High Efficiency High Gain DC-DC Converter with Coupled Inductor

Abstract

The invention provides a high-efficiency high-gain DC-DC (Direct Current to Direct Current) converter with a coupling inductor. A voltage-doubled output input-stage Boost converter is formed by a direct-current power supply, a switching tube, a first diode, a second diode, a fourth diode, a fifth diode, a first inductor, a second inductor, a first capacitor, a third capacitor and a fourth capacitor; an output-stage Boost converter with coupling inductor is formed by the first capacitor, the switching tube, a third diode, a second capacitor, a fifth capacitor, a sixth capacitor, the coupling inductors and a load. The input-stage Boost converter introduces the second inductor as a resonant inductor and the output-stage Boost converter adopts the coupling inductor, so that the zero current turning-on of the switching tube is realized and the zero current turning-off of each diode is realized at the same time. The converter has the advantages that the gain is extremely high and can reach 2(2+N) / (1-D)2, and the voltage stress of the switching tube is very low and is only 1 / (2+N).

Description

technical field [0001] The invention relates to the field of high-gain non-isolated DC-DC converters, in particular to a high-efficiency and high-gain DC-DC converter with coupled inductors. Background technique [0002] In recent years, high-gain non-isolated DC-DC converters are widely used in UPS, distributed photovoltaic power generation and battery energy storage systems. At present, high-gain non-isolated DC-DC converters mainly include switched capacitor type and switched inductor type. The voltage increase is achieved by adding switched capacitors or inductors, but it is difficult to achieve soft switching, which reduces the efficiency of the converter. The secondary boost converter can achieve high gain and is also very popular, but the voltage stress of the switch tube is very large, which limits the further increase of the voltage. In addition, a high gain can also be achieved through a coupled inductor, but if the leakage inductance of the coupled inductor is no...

AI Technical Summary

Problems solved by technology

At present, high-gain non-isolated DC-DC converters mainly include switched capacitor type and switched inductor type. The voltage can be increased by adding switched capacitors or inductors, but it is difficult to achieve soft switching, which reduces the efficiency of the converter.

The secondary boost converter can achieve high gain and is also very popular, but the voltage stress of the switch tube is very large, which limits the further increase of the voltage

In addition, a high gain can also be achieved through a coupled inductor, but if the leakage inductance of the coupled inductor is not controlled, it will increase the voltage stress and energy loss of the switch tube

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