A lamp that resists electromagnetic radiation

Abstract

This utility model belongs to the field of lighting technology and discloses a lighting fixture with electromagnetic radiation resistance, including: a light source board, a live wire terminal, a neutral wire terminal, a ground wire terminal, and a surge protection device; the light source board includes: a substrate, a rectifier and filter circuit, a driver circuit, and a string of LED beads; the rectifier and filter circuit, the driver circuit, and the string of LED beads are soldered onto the substrate; the surge protection device is equipped with a surge protection circuit; the live wire terminal, the neutral wire terminal, and the ground wire terminal are respectively connected to the surge protection circuit; the live wire terminal and the neutral wire terminal are used to receive AC power from the outside and transmit the AC power to the rectifier and filter circuit through the surge protection circuit; the rectifier and filter circuit is used to convert the AC power into DC power; the driver circuit is used to convert the DC power into a driving current for driving the string of LED beads. This utility model, by setting up a surge protection circuit and utilizing the circuit structure of the surge protection circuit, reduces the surge effect of the mains power and reduces the electromagnetic radiation caused by surge fluctuations. This improves the stability of the entire lighting fixture.

Description

Technical Field

[0001] This utility model relates to the field of lighting technology, and in particular to a lighting fixture that resists electromagnetic radiation. Background Technology

[0002] Existing lighting fixtures are prone to flickering, and the light emitted by LED chips is easily affected by external interference. Furthermore, large external surges or strong electromagnetic radiation can significantly impact the driving circuitry of the entire fixture, leading to instability. Therefore, improving the electromagnetic radiation resistance of lighting fixtures is a pressing technical issue that requires research in the industry. Utility Model Content

[0003] The purpose of this utility model is to provide a lamp that resists electromagnetic radiation, so as to solve one or more technical problems existing in the prior art, or at least provide a beneficial option or create conditions.

[0004] The solution to the technical problem of this utility model is to provide an electromagnetic radiation resistant lamp, including: a light source board, a live wire terminal, a neutral wire terminal, a ground wire terminal, and a surge protection device;

[0005] The light source board includes: a substrate, a rectifier and filter circuit, a driver circuit, and a string of LED beads; the rectifier and filter circuit, the driver circuit, and the string of LED beads are soldered onto the substrate; the surge protection device is equipped with a surge protection circuit; the live wire, neutral wire, and ground wire are respectively connected to the surge protection circuit; the live wire and neutral wire are used to receive AC power from the outside and transmit the AC power to the rectifier and filter circuit through the surge protection circuit; the rectifier and filter circuit is used to convert the AC power into DC power; the driver circuit is used to convert the DC power into a driving current for driving the string of LED beads;

[0006] The surge protection circuit includes: a first varistor, a second varistor, a third varistor, a first resistor, a first X capacitor, a first Y capacitor, a second Y capacitor, a third Y capacitor, a Zener diode, and a first common-mode inductor;

[0007] The live wire is connected to one end of the first X capacitor, one end of the first varistor, one end of the third varistor, and the first input terminal of the first common-mode inductor, respectively. The neutral wire is connected to the other end of the first varistor, one end of the second varistor, the other end of the first X capacitor, and the second input terminal of the first common-mode inductor, respectively. The ground wire is connected to the anode of the Zener diode, one end of the first Y capacitor, one end of the second Y capacitor, and one end of the third Y capacitor, respectively. The cathode of the Zener diode is connected to the other end of the second varistor, one end of the first resistor, and the other end of the third varistor, respectively. The other end of the first resistor is connected to the other end of the first Y capacitor. The first output terminal of the first common-mode inductor is connected to the first input terminal of the rectifier filter circuit and the other end of the third Y capacitor, respectively. The second output terminal of the first common-mode inductor is connected to the second input terminal of the rectifier filter circuit and the other end of the second Y capacitor, respectively.

[0008] In a further preferred embodiment, the electromagnetic radiation-resistant lamp also includes a fuse, and the live wire L is connected to one end of the first X capacitor, one end of the first varistor, one end of the third varistor, and the first input terminal of the first common-mode inductor through the fuse.

[0009] In a further preferred embodiment, the substrate is provided with a light source area and a driving area, the driving area surrounding the light source area, and the LED string is soldered to the light source area; the rectifier filter circuit and the driving circuit are soldered in the driving area.

[0010] In a further preferred embodiment, the electromagnetic radiation-resistant lamp further includes a pre-protection circuit, wherein the surge protection circuit is connected to the rectifier and filter circuit through the pre-protection circuit.

[0011] In a further preferred embodiment, the pre-protection circuit includes: a second common-mode inductor, a second X capacitor, a second resistor, and a fourth varistor;

[0012] The first input terminal of the second common-mode inductor is connected to the first output terminal of the first common-mode inductor and the other end of the third Y capacitor, respectively; the second input terminal of the second common-mode inductor is connected to the second output terminal of the first common-mode inductor and the other end of the second Y capacitor, respectively.

[0013] The first output terminal of the second common-mode inductor is connected to one end of the second X capacitor, one end of the second resistor, one end of the fourth varistor, and the first input terminal of the rectifier filter circuit, respectively; the second output terminal of the second common-mode inductor is connected to the other end of the second X capacitor, the other end of the second resistor, the other end of the fourth varistor, and the second input terminal of the rectifier filter circuit, respectively.

[0014] In a further preferred embodiment, the rectifier filter circuit includes: a rectifier bridge, a first capacitor, a second capacitor, a first inductor, and a ground terminal;

[0015] The first input terminal of the rectifier bridge is connected to the first output terminal of the second common-mode inductor, one end of the second X capacitor, one end of the second resistor, and one end of the fourth varistor, respectively; the second input terminal of the rectifier bridge is connected to the second output terminal of the second common-mode inductor, the other end of the second X capacitor, the other end of the second resistor, and the other end of the fourth varistor, respectively.

[0016] The first output terminal of the rectifier bridge is connected to one end of the first inductor and one end of the first capacitor, respectively. The second output terminal of the rectifier bridge is connected to the other end of the first capacitor, one end of the second capacitor, and the ground terminal, respectively. The other end of the first inductor is connected to the other end of the second capacitor and the input node of the driving circuit, respectively.

[0017] In a further preferred embodiment, the driving circuit includes: a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an electrolytic capacitor, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a fourth Y capacitor, a first transistor, a second transistor, a voltage regulator chip, a driving chip, and a transformer;

[0018] The second pin of the driver chip is connected to one end of the eighth resistor, one end of the ninth resistor, one end of the seventh resistor, and one end of the third capacitor, respectively; the other end of the eighth resistor is connected to one end of the tenth resistor, one end of the third capacitor, one end of the fourth capacitor, and the cathode of the third diode, respectively; the other end of the tenth resistor is connected to the anode of the first diode, and the cathode of the first diode is connected to one end of the sixth resistor, the third pin of the voltage regulator chip, one end of the seventh capacitor, and the sixth pin of the driver chip, respectively.

[0019] The first pin of the voltage regulator chip is connected to one end of the fifth resistor. The other end of the fifth resistor is connected to the other end of the sixth resistor, one end of the main winding of the transformer, the anode of the fourth diode, one end of the fourth Y capacitor, one end of the first inductor, and one end of the second capacitor. The other end of the fourth Y capacitor is connected to the cathode of the fourth diode, one end of the fifth capacitor, the cathode of the fifth diode, the positive terminal of the electrolytic capacitor, one end of the fourth resistor, and the positive terminal of the LED string.

[0020] The other end of the fifth capacitor is connected to one end of the third resistor, and the other end of the third resistor is connected to the other end of the main winding of the transformer, the anode of the fifth diode, and the drain of the second transistor. The gate of the second transistor is connected to one end of the eleventh resistor and one end of the twelfth resistor. The other end of the eleventh resistor is connected to the cathode of the fifth diode and the emitter of the first transistor.

[0021] The anode of the fifth diode is connected to the base of the first transistor and the fifth pin of the driver chip, respectively; the source of the second transistor is connected to the other end of the twelfth resistor, one end of the thirteenth resistor, and the third pin of the driver chip, respectively.

[0022] The seventh pin of the driver chip is connected to one end of the thirteenth resistor, and the first pin of the driver chip is connected to one end of the sixth capacitor; the other end of the ninth resistor is connected to the anode of the second diode, and the cathode of the second diode is connected to the other end of the third capacitor, the other end of the fourth capacitor, and one end of the secondary winding of the transformer, respectively; the eighth pin of the driver chip is connected to one end of the fourth capacitor.

[0023] The other end of the secondary winding of the transformer, the anode of the third diode, the cathode of the electrolytic capacitor, the other end of the fourth resistor, the cathode of the LED string, the other end of the seventh resistor, the other end of the third capacitor, the other end of the fourth capacitor, the other end of the seventh capacitor, the second pin of the voltage regulator chip, the source of the first transistor, and the other end of the thirteenth resistor are respectively connected to the ground terminal.

[0024] In a further preferred embodiment, the LED string is composed of multiple LED light-emitting chips connected in series.

[0025] In a further preferred embodiment, the substrate is an aluminum substrate.

[0026] In a further preferred embodiment, the live wire, neutral wire, and ground wire are encapsulated in a plug.

[0027] The beneficial effects of this invention are: by incorporating an anti-surge circuit, this invention reduces the impact of mains power surges and lowers electromagnetic radiation caused by surge fluctuations, thereby improving the overall stability of the lighting fixture. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly explained below. Obviously, the described drawings are only a part of the embodiments of this utility model, and not all of them. Those skilled in the art can obtain other design schemes and drawings based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the circuit connection structure of an electromagnetic radiation resistant lamp.

[0030] Figure 2 This is a structural diagram of a lamp that resists electromagnetic radiation;

[0031] Figure 3 This is a schematic diagram of the light source board. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0033] It should be noted that although functional modules are divided in the system diagram and the logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the system or the order in the flowchart. The terms "first," "second," etc., in the specification, claims, and the aforementioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0034] refer to Figure 1 , Figure 2 and Figure 3 , Figure 1 This is a schematic diagram of the circuit connection structure of an electromagnetic radiation resistant lamp. Figure 2 This is a structural diagram of a lamp that resists electromagnetic radiation; Figure 3 This is a structural schematic diagram of the light source board 200.

[0035] The purpose of this invention is to improve the stability of the lamp by constructing a reasonable circuit structure to achieve resistance to electromagnetic radiation and surges.

[0036] To achieve this technical objective, this application discloses an electromagnetic radiation resistant lamp, comprising: a light source board 200, a live wire terminal L, a neutral wire terminal N, a ground wire terminal FG, and a surge protection device 100.

[0037] The live wire L, neutral wire N, and ground wire FG are encapsulated in the plug 300.

[0038] The light source board 200 includes: a substrate, a rectifier and filter circuit 130, a driving circuit, and a string of LED beads 400; the rectifier and filter circuit 130, the driving circuit, and the string of LED beads 400 are soldered onto the substrate.

[0039] The substrate serves to support the rectifier-filter circuit 130, the driver circuit, and the LED string 400. To reduce interference from the rectifier-filter circuit 130 and the driver circuit to the LED string 400, in some further embodiments, the substrate is provided with a light source region 201 and a driver region 202. The driver region 202 surrounds the light source region 201, and the LED string 400 is soldered to the light source region 201; the rectifier-filter circuit 130 and the driver circuit are soldered within the driver region 202. In some embodiments, the substrate is circular. The light source region 201 is located at the center of the substrate, and the driver region 202 is located on the periphery of the substrate, with the driver region 202 forming a ring shape.

[0040] The LED string 400 is composed of multiple LED light-emitting chips connected in series, and these light-emitting chips are laid out and soldered around the center point of the light source area 201.

[0041] The surge protection device 100 is equipped with a surge protection circuit 110; the live wire L, neutral wire N, and ground wire FG are respectively connected to the surge protection circuit 110; the live wire L and neutral wire N are used to obtain AC power transmitted from the outside and transmit the AC power to the rectifier and filter circuit 130 through the surge protection circuit 110; the rectifier and filter circuit 130 is used to convert the AC power into DC power; the drive circuit is used to convert the DC power into a drive current for driving the LED string 400.

[0042] The surge protection circuit 110 includes: a first varistor VR1, a second varistor VR2, a third varistor VR3, a first resistor R1, a first X capacitor CX1, a first Y capacitor CY1, a second Y capacitor CY2, a third Y capacitor CY3, a Zener diode ZD, and a first common-mode inductor T1.

[0043] The live wire L is connected to one end of the first X capacitor CX1, one end of the first varistor VR1, one end of the third varistor VR3, and the first input terminal of the first common-mode inductor T1. The neutral wire N is connected to the other end of the first varistor VR1, one end of the second varistor VR2, the other end of the first X capacitor CX1, and the second input terminal of the first common-mode inductor T1. The ground wire FG is connected to the anode of the Zener diode ZD, one end of the first Y capacitor CY1, one end of the second Y capacitor CY2, and one end of the third Y capacitor CY3.

[0044] The cathode of the Zener diode ZD is connected to the other end of the second varistor VR2, one end of the first resistor R1, and the other end of the third varistor VR3, respectively; the other end of the first resistor R1 is connected to the other end of the first Y capacitor CY1. The first output terminal of the first common-mode inductor T1 is connected to the first input terminal of the rectifier-filter circuit 130 and the other end of the third Y capacitor CY3, respectively; the second output terminal of the first common-mode inductor T1 is connected to the second input terminal of the rectifier-filter circuit 130 and the other end of the second Y capacitor CY2, respectively.

[0045] In practical operation, the surge protection circuit 110 limits the voltage variation between the live wire (L) and neutral wire (N) using a first varistor VR1, and limits the voltage variation between the neutral wire (N) and ground wire (FG) using a second varistor VR2. It also suppresses the common-mode current using a first common-mode inductor T1, and bypasses the ground wire (FG) through a first resistor R1, a first Y capacitor CY1, a second Y capacitor CY2, and a third Y capacitor CY3, thereby guiding the surge into the ground wire. This invention, by setting up the surge protection circuit 110 and utilizing its circuit structure, reduces the impact of mains power surges and lowers electromagnetic radiation caused by surge fluctuations, thus improving the overall stability of the lighting fixture.

[0046] To further protect the lighting fixture, in some specific embodiments, the electromagnetic radiation-resistant lighting fixture also includes a fuse FS1. The function of fuse FS1 is to limit the current in the live wire terminal L, preventing excessive current from burning out subsequent circuits and protecting the electronic components in those circuits. One end of fuse FS1 is connected to the live wire terminal L, and the other end of fuse FS1 is connected to one end of the first X capacitor CX1, one end of the first varistor VR1, one end of the third varistor VR3, and the first input terminal of the first common-mode inductor T1.

[0047] To further protect the lighting fixtures, a pre-protection circuit 120 is provided after the surge protection circuit 110. The surge protection circuit 110 is connected to the rectifier and filter circuit 130 through the pre-protection circuit 120.

[0048] The pre-protection circuit 120 includes: a second common-mode inductor T2, a second X capacitor CX2, a second resistor R2, and a fourth varistor VR4.

[0049] The first input terminal of the second common-mode inductor T2 is connected to the first output terminal of the first common-mode inductor T1 and the other end of the third Y capacitor CY3. The second input terminal of the second common-mode inductor T2 is connected to the second output terminal of the first common-mode inductor T1 and the other end of the second Y capacitor CY2. The first output terminal of the second common-mode inductor T2 is connected to one end of the second X capacitor CX2, one end of the second resistor R2, one end of the fourth varistor VR4, and the first input terminal of the rectifier-filter circuit 130. The second output terminal of the second common-mode inductor T2 is connected to the other end of the second X capacitor CX2, the other end of the second resistor R2, the other end of the fourth varistor VR4, and the second input terminal of the rectifier-filter circuit 130.

[0050] The rectifier and filter circuit 130 includes: a rectifier bridge DB1, a first capacitor C1, a second capacitor C2, a first inductor L1, and a ground terminal GND. The first input terminal of the rectifier bridge DB1 is connected to the first output terminal of the second common-mode inductor T2, one end of the second X capacitor CX2, one end of the second resistor R2, and one end of the fourth varistor VR4.

[0051] The second input terminal of the rectifier bridge DB1 is connected to the second output terminal of the second common-mode inductor T2, the other end of the second X capacitor CX2, the other end of the second resistor R2, and the other end of the fourth varistor VR4. The first output terminal of the rectifier bridge DB1 is connected to one end of the first inductor L1 and one end of the first capacitor C1. The second output terminal of the rectifier bridge DB1 is connected to the other end of the first capacitor C1, one end of the second capacitor C2, and the ground terminal GND. The other end of the first inductor L1 is connected to the other end of the second capacitor C2 and the input node Vbus of the drive circuit.

[0052] The driving circuit includes: a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an electrolytic capacitor C8, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, a fourth Y capacitor CY4, a first transistor Q1, a second transistor Q2, a voltage regulator chip U1, a driving chip U2, and a transformer T3. In some further specific embodiments, the voltage regulator chip U1 is model JW7021, and the driving chip U2 is model JW1606.

[0053] The second pin of the driver chip U2 is connected to one end of the eighth resistor R8, one end of the ninth resistor R9, one end of the seventh resistor R7, and one end of the third capacitor C3, respectively. The other end of the eighth resistor R8 is connected to one end of the tenth resistor R10, one end of the third capacitor C3, one end of the fourth capacitor C4, and the cathode of the third diode D3, respectively.

[0054] The other end of the tenth resistor R10 is connected to the anode of the first diode D1. The cathode of the first diode D1 is connected to one end of the sixth resistor R6, the third pin of the voltage regulator chip U1, one end of the seventh capacitor C7, and the sixth pin of the driver chip U2. The first pin of the voltage regulator chip U1 is connected to one end of the fifth resistor R5. The other end of the fifth resistor R5 is connected to the other end of the sixth resistor R6, one end of the main winding of the transformer T3, the anode of the fourth diode D4, one end of the fourth Y capacitor CY4, one end of the first inductor L1, and one end of the second capacitor C2.

[0055] The other end of the fourth Y capacitor CY4 is connected to the cathode of the fourth diode D4, one end of the fifth capacitor C5, the cathode of the fifth diode D5, the positive terminal of the electrolytic capacitor C8, one end of the fourth resistor R4, and the positive terminal of the LED string 400. The other end of the fifth capacitor C5 is connected to one end of the third resistor R3, and the other end of the third resistor R3 is connected to the other end of the main winding of the transformer T3, the anode of the fifth diode D5, and the drain of the second transistor Q2.

[0056] The gate of the second transistor Q2 is connected to one end of the eleventh resistor R11 and one end of the twelfth resistor R12, respectively; the other end of the eleventh resistor R11 is connected to the cathode of the fifth diode D5 and the emitter of the first transistor Q1, respectively. The anode of the fifth diode D5 is connected to the base of the first transistor Q1 and the fifth pin of the driver chip U2, respectively. The source of the second transistor Q2 is connected to the other end of the twelfth resistor R12, one end of the thirteenth resistor R13, and the third pin of the driver chip U2, respectively.

[0057] The seventh pin of the driver chip U2 is connected to one end of the thirteenth resistor R13, and the first pin of the driver chip U2 is connected to one end of the sixth capacitor C6. The other end of the ninth resistor R9 is connected to the anode of the second diode D2, and the cathode of the second diode D2 is connected to the other end of the third capacitor C3, the other end of the fourth capacitor C4, and one end of the secondary winding of the transformer T3. The eighth pin of the driver chip U2 is connected to one end of the fourth capacitor C4; the other end of the secondary winding of the transformer T3, the anode of the third diode D3, the cathode of the electrolytic capacitor C8, the other end of the fourth resistor R4, the cathode of the 400 LED string, the other end of the seventh resistor R7, the other end of the third capacitor C3, the other end of the fourth capacitor C4, the other end of the seventh capacitor C7, the second pin of the voltage regulator chip U1, the source of the first transistor Q1, and the other end of the thirteenth resistor R13 are all connected to the ground terminal GND.

[0058] To facilitate heat dissipation of the LED string 400, in some further specific embodiments, the substrate is an aluminum substrate.

[0059] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A lamp fixture resistant to electromagnetic radiation, characterized in that, include: Light source board, live wire terminal, neutral wire terminal, ground wire terminal, and surge protector; The light source board includes: a substrate, a rectifier and filter circuit, a driver circuit, and a string of LED beads; the rectifier and filter circuit, the driver circuit, and the string of LED beads are soldered onto the substrate; the surge protection device is equipped with a surge protection circuit; the live wire, neutral wire, and ground wire are respectively connected to the surge protection circuit; the live wire and neutral wire are used to receive AC power from the outside and transmit the AC power to the rectifier and filter circuit through the surge protection circuit; the rectifier and filter circuit is used to convert the AC power into DC power; the driver circuit is used to convert the DC power into a driving current for driving the string of LED beads; The surge protection circuit includes: a first varistor, a second varistor, a third varistor, a first resistor, a first X capacitor, a first Y capacitor, a second Y capacitor, a third Y capacitor, a Zener diode, and a first common-mode inductor; The live wire is connected to one end of the first X capacitor, one end of the first varistor, one end of the third varistor, and the first input terminal of the first common-mode inductor, respectively. The neutral wire is connected to the other end of the first varistor, one end of the second varistor, the other end of the first X capacitor, and the second input terminal of the first common-mode inductor, respectively. The ground wire is connected to the anode of the Zener diode, one end of the first Y capacitor, one end of the second Y capacitor, and one end of the third Y capacitor, respectively. The cathode of the Zener diode is connected to the other end of the second varistor, one end of the first resistor, and the other end of the third varistor, respectively. The other end of the first resistor is connected to the other end of the first Y capacitor. The first output terminal of the first common-mode inductor is connected to the first input terminal of the rectifier filter circuit and the other end of the third Y capacitor, respectively. The second output terminal of the first common-mode inductor is connected to the second input terminal of the rectifier filter circuit and the other end of the second Y capacitor, respectively.

2. The electromagnetic radiation resistant lamp according to claim 1, characterized in that, It also includes a fuse, and the live wire L is connected to one end of the first X capacitor, one end of the first varistor, one end of the third varistor, and the first input terminal of the first common mode inductor through the fuse.

3. The electromagnetic radiation resistant lamp according to claim 1, characterized in that, The substrate is provided with a light source area and a driving area, the driving area surrounding the light source area, and the LED string is soldered in the light source area; the rectifier filter circuit and the driving circuit are soldered in the driving area.

4. The electromagnetic radiation resistant lamp according to claim 1, characterized in that, Also includes: A pre-protection circuit is provided, wherein the surge protection circuit is connected to the rectifier and filter circuit.

5. A lamp fixture resistant to electromagnetic radiation according to claim 4, characterized in that, The pre-protection circuit includes: a second common-mode inductor, a second X capacitor, a second resistor, and a fourth varistor; The first input terminal of the second common-mode inductor is connected to the first output terminal of the first common-mode inductor and the other end of the third Y capacitor, respectively; the second input terminal of the second common-mode inductor is connected to the second output terminal of the first common-mode inductor and the other end of the second Y capacitor, respectively. The first output terminal of the second common-mode inductor is connected to one end of the second X capacitor, one end of the second resistor, one end of the fourth varistor, and the first input terminal of the rectifier filter circuit, respectively; the second output terminal of the second common-mode inductor is connected to the other end of the second X capacitor, the other end of the second resistor, the other end of the fourth varistor, and the second input terminal of the rectifier filter circuit, respectively.

6. A lamp fixture resistant to electromagnetic radiation according to claim 5, characterized in that, The rectifier and filter circuit includes: a rectifier bridge, a first capacitor, a second capacitor, a first inductor, and a ground terminal; The first input terminal of the rectifier bridge is connected to the first output terminal of the second common-mode inductor, one end of the second X capacitor, one end of the second resistor, and one end of the fourth varistor, respectively; the second input terminal of the rectifier bridge is connected to the second output terminal of the second common-mode inductor, the other end of the second X capacitor, the other end of the second resistor, and the other end of the fourth varistor, respectively. The first output terminal of the rectifier bridge is connected to one end of the first inductor and one end of the first capacitor, respectively. The second output terminal of the rectifier bridge is connected to the other end of the first capacitor, one end of the second capacitor, and the ground terminal, respectively. The other end of the first inductor is connected to the other end of the second capacitor and the input node of the driving circuit, respectively.

7. A lamp fixture resistant to electromagnetic radiation according to claim 6, characterized in that, The driving circuit includes: a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an electrolytic capacitor, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a fourth Y capacitor, a first transistor, a second transistor, a voltage regulator chip, a driving chip, and a transformer; The second pin of the driver chip is connected to one end of the eighth resistor, one end of the ninth resistor, one end of the seventh resistor, and one end of the third capacitor, respectively; the other end of the eighth resistor is connected to one end of the tenth resistor, one end of the third capacitor, one end of the fourth capacitor, and the cathode of the third diode, respectively; the other end of the tenth resistor is connected to the anode of the first diode, and the cathode of the first diode is connected to one end of the sixth resistor, the third pin of the voltage regulator chip, one end of the seventh capacitor, and the sixth pin of the driver chip, respectively. The first pin of the voltage regulator chip is connected to one end of the fifth resistor. The other end of the fifth resistor is connected to the other end of the sixth resistor, one end of the main winding of the transformer, the anode of the fourth diode, one end of the fourth Y capacitor, one end of the first inductor, and one end of the second capacitor. The other end of the fourth Y capacitor is connected to the cathode of the fourth diode, one end of the fifth capacitor, the cathode of the fifth diode, the positive terminal of the electrolytic capacitor, one end of the fourth resistor, and the positive terminal of the LED string. The other end of the fifth capacitor is connected to one end of the third resistor, and the other end of the third resistor is connected to the other end of the main winding of the transformer, the anode of the fifth diode, and the drain of the second transistor. The gate of the second transistor is connected to one end of the eleventh resistor and one end of the twelfth resistor. The other end of the eleventh resistor is connected to the cathode of the fifth diode and the emitter of the first transistor. The anode of the fifth diode is connected to the base of the first transistor and the fifth pin of the driver chip, respectively; the source of the second transistor is connected to the other end of the twelfth resistor, one end of the thirteenth resistor, and the third pin of the driver chip, respectively. The seventh pin of the driver chip is connected to one end of the thirteenth resistor, and the first pin of the driver chip is connected to one end of the sixth capacitor; the other end of the ninth resistor is connected to the anode of the second diode, and the cathode of the second diode is connected to the other end of the third capacitor, the other end of the fourth capacitor, and one end of the secondary winding of the transformer, respectively; the eighth pin of the driver chip is connected to one end of the fourth capacitor. The other end of the secondary winding of the transformer, the anode of the third diode, the cathode of the electrolytic capacitor, the other end of the fourth resistor, the cathode of the LED string, the other end of the seventh resistor, the other end of the third capacitor, the other end of the fourth capacitor, the other end of the seventh capacitor, the second pin of the voltage regulator chip, the source of the first transistor, and the other end of the thirteenth resistor are respectively connected to the ground terminal.

8. A lamp fixture resistant to electromagnetic radiation according to claim 1, characterized in that, The LED string is composed of multiple LED light-emitting chips connected in series.

9. A lamp fixture resistant to electromagnetic radiation according to claim 1, characterized in that, The substrate is an aluminum substrate.

10. A lamp fixture resistant to electromagnetic radiation according to claim 1, characterized in that, The live wire, neutral wire, and ground wire are encapsulated in the plug.

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