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High-frequency soft switching contravariant digital multifunctional welding machine

A soft switching and multi-functional technology, applied in welding equipment, auxiliary welding equipment, welding/cutting auxiliary equipment, etc., can solve the problem of large switching loss of power devices, achieve the effect of solving large switching loss and improving anti-interference ability

Inactive Publication Date: 2011-10-05
TAIYUAN NEBULA WELDING EQUIP
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  • Abstract
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Problems solved by technology

[0003] In order to solve the problem that the switching loss of the power device of the traditional digital multifunctional welding machine is relatively large, the present invention provides a high frequency soft switch inverter digital multifunctional welding machine

Method used

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  • High-frequency soft switching contravariant digital multifunctional welding machine
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  • High-frequency soft switching contravariant digital multifunctional welding machine

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Embodiment Construction

[0013] High-frequency soft-switching inverter digital multifunctional welding machine, its working circuit includes: an IGBT inverter rectifier bridge composed of two double IGBT power tube integrated blocks M1 and M2 connected and a control for controlling the conduction width of the IGBT inverter rectifier bridge circuit;

[0014] The input end of the IGBT inverter rectifier bridge is connected to the three-phase power supply through the three-phase bridge rectifier circuit BR1, the anti-interference protection circuit PCB6, and the circuit breaker DLQ. The output end of the IGBT inverter rectifier bridge is connected in parallel with the main transformer T1. There are three sets of full-bridge rectifier circuits D1, D2, D3 connected in parallel at the output terminal of the secondary pole of the transformer T1;

[0015] Described control circuit comprises DSP processor, is connected to the signal sampling circuit of the signal acquisition port of DSP processor, is connected...

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Abstract

The invention relates to a digital multifunctional welding machine, in particular to a high-frequency soft switching contravariant digital multifunctional welding machine. By the welding machine, the problem of larger switching loss of a power device of the conventional digital multifunctional welding machine can be solved. A working circuit of the high-frequency soft switching contravariant digital multifunctional welding machine comprises an insulated gate bipolar transistor (IGBT) contravariant rectification bridge formed by connecting two IGBT power tube integrated blocks, and a control circuit for controlling a conduction width of the IGBT contravariant rectification bridge, wherein the control circuit comprises an IGBT contravariant rectification bridge driving circuit connected with a pulse width modulation (PWM) signal output end of a digital signal processor (DSP); the IGBT contravariant rectification bridge driving circuit comprises a PWM chip UC3846, a double-D master-slave flip-flop and a dual monostable flip-flop. By the high-frequency soft switching contravariant digital multifunctional welding machine, high-frequency soft switching pulse width modulation is realized, and the problem of large switching loss of the power device of the conventional digital multifunctional welding machine is solved effectively.

Description

technical field [0001] The invention relates to a digital multifunctional welding machine, in particular to a high frequency soft switch inverter digital multifunctional welding machine. Background technique [0002] Traditional digital multifunctional welding machines generally use hard switching PWM (pulse width modulation) during use. Practice has shown that using hard switching for pulse width modulation will lead to large switching losses of welding power devices, that is, during the power conversion process , The electronic switch is in the working condition of high current or high voltage at the moment of turning on and off, which leads to poor reliability, low efficiency and serious electromagnetic interference of the electronic switch. Based on this, it is necessary to innovate the pulse width modulation method of the traditional digital multifunctional welding machine to solve the above-mentioned problems. Contents of the invention [0003] In order to solve the...

Claims

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Application Information

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IPC IPC(8): B23K37/00
Inventor 郭昊
Owner TAIYUAN NEBULA WELDING EQUIP
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