Bidirectional DC-DC converter

Abstract

The invention provides a bidirectional DC-DC topological structure, and a bidirectional DC-DC converter based on the structure. The converter comprises a coupling inductor L, a transformer T and switching tubes Q1, Q2 and Q3, and diodes D1, D2, D3 and D4, wherein the two windings Lc1 and Lc2 of the inductor L have the same turn ratio, the inductance value is Lc, and the two windings of the transformer also have the same turn ratio. The bidirectional DC-DC converter can be applied to a PCU to be used as a BCDR and also can be applied to the fields of all batteries and capacitors and the like which need charging and charging, wherein the converter has four working states: a discharging working state, a state switched from the discharging state to the charging state, a charging working state, and a state switched from the charging state to the discharging state; the numerical models in the forward and reverse directions of the bidirectional topology are both second-order minimum phase systems, so that the bidirectional converter can be subjected to parallel control easily; and the bidirectional converter shares the same coupling inductor in the charging and discharging process, and the second-order minimum phase systems and the shared same coupling inductor act together, so that the bidirectional converter has energy bidirectional high-frequency switching ability.

Description

technical field [0001] The invention belongs to the technical field of DC converters, and in particular relates to a bidirectional DC-DC converter. Background technique [0002] Bidirectional DC-DC converters are widely used in industry and aerospace, such as battery charging and discharging, new energy systems, electric vehicles, spacecraft energy systems, etc., which have the characteristics of high power density, fast dynamic response, and low cost. In some special application conditions in these fields, extremely high requirements are placed on the energy high-frequency bidirectional switching performance of bidirectional converters, such as fast starting and braking, deceleration and acceleration of electric vehicles, and power supply energy in new energy systems ( Solar energy, wind energy, fuel cells, etc.) are changing rapidly. In aerospace applications, the PCU’s adjustable power bus supplies power to loads such as pulsed TDMA or SAR, and when the energy of the sola...

AI Technical Summary

Problems solved by technology

[0007] b) The topology of the boost direction of the non-isolated bidirectional converter generally has a right-half-plane zero point, so the control and compensation link is complicated. When it is applied to multi-module parallel connection and high-frequency bidirectional energy switching, the parallel system is prone to instability

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