A Forward Feedback Snubber Circuit for Improving the Efficiency of DC Solid State Circuit Breakers

Abstract

The invention discloses a forward feedback type absorption circuit for improving the efficiency of a DC solid-state circuit breaker, which relates to the technical field of power electronics, and includes voltage peak absorption at both ends of a first main power tube and a second main power tube connected in parallel in reverse series respectively. circuit, forward energy storage circuit, reverse energy storage circuit and energy feedback circuit connected in parallel at both ends of the power supply, the first end of the first main power tube is connected to the positive pole of the power supply, the second end of the second main power tube is connected to one end of the load, the load The other end is connected to the negative pole of the power supply, the voltage peak absorption circuit is used to absorb the voltage peak, the forward energy storage circuit and the reverse energy storage circuit are used to store energy when the load is short-circuited, and the energy feedback circuit is used to feed back the stored energy to the power supply. While providing the function of absorbing voltage spikes, the circuit enables the energy to be fed back to the power supply and improves the efficiency of the DC solid-state circuit breaker.

Description

A forward feedback absorption circuit to improve the efficiency of DC solid-state circuit breakers technical field The present invention relates to the technical field of power electronics, especially a kind of forward feedback that improves the efficiency of DC solid state circuit breakers absorption circuit. Background technique Compared with Si devices, SiC devices have wider band gap, higher thermal conductivity, higher critical field strength As well as faster electron migration rate, it has obvious advantages in high temperature and high pressure resistance, switching speed, operating frequency, etc. high-speed and high-power applications. The absorption effect of the existing ordinary RCD absorption circuit or MOV absorption circuit is relatively poor, and cannot be realized Efficient use of energy. In practical applications, if the ordinary absorption circuit is directly used, the circuit breaker generates serious heat and has a long service life. Reduce...

AI Technical Summary

Problems solved by technology

[0003] The existing ordinary RCD absorbing circuit or MOV absorbing circuit has relatively poor absorbing effect, and cannot realize effective utilization of energy

In practical application, if the ordinary absorbing circuit is used directly, the circuit breaker will heat up seriously, the service life will be greatly reduced, and it will be difficult to make insulation

[0004] At present, many methods have been proposed for the optimization of the absorption circuit of DC solid-state circuit breakers in the literature, and their designs are all about voltage spike suppression, which does not reflect the improvement of efficiency.

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