Switch capacitance type hybrid quasi-Z source converter

Abstract

The invention provides a switch capacitance type hybrid quasi-Z source converter. The converter comprises an input direct-current voltage source, a hybrid quasi-Z source network, a switch capacitance network, a second MOS transistor, a third diode, a fifth capacitor and a loading resistor. The hybrid quasi-Z source network is composed of a first inductor, a second inductor, a first capacitor, a second capacitor, a first diode, a second diode and a first MOS transistor. The switch capacitance network is composed of a third capacitor, a fourth diode, a fourth capacitor and a fifth diode. A whole circuit is simple in structure, the input end and the output end are commonly grounded, and the single-stage buck-boost characteristic of the hybrid quasi-Z source network and the switch capacitance parallel charging and series discharging are combined, so that the converter has higher output voltage gain, and start impulse current and impulse current generated at the moment that a switching tube is switched on do not exist in the circuit.

Description

technical field [0001] The invention relates to the technical field of power electronic converters, in particular to a switched capacitor type hybrid quasi-Z source converter. Background technique [0002] With the massive consumption of fossil energy such as coal and oil and the increasing environmental pollution, it is becoming more and more important to develop and utilize new renewable clean energy such as solar photovoltaics and fuel cells. Among them, high-gain DC / DC converters are widely used in new energy power generation systems because they can greatly increase the corresponding DC voltage level. However, in some other industrial applications, such as high-pressure gas discharge lamps, X-ray film machine DC power supply, etc., high-gain DC / DC converters also have important application values. However, many step-up DC / DC converters cannot achieve a large boost due to the limitation of duty cycle, heat generation and loss. For example, the Boost converter has a volt...

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Problems solved by technology

However, many step-up DC / DC converters cannot achieve a large boost due to the limitation of duty cycle, heat generation and loss. For example, the Boost converter has a voltage gain of 1 / (1-D), and D is the duty Due to the influence of parasitic parameters, the output voltage gain is limited; for example, the Z-source step-up DC-DC converter proposed in recent years has a voltage gain of 1 / (1-2D), which is higher than that of the Boost converter. However, there is still a lot of room for improvement in its voltage gain. In addition, it also has problems such as input and output not sharing ground, high switch voltage stress, etc.

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