Patent Publication Number: US-11388793-B2

Title: Dimmable lighting apparatus

Description:
TECHNICAL FIELD 
     The present invention relates to a lighting apparatus, in particular to a dimmable lighting apparatus. 
     BACKGROUND 
     Led lighting is widely used in various industries, with advantages of long life and high efficiency. With the development of lighting technology and the increasing requirement for energy saving and environmental protection, the demand for a dimmable LED lamp is increasing. However, the dimming modules of the existing LED lamps are complex, requiring a plurality of electric components, which results in a relatively high cost. 
     SUMMARY 
     In view of the problems of the prior art, embodiments of the present invention provide an improved dimmable lighting apparatus to eliminate or at least alleviate at least a part of the deficiencies of the prior art. 
     In an exemplary embodiment of the present invention, a dimmable lighting apparatus is provided, comprising a light emitting circuit and a driving circuit coupled with the light emitting circuit. The driving circuit comprises a rectifier module, a filtering module coupled between the light emitting circuit and the rectifier module, a constant current module coupled between the filtering module and the light emitting circuit, and a dimming module. The dimming module is configured to receive a driving signal supplied to the light emitting circuit from the constant current module, and feed the driving signal back to the constant current module to adjust an output power of the constant current module. 
     In an exemplary embodiment of the present invention, the dimming module comprises a first voltage dividing unit, a filtering unit, a first voltage stabilizing unit and an amplifying unit, wherein the first voltage dividing unit is configured to collect the driving signal from the light emitting circuit, the filtering unit is configured to filter the collected driving signal, the amplifying unit is configured to amplify and feed back the filtered driving signal to the constant current module, and the first voltage stabilizing unit is configured to stabilize an input voltage of the amplifying unit. 
     In an exemplary embodiment of the present invention, the first voltage dividing unit comprises a first resistor, a second resistor, and a third resistor, and wherein a first terminal of the first resistor is coupled with the light emitting circuit, a second terminal of the first resistor is coupled with a first terminal of the second resistor, a second terminal of the second resistor is coupled with a first node, a first terminal of the third resistor is coupled with the first node, and the second terminal of the third resistor is coupled to the ground. The filtering unit comprises a fourth resistor, a first capacitor, and a second capacitor, and wherein a first terminal of the fourth resistor is coupled with the first node, a second terminal of the fourth resistor is coupled with a second node, a first terminal of the first capacitor is coupled with the first node, a second terminal of the first capacitor is coupled to the ground, a first terminal of the second capacitor is coupled with the second node, and a second terminal of the second capacitor is coupled to the ground. The first voltage stabilizing unit comprises a first Zener diode, and wherein a positive pole of the first Zener diode is coupled to the ground, and a negative pole of the first Zener diode is coupled with the second node. The amplifying unit comprises a first transistor, and wherein a base of the first transistor is coupled with the second node, a first pole of the first transistor is coupled to the ground, and a second pole of the first transistor is coupled with the constant current module. 
     In an exemplary embodiment of the present invention, the first voltage dividing unit comprises a fifth resistor, a sixth resistor, a seventh resistor, and an eighth resistor, and wherein a first terminal of the fifth resistor is coupled with the light emitting circuit, a second terminal of the fifth resistor is coupled with a first terminal of the sixth resistor, a second terminal of the sixth resistor is coupled with a third node, a first terminal of the seventh resistor is coupled with the third node, a second terminal of the seventh resistor is coupled with a fourth node, a first terminal of the eighth resistor is coupled with the fourth node, and a second terminal of the eighth resistor is coupled to the ground. The filtering unit comprises a third capacitor, and wherein a first terminal of the third capacitor is coupled with the fourth node, and a second terminal of the third capacitor is coupled to the ground. The first voltage stabilizing unit comprises a second Zener diode, and wherein a positive pole of the second Zener diode is coupled to the ground, and a negative pole of the second Zener diode is coupled with the third node. The amplifying unit comprises a second transistor, and wherein a base of the second transistor is coupled with the fourth node, a first pole of the second transistor is coupled to the ground, and a second pole of the second transistor is coupled with the constant current module. 
     In an exemplary embodiment of the present invention, the constant current module comprises a switch unit, a control unit coupled between the switch unit and the light emitting circuit, and an energy storage and freewheeling unit coupled between the control unit and the light emitting circuit. 
     In an exemplary embodiment of the present invention, the constant current module further comprises a second voltage dividing unit and a second voltage stabilizing unit, and wherein a first terminal of the second voltage dividing unit is coupled between the light emitting circuit and the energy storage and freewheeling unit, and a second terminal of the second voltage dividing unit is coupled with a first terminal of the second voltage stabilizing unit, and a second terminal of the second voltage stabilizing unit is coupled with the control unit. 
     In an exemplary embodiment of the present invention, the second voltage dividing unit comprises a ninth resistor, a tenth resistor, and an eleventh resistor, and wherein a first terminal of the ninth resistor is coupled between the light emitting circuit and the energy storage and freewheeling unit, a second terminal of the ninth resistor is coupled with a first terminal of the tenth resistor, a second terminal of the tenth resistor is coupled with a fifth node, a first terminal of the eleventh resistor is coupled with the fifth node, and the second terminal of the eleventh resistor is coupled with a sixth node. The second voltage stabilizing unit comprises a fourth capacitor, and wherein a first terminal of the fourth capacitor is coupled with the control unit, and a second terminal of the fourth capacitor is coupled with the fifth node. 
     In an exemplary embodiment of the present invention, the energy storage and freewheeling unit comprises a first diode, a first inductor, a fifth capacitor and a twelfth resistor, and wherein a positive pole of the first diode is coupled with the control unit, a negative pole of the first diode is coupled with the light emitting circuit, a first terminal of the first inductor is coupled with the control unit, a second terminal of the first inductor is coupled with the light emitting circuit, a first terminal of the fifth capacitor is coupled with the light emitting circuit, and a second terminal of the fifth capacitor is coupled with a first terminal of the twelfth resistor, and a second terminal of the twelfth resistor is coupled with the control unit. 
     In an exemplary embodiment of the present invention, the switch unit comprises a power MOS transistor, and the power MOS transistor is integrated in the control unit. 
     In an exemplary embodiment of the present invention, the rectifier module comprises a second diode, a third diode, a sixth capacitor, a seventh capacitor, a first adjustable resistor, and a bridge rectifying circuit unit, and wherein an input terminal of the second diode is coupled with a first terminal of the sixth capacitor, a first terminal of the first adjustable resistor, and an output terminal of the third diode, an output terminal of the second diode is coupled with an output terminal of the bridge rectifying circuit unit, an input terminal of the third diode is coupled to the ground, a second terminal of the sixth capacitor is coupled with a second terminal of the first adjustable resistor, a first terminal of the seventh capacitor, and a first input terminal of the bridge rectifying circuit unit, a second terminal of the seventh capacitor is coupled with a second input terminal of the bridge rectifying circuit unit, and a third input terminal of the bridge rectifying circuit unit is coupled to the ground. 
     In an exemplary embodiment of the present invention, the filtering module comprises a fourth diode, an eighth capacitor, a ninth capacitor, a thirteenth resistor, a second inductor, and a second adjustable resistor, and wherein an input terminal of the fourth diode is coupled with a first terminal of the eighth capacitor, an output terminal of the fourth diode is coupled with a first terminal of the second adjustable resistor, and a first terminal of the ninth capacitor, a second terminal of the eighth capacitor is coupled with a first terminal of the thirteenth resistor, and a first terminal of the second inductor, and a second terminal of the ninth capacitor is coupled with a second terminal of the second inductor, a second terminal of the thirteenth resistor, and a second terminal of the second adjustable resistor. 
     In an exemplary embodiment of the invention, the lighting apparatus comprises a live input terminal, a first neutral input terminal and a second neutral input terminal, and wherein the live input terminal and the first neutral input terminal are located on a first side of the lighting apparatus, and the second neutral input terminal is located on a second side of the lighting apparatus, the first side being opposite to the second side, and wherein the live input terminal is configured to cooperate with the first neutral input terminal to supply power to the lighting apparatus at single end and to cooperate with the second neutral input terminal to supply power to the lighting apparatus at two ends. 
     In an exemplary embodiment of the present invention, the driving circuit further comprises a mounted detection circuit coupled between the rectifier module and the filtering module, and wherein the mounted detection circuit is configured to detect an electric signal abnormality in the driving circuit in a case where the lighting apparatus is powered at two ends, and to turn off the driving circuit in response to the detected abnormal electric signal. 
     In an exemplary embodiment of the present invention, the lighting apparatus is adaptable to a Triac dimmer. 
     In an exemplary embodiment of the present invention, the lighting apparatus is an LED lamp. 
     In an exemplary embodiment of the present invention, the LED lamp comprises a lamp body and end caps located at two ends of the lamp body, and each of the end caps is provided with pins. 
     It should be understood that the above general description and the following detailed description are only exemplary and explanatory and are not intended to limit the invention in any way. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and further aspects of the invention will be described in more detail with reference to the accompanying drawings, which illustrate embodiments of the invention, but are not necessarily drawn to scale, and should be focused on the illustrated principles of the invention, in which, 
         FIG. 1  schematically illustrates a block diagram of a lighting apparatus according to an embodiment of the invention; 
         FIG. 2  schematically illustrates a block diagram of a dimming module according to an exemplary embodiment of the present invention; 
         FIG. 3A  schematically illustrates a circuit diagram of a dimming module according to an exemplary embodiment of the present invention; 
         FIG. 3B  schematically illustrates a circuit diagram of a dimming module according to another exemplary embodiment of the present invention; 
         FIG. 4  schematically illustrates a block diagram of a constant current module according to an exemplary embodiment of the present invention; 
         FIG. 5  schematically illustrates a block diagram of a constant current module according to another exemplary embodiment of the present invention; 
         FIG. 6  schematically illustrates a circuit diagram of a constant current module according to an exemplary embodiment of the present invention; 
         FIG. 7  schematically illustrates a circuit diagram of a rectifier module according to an exemplary embodiment of the present invention; 
         FIG. 8  schematically illustrates a circuit diagram of a filtering module according to an exemplary embodiment of the present invention; 
         FIG. 9  schematically illustrates a schematic view of a typical LED lamp; 
         FIG. 10  schematically illustrates a circuit diagram of a lighting apparatus according to an exemplary embodiment of the present invention. 
     
    
    
     The same reference numeral throughout the drawings refers to the same part. 
     Some embodiments of the present invention have been illustrated through the above drawings, which will be described in more detail hereinafter. These drawings and the related description are not intended to limit the scope of the inventive concept in any manner, but to explain the inventive concept for those skilled in the art with reference to specific embodiments. 
     DESCRIPTION OF THE EMBODIMENTS 
     In order to make the purposes, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the drawings of the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative labour fall within the scope of protection of the present invention. 
     With the development of society, it is necessary for the lighting apparatus to have the function of dimming. On the one hand, the application of the dimming technology will reduce energy consumption and save power for lighting. On the other hand, the application of the dimming technology will reduce the output power, which will significantly improve the working situation of the lighting apparatus and increase the service life of the lighting apparatus. 
     Among various dimming applications, Triac dimmer is a typical dimmer widely used in traditional incandescent lamps, halogen lamps, fluorescent lamps, and the like. Compared with traditional lamps, LED lamp has become the major illumination source because of its advantages such as high luminous efficiency, long life, energy saving and environmental protection. Therefore, there exists a demand in the art to replace traditional incandescent lamps, halogen lamps, fluorescent lamps and the like with LED lamps. Driven by this demand, it is necessary to provide an LED lighting apparatus that can be well adapted to the existing Triac dimmers. 
     As shown in  FIG. 9 , a typical LED lamp  900  generally includes a lamp body  901  and end caps  902  at two ends of the lamp body  901 . Each end cap  902  is provided with two pins  903  for connecting with an external power source. The lamp body  901  is provided with an LED light strip as a light emitting module and a driving circuit therein. The driving circuit converts the input external alternating current into a constant direct current and outputs the direct current to the LED light strip, so that the LED light bar emits light. 
     Typically, a dimmable LED lamp adapted to the Triac dimmer is provided with a dimming module for detecting the phase change of the bus bar, forming a dimming signal input to a constant current module, and dimming the LED lamp by changing the reference voltage. However, the circuit of such dimming module has a complex structure, resulting in a relatively high cost of the LED lamp. 
     In view of this, an embodiment of the present invention provides a dimmable lighting apparatus, which, in particular, may be an LED lamp adapted to a Triac dimmer. As shown in  FIG. 1 , the lighting apparatus  100  includes a light emitting circuit  110  and a driving circuit  120  coupled with the light emitting circuit  110 . The driving circuit  120  includes a rectifier module  121 , a filtering module  122  coupled between the rectifier module  121  and the light emitting circuit  110 , a constant current module  123  coupled between the filtering module  122  and the light emitting circuit  110 , and a dimming module  124 . The dimming module  124  is configured to receive a driving signal supplied to the light emitting circuit  110  from the constant current module  123  and feed the driving signal back to the constant current module  123  to adjust the output power of the constant current module  123 . 
     In such a configuration, by adding the dimming module, it is possible to provide a feedback channel to feed back the driving signal supplied to the light emitting circuit to the constant current module, without greatly changing the internal structure of the driving circuit, so that the constant current module can sense the dimming operation of the dimmer, and accordingly adjust the driving signal supplied to the light emitting circuit, thereby reducing the risk of flash of the light emitting circuit, especially the LED lamp. At the same time, the structure of the original driving circuit can be maximally retained, so that the design and manufacturing cost are also low. 
       FIG. 2  schematically illustrates a block diagram of the dimming module according to an exemplary embodiment of the present invention. As shown in  FIG. 2 , the dimming module  124  includes a first voltage dividing unit  1241 , a filtering unit  1242 , a first voltage stabilizing unit  1243 , and an amplifying unit  1244 . The first voltage dividing unit  1241  is configured to collect the driving signal from the light emitting circuit  110 , the filtering unit  1242  is configured to filter the collected driving signal, the amplifying unit  1244  is configured to amplify the filtered driving signal and feed back the same to the constant current module  123 , and the first voltage stabilizing unit  1243  is configured to stabilize the input voltage of the amplifying unit  1244 . 
     By using the dimming module of such configuration, it is possible to collect the working condition of the constant current module, and to provide the constant current module with amplified and stabilized driving signal, so as to realize a negative feedback regulation for the constant current module, so that the constant current module can receive effective feedback and thus effectively adjust and stabilize the driving signal supplied to the light emitting circuit. 
     In one exemplary embodiment, as shown in  FIG. 3A , the first voltage dividing unit includes a first resistor R 1 , a second resistor R 2  and a third resistor R 3 . A first terminal of the first resistor R 1  is coupled with the light emitting circuit  110 , a second terminal of the first resistor R 1  is coupled with a first terminal of the second resistor R 2 , a second terminal of the second resistor R 2  is coupled with a first node N 1 , a first terminal of the third resistor R 3  is coupled with the first node N 1 , and a second terminal of the third resistor R 3  is coupled to the ground. The filtering unit includes a fourth resistor R 4 , a first capacitor C 1  and a second capacitor C 2 , wherein a first terminal of the fourth resistor R 4  is coupled with the first node N 1 , a second terminal of the fourth resistor R 4  is coupled with a second node N 2 , a first terminal of the first capacitor C 1  is coupled with the first node N 1 , a second terminal of the first capacitor C 1  is coupled to the ground, a first terminal of the second capacitor C 2  is coupled with the second node N 2 , and a second terminal of the second capacitor C 2  is coupled to the ground. The first voltage stabilizing unit includes a first Zener diode RD 1 , a positive pole of the first Zener diode RD 1  is coupled to the ground, and a negative pole of the first Zener diode RD 1  is coupled with the second node N 2 . The amplifying unit includes a first transistor Q 1 , wherein the base of the first transistor Q 1  is coupled with the second node N 2 , a first pole of the first transistor Q 1  is coupled to the ground, and a second pole of the first transistor Q 1  is coupled with the constant current module  123 . 
     In such an embodiment, the first voltage dividing unit divides the voltage with the three resistors connected in series, and outputs the voltage at the node between the second resistor and the third resistor as a feedback signal, which has already being filtered, stabilized and amplified, to the constant current module. This voltage dividing circuit has a simple structure, with relatively few components, and the resistance of each resistor or the number of voltage dividing resistors is allowed to be adjusted according to the specific situation. 
     Alternatively, in another exemplary embodiment, as shown in  FIG. 3B , the first voltage dividing unit includes a fifth resistor R 5 , a sixth resistor R 6 , a seventh resistor R 7 , and an eighth resistor R 8 . A first terminal of the fifth resistor R 5  is coupled with the light emitting circuit  110 , a second terminal of the fifth resistor R 5  is coupled with a first terminal of the sixth resistor R 6 , a second terminal of the sixth resistor R 6  is coupled with a third node N 3 , a first terminal of the seventh resistor R 7  is coupled with the third node N 3 , a second terminal of the seventh resistor R 7  is coupled with a fourth node N 4 , a first terminal of the eighth resistor R 8  is coupled with the fourth node N 4 , and a second terminal of the eighth resistor R 8  is coupled to the ground. The filtering unit includes a third capacitor C 3 , wherein a first terminal of the third capacitor C 3  is coupled with the fourth node N 4 , and a second terminal of the third capacitor C 3  is coupled to the ground. The first voltage stabilizing unit includes a second Zener diode RD 2 , a positive pole of the second Zener diode RD 2  is coupled to the ground, and a negative pole of the second Zener diode RD 2  is coupled with the third node N 3 . The amplifying unit includes a second transistor Q 2 , wherein the base of the second transistor Q 2  is coupled with the fourth node N 4 , a first pole of the second transistor Q 2  is coupled to the ground, and a second pole of the second transistor Q 2  is coupled with the constant current module  123 . 
       FIG. 4  schematically illustrates a block diagram of a constant current module according to an exemplary embodiment of the present invention. As shown in  FIG. 4 , the constant current module  123  includes a switch unit  1231 , a control unit  1232  coupled between the switch unit  1231  and the light emitting circuit  110 , and an energy storage and freewheeling unit  1233  coupled between the control unit  1232  and the light emitting circuit  110 . 
     In another exemplary embodiment of the present invention, as shown in  FIG. 5 , the constant current module  123  further includes a second voltage dividing unit  1234  and a second voltage stabilizing unit  1235 . A first terminal of the second voltage dividing unit  1234  is coupled between the light emitting circuit  110  and the energy storage and freewheeling unit  1233 , and a second terminal of the second voltage dividing unit  1234  is coupled with a first terminal of the second voltage stabilizing unit  1235 , and a second terminal of the second voltage stabilizing unit  123  is coupled with the control unit  1232 . 
     Specifically, in an exemplary embodiment, as shown in  FIG. 6 , the second voltage dividing unit includes a ninth resistor R 9 , a tenth resistor R 10 , and an eleventh resistor R 11 . A first terminal of the ninth resistor R 9  is coupled between the light emitting circuit  110  and the energy storage and freewheeling unit  1233 , a second terminal of the ninth resistor R 9  is coupled with a first terminal of the tenth resistor R 10 , a second terminal of the tenth resistor R 10  is coupled with a fifth node N 5 , a first terminal of the eleventh resistor R 11  is coupled with the fifth node N 5 , and a second terminal of the eleventh resistor R 11  is coupled with a sixth node N 6 . The second voltage stabilizing unit includes a fourth capacitor C 4 , wherein a first terminal of the fourth capacitor C 4  is coupled with the control unit  1232 , and a second terminal of the fourth capacitor C 4  is coupled with the fifth node N 5 . 
     Further, as shown in  FIG. 6 , the energy storage and freewheeling unit may include a first diode D 1 , a first inductor L 1 , a fifth capacitor C 5 , and a twelfth resistor R 12 . A positive pole of the first diode D 1  is coupled with the control unit  1232 , and a negative pole of the first diode D 1  is coupled with the light emitting circuit  110 . A first terminal of the first inductor L 1  is coupled with the control unit  1232 , and a second terminal of the first inductor L 1  is coupled with the light emitting circuit  110 . A first terminal of the fifth capacitor C 5  is coupled with the light emitting circuit  110 , a second terminal of the fifth capacitor C 5  is coupled with a first terminal of the twelfth resistor R 12 , and a second terminal of the twelfth resistor R 12  is coupled with the control unit  1232 . 
     In an exemplary embodiment, the switch unit includes a power MOS transistor, and the power MOS transistor is optionally integrated in the control unit, thereby further improving the integration density of the entire driving circuit. 
       FIG. 7  schematically illustrates a circuit diagram of a rectifier module according to an exemplary embodiment of the present invention. As shown in  FIG. 7 , the rectifier module includes a second diode D 2 , a third diode D 3 , a sixth capacitor C 6 , a seventh capacitor C 7 , a first adjustable resistor RV 1 , and a bridge rectifying circuit unit DB. An input terminal of the second diode D 2  is coupled with a first terminal of the sixth capacitor C 6 , a first terminal of the first adjustable resistor RV 1 , and an output terminal of the third diode D 3 . An output terminal of the second diode D 2  is coupled with an output terminal of the bridge rectifying circuit unit DB, and an input terminal of the third diode D 3  is coupled to the ground. A second terminal of the sixth capacitor C 6  is coupled with a second terminal of the first adjustable resistor RV 1 , a first terminal of the seventh capacitor C 7 , and a first input terminal of the bridge rectifying circuit unit DB, a second terminal of the seventh capacitor C 7  is coupled with a second input terminal of the bridge rectifying circuit unit DB, and a third input terminal of the bridge rectifying circuit unit DB is coupled to the ground. As shown in  FIG. 7 , the bridge rectifying circuit unit DB is composed of four diodes. 
       FIG. 8  schematically illustrates a circuit diagram of a filtering module according to an exemplary embodiment of the present invention. As shown in  FIG. 8 , the filtering module includes a fourth diode D 4 , an eighth capacitor C 8 , a ninth capacitor C 9 , a thirteenth resistor R 13 , a second inductor L 2 , and a second adjustable resistor RV 2 . An input terminal of the fourth diode D 4  is coupled with a first terminal of the eighth capacitor C 8 , and an output terminal of the fourth diode D 4  is coupled with a first terminal of the second adjustable resistor RV 2  and a first terminal of the ninth capacitor C 9 . A second terminal of the eighth capacitor C 8  is coupled with a first terminal of the thirteenth resistor R 13  and a first terminal of the second inductor L 2 . A second terminal of the ninth capacitor C 9  is coupled with a second terminal of the second inductor L 2 , a second terminal of the thirteenth resistor R 13 , and a second terminal of the second adjustable resistor RV 2 . 
       FIG. 10  schematically illustrates an overall circuit diagram of a lighting apparatus according to an exemplary embodiment of the present invention, wherein portions that are the same as the foregoing embodiments will not be described here in detail, instead, the following description will be focused on the circuit arrangement that is not mentioned above. It should be noted that, the dimming module in the embodiment shown in  FIG. 10  is the same as that described in the embodiment shown in  FIG. 3B . However, as will be understood by those skilled in the art, the embodiment shown in  FIG. 3A  is also applicable to the lighting apparatus shown in  FIG. 10 . 
     Conventionally, an LED lighting apparatus is powered at single end, while a traditional fluorescent lamp is powered at two ends. In order to replace the fluorescent lamp with the LED lighting apparatus with as little circuit modification as possible, it is necessary to configure the LED lighting apparatus to be powered at two ends, so as to make the applications of the LED lighting apparatus more diverse. In view of this, in the embodiments of the present invention, the lighting apparatus, in particular, the LED lighting apparatus has three input terminals to meet the cases of single-ended power supply and double-ended power supply. 
     Specifically, as shown in  FIG. 10 , the lighting apparatus  1000  includes a live input terminal L, a first neutral input terminal N, and a second neutral input terminal N′. The live input terminal L and the first neutral input terminal N are located on a first side of the lighting apparatus  1000 , and the second neutral input terminal N′ is located on a second side of the lighting apparatus  1000 , wherein the first side is opposite to the second side. When the live input terminal L cooperates with the first neutral input terminal N, the lighting apparatus  1000  is powered at single end, and when the live input terminal L cooperates with the second neutral input terminal N′, the lighting apparatus  1000  is powered at two ends. 
     Based on the configuration of the above input terminals, the lighting apparatus can be freely powered at single end and two ends, thus greatly broadening the applications of the lighting apparatus. 
     The inventor of the present invention has recognized that when the lighting apparatus  1000  is in a condition of double-ended power supply, there is a risk of electric shock if an operator accidentally touches the input terminal. In order to solve this problem, an embodiment of the present invention provides a mounted detection circuit  130  between the rectifier module and the filtering module, that is capable of controlling the turning on or off of the driving circuit. The mounted detection circuit  130  is configured to detect an electric signal abnormality in the driving circuit  120  in the case where the lighting apparatus  1000  is powered at two ends, and to turn off the driving circuit  120  in response to the detected abnormal electric signal. Exemplarily,  FIG. 10  illustrates a circuit diagram of the mounted detection circuit  130  according to one embodiment of the present invention. However, as will be understood by those skilled in the art, other mounted detection circuit capable of preventing electric shock may also be employed. The mounted detection circuit  130  shown in  FIG. 10  is coupled between the rectifier module and the filtering module of the lighting apparatus through the connection terminals Vbus and Vbus. 
     As will be understood by those skilled in the art, the term “coupled” includes not only a direct connection between electrical elements, but also various connection modes between electrical elements, such as direct and indirect electrical connections and magnetic couplings. Those skilled in the art will also recognize that the present invention is in no way limited to the exemplary embodiments described above. Instead, many modifications and variations are possible within the scope of the appended claims. For example, further components may be added to or removed from the described apparatus. Further embodiments may be within the scope of the invention. In addition, in the claim, the word “comprising” does not exclude other elements or steps. The simple fact that certain steps are recited in mutually different dependent claims does not mean that these steps cannot be combined.