Switched inductance quasi-Z source DC-DC converter circuit

Abstract

The invention provides a switched inductance quasi-Z source DC-DC converter circuit which comprises a voltage source, a first inductor, a first diode, a first capacitor, a switched inductance impedance network, a second capacitor, a switching tube, a fourth inductor, an output capacitor and a load, wherein the switched inductance impedance network consists of a second inductor, a third inductor, a second diode, a third diode and a fourth diode. According to the switched inductance quasi-Z source DC-DC converter circuit, the voltage source, the first inductor, the first capacitor and the switching tube are sequentially connected in series to form a first-stage booster circuit; the second capacitor, the switched inductance impedance network and the switching tube are sequentially connected in series to form a second-stage booster circuit; the fourth inductor, the output capacitor and the load form an output circuit; the whole circuit is simple in structure and free of starting impulse current and transient impulse current generated by the turning on of the switching tube, and has higher output voltage gain and lower capacitance voltage stress, only one switching tube is adopted, power current and load current are both continuous, and common ground for input and output is ensured.

Description

technical field [0001] The invention relates to the technical field of power electronic circuits, in particular to a switch inductance type quasi-Z source DC-DC converter circuit. Background technique [0002] In fuel cells and photovoltaic power generation, due to the low DC voltage provided by a single solar cell or a single fuel cell, which is generally only about tens of volts, it cannot meet the electricity demand of existing electrical equipment, such as the LED drive with centralized DC power supply. A high DC input voltage of hundreds of volts is required in the circuit, so it is often necessary to connect multiple batteries in series to achieve the required high voltage. However, on the one hand, this greatly reduces the reliability of the entire system, and on the other hand, it is necessary to solve the problem of series voltage equalization. For this reason, a high-gain DC-DC converter capable of converting low voltage to high voltage is required. The Z-source ...

AI Technical Summary

Problems solved by technology

The Z-source DC-DC converter proposed in recent years is a DC-DC converter with high voltage gain, but the circuit has high capacitive voltage stress, and its capacitive voltage stress is equal to the output voltage, and its power supply current Discontinuous, the output and input do not share the same ground, and there is a large startup inrush current problem when the circuit starts, thus limiting the practical application of the circuit

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