CN114336557A

CN114336557A - Circuit for reducing lightning surge current

Info

Publication number: CN114336557A
Application number: CN202210005673.0A
Authority: CN
Inventors: 谢勇; 庞继浩; 黄关君; 叶修雷; 贾红叶
Original assignee: Dongke Semiconductor Anhui Co ltd
Current assignee: Dongke Semiconductor Anhui Co ltd
Priority date: 2022-01-05
Filing date: 2022-01-05
Publication date: 2022-04-12

Abstract

The invention discloses a circuit for reducing lightning surge current, which comprises a common-mode filter module, a bridge rectifier DB1 and a capacitor CE1, wherein the bridge rectifier DB1 and the capacitor CE1 are connected with the common-mode filter module, the bridge rectifier DB1 and the capacitor CE1 are connected in parallel and then are connected into a load, the common-mode filter module comprises a common-mode filter L1 and a coil arranged on the common-mode filter, a piezoresistor RV1 is connected between the common-mode filter L1 and alternating current, and the piezoresistor RV1 is connected with the coil.

Description

Circuit for reducing lightning surge current

Technical Field

The invention relates to a circuit for reducing lightning surge current, which is suitable for the technical field of lightning circuits.

Background

With the rise and large-scale use of electric power of various electric equipment, the switching transient state and the natural lightning transient state of an alternating current input end electric power system can generate stronger interference voltage, if the prior surge lightning strike circuit is improperly protected, the electric equipment can be damaged and failed, the corresponding lightning strike surge circuit is more and more important, the existing lightning strike protection circuit usually adopts hard clamping to directly absorb the voltage of the lightning strike, the current stress to be borne is very large, and the lightning strike protection circuit is easily damaged.

Disclosure of Invention

The invention aims to provide a circuit for reducing lightning surge current.

The technical solution for realizing the purpose of the invention is as follows: the utility model provides a circuit for reducing lightning surge current, includes common mode filter module, with bridge rectifier DB1 and the electric capacity CE1 that common mode filter module is connected, load is inserted to bridge rectifier DB1 and electric capacity CE1 parallelly connected back, common mode filter module includes common mode filter L1 to and set up the coil on common mode filter, be connected with piezo-resistor RV1 between common mode filter L1 and the alternating current, piezo-resistor RV1 and coil connection.

Furthermore, one end of the piezoresistor RV1 is connected between the common-mode filter L1 and the live wire, and the other end of the piezoresistor RV1 is connected with the zero line of the alternating current after being connected with the coil.

Furthermore, the common mode filter L1 is connected to a live wire of alternating current, and the joint of the common mode filter L1 and the bridge rectifier DB1 is sequentially connected with a piezoresistor RV1 and a zero line of alternating current connected to the rear of the coil.

Further, the filter also comprises a resistor FR1, wherein one end of the resistor FR1 is connected with a live wire of alternating current, and the other end of the resistor FR1 is connected to a common mode filter.

Further, the piezoresistor RV1 is a conventional piezoresistor with the model number of 14D 471.

Further, the model number of the bridge rectifier DB1 is GBL 410.

Further, the common mode filter L1 is a UU10.5 magnetic core.

Compared with the prior art, the invention has the remarkable advantages that: the coil is additionally arranged on the common mode filter and then the piezoresistor is connected, so that the lightning surge current of the whole circuit is greatly reduced, the coil and the piezoresistor are added, the cost is low, the lightning surge current stress is effectively reduced, the damage to the whole circuit is avoided, and the lightning surge resistance of the electric equipment is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments of the present invention or the prior art are briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic circuit diagram of embodiment 1 of the present invention;

fig. 2 is a schematic circuit structure diagram of embodiment 2 of the present invention.

Detailed Description

Example 1

With reference to fig. 1, a circuit for reducing lightning surge current includes a resistor FR1, a varistor RV1, a common mode filter module, a bridge rectifier, and a capacitor CE1, where the common mode filter module includes a common mode filter L1, and a coil disposed on the common mode filter, one end of the resistor FR1 is connected to a live line of alternating current, the other end of the resistor FR1 is connected to the common mode filter, and one end of the varistor RV1 is connected between the resistor FR1 and the common mode filter, the other end of the varistor RV1 is connected to a 5-pin and a 6-pin of the coil and then to a zero line of alternating current, an output end of the common mode filter L1 is connected to the bridge rectifier and the capacitor CE1, the bridge rectifier is connected in parallel to the capacitor CE1 and then to a load, where the varistor RV1 is a conventional varistor and is 14D471, the bridge rectifier 1 is GBL410, and the common mode filter L1 is UU 10.5.

Example 2

With reference to fig. 2, a circuit for reducing lightning surge current includes a resistor FR1, a varistor RV1, a common mode filter module, a bridge rectifier, and a capacitor CE1, where the common mode filter module includes a common mode filter L1, and a coil disposed on the common mode filter, one end of the resistor FR1 is connected to a live wire of alternating current, the other end of the resistor FR1 is connected to the common mode filter, a 4-pin of the common mode filter is connected to one end of the varistor RV1 and then connected to the bridge rectifier and the capacitor CE1, the bridge rectifier is connected to a load in parallel with the capacitor CE1, and the other end of the varistor RV1 is connected to a 5-pin and a 6-pin of the coil and then connected to a neutral wire of alternating current, where the varistor RV1 is a conventional varistor, the magnetic core is 14D471, the magnetic core of the bridge rectifier DB1 is GBL410, and the common mode filter L1 is UU 10.5.

According to the working principle, when 220V is normally input between ACL and ACN, a piezoresistor RV1 is not triggered, pins 5 and 6 of a coil are vacant, current directly passes through a resistor FR1 and then is directly loaded on a common mode filter, then the current passes through pins 1 and 4 of the common mode filter and is filtered by a bridge rectifier DB1 and a capacitor CE1 to provide electric energy for a load RL1, the load is then refluxed to pin 2 from pin 3, and magnetic fields generated by the current are mutually counteracted;

when 2KV lightning stroke is injected between ACL and ACN, a piezoresistor RV1 is broken by high voltage, a large amount of current passes through pins 5 and 6 of a coil, magnetic balance generated by a common mode filter (common mode inductance) is broken to become a differential mode filter (common mode inductance), the differential mode filter can form obstruction to sudden change current of the lightning stroke at the moment, the current passing is reduced, part of current is filtered by pins 1 and 4 of the common mode filter, a bridge rectifier and a capacitor CE1 to provide electric energy for a load RL1, the current flows back to pin 2 from pin 3 after the load, magnetic fields generated by the current are mutually counteracted, the current flowing through a test bridge rectifier DB1 is 68.8A at the moment (when the piezoresistor RV1 and the coil are not arranged, the current flowing through the test bridge rectifier DB1 is 280A), and the surge current is obviously reduced.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The circuit for reducing lightning surge current comprises a common-mode filter module, a bridge rectifier DB1 and a capacitor CE1, wherein the bridge rectifier DB1 is connected with the capacitor CE1 in parallel and then is connected with a load, the common-mode filter module comprises a common-mode filter L1 and a coil arranged on the common-mode filter, a piezoresistor RV1 is connected between the common-mode filter L1 and alternating current, and the piezoresistor RV1 is connected with the coil.

2. The circuit for reducing the lightning surge current according to claim 1, wherein one end of the piezoresistor RV1 is connected between the common mode filter L1 and the live wire, and the other end of the piezoresistor RV1 is connected with the coil and then connected with the neutral wire of the alternating current.

3. The circuit for reducing the lightning surge current according to claim 1, wherein the common mode filter L1 is connected to a live wire of alternating current, and a joint of the common mode filter L1 and the bridge rectifier DB1 is sequentially connected to a varistor RV1 and a neutral wire of alternating current connected to the back of a coil.

4. A circuit for reducing lightning surge current according to any of claims 2-3, characterized in that, it further comprises a resistor FR1, one end of said resistor FR1 is connected to the live line of AC, and the other end of resistor FR1 is connected to a common mode filter.

5. The circuit for reducing lightning surge current according to claim 1, wherein the piezoresistor RV1 is a conventional piezoresistor with the model number of 14D 471.

6. The circuit for reducing lightning surge current according to claim 1, wherein the model number of the bridge rectifier DB1 is GBL 410.

7. The circuit for reducing lightning surge current according to claim 1, wherein the common mode filter L1 is a UU10.5 magnetic core.