DC-DC forward boost-buck power conversion circuit based on cascade Cuk topology

By using a cascaded Cuk topology and same-frequency drive signal control, positive voltage output and high voltage gain are achieved, solving the output voltage polarity problem of traditional Cuk converters and improving the integration and efficiency of power electronic systems.

CN121546920AActive Publication Date: 2026-02-17HUAQIAO UNIVERSITY
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Patent Information

Application Number
CN202610070102.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-20
Publication Date
2026-02-17
Estimated Expiration
2046-01-20

AI Technical Summary

Technical Problem

The traditional Cuk converter has an output voltage polarity opposite to the input voltage, making it unsuitable for applications requiring positive voltage power supply. This increases system complexity, cost, and power loss, making it difficult to meet the demands of modern power electronic systems for high integration and high efficiency.

Method used

By adopting a cascaded Cuk topology, two Cuk topology units are controlled by a co-frequency drive signal generator to share an inductor, achieving current continuity and positive voltage output. The operating mode is switched using a pulse width modulation signal, which improves voltage gain and simplifies control.

Benefits of technology

It achieves efficient and smooth forward voltage conversion, reduces current ripple and switching losses, and improves the power density and efficiency of the circuit. It is suitable for applications with high voltage gain and current quality requirements, such as new energy power generation and storage systems and electric vehicles.

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Abstract

The invention provides a DC-DC forward boost-buck power conversion circuit based on cascaded Cuk topologies, and relates to the technical field of power electronic conversion, the circuit is mainly formed by cascading two Cuk topologies sharing one inductor, and the circuit also comprises a power supply end, a load end and a same-frequency driving signal generator. The same-frequency driving signal generator controls the two power switch tubes in the Cuk topology through a same-frequency signal, and the output voltage is adjusted by adjusting the duty ratio. The circuit not only keeps the advantage of continuous input and output current of a traditional Cuk circuit, but also converts the polarity of the output voltage from the reverse direction to the forward direction, and meanwhile, the voltage gain is remarkably improved, so that forward voltage conversion can be efficiently and smoothly realized. The circuit structure has the characteristics of high gain, forward output, continuous current, simple control and the like, and is suitable for occasions requiring high-efficiency and high-quality electric energy conversion, such as new energy power generation and energy storage, electric automobiles, precision industry and the like.
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