Resonant switching circuit

Abstract

The embodiment of the invention provides a resonant switching circuit. The resonant switching circuit comprises at least two resonant switching circuit units, wherein the resonant switching circuit units are staggered and connected in parallel, and magnetic devices in the resonant switching circuit units are alternately and magnetically integrated on the same magnetic core. As the magnetic devices integrated on the same magnetic core can exert a magnetic path coupling effect, a self current-balancing effect can be produced by currents on circuit branches of different phases, so that the current balance of the resonant switching circuit units in the resonant switching circuit is realized, and the volume of a power supply is reduced due to the integration of the magnetic devices.

Description

technical field [0001] The invention relates to the field of power supplies, in particular to a resonant conversion circuit. Background technique [0002] The resonant conversion circuit has the advantage of high conversion efficiency, so it is used more and more. The typical LLC symmetrical half-bridge resonant conversion circuit unit is as follows: figure 1 As shown, including switching devices Q1, Q2, resonant inductance Lr, excitation inductance Lm of transformer Tr, resonant capacitors Cr1, Cr2, rectifier devices D1, D2, this resonant conversion circuit is connected to a DC power supply, and the power energy is transferred to The secondary side is supplied to the load R after being filtered by the filter capacitor C. [0003] Although the resonant conversion circuit can obtain high conversion efficiency, the ripple current passing through the filter capacitor C is easy to exceed the standard when the output power is high. power supply, for example, such as figure 2 ...

AI Technical Summary

Problems solved by technology

[0005] In view of this, an embodiment of the present invention provides a resonant conversion circuit, which aims to solve the problem of uneven current sharing of the existing resonant conversion circuit units connected in parallel and interleaved.

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