Multiphase switch power supply switching circuit

Abstract

The invention relates to a multiphase switch power supply switching circuit of which the total number of phases is greater than or equal to 3; the multiphase switch power supply switching circuit comprises a plurality of switching circuits, a plurality of transformers, a plurality of output rectifier circuits, a resonant network and a control circuit, wherein each transformer is provided with a primary winding and a secondary winding; each output rectifier circuit is connected to the secondary winding of the corresponding transformer; the resonant network is a multiphase symmetry mode and is provided with a plurality of symmetrical ends and multiphase branches; each symmetrical end is connected to the output side of one switching circuit respectively and correspondingly; the multiphase branches are jointly connected to a positive end point different from an input voltage source and the resonant joint end of a first reference end, and form a star connection mode; and the control circuit is connected to the output of the multiphase switch power supply switching circuit and the control end of each switching circuit respectively, and is used for controlling the breakover or cutoff of the switching circuits according to the output voltage. The multiphase switch power supply switching circuit provided by the invention can effectively reduce the ripple of input-output current, the peak current of the input current and the ripple size of the output voltage, and can provide fast response and favorable stability.

Description

technical field [0001] The invention relates to a power conversion circuit, in particular to a multi-phase switching power conversion circuit. Background technique [0002] With the continuous improvement of high power density and high efficiency requirements for power supply products, it is becoming more and more important to increase the operating frequency of the circuit. For common pulse width modulation (Pulse Width Modulation, PWM) mode power conversion circuits, a high switching frequency can reduce the size of the power supply, but at the same time means greater switching loss. [0003] Because the power conversion circuit in resonant mode uses a resonant network, the on-state loss of the switch tube may increase compared with the power conversion circuit in pulse width modulation mode. However, with the advancement of switching elements, the on-state resistance of switching elements continues to decrease, and the increase in losses due to on-state losses is becomin...

AI Technical Summary

Problems solved by technology

This method needs to add an additional component to each phase circuit, which will not only reduce the efficiency of the power conversion circuit, but also increase the size of the electronic product when applied to it

Images