Switch inductor type hybrid quasi-Z-source inverter

A technology of switching inductors and source inverters, applied in the direction of adjusting electrical variables, instruments, electrical components, etc., can solve problems such as large start-up inrush current, output and input not sharing ground, power supply current discontinuity, etc., to achieve output voltage High gain, good suppression effect, and improved reliability

Active Publication Date: 2016-09-14
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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  • Switch inductor type hybrid quasi-Z-source inverter
  • Switch inductor type hybrid quasi-Z-source inverter
  • Switch inductor type hybrid quasi-Z-source inverter

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Embodiment Construction

[0014] 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.

[0015] refer to figure 1 , a switching inductance hybrid quasi-Z source inverter circuit according to the present invention, which includes a voltage source V i , switch inductor unit, switch boost unit, quasi-Z source network, three-phase inverter bridge, output filter inductor, filter capacitor and three-phase symmetrical load. The switching inductance unit consists of a first inductance L 1 , the second inductance L 2 , the fourth diode D 4 , the fifth diode D 5 and the sixth diode D 6 constituted; the switching boost unit is composed of a first capacitor C 1 , the first diode D 1 , MOS transistor S and the second diode D 2 constitute; the quasi-Z source network consists of a third inductor L 3 , the second capacitance C 2 , the third capa...

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Abstract

The invention provides a switch inductor type hybrid quasi-Z-source inverter. The inverter comprises a voltage source, a switch inductor unit which consists of a first inductor, a second inductor, a fourth diode, a fifth diode and a sixth diode, a switch voltage-boosting unit which consists of a first capacitor, a first diode, a second diode and an MOS transistor S, a quasi-Z-source unit which consists of a third inductor, a second capacitor, a third capacitor and a third diode, a three-phase inverter bridge, an output filtering inductor, a filtering capacitor and a load. The overall circuit combines the single-level voltage-boosting/voltage-bucking characteristics of each of the voltage-boosting unit and the quasi-Z-source unit as well as the characteristic of the parallel charge and series discharge of the switch capacitor, and has a higher output voltage gain; the output and the input are common-grounded, so that the voltage stress of the switching device in the inverter bridge is reduced; and in addition, the circuit is free of starting impact current and impact current in the switch-on moment of the switching tube.

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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/537H02M3/155
CPCH02M3/155H02M7/537H02M1/0067
Inventor 张波朱小全丘东元
Owner SOUTH CHINA UNIV OF TECH
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