Multi-phase staggered parallel DC-DC converter device

Abstract

The invention discloses a multi-phase staggered parallel DC-DC converter device. The multi-phase staggered parallel DC-DC converter device comprises a multi-phase staggered parallel converter main circuit and a control circuit which are connected with each other, wherein the control circuit comprises a voltage controller, a plurality of full-load range regulators, a plurality of current sharing controllers and a PWM modulation circuit, the plurality of full-load range regulators are arranged in parallel, the plurality of current sharing controllers are arranged in parallel, an output end of the voltage controller is connected with input ends of the full-load range regulators, output ends of the full-load range regulators are connected with input ends of current sharing controllers, and thecurrent sharing controllers are connected with each branch in the multi-phase staggered parallel converter main circuit by the PWM modulation circuit. By the device, the application range of the multi-phase staggered parallel DC-DC converter is expanded, and the device is still applicable to conditions which each phase device parameter is different; and within a full-load range, stable running ofthe converter in an inductance current continuous mode is achieved, and the problems of oscillation and instability of the converter caused by switching between the continuous mode and an interruptedmode are solved.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a multi-phase interleaved parallel DC-DC converter device. Background technique [0002] With the development of new energy sources such as wind power generation, solar power generation, and fuel cells, the application of DC-DC converters is becoming more and more extensive, and new requirements are put forward for the converter, that is, greater power and higher reliability , Higher switching frequency. [0003] To increase the capacity of single-phase DC-DC converters, high-power switches are expensive, and the design of inductors and transformers is complicated; while multiple DC-DC converters work in parallel, the problem of current sharing between converters needs to be considered, and system reliability is reduced. Auxiliary materials increase, increasing costs. The parallel connection technology of DC-DC converters can be roughly divided into two methods: the p...

AI Technical Summary

Problems solved by technology

However, the current multi-phase interleaved parallel DC-DC converter requires the parameters of each phase branch to be strictly consistent, and the current sharing of each phase cannot be achieved when the parameters are inconsistent.

At the same time, Buck and Boost have two modes of continuous inductor current and intermittent inductor current. The mathematical models are the second-order system and the first-order system respectively. The control algorithms are very different, and the current regulation within the full load range cannot be realized.

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