A four-switch single-phase single-stage switching boost inverter

Abstract

The invention discloses a four-switch single-phase single-stage switch boosting inverter circuit, which belongs to the technical field of power generation, transformation or distribution. The circuit includes: a first boost circuit composed of a first inductor, a first diode, a first capacitor, and a second diode; a second inductor, a second capacitor, a third diode, and a fourth diode and a second boost circuit composed of an inverter bridge, and an output circuit composed of a filter capacitor and a load. The whole circuit structure is simple, the input current of the power supply is continuous, combined with the single-stage buck-boost characteristics of the switched inductor-capacitor unit and the quasi-switch boost network, it has higher output voltage gain, continuous load current, and has direct and open-circuit immunity. It can work in a straight-through state, and the circuit does not have a start-up inrush current and an inrush current at the moment the switch tube is turned on.

Description

technical field [0001] The invention relates to power electronic circuit technology, in particular to a four-switch single-phase single-stage switching boost inverter, which belongs to the technical field of power generation, transformation or distribution. Background technique [0002] In new energy power generation systems such as photovoltaic power generation and fuel cells, due to the low DC voltage provided by a single solar cell and fuel cell, it cannot meet the electricity demand of existing electrical equipment. voltage wide-gain converter. The traditional method is to use multiple Boost converters to cascade to boost the voltage. This method is expensive and uses a large number of devices, which will cause a decrease in system stability and reliability; the second is to introduce a Z source between the input source and the load. Impedance network, through the cascading of multi-level quasi-Z source impedance network can output very high voltage gain, however, the c...

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Problems solved by technology

[0002] In new energy power generation systems such as photovoltaic power generation and fuel cells, due to the low DC voltage provided by a single solar cell and fuel cell, it cannot meet the electricity demand of existing electrical equipment. Wide Gain Converter for Voltage

The traditional method is to use multiple Boost converters to cascade to boost the voltage. This method is expensive and uses a large number of devices, which will cause a decrease in system stability and reliability; the second is to introduce a Z source between the input source and the load. Impedance network, through the cascading of multi-level quasi-Z source impedance network can output very high voltage gain, however, the cascading of multiple quasi-Z source units increases the number of passive components such as inductors and capacitors in the circuit topology, making The weight, volume, and cost of the system are greatly increased, which limits the application of the circuit in low-power circuits that are limited by system cost, weight, and volume.

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