Boost converter with built-in transformer and voltage-doubling unit of switching capacitor

Abstract

The invention discloses a Boost converter with a built-in transformer and a voltage-doubling unit of a switching capacitor, which comprises a power switching tube, an input filtering inductor, a blocking capacitor, a clamping diode, a clamping capacitor, a fly-wheel diode, the switching capacitor, an output diode, an output capacitor and a built-in transformer with two windings. The leakage inductance of the built-in transformer is utilized for realizing zero-current switching-on of the power switching tube and eliminating the backward recovery problem of the output diode and the clamping diode, a passive clamping circuit comprising the clamping diode and the clamping capacitor is utilized for realizing soft switching-off of the power switching tube and non-loss transfer of leakage inductance energy, the leakage inductance and resonance of the blocking capacitor are utilized for eliminating the backward recovery problem of the fly-wheel diode, the voltage-doubling unit comprising the built-in transformer and the blocking capacitor is utilized for realizing high-gain output of the converter and reducing the voltage stress of a power device, an additional power switch is not required, no energy loss elements exist in a circuit, and the structure is simple.

Description

technical field [0001] The invention relates to a DC-DC converter. Specifically, it is a Boost converter with a built-in voltage doubler unit of a transformer and switched capacitors. Background technique [0002] The conventional boost DC-DC converter has a simple structure and is widely used, but the power switch of the converter works in a hard switching state, the switching loss is relatively large, the voltage stress of the power switch tube is relatively large, and the output diode’s reverse The direction recovery problem is serious, and in high-gain applications, a high switching duty cycle is required, which is difficult to achieve. In recent years, some high-gain Boost converters using series switched capacitor units have been studied successively. This method needs to connect multiple switched capacitor units in series to achieve high-gain conversion. The circuit is more complicated, the reverse recovery of the freewheeling diode is serious, and the output current...

AI Technical Summary

Problems solved by technology

[0002] The conventional boost DC-DC converter has a simple structure and is widely used, but the power switch of the converter works in a hard switching state, the switching loss is relatively large, the voltage stress of the power switch tube is relatively large, and the output diode’s reverse The recovery problem is serious, and in high-gain applications, a high switching duty cycle is required, which is difficult to achieve

In recent years, some high-gain Boost converters using series switched capacitor units have been studied successively. This method needs to connect multiple switched capacitor units in series to achieve high-gain conversion. The circuit is more complicated, the reverse recovery of the freewheeling diode is serious, and the output current ripple Big

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