Vehicle auxiliary power supply DC-DC converter and control method thereof

By using the Buck-Boost-LLC converter system and unique control method in the vehicle auxiliary power supply DC-DC converter, the problems of insufficient input voltage range and large conduction loss in the prior art are solved, and efficient and low-cost power conversion is achieved.

CN110768538BActive Publication Date: 2025-03-18GUANGXI UNIVERSITY OF TECHNOLOGY
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Patent Information

Application Number
CN201911165054.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2019-11-25
Publication Date
2025-03-18
Estimated Expiration
2039-11-25

AI Technical Summary

Technical Problem

The existing automotive auxiliary power DC-DC converters have problems such as insufficient input voltage range, large conduction loss, low conversion efficiency, high heat and electrical stress, and high cost.

Method used

The Buck-Boost-LLC converter system adopts a unique structural layout. Through the combination of the parallel structure of the Buck converter and the Boost converter and the LLC resonant converter, high-precision and large-range voltage regulation are achieved, and the zero voltage conduction and low loss of the power switch tube are achieved through a unique control method.

Benefits of technology

It realizes wide input voltage range, low conduction loss, high conversion efficiency, low power switching tube loss and reduced cost, improving the overall performance and reliability of the converter.

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Abstract

The present invention aims to provide a vehicle-mounted auxiliary power DC-DC converter, including an input capacitor C1, a Buck converter, a Boost converter, an output capacitor C2, and an LLC resonant converter; the Buck converter and the Boost converter are respectively composed of two branches, and the two branches of the Buck converter are connected in series with the two branches of the Boost converter in a one-to-one correspondence to form two groups of parallel Buck-Boost branch structures; the Buck-Boost branch structure is connected to the vehicle power battery in parallel with the input capacitor C1, and the Buck-Boost branch structure is connected to the input end of the LLC resonant converter in parallel with the output capacitor C2. The present invention also provides an integrated digital control method for a vehicle-mounted auxiliary power DC-DC converter. The converter overcomes the defects of the prior art and has the characteristics of a wide input voltage range, low conduction loss, and low cost.
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