High-efficiency and high-gain dc-dc converter with dual coupled inductors

Abstract

The invention provides a high-efficiency high-gain DC-DC converter with double coupling inductors. The high-efficiency high-gain DC-DC converter with the double-coupling inductors comprises an input level Boost converter with a first coupling inductor and an output level Boost converter with a second coupling inductor. The input level Boost converter is composed of a direct-current power supply, a switching tube, a first diode, a second diode, a fourth diode, a fifth diode, the first coupling inductor, a first capacitor, a second capacitor and a fifth capacitor. The output level Boost converter is composed of a second capacitor, a switching tube, a third diode, a sixth diode, a seventh diode, a third capacitor, a fourth capacitor, a sixth capacitor, the second coupling inductor and loads. The inductors are adopted in the input level Boost converter and the output level Boost converter. Zero-current switching-on of the switching tubes is achieved, and meanwhile zero-current switching-off of each diode tube is achieved. The converter is high in gain which can reach (2+N1)(2+N2) / (1-D)2, and the voltage stress of the switching tubes is low and is only 1 / (2+N2) of the output voltage.

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 dual coupling 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...

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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