Booster-flyback convertor of built-in switch coupling inductance

Abstract

The invention belongs to the technique field of power electron and relates to a booster-flyback convertor of built-in switch coupling inductance, and the booster-flyback convertor of built-in switch coupling inductance comprises a boosting module and a flyback module; the direct current power positive pole end of the boosting module is connected to the first winding dotted terminal, and the negative pole end is connected to the source of the power switch tube, the negative pole end of the output capacitor and one end of the load, the first winding synonym terminal is connected to the drain of the power switch tube, anode of catching diode and one end of the third winding, the other end of the third winding is connected to the anode of fly-wheel diode, the cathode of the fly-wheel diode is connected to the cathode of the catching diode, the positive pole of the output capacitor and flyback module; the second winding dotted terminal of flyback module is connected to the negative pole of the output capacitor and the boosting module, the synonym terminal is connected to the anode of the fly-wheel diode, the cathode of the fly-wheel diode is connected to the positive pole of the output capacitor and the other end of the load; the circuit structure is reasonable in design, safe and reliable in use, low in cost and friendly in environment with great utilization potentiality.

Description

Technical field: [0001] The invention belongs to the technical field of power electronics, and relates to a DC-DC converter, in particular to a boost-flyback converter with a built-in switch coupling inductor. Background technique: [0002] At present, the lack of non-renewable energy seriously restricts economic development, so higher requirements are put forward for the utilization of electric energy. The traditional boost converter achieves higher voltage gain by increasing the duty cycle, but when the output voltage is higher, the voltage stress on the power switch tube is greater, and the output diode has a reverse recovery problem, which will reduce the converter's output voltage. Efficiency, so the application of the boost converter is limited. In the existing technology, the flyback converter generally adopts the flyback transformer technology to achieve higher voltage gain, but the leakage inductance of the transformer winding of this technology is likely to cause ...

AI Technical Summary

Problems solved by technology

The traditional boost converter achieves higher voltage gain by increasing the duty cycle, but when the output voltage is higher, the voltage stress on the power switch tube is greater, and the output diode has a reverse recovery problem, which will reduce the converter's output voltage. efficiency, so the application of boost converters is limited

In the existing technology, the flyback converter generally adopts the flyback transformer technology to achieve higher voltage gain, but the leakage inductance of the transformer winding of this technology is likely to cause voltage spikes on the power switch tube, and the switch tube conduction and turn-off losses Larger, resulting in lower converter efficiency, therefore, this technology is generally only used in step-down small and medium power applications

The integrated boost-flyback converter in the existing conventional technology combines the flyback transformer and the boost converter to achieve a high boost ratio, but this method needs to achieve a larger The inductance and leakage inductance of the primary side and secondary side of the flyback transformer will double, which will reduce the efficiency of the converter; at the same time, the primary side of the flyback transformer will bear a higher current gain, thereby increasing the switching tube and diode current stress, resulting in an increase in the cost of the converter

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