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Method and circuit for overvoltage protection control of four-switch Buck-Boost converter

A technology for controlling circuits and control methods, applied in emergency protection circuit devices, converting DC power input to DC power output, electrical components, etc., can solve problems such as burning circuits and subsequent circuit damage, and achieve the effect of solving output voltage overshoot

Inactive Publication Date: 2014-03-12
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, if the output voltage overvoltage occurs and is not dealt with in time, it will cause great damage to the subsequent circuit, and in severe cases, the circuit will be burned

Method used

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  • Method and circuit for overvoltage protection control of four-switch Buck-Boost converter
  • Method and circuit for overvoltage protection control of four-switch Buck-Boost converter
  • Method and circuit for overvoltage protection control of four-switch Buck-Boost converter

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Embodiment Construction

[0037] Several preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any alternatives, modifications, equivalent methods and schemes made on the spirit and scope of the present invention. In order to provide the public with a thorough understanding of the present invention, specific details are set forth in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details.

[0038] figure 2 Shown is a circuit diagram of a four-switch Buck-Boost converter according to the present invention; its power stage circuit includes a first switch K1, a second switch K2, a third switch K3 and a fourth switch K4, and also includes an inductor L, and the connection method Same as in the prior art. The converter also in...

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Abstract

The invention discloses a method and a circuit for the overvoltage protection control of a four-switch Buck-Boost converter. First, whether overvoltage occurs in the output voltage of the converter is judged. If overvoltage exists, no matter the converter works in which mode at the moment, a first switch and a fourth switch are controlled to be turned off, and a second switch and a third switch are turned on. On one aspect, the energy input of an input end and the energy transmission of an output end are cut off. On the other aspect, energy in an inductor is consumed by an open circuit which is formed by the second switch, the inductor and the third switch. The problem that the overvoltage is output when the load suddenly changes is well solved.

Description

technical field [0001] The invention relates to the field of power electronics, more specifically, to an overvoltage protection control method and control circuit for a four-switch Buck-Boost converter. Background technique [0002] The four-switch Buck-Boost converter is widely used in the fields of electric power, communication and electronic instruments based on its advantages of reliability and high efficiency. In the prior art, the power stage circuit of the four-switch Buck-Boost converter is as figure 1 As shown, it includes four switch tubes K1, K2, K3, and K4, and also includes an inductor L, and its connection relationship is: the first switch K1, the inductor L, and the fourth switch K4 are connected in series to the input end of the converter and Between the output ends, the first end of the second switch K2 is connected to the common connection point of the first switch K1 and the inductor L, the second end is grounded, and the first end of the third switch K3 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/12
CPCH02M3/1582H02M1/32H02M3/158
Inventor 杭开郎孙良伟
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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