WO2021190671A1

WO2021190671A1 - Arc-extinguishing circuit

Info

Publication number: WO2021190671A1
Application number: PCT/CN2021/092435
Authority: WO
Inventors: 郭桥石
Original assignee: 郭桥石
Priority date: 2020-05-10
Filing date: 2021-05-08
Publication date: 2021-09-30
Also published as: CN115428108A

Abstract

Disclosed is an arc-extinguishing circuit, in particular, an arc-extinguishing circuit suitable for extinguishing an arc of a mechanical switch. A second mechanical switch (K2) that requires arc extinguishing is connected to a load (RL). A first mechanical switch (K1) and the second mechanical switch (K2) form a first series circuit. The first mechanical switch (K1) is connected in parallel to a unidirectional conducting device (D1). During a disconnection process between the first mechanical switch (K1) and the second mechanical switch (K2), a capacitor (C1) supplies power to the load (RL) by means of a first switch (S1), so as to extinguish an arc of the second mechanical switch (K2). The first mechanical switch (K1) and the second mechanical switch (K2) form a linkage structure. The arc-extinguishing circuit has the advantages of the circuit being simple and being convenient to implement.

Description

Arc extinguishing circuit

Technical field

The invention relates to an arc extinguishing circuit, particularly an arc extinguishing circuit suitable for rapid extinguishing of mechanical switches such as contactors (relays), and can also be used for other break points (such as the fusing of a fuse, between a plug and a socket) Breakpoints, wire breakpoints) arc extinguishing.

Background technique

At present, in new energy vehicles, rail transit, ships, automatic control and other electronic control systems, mechanical switches such as contactors (relays) are commonly used to frequently switch on and off the load. Due to the existence of breaking arcs in mechanical switches, especially direct current Because it has no zero point and the breaking arc is larger, it has the shortcoming of short electrical life of the mechanical switch. As the breaking voltage of the mechanical switch increases and the breaking current increases, its electrical life will be greatly reduced.

Summary of the invention

The purpose of the present invention is to solve the problem of short electrical life of mechanical switches in the existing electronic control system, and to provide an arc extinguishing circuit with simple circuit, convenient implementation, high capacitance utilization, and wide application range for extinguishing mechanical switches.

The purpose of the present invention is achieved through the following technical solutions:

An arc extinguishing circuit in which a second mechanical switch required for arc extinguishing is connected to a load, and is characterized in that: the first mechanical switch and the second mechanical switch form a first series circuit; the first mechanical switch is connected in parallel with a unidirectional conduction device; During the disconnection process of a mechanical switch and a second mechanical switch, the capacitor supplies power to the load through the first switch and is used for arc extinguishing of the second mechanical switch. The first mechanical switch and the second mechanical switch have a linkage structure.

An arc extinguishing circuit in which the unidirectional conduction device is a diode.

An arc extinguishing circuit, the first mechanical switch and the second mechanical switch adopt a common electromagnetic system.

An arc extinguishing circuit. A series circuit composed of a capacitor and a first switch is connected in parallel with the first series circuit, and the capacitor is reversely charged with voltage in advance.

An arc extinguishing circuit. A series circuit composed of a capacitor and a first switch is connected in parallel with a load, and the voltage charged by the capacitor is greater than the working voltage of the load.

An arc extinguishing circuit, the first switch is a semiconductor switch.

The invention is reasonable in design and has the advantages of simple circuit and convenient implementation.

Description of the drawings

Fig. 1 is one of the circuit schematic diagrams of the first embodiment of the arc extinguishing circuit of the present invention.

Fig. 2 is the second circuit schematic diagram of the first embodiment of the arc extinguishing circuit of the present invention.

Detailed ways

The first embodiment of the arc extinguishing circuit of the present invention:

As shown in Figure 1: an arc extinguishing circuit, the second mechanical switch K1 required to extinguish the arc is connected to the load RL, the first mechanical switch K1 and the second mechanical switch K2 form a first series circuit, and the first mechanical switch K1 is connected to the load RL. The unidirectional conduction device D1 (diode) is connected in parallel. During the breaking process of the first mechanical switch K1 and the second mechanical switch K2, the capacitor C1 supplies power to the load RL through the first switch S1 (semiconductor switch) for the second mechanical switch K2 to extinguish the arc , The first mechanical switch K1 and the second mechanical switch K2 are linked structures.

As shown in Figure 1, the series circuit composed of C1 and the first switch S1 is connected in parallel with the first series circuit, and the capacitor C1 is pre-charged with voltage in the reverse direction. It uses the voltage of the power supply BT to superimpose the voltage of the capacitor C1 to realize that the capacitor C1 is the load RL The voltage provided is greater than the operating voltage of the load RL.

As shown in FIG. 2, the series circuit formed by the capacitor C1 and the first switch S1 is connected in parallel with the load, and the voltage charged by the capacitor C1 is greater than the operating voltage of the load, so that the voltage provided by the capacitor C1 for the load RL is greater than the operating voltage of the load RL.

Working principle: During the breaking process of the first mechanical switch K1 and the second mechanical switch K2, the unidirectional conduction device D1 realizes the arc extinguishing of the first mechanical switch K1, and then the first switch S1 is turned on, and the capacitor C1 passes through the first switch S1 (semiconductor The switch) supplies power to the load RL, the voltage of the load RL increases rapidly, and the voltage between the contacts of the second mechanical switch K2 drops, or to zero voltage or reverse voltage, to realize the arc extinguishing of the second mechanical switch K2.

In the above embodiment, the unidirectional conduction device D1 is used to prevent the capacitor C1 from forming a loop in addition to the load RL, and fully improve the utilization rate of the charge or discharge of the capacitor C1. The first mechanical switch K1 and the second mechanical switch K2 adopt a common electromagnetic system, which has With the advantage of convenient implementation, the above embodiment can connect a current detection device to the first mechanical switch K1 or the unidirectional conduction device D1 to detect the disconnection of the first mechanical switch K1 in real time, and then control the first switch S1 to be turned on, which is beneficial to The conduction time of the unidirectional conduction device D1 is reduced, and the arcing time of the second mechanical switch K2 is reduced.

In summary, the present invention has the advantages of simple circuit and convenient implementation.

Claims

An arc extinguishing circuit, in which a second mechanical switch required for arc extinguishing is connected to a load, characterized in that: the first mechanical switch and the second mechanical switch form a first series circuit, and the first mechanical switch is connected to a unidirectional Connecting devices are connected in parallel. During the disconnection process of the first mechanical switch and the second mechanical switch, a capacitor supplies power to the load through the first switch for extinguishing the arc of the second mechanical switch, and the first The mechanical switch and the second mechanical switch have a linkage structure.
The arc extinguishing circuit according to claim 1, wherein the unidirectional conduction device is a diode.
The arc extinguishing circuit according to claim 1, wherein the first mechanical switch and the second mechanical switch adopt a common electromagnetic system.
The arc extinguishing circuit according to claim 1, wherein the series circuit formed by the capacitor and the first switch is connected in parallel with the first series circuit, and the capacitor is pre-charged with voltage in the reverse direction.
The arc extinguishing circuit according to claim 1, wherein the series circuit composed of the capacitor and the first switch is connected in parallel with the load, and the voltage charged by the capacitor is greater than the operating voltage of the load.
The arc extinguishing circuit according to claim 1, wherein the first switch is a semiconductor switch.
The arc extinguishing circuit according to claim 1, wherein the voltage provided by the capacitor to the load is greater than the working voltage of the load.
The arc extinguishing circuit according to claim 1, wherein the first mechanical switch or the unidirectional conduction device is connected to a current detection device for detecting the disconnection of the first mechanical switch, and when it is detected that the first mechanical switch is disconnected After being turned on, the first switch is controlled to be turned on.