SiC/Si hybrid parallel switch device and optimization control method thereof

Abstract

The invention discloses an SiC / Si hybrid parallel switch device and an optimization control method thereof. The device comprises an SiC device group connected between the input end and the output end of the switch device and an Si device group connected between the two ends of the SiC device group in parallel. The SiC device group is formed by the parallel connection of m SiC devices, and m is a positive integer larger than 1. The Si device group is formed by the parallel connection of n Si devices, and n is a positive integer larger than 1. According to the load current between the input end and the output end of the switch device, the switch-on or switch-off of the SiC device group and the Si device group is controlled. According to the method, the loss of a power converter can be reduced to the maximum degree, the overload working ability is improved, the safe working area of a hybrid parallel device is enlarger, in addition, while the power processing ability of the power converter is improved, the loss of the power device is reduced as much as possible, at the same time, the loss and cost of a system are reduced, and the overload requirement of the power converter is satisfied.

Description

technical field [0001] The invention relates to a SiC / Si hybrid parallel switching device and an optimization control method thereof, belonging to the technical field of power switching devices. Background technique [0002] In recent years, SiC devices have become ideal devices for improving the efficiency and power density of power converters due to their advantages such as low on-resistance, fast switching speed, and high temperature and high pressure resistance. However, compared with Si devices, the cost of SiC devices is higher, and the high-power converter with all SiC devices will greatly increase the cost of the system. [0003] Many important occasions have overload requirements for power converters. For example, in UPS power supplies, the typical overload requirements are 150% overload operation for 10s to 60s, and 2 times overload operation for 10 to 20 cycles. Compared with Si devices, SiC devices have lower overload capability due to their smaller dies. Some ...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, provide a SiC / Si hybrid parallel switching device and its optimization control method, and solve the problem that the existing power switching device cannot realize the mixing of switching devices, and the power loss of the switching device is large , The problem of low overload capacity

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