A Switched Inductor Type Hybrid Quasi-Z Source Inverter

Abstract

The present invention provides a switched inductance hybrid quasi-Z source inverter circuit, including a voltage source, which is composed of a first inductance, a second inductance, a fourth diode, a fifth diode and a sixth diode Switching inductance unit, a switching boost unit composed of a first capacitor, a first diode, a second diode and a MOS transistor S, composed of a third inductance, a second capacitor, a third capacitor and a third diode The quasi-Z source unit, three-phase inverter bridge, output filter inductor, filter capacitor and load. The whole circuit combines the single-stage buck-boost characteristics of the switching boost unit and the quasi-Z source unit and the characteristics of parallel charging and series discharging of the switching inductor, which has a higher output voltage gain, and the output and input share the same ground, reducing the inverter The voltage stress of the switching devices in the bridge, and the circuit does not have the inrush current at startup and the inrush current at the moment when the switch tube is turned on.

Description

technical field [0001] The invention relates to the technical field of power electronic circuits, in particular to a switching inductance hybrid quasi-Z source inverter 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 impedance netw...

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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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