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Protective equipment for supplying power for input end of electric welding machine

A leakage protection device, power supply protection technology, applied in the direction of protection against overvoltage, etc., can solve the problems of varistor damage, welding machine device damage, welding machine failure, etc., to achieve reliable welding machine, reduce failure rate, Significant progress

Active Publication Date: 2010-09-15
AOTAI ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Varistors are protective components with transient voltage suppression functions, which can prevent device damage caused by static electricity, surges and other transient currents. Although varistors can absorb a large amount of electrical energy, they cannot withstand mA The continuous current above the level can only protect the instantaneous overvoltage of the narrow pulse. The welding machine with a single varistor cannot fundamentally adapt to the wide pulse or continuous overvoltage of the power supply voltage due to various reasons. In this case, it can not only Cause permanent damage to the varistor itself and easily cause damage to the internal components of the welding machine, resulting in failure of the welding machine, which is the deficiency of the existing technology

Method used

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  • Protective equipment for supplying power for input end of electric welding machine
  • Protective equipment for supplying power for input end of electric welding machine
  • Protective equipment for supplying power for input end of electric welding machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] figure 1 Among them, the power supply is a three-phase four-wire system, and each phase L1, L2, L3 and N of the power supply is connected to the leakage circuit breaker RCD through the switch K1, and one of the output phase lines of the leakage circuit breaker RCD is connected to the secondary side of the optocoupler U1 Pin 4, pin 3 on the secondary side of U1 is connected to resistor R1, and the other end of R1 is connected to one of the input phase lines of the leakage circuit breaker RCD, L2; pin 4 on the secondary side of the optocoupler U1 is connected to resistor R2, and the other end of R2 is connected to a capacitor C1, the other end of C1 is then connected to pin 3 of the secondary side of U1; the alternating current output by each phase of the RCD output end of the leakage circuit breaker enters the rectification circuit D1 for rectification, and the positive output of D1 is connected to one end of the varistor R4, and the other end of the varistor R4 is connec...

Embodiment 2

[0020] figure 2 Among them, the power supply is a three-phase three-wire system, and each phase L1, L2, L3 of the power supply is connected to the leakage circuit breaker RCD through the switch K1, and one of the output phase lines of the leakage circuit breaker RCD, L3, is connected to the secondary pin 4 of the optocoupler U1 , the No. 3 pin of the secondary side of U1 is connected to the resistor R1, and the other end of R1 is connected to one of the input phase lines of the leakage circuit breaker RCD, L2; the No. 4 pin of the secondary side of the optocoupler U1 is connected to the resistor R2, and the other end of R2 is connected to the capacitor C1, C1 The other end is connected to the No. 3 pin of the secondary side of U1; the alternating current output by each phase of the RCD output end of the leakage circuit breaker enters the rectification circuit D1 for rectification, and the positive output of D1 is connected to one end of the varistor R4, and the other end of th...

Embodiment 3

[0022] image 3 , the power supply is single-phase 220V, its L terminal is connected to the RCD input terminal of the leakage circuit breaker through the switch K1, and the N terminal is directly connected to the RCD input terminal of the leakage circuit breaker. The output terminal L of the leakage circuit breaker RCD is connected to the No. 4 pin of the secondary side of the optocoupler U1, the No. 3 pin of the secondary side of U1 is connected to the resistor R1, and the other end of R1 is connected to the neutral line N of the input terminal of the leakage circuit breaker RCD; the secondary side of the optocoupler U1 Pin 4 of RCD is connected to resistor R2, the other end of R2 is connected to capacitor C1, and the other end of C1 is connected to pin 3 of the secondary side of U1; the alternating current output from the output terminal L of the leakage circuit breaker RCD enters the rectifier circuit D1 for rectification, and the positive output terminal is connected to the...

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Abstract

The invention discloses an electric welding machine input end power supply protection device which adopts a piezoresistor matching with a residual current circuit breaker and a protection circuit composed of an optical couple and a resistance, when the welding machine results in power supply overvaltage condition because of some reasons, after ensuring the piezoresistor to operate, the optical couple is opened to generate leakage current promoting the residual current circuit breaker to operate, the feeding power supply is cutted off in time to make the welding machine obetain effective protection and make up the defect using only one piezoresistor to protect, the welding machine is more reliable and reduces failure rate.

Description

technical field [0001] The invention relates to a power supply protection circuit for an electric welding machine used for welding (especially for an unstable grid power supply electrode), in particular to a power supply protection device for an input end of an electric welding machine. Background technique [0002] In the prior art, most welding machines generally use a piezoresistor connected in parallel at the input end to protect the welding machine from overvoltage. Varistors are protective components with transient voltage suppression functions, which can prevent device damage caused by static electricity, surges and other transient currents. Although varistors can absorb a large amount of electrical energy, they cannot withstand mA The continuous current above the level can only protect the instantaneous overvoltage of the narrow pulse. The welding machine with a single varistor cannot fundamentally adapt to the wide pulse or continuous overvoltage of the power supply...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/20
Inventor 张光先李海涛常兴国赵磊
Owner AOTAI ELECTRIC
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