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Three-phase digital time division balance large power AC welding power source

A technology of welding power supply and AC power supply, which is applied in welding power supply, AC power input conversion to AC power output, high frequency current welding equipment, etc., can solve the problems of high cost and complex transformer structure.

Inactive Publication Date: 2010-07-21
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The structure of the transformer is complex and the cost is high

Method used

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  • Three-phase digital time division balance large power AC welding power source
  • Three-phase digital time division balance large power AC welding power source
  • Three-phase digital time division balance large power AC welding power source

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Embodiment Construction

[0017] figure 1 in, u a , u b , u c It is a three-phase AC input voltage, the first thyristor VTa1 and the second thyristor VTa2 form the A-phase controllable switch circuit, the third thyristor VTb1 and the fourth thyristor VTb2 form the B-phase controllable switch circuit, the fifth thyristor VTc1 and the sixth thyristor VTc2 To form a C-phase controllable switch circuit, they together form a three-phase controllable switch circuit. T is a three-phase to single-phase transformer, u a1 , u b1 , u c1 For the three primary voltages of the transformer T, the three voltages work in time sequence, u 2 It is the secondary output voltage of the transformer T. AC 380V passes through a three-phase controllable switch circuit composed of thyristors VTa1, VTa2, VTb1, VTb2, VTc1, VTc2 to generate a three-phase time-sharing balanced voltage u a1 , u b1 , u c1 , through the three-phase to single-phase transformer T, the three-phase is converted into a single-phase output voltage...

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PUM

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Abstract

The invention relates to a three-phase digital time-sharing balance alternating current welding power supply with high power, in particular to a three-phase to signal-phase welding power supply, which comprises a three-phase controlled switching circuit, a three-phase to single-phase transformer and a control circuit. The alternating current generates a three-phase time-sharing balance voltage through the three-phase controlled switching circuit composed of thyristors and outputs the voltage by transforming three phase into single phase through the three-phase to single-phase transformer and supplied to the alternating current load; under the control of the singlechip control circuit, the three-phase alternating current supplies power to a primary three-phase winding of a main transformeraccording to the time sequence, and the three-phase to single-phase process is realized through a three-phase synthesized transformer in the single-phase output sequentially synthesized by the secondary output three phase. The invention has the advantages of balanced three-phase input power, energy conservation and controllable single-phase output voltage.

Description

technical field [0001] The invention relates to a three-phase digital time-sharing balanced high-power AC welding power source, which is a three-phase-to-single-phase welding power source and has the advantages of three-phase balance, energy saving and controllable output voltage. Background technique [0002] Under the background of the three-phase power system, single-phase power equipment with small and medium power continues to appear. Single-phase AC high-power loads mainly use single-phase line voltage power supply, resulting in serious unbalance of three-phase voltage. In order to solve the three-phase unbalance problem, several technologies are mainly used at present: [0003] 1. The three-phase to single-phase balanced transformer can achieve the balanced transformation of three-phase to single-phase. The ideal state negative sequence current is zero, the power factor is 1, and it can also absorb some harmonics; cancel the electric phase separation and realize the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/14H02M5/257B23K9/10B23K11/24B23K13/08
Inventor 吴雷惠晶沈锦飞颜文旭
Owner JIANGNAN UNIV