dc-dc converter based on isolated half-bridge anpc three-level and h-bridge

Abstract

The invention discloses a dual active bridge DC-DC converter based on an isolated half-bridge active neutral point clamp (ANPC) three-level and H-bridge, including a high-voltage side half-bridge ANPC three-level circuit and an auxiliary inductor , transformer and low-voltage side H-bridge circuit. The high-voltage side half-bridge ANPC three-level circuit and the low-voltage side H-bridge circuit are used for rectification and inverter, connected through auxiliary inductors and transformers. Among them, the auxiliary inductor is used to realize power transmission and zero-voltage turn-on of the switch tube, and the transformer is used for electrical isolation and voltage conversion. The advantages of the present invention are: using the ANPC three-level circuit, the voltage level is improved, and the redundant switch state is used to improve the power loss distribution, increase the maximum output power, and reduce the size of the radiator; the use of the low-voltage side H-bridge circuit can realize Low cost and low on-state loss; through the auxiliary inductor and phase shift controller, the switching loss can be effectively reduced, the volume of the converter can be reduced, the power density and efficiency of the converter can be improved, and the cost can be reduced.

Description

technical field [0001] The present invention relates to the technical field of isolated bidirectional DC-DC converter circuit topology, more specifically, to a DC based on an isolated half-bridge Active Neutral Point Clamped (Active Neutral Point Clamped, ANPC) three-level and H-bridge - DC converter. Background technique [0002] Dual Active Bridge (DAB) isolated bidirectional DC-DC converter (Isolated Bidirectional DC-DC Converter) has the advantages of modular symmetrical structure, bidirectional power transmission capability and easy implementation of soft switching, and can be used as a DC power distribution The interface circuit between the busbars of all levels in the network can also be used in fields such as DC drive. [0003] The active bridge structure adopted by the traditional double active bridge isolated bidirectional DC-DC converter is mostly H-bridge circuit converter. This kind of converter has the characteristics of high reliability, simple structure and...

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Problems solved by technology

[0005] Aiming at the defect of existing double active bridge type isolated bidirectional DC-DC conversion circuit, the purpose of the present invention is to solve the dual active bridge type isolated bidirectional DC-DC converter with H bridge circuit as active bridge circuit form Problems such as low withstand voltage, poor performance and high cost when applied to occasions with high voltage level on the high-voltage side and large input-to-output voltage conversion ratio

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