Control circuit of interleaved parallel bidirectional Buck-Boost converter

Abstract

The invention discloses a control circuit of an interleaved parallel bidirectional Buck-Boost converter and belongs to the field of converters. The converter can work in a charging state or a discharging state according to actual needs, a voltage outer loop and a current inner loop generate regulating variables, and the output of the current inner loop is multiplied by a preset period T to obtain the conduction time of a switching device; according to a volt second balance theorem, required turn-off time can be calculated, so that the inductive current can be controlled to be in a critical conduction mode. According to the control circuit of the interleaved parallel bidirectional Buck-Boost converter, a high-precision high-frequency current sampling circuit and a zero-cross detection circuit can be avoided, the inductive current can be controlled to be in a critical continuous state just by sampling voltage signals and low-frequency current signals. The method has the advantage of low cost.

Description

technical field [0001] The invention relates to the technical field of converters, in particular to an interleaved parallel bidirectional Buck-Boost converter control circuit. Background technique [0002] When the existing interleaved parallel bidirectional Buck-Boost converter is working, controlling the critical continuity of the inductor current can reduce the switching loss of the switching device and improve the efficiency of the converter, but the traditional solution requires a high-precision high-frequency current sampling circuit and a zero-crossing detection circuit. , the hardware cost is higher. Contents of the invention [0003] The purpose of the present invention is to provide a control circuit of interleaved parallel bi-directional Buck-Boost converters to reduce costs. [0004] The object of the present invention is achieved like this: a kind of control circuit of interleaved parallel bidirectional Buck-Boost converter, comprises the first gating device,...

AI Technical Summary

Problems solved by technology

[0002] When the existing interleaved parallel bidirectional Buck-Boost converter is working, controlling the critical continuity of the inductor current can reduce the switching loss of the switching device and improve the efficiency of the converter, but the traditional solution requires a high-precision high-frequency current sampling circuit and a zero-crossing detection circuit. , higher hardware cost

Images