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Arc-control device and arc-control method of direct-current mechanical switch

A technology of mechanical switch and arc extinguishing device, which is applied in electrical switches, electrical components, circuits, etc., can solve the problems of large size, inconvenient promotion and popularization of professional DC switches, and high price.

Inactive Publication Date: 2013-09-25
BEIJING LIANDONG TIANYI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the disconnection process of the mechanical switch, due to the existence of current, the switch contacts often generate arcs when they are separated, thereby reducing the service life of the mechanical switch; and, when the arc is severe, the switch contacts will be directly burned, and even the fire
Therefore, in order to reduce the arc phenomenon and improve the service life of the DC switch, in the prior art, people need to use a professional DC switch. However, the professional DC switch has the disadvantages of being expensive and bulky, which makes it inconvenient to popularize the professional DC switch.

Method used

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  • Arc-control device and arc-control method of direct-current mechanical switch
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  • Arc-control device and arc-control method of direct-current mechanical switch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: The DC mechanical switch is installed on the positive line side of the DC power supply line

[0036] When the DC mechanical switch is installed on the positive line side of the DC power supply line, the absorption circuit can be flexibly set. In this embodiment, four types of snubber circuits are listed.

[0037] The first absorption circuit:

[0038] like figure 1 As shown, the snubber circuit is capacitor C.

[0039] Its working principle is:

[0040] S1, when the DC mechanical switch K is in the closed state, the capacitor C is in a short-circuit state, and the DC current is output to the load after passing through the DC mechanical switch;

[0041] S2, when the DC mechanical switch K changes from the closed state to the open state, that is, during the process of the moving contact of the DC mechanical switch K gradually moving away from the static contact, the capacitor C changes from the short circuit state to the conduction state, and the DC mech...

Embodiment 2

[0053] Embodiment 2: The DC mechanical switch is installed on the negative line side of the DC power supply line

[0054] When the DC mechanical switch is installed on the negative line side of the DC power supply line, the snubber circuit can be flexibly set. In this embodiment, four types of snubber circuits are listed.

[0055] like Figure 5 As shown, the snubber circuit is capacitor C.

[0056] like Image 6 As shown, the absorbing circuit is a series RC circuit.

[0057] like Figure 7 and Figure 8 As shown, the absorption circuit is an RCD circuit; wherein, the RCD circuit includes a resistor R, a capacitor C and a diode D; the diode D is connected in series with the capacitor C, and the resistor R and the capacitor C are connected in parallel. specific, Figure 7 Among them, the current output end of the diode D is electrically connected to the input end of the resistor R and the capacitor C connected in parallel; Figure 8 Among them, after the resistor R and...

Embodiment 3

[0059] Embodiment 3: DC mechanical switches are respectively installed on the positive line side and the negative line side of the DC power supply line

[0060] Specifically, such as Figure 9 As shown, the DC mechanical switch includes a first DC mechanical switch and a second DC mechanical switch; the first DC mechanical switch is installed on the positive line side of the DC power supply line, and the second DC mechanical switch is installed on the negative line side of the DC power supply line .

[0061] A first absorption circuit is connected in parallel at both ends of the first DC mechanical switch, and a second absorption circuit is connected in parallel at both ends of the second DC mechanical switch. Among them, the structure of the first snubber circuit is the same as Figure 1 to Figure 4 The structure of the same, the structure of the second snubber circuit and Figure 5 to Figure 8 have the same structure and will not be described in detail here.

[0062] In ...

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Abstract

The invention provides an arc-control device and an arc-control method of a direct-current mechanical switch. The arc-control device comprises absorption circuits and the direct-current mechanical switch. The direct-current mechanical switch is mounted on a direct-current power supply line, and the absorption circuits are mounted to the two ends of the direct-current mechanical switch in parallel. Due to the fact that the absorption circuits are connected to the two ends of the conventional direct-current mechanical switch in parallel, the arc discharge phenomenon in the switch-off process of the direct-current mechanical switch can be avoided, and therefore the service life of the direct-current mechanical switch is prolonged.

Description

technical field [0001] The invention relates to an arc extinguishing device, in particular to an arc extinguishing device and an arc extinguishing method for a DC mechanical switch. Background technique [0002] DC power supplies, such as storage batteries, are widely used in various fields of people's production and life, and are used to supply power to loads such as various instruments, meters, and lighting equipment. [0003] In a DC power supply line composed of a DC power supply and a load, a mechanical switch is usually used to control the on-off of the power supply line. However, during the disconnection process of the mechanical switch, due to the existence of current, the switch contacts often generate arcs when they are separated, thereby reducing the service life of the mechanical switch; and, when the arc is severe, the switch contacts will be directly burned, and even fire. Therefore, in order to reduce the arc phenomenon and improve the service life of the DC...

Claims

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Application Information

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IPC IPC(8): H01H9/42
Inventor 唐建华
Owner BEIJING LIANDONG TIANYI TECH
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