Parameter design method of DC-DC resistor-capacitor absorption circuit before vehicle auxiliary power supply

By creating time domain and S domain circuit models in the pre-stage DC-DC circuit of the vehicle auxiliary power supply, the parameter design of the resistance-capacitance absorption circuit is optimized, and the difficulty of parameter design in the existing technology is solved, effectively suppressing voltage oscillation and reducing power loss are achieved.

CN114004099BActive Publication Date: 2025-05-02CRRC QINGDAO SIFANG ROLLING STOCK RESEARCH INSTITUTE CO LTD
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Patent Information

Application Number
CN202111307977.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2021-11-05
Publication Date
2025-05-02
Estimated Expiration
2041-11-05

AI Technical Summary

Technical Problem

The existing vehicle-mounted auxiliary power supply pre-stage DC-DC resistance-capacitance absorption circuit has difficulties in parameter design, resulting in increased power loss or insufficient voltage oscillation to suppress.

Method used

By creating time-domain and S-domain circuit models of resistive-capacitance absorption circuits, the resistance heating power and voltage oscillation peaks are comprehensively evaluated, thereby optimizing the selection of resistive-capacitance parameters.

Benefits of technology

It realizes that within the design requirements of the pre-stage DC-DC circuit, the oscillation of the secondary side voltage of the transformer is effectively suppressed, the power loss of the circuit is reduced, and the design flexibility is improved.

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Abstract

An embodiment of the present invention relates to a method for designing parameters of a capacitive-resistive absorption circuit for the front-stage DC-DC of an in-vehicle auxiliary power supply. The method includes: creating first time-domain and S-domain models of the front-stage DC-DC circuit; determining first voltage and current S-domain expressions of the capacitive-resistive absorption circuit; substituting preset system parameters into the first voltage and current S-domain expressions to generate corresponding second voltage and current S-domain expressions; determining the capacitance parameter C according to the second voltage S-domain expression S ; performing time-domain expression conversion on the second voltage and current S-domain expressions to generate corresponding first voltage and current time-domain expressions; determining the resistance parameter R according to the capacitance parameter C S , the first voltage, and the first current time-domain expressions S . Through the present invention, the design accuracy is ensured.
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Citation Information

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