Non-isolated soft switching circuit

By introducing a non-isolated soft-switching circuit into the DC-C power distribution system, and utilizing the cooperation of the transformer circuit and the controller, the high loss problem of the main power transistor and diode is solved, achieving more efficient power conversion.

CN114070048BActive Publication Date: 2026-07-17ZTE CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZTE CORP
Filing Date
2020-07-31
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

In existing DC-C power distribution systems, the losses when the main power transistor is turned on are relatively large, and the reverse recovery losses of the diode are also relatively large. Especially when the load is large, the average value of the inductor current is large, resulting in excessive losses in the inductor and the main power transistor.

Method used

A non-isolated soft-switching circuit is adopted. Through the cooperation of the transformer circuit and the controller, the current flowing through the first switching element is controlled to slowly decrease to zero before conduction. The resonant process of the transformer circuit is used to reduce the junction capacitance voltage of the switching element and reduce switching losses.

Benefits of technology

It effectively reduces switching losses in the power conversion circuit, reduces turn-on losses of the main power transistor and reverse recovery losses of the diode, and improves circuit efficiency.

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Abstract

The embodiment of the present application provides a kind of non-isolated soft switching circuit, it is characterized in that, including: input power supply, power conversion circuit, transformer circuit, controller and load, wherein, power conversion circuit includes: first inductive element, first switching element and first rectifier element, first inductive element is connected with first switching element and first rectifier element respectively;Primary side circuit of transformer circuit is connected in parallel with first switching element, secondary side circuit of transformer circuit is connected in parallel with first rectifier element;Controller is connected with first switching element and transformer circuit respectively;Input power supply is connected with first inductive element by first switching element;Load is connected with power conversion circuit and transformer circuit.By the embodiment of the present application, the switching loss of each element in power conversion circuit is effectively reduced.
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