Control method of two-phase parallel synchronous rectification Boost converter based on forward coupling inductor

Abstract

The invention discloses a control method of a two-phase parallel synchronous rectification Boost converter based on a forward coupling inductor. The converter used in the invention only comprises first to fourth power MOSFETs, a coupling inductor, a capacitor and a resistor. The circuit structure is simple, and only one magnetic element is provided. Under the application of the PWM+ phase shift control method, the converter does not need any complex auxiliary circuit, the soft switching characteristic of a full switching tube can be ensured, the inductive current ripple is reduced to the maximum extent, and efficient boost conversion is realized. By adjusting the phase shift ratio, the converter can also work under the conditions of wide input voltage and wide load.

Description

technical field [0001] The patent of the present invention discloses a control method of a two-phase parallel synchronous rectification Boost converter based on forward coupling inductors, and relates to the technical field of power electronics. Background technique [0002] Boost converter circuit (Boost circuit) is the simplest boost DC-DC converter circuit, which is widely used in the field of power electronics technology. However, because it works in continuous current mode, it cannot realize soft switching, which will cause large switching loss and high-frequency noise, which limits its application in high-power applications. [0003] In order to improve the power level of boost converters, multi-phase interleaved parallel Boost converters are widely used in high-power applications due to their advantages of low input current ripple and low output voltage ripple. However, due to the addition of magnetic components and still working in a hard switching state, it brings ...

AI Technical Summary

Problems solved by technology

Therefore, a multi-phase interleaved parallel Boost converter based on coupled inductors came into being. Using magnetic integration technology, multiple magnetic components can be integrated on one magnetic core. When the coupled inductors are reverse-coupled, the inductor current ripple can be further suppressed. , but soft switching is still not realized, and when the coupled inductor is forward coupled, the inductor current ripple will increase significantly, and the loss of each part will also increase, which will affect the improvement of efficiency

[0004] The traditional synchronous rectification boost converter cannot realize the soft switching characteristics of the main switching tube without adding auxiliary circuits. In order to further reduce the switching loss, it is necessary to make all the switching tubes work in the soft switching mode

In the two-phase interleaved parallel synchronous rectification Boost converter based on forward coupled inductors, the inductor current can be reversed by mutual inductance, so as to realize the soft switching characteristics of all switching tubes, which can significantly reduce the switching loss of switching tubes, but in light Excessive reverse current under load conditions will cause unnecessary power circulation, so the current stress is large, and the loss of other parts will also increase

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