A High Gain Quasi-Z Source Inverter
A source inverter, high-gain technology, applied in the field of high-gain quasi-Z source inverter circuits, can solve the problems of limited circuit application, the output and input do not share the same ground, large starting inrush current, etc., to reduce the voltage Stress, effect of high output voltage gain
Active Publication Date: 2018-09-14
SOUTH CHINA UNIV OF TECH
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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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[0015] The technical solution of the present invention has been described in detail above, and the specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.
[0016] refer to figure 1 , a kind of high-gain quasi-Z source inverter described in the present invention, it comprises voltage source, by first inductance, first diode, first capacitance, fourth inductance, fourth capacitance and fourth diode The first quasi-Z source unit composed of the second quasi-Z source unit composed of the second inductor, the second capacitor, the third diode, the third inductor and the third capacitor, the second diode, and the fifth diode Tube, three-phase inverter bridge, output filter inductor, filter capacitor and load. The anode of the voltage source is respectively connected to one end of the first inductor, the anode of the second diode, the cathode of the third capacitor and the cathode of the fourth capacitor; the o...
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The invention provides a new-type high-gain quasi-Z-source inverter. The inverter comprises a voltage source; a first quasi-Z-source unit composed of a first inductor, a first diode, a first capacitor, a fourth inductor, a fourth capacitor and a fourth diode; a second quasi-Z-source unit composed of a second inductor, a second capacitor, a third diode, a third inductor and a third capacitor; a second diode; a fifth diode; a three-phase inverter bridge; an output filtering inductor; a filtering capacitor; and a load. The single-level voltage rise and reduction features of the two quasi-Z-source units are combined in the whole circuit; the higher output voltage gain is realized; the output and input are in zero potential; the voltage pressure of the switch device in the inverter bridge is reduced; and there is no surge current when the circuit is started.
Description
technical field [0001] The invention relates to the technical field of power electronic circuits, in particular to a high-gain 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 network capacitance vo...
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IPC IPC(8): H02M7/5387
CPCH02M7/5387
Inventor 张波朱小全丘东元
Owner SOUTH CHINA UNIV OF TECH