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Bridge circuit, high voltage DC circuit breaker and control method thereof

A bridge circuit and branch circuit technology, which is applied in the direction of circuit devices, emergency protection circuit devices, electrical components, etc., can solve the problems of power semiconductor switching device damage, bridge arm short-circuit discharge, etc., to achieve series voltage equalization and less buffer circuits , the effect of large installation space

Active Publication Date: 2016-02-24
NR ELECTRIC CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the current breaking operation of the DC circuit breaker is completed, the capacitor of the full-bridge / half-bridge converter has a high voltage. Damaged power semiconductor switching device

Method used

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  • Bridge circuit, high voltage DC circuit breaker and control method thereof
  • Bridge circuit, high voltage DC circuit breaker and control method thereof

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Embodiment Construction

[0032] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0033] Such as figure 1 As shown, the present invention provides a bridge circuit including an H-bridge switch module and an RCD buffer module, wherein the H-bridge switch module includes 4 power semiconductor switching devices Q1-Q4, and each power semiconductor switching device is connected to one Anti-parallel diodes; Q1 and Q2 are connected in series in the same direction to form the first bridge arm, specifically connecting the cathode of Q1 to the anode of Q2, and Q3 and Q4 are connected in series in the same direction to form the second bridge arm, specifically connecting the cathode of Q3 with that of Q4 Connect the anode; connect the first and second bridge arms in parallel in the same direction, that is, connect the anode of Q1 to the anode of Q3, connect the cathodes of Q2 and Q4, and connect the midpoint of the first bridge arm (that...

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Abstract

The present invention discloses a bridge circuit which comprises an H-bridge switch module and an RCD buffer module. The H-bridge switch module comprises four power semiconductor switch devices. Each two power semiconductor switch devices are in same direction series connection to form a bridge arm. Two bridge arms are connected in parallel, and the middle points of the two bridge arms are taken as an input end and an output end. The RCD buffer module comprises a diode and a capacitor in mutual series connection, and two ends of the diode and the capacitor are in parallel connection with resistors respectively. The RCD buffer module is in parallel connection with the bridge arm formed by the series connection of each two power semiconductor switch devices. The number of the RCD buffer module included in the circuit is small, and the installation space is large. The invention also discloses a high voltage DC circuit breaker formed by the cascade connection of the bridge circuits, the high voltage DC circuit breaker has a reclosing function. The present invention also discloses a control method of the high voltage DC circuit breaker.

Description

Technical field [0001] The invention belongs to the technical field of circuit breakers, and particularly relates to a bridge circuit and a control method thereof, as well as a high voltage DC circuit breaker based on the bridge circuit and a control method thereof. Background technique [0002] With the development of multi-terminal DC transmission technology, high-voltage DC circuit breakers will become one of the key equipment to ensure the safe and stable operation of the system. [0003] Chinese Patent Publication No. CN102823121A discloses a switch module in a device for limiting the current of a power transmission or distribution line and making it open. Both ends of the power semiconductor switching device are connected in parallel with an RCD snubber circuit, or every two in reverse series The connected power semiconductor switching devices share a full-bridge RCD snubber circuit. Due to the large breaking current of DC circuit breakers, the power semiconductor switching ...

Claims

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Application Information

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IPC IPC(8): H02H3/087H02H3/06
Inventor 石巍曹冬明方太勋谢晔源杨兵王宇吕玮刘彬
Owner NR ELECTRIC CO LTD
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