Power source cross power supply system

Abstract

The invention discloses a power source cross power supply system. According to the power source cross power supply system, a first power unit is adjacent to a second power unit; a first isolated step-down power source circuit is connected with the first power unit and a first power unit control circuit; the first isolated step-down power source circuit is connected with a second power unit control circuit through a switch unit; a second isolated step-down power source circuit is connected with the second power unit and a second power unit control circuit; the output end of the second isolated step-down power source circuit is connected with the first power unit control circuit through the switch unit; a voltage detection unit is connected with the first isolated step-down power source circuit, the second isolated step-down power source circuit and the switch unit respectively. The power source cross power supply system can achieve original power unit power supply or neighboring power unit power supply of power sources according to circuit needs.

Description

technical field [0001] The present invention relates to the technical field of power electronics, and more specifically, to a power supply cross power supply system. Background technique [0002] Most of the existing high-voltage and high-power equipment such as high-voltage inverters and SVGs use multiple power units in series, and each power unit is composed of a single H-bridge. Most of the equipment using power units running in series is used in medium and high voltage applications of 3KV to 35KV, which makes it difficult for the power units to control the power supply. If the power supply is supplied from the outside of the power unit, the isolation transformer needs to solve the problems of high withstand voltage and low partial discharge, which increases the cost of the power supply. Therefore, it is necessary to find a highly reliable and low-cost chain link control power supply solution. [0003] Most of the existing power units adopt the mode of taking power from...

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Problems solved by technology

[0005] The above-mentioned existing technology application and unit control power supply have the following disadvantages: in the first type of scheme, since the AC side has a fundamental wave of 50 Hz and a large harmonic component, the power-taking transformer has the problems of large heat generation and large volume. At the same time the cost is higher

Since the primary power supply is not exactly the same, it may cause that when the unit is working normally, one of the power supplies supplies power to the other two or three secondary side power supplies, and the output of the primary power supply board of other units is invalid. This power supply status is uncontrollable.

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