Large-transformation-ratio wide-input step-down circuit and device

Abstract

The invention provides a large-transformation-ratio wide-input step-down circuit and device. The circuit comprises a power supply, a first switch loop, a first low-pass filter circuit, a second switchloop, a second low-pass filter circuit and a load. The power supply is electrically connected with the first low-pass filter circuit through the first switch loop, the first low-pass filter circuit is electrically connected with the second low-pass filter circuit through the second switch loop, and the second low-pass filter circuit is electrically connected with the load, wherein the first switch loop is used for carrying out on-off control according to the ratio of power supply voltage to load voltage. Based on the invention, according to the transmission ratio requirement of the voltage, the first switch loop performs switching work, and so when the input voltage changes in a large range, a system can maintain efficient electric energy conversion and stable voltage output to supply power to the load.

Description

technical field [0001] The invention relates to the field of step-down choppers, in particular to a large variable ratio wide input step-down circuit and device. Background technique [0002] With the continuous development of science and technology, higher requirements are put forward for the efficiency, power density and reliability of DC / DC converters. In the existing technology, two bucks are cascaded to form a large drop-down of the D2 buck structure. In the voltage ratio circuit, one of the switch tubes is simplified into a diode. By increasing the duty cycle of the switching tube, the working condition of the buck circuit when the input and output pressure difference is large is improved. It consists of a switch tube S2, three diodes, two inductors, and capacitors. The basic circuit structure is as follows: figure 1 shown. When the input and output pressure difference of the classic buck step-down chopper circuit is large, the duty cycle of the switch tube is too s...

AI Technical Summary

Problems solved by technology

When the input and output pressure difference of the classic buck step-down chopper circuit is large, the duty cycle of the switch tube is too small, which reduces the efficiency of power conversion and even affects the stability of the system. When it is large, the working performance is not as good as the classic buck circuit

Therefore, in the face of wide input voltage, neither of them can match well

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