect transistor Q 5 . The other end of the resistor R 11  is connected to pin  7  of the chip IC 1 . The third end of the field-effect transistor Q 5  is connected to pin  2  of the inductive coupling element T 1 . Pin  4  of the inductive coupling element T 2  is connected to the anode of a diode D 9  and pin  3  of the inductive coupling element T 1 . Pin  3  of the inductive coupling element T 2  is connected to pin  2  of the connection port CON 2 . The cathode of the diode D 9  is connected to the anode of a polarized capacitor C 14  and a resistor R 21 . The other end of the resistor R 21  is connected to pin  1  of the connection port CON 2  and the cathode of the voltage stabilizer ZD 1 . The cathode of the polarized capacitor C 14  is grounded. 
         [0020]    The working principle of the present invention is stated as follows. When the illuminance of the photoresistor CDS 1  is greater than 10LX±5LX, as caused by the ambient lighting during the day, the resistance of the photoresistor CDS 1  is reduced, thereby cutting off the field-effect transistor Q 4  and bringing the lighting circuit  4  into the standby state, in which the lighting circuit  4  is powered but does not work. However, when the illuminance of the photoresistor CDS 1  becomes smaller than 10LX±5LX, as produced by the ambient lighting at night, the resistance of the photoresistor CDS 1  is increased. As a result, both the triode Q 1  and the field-effect transistor Q 4  are turned on, and the luminosity of lighting circuit  4  increases linearly. When the illuminance resulting from ambient lighting drops below 1LX, and the infrared detection head U 1  senses no human presence in the lighting area, pin  11  of the chip IC 2  outputs a low-level signal to the triode Q 2  such that the photocoupler U 4  is cut off. Because of that, the feedback signal is increased, thereby lowering the voltage output by pin  2  of the chip IC 2  and the current supplied to the lighting circuit  4 . Hence, the perceived brightness, or the luminous flux, of the LEDs is reduced, and the lighting circuit  4  enters the energy-saving mode to save energy. When the infrared detection head U 1  senses the presence of a person, the sensing signal is amplified by the chip IC 2  to produce a high-level signal, which is output to the triode Q 2  via pin  11  of the chip IC 2 . Consequently, the photocoupler U 4  is turned on to reduce the feedback signal and raise the output voltage from pin  2  of the chip IC 2 , thereby increasing the current to the lighting circuit  4  and the perceived brightness, or the luminous flux, of the LEDs. Thus, the lighting circuit  4  resumes normal lighting, which, however, lasts one minute only, for the infrared detection head U 1  detects the presence or absence of a person in the lighting area at a one-minute interval. In other words, the lighting circuit  4  will be automatically switched to the energy-saving mode again not more than one minute after the person leaves the range of surveillance. 
         [0021]    The embodiment described above serves only to demonstrate the best mode of carrying out the present invention but not to limit the scope of the present invention. A person of ordinary skill in the art who has reviewed the technical contents disclosed herein may alter or modify the foregoing embodiment without departing from the spirit of the present invention. Therefore, the scope of the present invention is defined only by the appended claims.