Lightning surge protection circuit and protector

Abstract

The invention relates to a lightning stroke surge protection circuit which is composed of a fuse, a rectifier bridge, a first piezoresistor, a second piezoresistor, a third piezoresistor, a fourth piezoresistor, a first resistor, a second resistor, a first solid discharge tube, a second solid discharge tube, a first safety resistor, a second safety resistor, a third safety resistor and a fourth safety resistor. The live wire, the fuse, the first piezoresistor, the first fixed discharge tube and the second fixed discharge tube are sequentially connected, the zero line, the second piezoresistor, the first resistor and the second resistor are sequentially connected, and two groups of fuse resistors are connected in parallel among the zero line, the live wire and the rectifier bridge. According to the invention, the voltage dependent resistor and the two solid discharge tubes are connected in series to absorb lightning stroke surge energy between the null line and the live wire and the ground wire, which is superior to the conventional mode of directly adding the voltage dependent resistor between the null line and the live wire and the ground wire, and can pass the conventional voltage withstand test of the null line and the live wire to the ground.

Description

Technical Field

[0001] The invention belongs to the field of lighting circuits, and in particular relates to a lightning surge protection circuit and a protector. Background Art

[0002] In many lighting applications, lamps, as a commonly used electrical appliance, also need to face the damage caused by lightning surges in the circuit. Traditional lightning surge protectors are often bulky and need to be installed outside the lamps, which is troublesome to install and needs to meet waterproof requirements, resulting in excessive costs. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies in the above-mentioned prior art, thereby providing a lightning surge protection circuit and a protector.

[0004] The technical solution adopted by the present invention to solve its technical problem is: A lightning surge protection circuit, comprising a fuse, a rectifier bridge, a varistor 1, a varistor 2, a varistor 3, a varistor 4, a resistor 1, a resistor 2, a solid discharge tube 1, a solid discharge tube 2, a fuse resistor 1, a fuse resistor 2, a fuse resistor 3, and a fuse resistor 4, wherein one end of the fuse is connected to a live wire, the other end of the fuse and one end of the fuse resistor are connected to one end of the varistor 1, the other end of the fuse resistor 1 and one end of the fuse resistor 2 are connected to one end of the varistor 3, the other end of the fuse resistor 3 and one end of the varistor 4 are connected Connect pin 1 of the rectifier bridge, the other end of varistor 4 and one end of fuse resistor 4 are connected to pin 3 of the rectifier bridge, the other end of fuse resistor 4 and one end of fuse resistor 3 are connected to the other end of varistor 3, the other end of fuse resistor 3 and one end of varistor 2 are connected to the neutral line, one end of resistor 1, the other end of varistor 1, and the other end of varistor 2 are connected to one end of fixed discharge tube 1, the other end of solid discharge tube 1 is connected to one end of fixed discharge tube 2, the other end of resistor 1 is connected to one end of resistor 2, and the other end of resistor 2 and the other end of solid discharge tube 2 are grounded respectively.

[0005] Preferably, the model of the solid discharge tube 1 and the solid discharge tube 2 is BIS-DS602-S.

[0006] A lightning surge protector comprises a carrier and a fuse fixed on the carrier, a rectifier bridge, a varistor 1, a varistor 2, a varistor 3, a varistor 4, a resistor 1, a resistor 2, a solid discharge tube 1, a solid discharge tube 2, a safety resistor 1, a safety resistor 2, a safety resistor 3, and a safety resistor 4, wherein one end of the safety resistor is connected to one end of the varistor 1, the other end of the safety resistor 1 and one end of the safety resistor 2 are connected to one end of the varistor 3, the other end of the safety resistor 3 and one end of the varistor 4 are connected to pin 1 of the rectifier bridge, the other end of the varistor 4 and one end of the safety resistor 4 are connected to pin 3 of the rectifier bridge, the other end of the safety resistor 4 and one end of the safety resistor 3 are connected to the other end of the varistor 3, the other end of the safety resistor 3 is connected to one end of the varistor 2, the one end of the resistor 1, the other end of the varistor 1, and the other end of the varistor 2 are connected to one end of the fixed discharge tube 1, the other end of the solid discharge tube 1 is connected to one end of the fixed discharge tube 2, and the other end of the resistor 1 is connected to one end of the resistor 2.

[0007] Compared with the prior art, the present invention has the following advantages and effects: 1) Use two-stage fuse resistors - varistors to weaken and absorb lightning surge energy. The resistance of the fuse resistor is selected according to the actual current of the lamp. The varistor uses 3025 package to reduce the size of the protector.

[0008] 2) Between the neutral and live wires, a varistor and two solid discharge tubes are connected in series to absorb the lightning surge energy between the neutral and live wires and the ground wire. This architecture is superior to the conventional method of directly adding a varistor between the neutral and live wires and the ground wire, and can pass the conventional neutral and live wire to ground withstand voltage test. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 Schematic diagram of a circuit of an embodiment of the invention.

[0010] The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application. DETAILED DESCRIPTION

[0011] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0012] Example

[0013] like Figure 1As shown, this embodiment is composed of a fuse F1, a rectifier bridge DB1, a varistor 1 RV1, a varistor 2 RV2, a varistor 3 RV3, a varistor 4 RV4, a resistor 1 R1, a resistor 2 R2, a solid discharge tube 1 B1, a solid discharge tube 2 B2, a fuse resistor 1 RF1, a fuse resistor 2 RF2, a fuse resistor 3 RF3, and a fuse resistor 4 RF4. One end of the fuse F1 is connected to the live wire, the other end of the fuse F1 and the end of the insurance resistor RF1 are connected to one end of the varistor RV1, the other end of the insurance resistor RF1 and one end of the insurance resistor RF2 are connected to one end of the varistor RV3, the other end of the insurance resistor RF3 and one end of the varistor RV4 are connected to the rectifier bridge DB11 pin, the other end of the varistor RV4 and one end of the insurance resistor RF4 are connected to the rectifier bridge DB13 pin, the other end of the insurance resistor RF4 and one end of the insurance resistor RF3 are connected to the other end of the varistor RV3, the other end of the insurance resistor RF3 and one end of the varistor RV2 are connected to the neutral line, one end of the resistor R1, the other end of the varistor RV1 and the other end of the varistor RV2 are connected to one end of the fixed discharge tube, the other end of the solid discharge tube B1 is connected to one end of the fixed discharge tube, the other end of the resistor R1 is connected to one end of the resistor R2, and the other end of the resistor R2 and the other end of the solid discharge tube B2 are grounded respectively. Specifically, after the common mode (neutral live wire to ground) surge energy enters, it is absorbed from the input end by two varistors, varistors 1 RV1 and varistors 2 RV2, and then discharged by two solid discharge tubes, solid discharge tube 1 B1 and solid discharge tube 2 B2, so that the common mode surge energy is effectively reduced, thereby protecting the lamp. The differential mode (between the neutral and live wires) surge energy is weakened at the first level through two fuse resistors, fuse resistor 3 RF3 and fuse resistor 4 RF4, and then absorbed at the first level through varistors 3 RV3, and then weakened at the second level through two fuse resistors, fuse resistor 1 RF1 and fuse resistor 2 RF2, and finally absorbed at the second level through varistors 4 RV4, so that the differential mode surge energy is effectively reduced, thereby protecting the lamp.

[0014] In this embodiment, the model of the solid discharge tube 1 B1 and the solid discharge tube 2 B2 is BIS-DS602-S.

[0015] A lightning surge protector comprises a carrier and a fuse fixed on the carrier, a rectifier bridge, a varistor 1, a varistor 2, a varistor 3, a varistor 4, a resistor 1, a resistor 2, a solid discharge tube 1, a solid discharge tube 2, a safety resistor 1, a safety resistor 2, a safety resistor 3, and a safety resistor 4. One end of the safety resistor is connected to one end of the varistor 1, the other end of the safety resistor 1 and one end of the safety resistor 2 are connected to one end of the varistor 3, the other end of the safety resistor 3 and one end of the varistor 4 are connected to pin 1 of the rectifier bridge, the other end of the varistor 4 and one end of the safety resistor 4 are connected to pin 3 of the rectifier bridge, the other end of the safety resistor 4 and one end of the safety resistor 3 are connected to the other end of the varistor 3, the other end of the safety resistor 3 is connected to one end of the varistor 2, one end of the resistor 1, the other end of the varistor 1, and the other end of the varistor 2 are connected to one end of the fixed discharge tube 1, the other end of the solid discharge tube 1 is connected to one end of the fixed discharge tube 2, and the other end of the resistor 1 is connected to one end of the resistor 2.

[0016] This embodiment does not provide a specific structural drawing of the above-mentioned protector. The connection method of this type of protector structure is a prior art, and this embodiment only provides its specific components.

[0017] When the protection circuit is actually used, all components can be packaged in SMD packaging, which can reduce the size and enable the protector carrying the protection circuit to be wrapped in a 20mm diameter heat shrink tube, thereby avoiding the problem of creepage distance between the protector and the metal of the lamp.

[0018] The above contents described in this specification are merely examples of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, as long as they do not deviate from the contents of the present specification or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. A lightning surge protection circuit, characterized in that: It consists of a fuse, a rectifier bridge, a varistor 1, a varistor 2, a varistor 3, a varistor 4, a resistor 1, a resistor 2, a solid discharge tube 1, a solid discharge tube 2, a fuse resistor 1, a fuse resistor 2, a fuse resistor 3, and a fuse resistor 4, wherein one end of the fuse is connected to the live wire, the other end of the fuse and one end of the fuse resistor are connected to one end of the varistor 1, the other end of the fuse resistor 1 and one end of the fuse resistor 2 are connected to one end of the varistor 3, the other end of the fuse resistor 3 and one end of the varistor 4 are connected to pin 1 of the rectifier bridge, the other end of the varistor 4 and one end of the fuse resistor 4 are connected to pin 3 of the rectifier bridge, the other end of the fuse resistor 4 and one end of the fuse resistor 3 are connected to the other end of the varistor 3, the other end of the fuse resistor 3 and one end of the varistor 2 are connected to the neutral line, one end of the resistor 1, the other end of the varistor 1, and the other end of the varistor 2 are connected to one end of the fixed discharge tube 1, the other end of the solid discharge tube 1 is connected to one end of the fixed discharge tube 2, the other end of the resistor 1 is connected to one end of the resistor 2, and the other end of the resistor 2 and the other end of the solid discharge tube 2 are grounded respectively.

2. The lightning surge protection circuit according to claim 1, characterized in that: The model of the solid discharge tube 1 and the solid discharge tube 2 is BIS-DS602-S.

3. A lightning surge protector, characterized in that: It includes a carrier and a fuse, a rectifier bridge, a varistor 1, a varistor 2, a varistor 3, a varistor 4, a resistor 1, a resistor 2, a solid discharge tube 1, a solid discharge tube 2, a fuse resistor 1, a fuse resistor 2, a fuse resistor 3, and a fuse resistor 4, one end of the fuse resistor is connected to the first end of the varistor 1, the other end of the fuse resistor 1 and the first end of the fuse resistor 2 are connected to the first end of the varistor 3, the other end of the fuse resistor 3 and the first end of the varistor 4 are connected to the first foot of the rectifier bridge, the other end of the varistor 4 and the first end of the fuse resistor 4 are connected to the third foot of the rectifier bridge, the other end of the fuse resistor 4 and the first end of the fuse resistor 3 are connected to the other end of the varistor 3, the other end of the fuse resistor 3 is connected to the first end of the varistor 2, the first end of the resistor 1, the other end of the varistor 1 and the other end of the varistor 2 are connected to the first end of the fixed discharge tube 1, the other end of the solid discharge tube 1 is connected to the first end of the fixed discharge tube 2, and the other end of the resistor 1 is connected to the first end of the resistor 2.

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