Single-stage isolated bidirectional ac / dc converter, control method and related apparatus

By designing a single-stage isolated bidirectional AC/DC converter, bidirectional energy transfer is achieved by using a controller to control the high-frequency operation of the controllable switching transistor. This solves the problems of complex structure and low integration in existing technologies, and realizes efficient and low-cost AC/DC conversion.

CN122225879APending Publication Date: 2026-06-16SUNGROW POWER SUPPLY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SUNGROW POWER SUPPLY CO LTD
Filing Date
2026-03-31
Publication Date
2026-06-16

AI Technical Summary

Technical Problem

Existing isolated AC/DC converters have a complex two-stage architecture, insufficient integration, and high hardware costs and power losses.

Method used

It adopts a single-stage isolated bidirectional AC/DC converter, including primary circuit, transformer and secondary circuit. The high-frequency operation of the controllable switching transistor is controlled by the controller to realize bidirectional energy transfer. The rectifier circuit is omitted. It has high integration, high energy transfer efficiency and high power density.

Benefits of technology

It achieves a simple structure, small size, and low hardware cost bidirectional AC/DC conversion, and can realize power factor correction and voltage conversion functions on the AC side, adapting to the energy feedback needs of various application scenarios.

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Abstract

The application discloses a single-stage isolated bidirectional AC / DC converter, a control method and related devices. The converter comprises a controller, a primary side circuit, a transformer and a secondary side circuit. The primary side circuit comprises a first inductor, a direct current blocking capacitor and a bidirectional switch. The first end of the first inductor is connected to the first pole of an alternating current source, and the bidirectional switch is connected between the second end of the first inductor and the second pole of the alternating current source. The bidirectional switch comprises a first switch tube and a second switch tube connected in series. The secondary side circuit is connected to the secondary side winding of the transformer and comprises a rectifier circuit comprising a controllable switch tube. When energy is discharged reversely from the secondary side winding to the primary side winding, the controller controls the first switch tube and the second switch tube to act according to the frequency of the alternating current source, controls the controllable switch tube to act at a high frequency to make the rectifier circuit work in a reverse inverter state, and realizes reverse energy conversion.
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