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Buck-boost switch circuit and its control method

A switch circuit and boost control technology, applied to electrical components, conversion equipment without intermediate conversion to AC, output power conversion devices, etc., can solve problems such as the complex circuit structure of the buck-boost switch circuit 10, and achieve mode switching Convenience, good stability, simple circuit structure and loop effect

Active Publication Date: 2017-05-17
CHENGDU MONOLITHIC POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practical applications, the circuit structure of the buck-boost switch circuit 10 is very complicated.

Method used

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  • Buck-boost switch circuit and its control method
  • Buck-boost switch circuit and its control method
  • Buck-boost switch circuit and its control method

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Embodiment Construction

[0027] Specific embodiments of the present invention will be described in detail below, and it should be noted that the embodiments described here are only for illustration, not for limiting the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one of ordinary skill in the art that these specific details need not be employed to practice the present invention. In other instances, well-known circuits, materials or methods have not been described in detail in order to avoid obscuring the present invention.

[0028] Throughout this specification, reference to "one embodiment," "an embodiment," "an example," or "example" means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in the present invention. In at least one embodiment. Thus, appearances of the phrases "in on...

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Abstract

The present invention provides a buck-boost switch circuit, which adopts a fixed-duration on-circuit or a fixed-duration off-circuit to control switches in the buck-boost switch circuit. The buck-boost switch circuit: in the buck mode, a fixed-duration conduction circuit or a fixed-duration shutdown circuit is used to control the buck switch pair; in the boost mode, a fixed-duration conduction circuit or a fixed-duration shutdown circuit is adopted Control the boost switch pair; in the buck-boost mode, a fixed-duration on-circuit or fixed-duration off-circuit is used to control the buck switch pair and the boost switch pair at the same time; thereby adjusting the input end of the buck-boost switch circuit to the output end energy transfer. The buck-boost switch circuit provided by the invention does not need to use a loop compensation circuit, and the circuit structure is simple. At the same time, the buck-boost switch circuit provided by the present invention is convenient to switch between each working mode, can realize seamless connection of the working modes, and has better transient characteristics.

Description

technical field [0001] The present invention relates to an electronic circuit, and more specifically, the present invention relates to a switch circuit and a control method thereof. Background technique [0002] The buck-boost switching circuit has three working modes: boost mode, buck mode and buck-boost mode. Normally, when the input voltage is higher than the output voltage, the buck-boost switching circuit works in buck mode; when the input voltage is lower than the output voltage, the buck-boost switching circuit works in boost mode; when the input voltage and output voltage When close, the buck-boost switch circuit works in the buck-boost mode. [0003] figure 1 A conventional buck-boost switching circuit 10 is shown. The buck-boost switch circuit 10 includes: a first power switch PA and a second power switch PB coupled between the input voltage Vin and ground; a third power switch PC and a fourth power switch PD coupled between the output voltage Vout and between ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/10H02M1/14
CPCH02M3/1582H02M1/0022
Inventor 欧阳茜
Owner CHENGDU MONOLITHIC POWER SYST
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