Switch capacitor type quasi switch boosting DC-DC converter

Abstract

The invention provides a switch capacitor type quasi switch boosting DC-DC converter. The switch capacitor type quasi switch boosting DC-DC converter mainly comprises an input direct-current voltage source, a quasi switch boosting network, a switch capacitor network, a second MOS tube, a third diode, a fourth capacitor and a load resistor, wherein the quasi switch boosting network consists of a first inductor, a first capacitor, a first diode, a second diode and a first MOS tube; and the switch capacitor network consists of a second capacitor, a fourth diode, a third capacitor and a fifth diode. The whole circuit is simple in structure, current of a power supply is continuous, input and output are in common-ground, and the characteristic of single-stage boosting and reducing of the quasi switch boosting network and the characteristics of parallel charging and serial discharging of the switch capacitor are combined, so that the switch capacitor type quasi switch boosting DC-DC converter has high output voltage gain. A circuit does not have start impact current or impact current at the moment of switch-on of a switch tube.

Description

technical field [0001] The invention relates to the technical field of power electronic converters, in particular to a switched capacitor quasi-switch step-up DC-DC converter. Background technique [0002] In recent years, with the increasing consumption and depletion of traditional fossil energy sources (such as coal, oil, etc.), it is imperative to explore, research and develop new clean and renewable energy sources. Furthermore, the research on solar photovoltaic power generation, fuel cell and other renewable energy grid-connected power generation technologies has been paid more and more attention. However, since the output voltage of a single fuel cell and photovoltaic solar panel is often relatively low, a DC-DC converter with a higher output voltage gain is usually required as an interface converter to convert the lower battery voltage to a high enough voltage to meet grid connection requirements. The inverter interfaces with the DC voltage and then generates power i...

AI Technical Summary

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 ratio, but due to the influence of parasitic parameters, its output voltage gain is limited; another example is the Z-source DC converter, its voltage gain is 1 / (1-2D), which has a certain improvement compared with the Boost converter, but still by There is a lot of room for improvement. In addition, it also has problems such as input and output not sharing ground, high switching voltage stress, etc.

Images