Quasi Z-source inverter of active switched capacitor

Abstract

The invention discloses a quasi Z-source inverter of an active switched capacitor. The quasi Z-source inverter of the active switched capacitor comprises a voltage source, a quasi Z-source unit, an active switched capacitor unit, a single-phase bridge inverter, an output filtering inductor, an output filtering capacitor and a load, wherein the quasi Z-source unit is composed of a first inductor, a second inductor, a first capacitor, a first diode and a second diode, and the active switched capacitor unit is composed of an MOS tube S, a second capacitor, a third diode and a fourth diode. According to the quasi Z-source inverter of the active switched capacitor, the high-gain property of the quasi Z-source and the property of charging in parallel and discharging in series of the active switched capacitor are combined; compared with traditional Z-source inverters, the number of inductors and capacitors used is the same, but the voltage gain is obviously improved; compared with an enhanced boost quasi Z-source inverter with a switched impedance network, the voltage gains are the same, but the number of inductors and capacitors decreases by two respectively, so that the number of passive components is greatly reduced, a higher output voltage gain is achieved with a lower duty ratio, and the power density of the system is improved.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to an active switched capacitor quasi-Z source inverter. Background technique [0002] The Z-source inverter connects an X-shaped LC impedance network between the input source and the inverter bridge, which has the unique properties of step-up and step-down, and because of its lower duty cycle than the boost converter With higher voltage gain, it is widely used in fuel cell power generation and photovoltaic power generation. The traditional Z-source inverter has defects such as discontinuous power supply current and input and output non-common ground. The quasi-Z-source inverter proposed in recent years has solved these two problems well, and through the multi-level quasi-Z source impedance The cascading of networks can achieve quite high voltage gains. However, the cascading of multi-level quasi-Z sources increases the number of passive components such as inductors and ...

AI Technical Summary

Problems solved by technology

However, the cascading of multi-level quasi-Z sources increases the number of passive components such as inductors and capacitors, which greatly increases the volume, weight and cost of the circuit, which limits the use of the circuit in terms of system volume, weight and cost. application of low power consumption circuits

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