Dual output DC-DC converter for multiplexing bridge arm

Abstract

The invention discloses a dual output DC-DC converter for a multiplexing bridge arm. The converter comprises a first contravariant bridge arm and a second contravariant bridge arm which respectively consist of a power switching tube with inverse parallel diodes, a first output circuit and a second output circuit, wherein the first output circuit is connected between middle points of the first contravariant bridge arm and the second contravariant bridge arm; the second output circuit is connected between the middle point of the second contravariant bridge arm and the negative electrode of a power supply (or the middle point of a capacitive division network); the first output circuit consists of an isolated rectification circuit and a filter circuit, and output of the circuit is adjusted through phase displacement between the first contravariant bridge arm and the second contravariant bridge arm; the second output circuit consists of a resonant network, a second rectification circuit and a second filter circuit, output of the circuit is adjusted through frequency; the first path output and the second path output are independent and not affected with each other; the first contravariant bridge arm is used as a lead bridge arm in phase-shifting control, each power switching tube can easily realize zero voltage switching; and the second contravariant bridge arm used as multiplexing bridge arm of two paths output realizes energy of a soft switch to be supplied together by the two paths output, thereby easily realizing zero voltage switching as well.

Description

technical field [0001] The invention relates to a DC-DC converter, in particular to a full-bridge phase-shifting controlled DC-DC converter and a half-bridge frequency-controlled DC-DC resonant converter. Background technique [0002] The dual-output power supply can provide two independent adjustable voltages, and can also provide positive and negative symmetrical adjustable voltages, so it is widely used. Compared with the dual-output power supply with a single-transistor conversion structure, the bridge structure can provide greater power capacity, and it is easy to make each power switch tube work in a soft switching state, so it has been widely used in high-power applications. However, since the bridge structure requires multiple power switch tubes, the cost is high and the volume is large, therefore, how to effectively use the power components and improve the utilization rate of the devices is a problem of great research value. [0003] In order to improve the utiliza...

AI Technical Summary

Problems solved by technology

The disadvantage of this invention is: the half-bridge works at a fixed frequency and pulse width, so the power it transmits is constant, and the output voltage of this channel is actually uncontrollable

The disadvantages of this technology are: each output is in an asymmetric working state, and the transformer is not fully utilized; each output interacts with each other, and the coupling is serious; the control strategy involves the cooperation between the duty cycle and the phase shift, which is difficult to realize

Images