DC/DC converter

Abstract

The invention relates to a DC / DC converter. The DC / DC converter comprises an inverter unit, a resonance unit, a high-frequency transformer and a rectification smoothing unit. The inverter unit comprises semi-bridge circuits or a full-bridge circuit, wherein the semi-bridge circuits are under the action of control signals modulated by the asymmetry and complementary pulse width or the full-bridge circuit is under the control of the constant frequency phase-shift to convert the direct-current input into square waves; the resonance unit obtains the square weaves output by the inverter unit to make the square weaves be in the resonance state. The resonance unit comprises a resonance inductor, a first resonance capacitor and a second resonance capacitor. The rectification smoothing unit is used for combining various LC smoothing in a current-doubler rectification or full-wave rectification or full-bridge rectification mode and converting altering current waves on the secondary side of the high-frequency transformer into direct-current output. The DC / DC converter has the following advantages that the control mode is simple, the output ripple is small, conversion efficiency is high and the transformer is simple in design.

Description

technical field [0001] The present invention relates to power supplies, and more particularly, to a DC / DC converter. Background technique [0002] Generally speaking, the resonant network is applied to the power conversion circuit, which can effectively reduce the switching loss and noise of the circuit, reduce electromagnetic interference, reduce the voltage and current pressure of the device, increase the switching frequency, improve efficiency, reduce volume and weight, and increase power for the converter. Density creates good conditions. At present, the widely used LLC resonant topology adopts PFM control in the control method, that is, the switching frequency changes, which makes the design of the control method complicated; when PFM control is used, the transformer needs to be designed according to the minimum operating frequency, and the design of the transformer itself is complicated. The parameters are difficult to optimize; in the synchronous rectification circu...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a kind of A DC / DC converter with simple control mode, optimized design of transformer, simple design of synchronous rectification drive control circuit, and small output ripple current

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