Current continuous high-gain switch voltage rise quasi-Z-source converter circuit

Abstract

The invention provides a current continuous high-gain switch voltage rise quasi-Z-source converter circuit. The circuit comprises a power supply; a two-port switch voltage rise unit composed of a first inductor, a first diode, a first power switch tube, a first capacitor and a second diode; a quasi-Z-source network composed of a second inductor, a second capacitor, a third capacitor and a third diode; a second power switch tube; a fourth diode; an output capacitor; and a load. The whole circuit is simple in structure; the single-level voltage rise and reduction features of the switch voltage rise unit and the quasi-Z-source network are combined; the higher output voltage gain is realized; the current of the power supply is continuous; the current of the load is continuous; the output and input are in zero potential; there is no start surge current in the circuit; and there is no surge current at the moment when the switch tube is switched on.

Description

technical field [0001] The invention relates to the technical field of power electronic circuits, in particular to a current continuous high-gain switch boost quasi-Z source converter circuit. Background technique [0002] In fuel cell power generation and photovoltaic power generation, due to the low DC voltage provided by a single solar cell or a single fuel cell, it cannot meet the electricity demand of existing electrical equipment, nor can it meet the needs of grid connection. It is often necessary to combine multiple batteries connected in series to achieve the desired voltage. On the one hand, this method greatly reduces the reliability of the entire system, and on the other hand, it needs to solve the problem of series voltage equalization. For this reason, a high-gain converter circuit capable of converting a low voltage to a high voltage is required. The Z-source boost converter proposed in recent years is a high-gain converter circuit, but the circuit has a high...

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Problems solved by technology

The Z-source boost converter proposed in recent years is a high-gain converter circuit, but the circuit has a high impedance network capacitance voltage stress, the power supply current is discontinuous, the output and input do not share the same ground, and there are The problem of large starting inrush current limits the practical application of this circuit

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