High-efficiency, high-gain, and low-voltage and current-stress dc-dc converters

Abstract

The invention provides a DC-DC (Direct Current to Direct Current) converter with high efficiency, high gain and low voltage and current stresses. In the DC-DC converter, a direct-current power supply, a switch tube, a first diode, a second diode, a fourth diode, a fifth diode, a first inductor, a third inductor, a first capacitor, a third capacitor and a fourth capacitor construct an input-grade Boost converter; the first capacitor, the switch tube, a third diode, a sixth diode, a seven diode, an eighth diode, a ninth diode, a second inductor, a fourth inductor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a second capacitor and a load construct an output grade Boost converter. The input Boost converter and the output Boost converter are connected to the second inductor and the fourth inductor to serve as resonant inductors, so that the zero current turning-on of the switch tube is realized; meanwhile, the zero current turning-off of each diode is realized. The gain of the converter is 6 / (1-D)2, and the voltage stress of the switch tube is one third that 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 DC-DC converter with high efficiency, high gain and low voltage and current stress. 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 the leakage inductance of the coupled ind...

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, high gain can also be achieved through coupled inductors, but the leakage inductance of coupled inductors is difficult to control, which will increase the voltage stress and energy loss of the switch tube

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