Secondary inverter driving circuit for alternating current-direct current argon arc welding machine

A secondary inverter and drive circuit technology, applied in arc welding equipment, welding equipment, manufacturing tools, etc., can solve problems such as large switching loss, reduce duty cycle, and blow up machines, reduce loss and noise, and achieve protection. , the effect of preventing straight-through

Active Publication Date: 2016-07-06
SHANGHAI WTL WELDING EQUIP MFG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the upper and lower bridges of the AC inverter circuit are connected directly, the short circuit of the power supply will easily cause the machine to explode, and the switching loss of the IGBT for each AC commutation during AC welding is very large, which not only affects the efficiency of the welding machine but also reduces the duty cycle.

Method used

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  • Secondary inverter driving circuit for alternating current-direct current argon arc welding machine
  • Secondary inverter driving circuit for alternating current-direct current argon arc welding machine
  • Secondary inverter driving circuit for alternating current-direct current argon arc welding machine

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Embodiment Construction

[0028] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0029] Dead zone time (DeadZone) is a protection period set in order to prevent the upper and lower tubes of the H bridge or half H bridge from being turned on at the same time due to the switching speed problem during PWM output, so at this time, the upper and lower tubes will not have output. The principle of the present invention is that the dead time is determined by the delay circuit, which can prevent the upper and lower bridge arms of the IGBT from being directly connected. At the same time, the present invention reduces the given current to the minimum through the reverse judging pull-down circuit at each commutation of AC and DC, realizes commutation with small current, and effectively reduces noise and loss during commutation.

[0030] Such as figure 1 as shown, figure 1 It is a structural schematic diagram of the secondary invert...

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Abstract

The invention discloses a secondary inverter driving circuit for an alternating current-direct current argon arc welding machine. The secondary inverter driving circuit comprises a triangular wave generation circuit, a chopper circuit and a time-delay circuit, wherein the triangular wave generation circuit is used for generating a triangular wave; the chopper circuit is connected with the output end of the triangular wave generation circuit and used for outputting a square wave with an adjustable duty ratio; and the time-delay circuit is connected with the output end of the chopper circuit and used for generating two driving signals with dead time.

Description

technical field [0001] The invention relates to the technical field of AC and DC argon arc welding, in particular to a secondary inverter drive circuit for an AC and DC argon arc welding machine. Background technique [0002] Argon arc welding is tungsten inert gas shielded arc welding, which refers to the welding method that uses industrial tungsten or active tungsten as non-melting electrode and inert gas (argon) as shield. The arc starting method of argon arc welding adopts the arc starting method of high voltage breakdown. Firstly, a high frequency and high voltage is applied between the electrode needle (tungsten needle) and the workpiece to break down the argon gas to make it conductive, and then supply continuous current to ensure the stability of the arc. [0003] One of the most prone to failures of AC and DC argon arc welding machines is the direct connection of the upper and lower bridge arms of the AC inverter circuit IGBT (Insulated Gate Bipolar Transistor). ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/10
CPCB23K9/10B23K9/1006
Inventor 孙慧博
Owner SHANGHAI WTL WELDING EQUIP MFG CO LTD
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