CN210007385U - non-isolated power supply lightning protection circuit of LED lamp - Google Patents
non-isolated power supply lightning protection circuit of LED lamp Download PDFInfo
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- CN210007385U CN210007385U CN201921192867.6U CN201921192867U CN210007385U CN 210007385 U CN210007385 U CN 210007385U CN 201921192867 U CN201921192867 U CN 201921192867U CN 210007385 U CN210007385 U CN 210007385U
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- discharge tube
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Abstract
The utility model discloses a non-isolated power lightning protection circuit of LED lamps and lanterns, it includes pressure sensitive element, second pressure sensitive element, gas discharge tube and electric capacity, pressure sensitive element, second pressure sensitive element establish ties between live wire and zero line, gas discharge tube's end connect in pressure sensitive element and second pressure sensitive element's connected node, gas discharge tube's another end is connected with the ground wire, electric capacity with gas discharge tube is parallelly connected above-mentioned non-isolated power lightning protection circuit of LED lamps and lanterns, electric capacity are parallelly connected in the gas discharge tube both ends, and when suffering the thunderbolt, electric capacity plays the effect that reduces the residual pressure when thunderbolt surge, can great promotion non-isolated power's of LED lamps and lanterns lightning protection ability, can not make LED lamp pearl damaged by the thunderbolt, and when live wire and zero line exert withstand voltage to the ground wire, electric capacity and pressure sensitive element divide the pressure, can promote live wire and zero line to the ann's rule withstand voltage ability to the ground wire, satisfy the ann's of ann.
Description
Technical Field
The utility model relates to a power technical field especially relates to kinds of non-isolated power lightning protection circuit of LED lamps and lanterns.
Background
In the rapid development of LED illumination, the cost and the performance of a topological structure of an LED illumination power supply are also continuously optimized, from the prior high-cost half-bridge LLC topological structure to a medium-cost flyback QR topological structure, the current non-isolated topological structure scheme with low cost and high conversion efficiency commonly used in the LED industry is adopted, the non-isolated topological structure scheme generally adopts a piezoresistor and a gas discharge tube for lightning protection to prevent LED lamp beads from being necrotic due to lightning stroke, wherein the gas discharge tube is used for reducing the residual voltage flowing to a rear-stage circuit, and theoretically, the smaller the voltage parameter selection of the gas discharge tube is, the smaller the residual voltage flowing to the rear end is, and the stronger the lightning stroke protection capability is.
Therefore, it is necessary to design non-isolated power supply lightning protection circuits for LED lamps, which can improve lightning protection capability and meet the requirement of safety regulation and voltage resistance.
Disclosure of Invention
The utility model aims to solve the technical problem that kinds of can promote lightning protection ability, can satisfy the non-isolated power lightning protection circuit of LED lamps and lanterns of the withstand voltage requirement of ann's rule simultaneously.
In order to solve the technical problem, the utility model discloses a as follows technical scheme:
A lightning protection circuit of non-isolated power supply for LED lamp comprises a voltage-sensitive element, a second voltage-sensitive element, a gas discharge tube and a capacitor, wherein the voltage-sensitive element and the second voltage-sensitive element are connected in series between live wire and neutral wire, the end of the gas discharge tube is connected to the connection node of the voltage-sensitive element and the second voltage-sensitive element, the other end of the gas discharge tube is connected with ground wire, and the capacitor is connected in parallel with the gas discharge tube.
Preferably, the th pressure sensitive element and the second pressure sensitive element are piezoresistors.
Preferably, the th pressure sensitive element and the second pressure sensitive element are TVS tubes.
Preferably, the TVS tube is a bidirectional TVS tube.
Preferably, the gas discharge tube is a ceramic gas discharge tube.
The utility model has the advantages of: according to the non-isolated power supply lightning protection circuit of the LED lamp, the capacitors are connected in parallel to the two ends of the gas discharge tube, when the LED lamp is struck by lightning, the capacitors play a role in reducing residual voltage during lightning surge, the lightning protection capability of the non-isolated power supply of the LED lamp can be greatly improved, and LED lamp beads cannot be damaged by lightning; when the live wire and the zero line exert withstand voltage on the ground wire, the capacitor and the pressure-sensitive element divide voltage, so that the safety regulation withstand voltage capability of the live wire and the zero line on the ground wire can be improved, and the safety regulation withstand voltage requirement of the safety regulation withstand voltage standard can be met.
Drawings
Fig. 1 is a schematic circuit diagram of the non-isolated power lightning protection circuit of the LED lamp of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood by those skilled in the art, the present invention is further illustrated in with reference to the accompanying drawings and examples.
As shown in fig. 1, in the embodiments of the present invention, the non-isolated power lightning protection circuit of the LED lamp includes a varistor MOV1, a varistor MOV2, a ceramic gas discharge tube GDT1 and a capacitor C1, the varistor MOV1 and the varistor MOV2 are connected in series between the live line L and the neutral line N of the AC mains input end, the end of the ceramic gas discharge tube GDT1 is connected to the junction of the varistor MOV1 and the varistor MOV2, the other end of the ceramic gas discharge tube GDT1 is connected to the ground line G of the AC mains input end, and the capacitor C1 is connected in parallel to the ceramic gas discharge tube GDT 1.
The utility model discloses a non-theory of operation who keeps apart power lightning protection circuit of LED lamps and lanterns explains:
when lightning voltage enters an LED lamp power supply through a live wire L, a zero line N and a ground wire G of an AC commercial power input end, differential mode lightning surge plays a role in voltage clamping through a piezoresistor MOV1 and a piezoresistor MOV2 between the live wire L and the zero line N, the lightning voltage can be clamped, and differential mode lightning surge current is absorbed to protect devices behind the circuit. Meanwhile, common-mode lightning surge is clamped and absorbs common-mode lightning surge current through a voltage dependent resistor MOV1, a ceramic gas discharge tube GDT1 and a capacitor C1 between a live wire L and a ground wire G, and the voltage dependent resistor MOV2, the ceramic gas discharge tube GDT1 and the capacitor C1 between a zero wire N and the ground wire G, so that residual voltage flowing to the rear end is small, and LED lamp beads on the LED lamp are protected from being damaged by lightning.
When the live wire L and the zero wire N exert withstand voltage on the ground wire G, the capacitor C1, the piezoresistor MOV1 and the piezoresistor MOV2 perform voltage division, so that the safety regulation withstand voltage capability of the live wire L and the zero wire N on the ground wire G is higher, and the safety regulation withstand voltage standard requirement (2U +1000V) can be met.
The utility model has the advantages that:
1. the capacitor C1 is connected in parallel with two ends of the ceramic gas discharge tube GDT1, when the lamp is struck by lightning, the capacitor C1 plays a role in reducing residual voltage during lightning surge, the lightning protection capability of the non-isolated power supply of the LED lamp can be greatly improved, and the LED lamp bead cannot be damaged by lightning; when the live wire L and the zero line N exert withstand voltage on the ground wire G, the capacitor C1 and the piezoresistor divide voltage, so that the safety regulation withstand voltage capability of the live wire L and the zero line N on the ground wire G can be improved, and the safety regulation withstand voltage requirement of the safety regulation withstand voltage standard can be met.
2. The utility model discloses a there are two piezo-resistors, ceramic gas discharge tube and electric capacity, and electronic components is very few, circuit structure is simple, low cost.
It should be noted that, in other embodiments of the present invention, a TVS tube may be used to replace the varistor MOV1 and the varistor MOV2, and the TVS tube may be a bidirectional TVS tube or other type TVS tube, as long as the same functions of the varistor MOV1 and the varistor MOV2 can be realized.
The foregoing is considered as illustrative of the preferred embodiments of the invention and is not intended to limit the invention in any way. Various equivalent changes and modifications can be made on the basis of the above embodiments by those skilled in the art, and all equivalent changes and modifications within the scope of the claims should fall within the protection scope of the present invention.
Claims (5)
- The non-isolated power supply lightning protection circuit of the LED lamp is characterized by comprising a voltage-sensitive element, a second voltage-sensitive element, a gas discharge tube and a capacitor, wherein the voltage-sensitive element and the second voltage-sensitive element are connected in series between a live wire and a zero line, the end of the gas discharge tube is connected to a connection node of the voltage-sensitive element and the second voltage-sensitive element, the other end of the gas discharge tube is connected with a ground wire, and the capacitor is connected in parallel with the gas discharge tube.
- 2. The lightning protection circuit of the non-isolated power supply of the LED lamp as claimed in claim 1, wherein the th voltage-sensitive element and the second voltage-sensitive element are piezoresistors.
- 3. The lightning protection circuit of the non-isolated power supply of the LED lamp as claimed in claim 1, wherein the th voltage-sensitive element and the second voltage-sensitive element are TVS tubes.
- 4. The non-isolated power supply lightning protection circuit of an LED lamp of claim 3, wherein: the TVS tube is a bidirectional TVS tube.
- 5. The non-isolated power supply lightning protection circuit of any one of claims 1-4 and , wherein the gas discharge tube is a ceramic gas discharge tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921192867.6U CN210007385U (en) | 2019-07-26 | 2019-07-26 | non-isolated power supply lightning protection circuit of LED lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921192867.6U CN210007385U (en) | 2019-07-26 | 2019-07-26 | non-isolated power supply lightning protection circuit of LED lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210007385U true CN210007385U (en) | 2020-01-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921192867.6U Active CN210007385U (en) | 2019-07-26 | 2019-07-26 | non-isolated power supply lightning protection circuit of LED lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210007385U (en) |
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2019
- 2019-07-26 CN CN201921192867.6U patent/CN210007385U/en active Active
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