Multichannel isolation power supply system and control method therefor

Abstract

The invention provides a multichannel isolation power supply system and a control method therefor. The method comprises the steps: carrying out the rectification filtering of an AC voltage, transformed by an AC transformer, of an AC power supply through a rectification filtering circuit; dividing a DC voltage into more than two isolated power supply branches after the DC voltage passes through a loose coupling transformer after rectification filtering; controlling the on / off of a primary side input current of the loose coupling transformer through a semiconductor switch unit connected between the rectification filtering circuit and the loose coupling transformer; and controlling the on / off of a switch of the semiconductor switch unit through employing a double-closed-loop control unit to carry out the voltage sampling of an auxiliary winding in the same structure with a secondary side output winding and the current sampling of the primary side input current. The system is small in size, is high in isolated voltage, is stable in output, and is easy to expand.

Description

technical field [0001] The invention relates to a multi-channel isolated power supply system and a control method thereof, in particular to a multi-channel isolated power supply system suitable for high-voltage IGBT switches and a control method thereof. Background technique [0002] With the continuous development of semiconductor technology, the volume of power semiconductor devices is getting smaller and smaller, the operation speed is getting faster and faster, and the cost is also decreasing. As a typical representative of semiconductor devices, power IGBT has the advantages of high voltage level, fast switching speed, and stable performance. In reactive power compensation, multiple IGBT switches are required to be connected in parallel with the compensation capacitor, and the working state of the compensation capacitor is switched through the action of the IGBT switch. A damped resonant voltage is generated on the product. However, the maximum withstand voltage of a ...

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Problems solved by technology

[0003] For IGBT switches of tens of kilovolts, it is often necessary to supply power to dozens of floating IGBT working units, especially when the isolation voltage is high and the number of working units is large, the traditional isolated power supply method is to provide each working unit with a Isolation transformer power supply, this power supply method is bulky and costly, and the final power supply design is often larger than the switch itself, which is not conducive to expansion

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