Resonant converter and its control method, device and power supply equipment

Abstract

The present application is applicable to the technical field of electronic circuits, and provides a resonant converter and its control method, device, and power supply equipment, wherein the switch circuit includes a full-bridge switch unit and a half-bridge auxiliary switch unit, and the transformer circuit includes a first transformer and The second transformer; the first output terminal and the second output terminal of the full-bridge switch unit are respectively connected to the first input terminal and the second input terminal of the transformer circuit, and the output terminal of the half-bridge auxiliary switch unit is connected to the third input terminal of the transformer circuit terminal, the same name terminals of the primary coil of the first transformer and the second transformer are the first input terminal and the third input terminal of the transformer circuit respectively, the synonym terminal of the primary coil of the first transformer and the primary side of the second transformer The different names of the coils are connected together as the second input end of the transformer circuit; the control device is used to control the on-off of the switch circuit based on the target switch control strategy corresponding to the target gain, so that the switch tube is both turned on and off. Realize soft switching and can be used in wide output voltage range scenarios.

Description

technical field [0001] The application belongs to the technical field of electronic circuits, and in particular relates to a resonant converter and its control method, device, and power supply equipment. Background technique [0002] A resonant converter is a voltage conversion device that realizes output voltage regulation by adjusting the switching frequency. The traditional resonant converter can realize the zero voltage switch (ZVS) function by adjusting the on-off duration of the switch in the switching circuit. However, the traditional resonant converter can only realize the ZVS function and cannot realize the zero current switch function, resulting in a large turn-off loss of the switch tube, which reduces the power conversion efficiency of the resonant converter as a whole. [0003] In order to improve the power conversion efficiency of the resonant converter, the traditional method is to fix the switching frequency of the resonant converter near the resonant freque...

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Problems solved by technology

[0004] In view of this, the embodiments of the present application provide a resonant converter and its control method, device, and power supply equipment to solve the problem that the traditional resonant converter that can work in a state close to ZVZCS cannot be applied to a wide output voltage range scenario, which limits Technical issues of application scenarios of resonant converters

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