Voltage converter and method for providing overvoltage protection therein

A voltage converter, the technology of outputting voltage, applied in the conversion equipment without intermediate conversion to AC, emergency protection circuit device, DC power input is converted to DC power output, etc. The load can not work normally, etc., to achieve the effect of system stability and reliability, and to overcome the failure of the overvoltage protection system to work normally.

Inactive Publication Date: 2012-12-26
CHENGDU MONOLITHIC POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Under some abnormal conditions, the upper tube M1 is short-circuited, and the output voltage Vout rises rapidly. At this time, the output capacitor Cout will be destroyed, and the load may not work normally or be damaged.
[0004] In order to prevent the output voltage from being too high, the traditional overvoltage protection sends the feedback signal FB of the output voltag

Method used

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  • Voltage converter and method for providing overvoltage protection therein
  • Voltage converter and method for providing overvoltage protection therein
  • Voltage converter and method for providing overvoltage protection therein

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[0024] Hereinafter, various exemplary embodiments of a voltage converter including a protection switch and a method for providing overvoltage protection in the voltage converter of the present invention will be fully described with reference to the accompanying drawings. In one embodiment, a voltage converter includes an input terminal for receiving an input voltage; an output terminal for providing an output voltage to a load; a feedback circuit including an input terminal and an output terminal, wherein the input terminal is coupled to the output terminal , The output terminal provides a feedback signal that characterizes the output voltage; a main switch circuit including a main switch for adjusting the output voltage, wherein the control terminal of the main switch receives a pulse width modulation signal, and the output voltage is affected by The duty cycle control of the pulse width modulation signal; and a protection switch having a first end, a second end and a control e...

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Abstract

The invention discloses a voltage converter and a method for providing overvoltage protection therein. The voltage converter comprises an input terminal which is used for receiving input voltages, an output terminal which is used for supplying output voltages to loads, a feedback circuit which is used for providing feedback signals representing the output voltages, a main switching circuit comprises a main switch which is used for adjusting the output voltages, and a protection switch comprises a first end coupled to the input terminal and a second end coupled to the main switching circuit. When the feedback signals are greater than a threshold signal, the protection switch is cut off, so that a voltage converter system is stable and reliable.

Description

technical field [0001] The present invention generally relates to an electronic circuit, and in particular to overvoltage protection in a voltage converter. Background technique [0002] figure 1 A schematic diagram of a DC-DC step-down (Buck) converter 100 is shown. The DC-DC step-down conversion circuit 100 includes an upper transistor M1 and a lower transistor M2. The upper transistor M1 is used as a main switch to adjust the output voltage Vout. The upper transistor M1 is coupled to the input voltage Vin. An output capacitor Cout is coupled between the output terminal and the reference ground GND. Typically, the output capacitor Cout can only withstand a limited voltage level. [0003] In some abnormal situations, the upper transistor M1 is short-circuited, and the output voltage Vout rises rapidly. At this time, the output capacitor Cout will be destroyed, and the load may not work normally or be damaged. [0004] In order to prevent the output voltage from being ...

Claims

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Application Information

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IPC IPC(8): H02M3/10H02H7/12
CPCH02M3/158H02H7/1213H02M1/32
Inventor 欧阳茜
Owner CHENGDU MONOLITHIC POWER SYST
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