A DC boost converter and system based on switched capacitor inductance

Abstract

The invention discloses a direct-current boost converter based on switched capacitance and inductance. The direct-current boost converter comprises a common switch tube, a direct-current voltage source and n serially-connected switched capacitance and inductance units; and the switched capacitance and inductance units comprise a first inductor, a first capacitor, a second capacitor, a first diode, a second diode and a third diode. The reason why the direct-current boost converter based on switched capacitance and inductance has relatively high voltage gain is that the voltage gain can be changed by changing the quantity of the switched capacitance and inductance units and the voltage gain can also be regulated by controlling the conduction duty ratio of the common switch tube. Therefore, the limitations brought about by the voltage gain improved depending on the duty ratio purely in the prior art can be overcome, the structure is simple, and the used device is relatively low in cost.

Description

technical field [0001] The invention relates to the technical field of converters, in particular to a DC boost converter and system based on switched capacitor inductance. Background technique [0002] With the development and popularization of distributed power generation systems such as photovoltaic power generation and fuel cells, DC converters with high step-up ratios are receiving more and more attention. For a boost converter, its voltage gain is an important parameter. [0003] In the prior art, in order to increase the voltage gain, there are usually the following two methods, one is to increase the duty cycle of the boost converter, that is, when the duty cycle of the boost converter is large enough, a high voltage gain can be achieved ; Another method is to use a transformer or coupled inductor with a high turns ratio to achieve. [0004] Among the above two methods, the duty ratio of the boost converter is usually not greater than 0.8 due to the limitation of th...

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Problems solved by technology

[0004] Among the above two methods, the duty ratio of the boost converter is usually not greater than 0.8 due to the limitation of the voltage and current pressure and loss of the device in the former, and it is limited to increase the voltage gain by relying solely on the duty ratio; the latter Or because the design of high turns ratio transformers and coupled inductors is difficult and the loss is large, therefore, it cannot meet the actual needs

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