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A Bootstrap Driving Circuit for Four-Switch Buck-Boost Converter

A bootstrap drive circuit, buck-boost converter technology, applied in the direction of converting DC power input to DC power output, instruments, electrical components, etc., can solve problems such as unfavorable chip integration, large chip size, etc.

Active Publication Date: 2021-05-11
深圳芯智汇科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, integrating the charge pump in the chip needs to consume a large chip volume, which is not conducive to improving the integration of the chip.

Method used

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  • A Bootstrap Driving Circuit for Four-Switch Buck-Boost Converter
  • A Bootstrap Driving Circuit for Four-Switch Buck-Boost Converter
  • A Bootstrap Driving Circuit for Four-Switch Buck-Boost Converter

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Embodiment Construction

[0028] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.

[0029] Wherein, the accompanying drawings are only for illustrative purposes, showing only schematic diagrams, rather than physical drawings, and should not be construed as limitations on this patent; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings will be omitted, Enlargement or reduction does not represent the size of the actual product; for those skilled in the art, it is understandable that certain known structures and their descriptions in the drawings may be omitted.

[0030] In the drawings of the embodiments of the present invention, the same or similar symbols correspond to the same or similar components; , "inner", "outer" and other indicated orientations or positional relationships are based on the orientations or positional ...

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PUM

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Abstract

The invention discloses a bootstrap driving circuit suitable for a four-switch buck-boost converter, which includes a buck-boost circuit and a bootstrap capacitor mutual charging circuit connected in parallel between BST1 and BST2 of the buck-boost circuit , the bootstrap capacitor charging circuit includes a first bootstrap capacitor charging circuit and a second bootstrap capacitor charging circuit, the first bootstrap capacitor C1 in the buck-boost circuit can be charged by the first bootstrap capacitor The circuit charges the second bootstrap capacitor C2, and the second bootstrap capacitor C2 in the buck-boost circuit can charge the first bootstrap capacitor C1 through the second bootstrap capacitor charging circuit. The present invention realizes two The mutual charging of the bootstrap capacitors reduces the switching action required for charging the traditional four-switch buck-boost circuit, and indirectly reduces the inductor current ripple.

Description

technical field [0001] The invention relates to a bootstrap drive circuit, in particular to a bootstrap drive circuit suitable for a four-switch buck-boost converter. Background technique [0002] In the topological structure of the switching power supply, there are three typical topological structures of buck, boost, and buck-boost. These three traditional topologies require only two switching tubes at most. The buck circuit can only step down, the boost circuit can only boost the voltage, and the buck-boost circuit structure can both boost and step down, but the input and output are reversed. So if figure 2 The buck-boost structure of four switches is further derived as shown. In order to improve efficiency, the four switch tubes are all NMOS tubes. The high-side NMOS switch tubes need to use bootstrap drive technology. Release and gradually become smaller. [0003] Such as figure 2 As shown, in the traditional four-switch buck-boost circuit structure, taking the inp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/158
CPCH02M3/1584
Inventor 付烟林郭帅朱治鼎王蒙
Owner 深圳芯智汇科技有限公司
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