High-transformation-ratio bidirectional half-bridge current-doubling converter

Abstract

The invention provides a high-transformation-ratio bidirectional half-bridge current-doubling converter in the field of power electronics. The converter comprises a low-voltage power supply V1, a high-voltage power supply V2, a high-frequency transformer Tx, a capacitor C3, a capacitor C3, a blocking capacitor Cb, a current-doubling rectifying circuit, a half-bridge circuit and a half-bridge voltage division circuit; the number of turns of the primary side of the high-frequency transformer Tx is Np, and the number of turns of the secondary side of the high-frequency transformer Tx is Ns; the low-voltage power supply V1, the capacitor C3 and the current-doubling rectifying circuit are connected in parallel, and the current-doubling rectifying circuit is connected with the primary side of the high-frequency transformer Tx; the high-voltage power supply V2, the half-bridge circuit and the half-bridge voltage division circuit are connected in parallel; one end of the blocking capacitor Cbis connected with the c end of the secondary side of the high-frequency transformer Tx, and the other end of the blocking capacitor Cb is connected with the half-bridge circuit; and the d end of the secondary side of the high-frequency transformer Tx is connected with the half-bridge voltage division circuit. The converter has the advantages that the current ripples and the switch tube stress arereduced; the safety and the transformation ratio of the converter are improved; and the structure is simple, and a control method is simple.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to a bidirectional half-bridge current doubler converter with high transformation ratio. Background technique [0002] Bidirectional DC / DC converter is a DC-DC conversion topology that can realize both energy bidirectional transmission and electrical isolation. There are broad application prospects in the field of energy storage systems. Compared with other topologies, this type of topology uses transformers for bidirectional energy transmission, which can realize bidirectional conversion of high ratio energy between the low-voltage side and the high-voltage side. The switching tube with the main circuit is easy to achieve soft switching, low power consumption, and high efficiency. , small size and other characteristics, so it is widely used in the field of power electronic products such as switching power supply. [0003] Traditional converters include the following three types: ...

AI Technical Summary

Problems solved by technology

[0004] One is the non-isolated unidirectional parallel DC/DC converter, which consists of two or more unidirectional DC/DC converters connected in parallel; the advantage of this type of converter is that the power can be paralleled to a large size, but there are the following Disadvantages: The number of parallel unidirectional DC/DC converters is large, the design cost is high, the volume is large, the control method is complicated, and the input and output are not isolated, the safety is low, and the damage to the load is large after the power supply is abnormal. Not suitable for some applications

[0005] The second is an isolated voltage bidirectional DC/DC converter, which includes a set of electrical isolation transformers and two sets of high-frequency rectification/inversion units; the advantage of this converter is that it is controlled by voltage and has a fast response speed. However, there are the following disadvantages: there is a volta

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