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Regulator overvoltage protection circuit with reduced standby current

A regulator and circuit technology, applied in the direction of regulating electrical variables, control/regulating systems, instruments, etc., can solve problems such as high standby current and consumption

Active Publication Date: 2015-09-09
STMICROELECTRONICS (SHENZHEN) R&D CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Overvoltage comparators that may be included in the circuit to detect overshoot voltages typically consume relatively high levels of standby current

Method used

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  • Regulator overvoltage protection circuit with reduced standby current
  • Regulator overvoltage protection circuit with reduced standby current
  • Regulator overvoltage protection circuit with reduced standby current

Examples

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Embodiment Construction

[0015] The implementation and utilization of the example embodiments are discussed in detail below. It should be understood, however, that the specific embodiments discussed are examples only and do not limit the scope of the invention.

[0016] The present disclosure will be described with reference to example embodiments, such as a circuit and method for altering the response time of an error amplifier in a linear regulator in response to detecting a current level crossing a threshold level.

[0017] An embodiment of the present disclosure may also be applied to other power converter arrangements, such as power converters formed with switched-mode power conversion topologies. More error amplifier arrangements, such as power converters used to control the speed of motors or power amplifiers configured to amplify audio signals, can be constructed and applied using the inventive concepts described herein using the processes presented here in different contexts.

[0018] now re...

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PUM

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Abstract

An embodiment of the invention relates to a power converter formed with an error amplifier and a related method. In an embodiment, a first switch is coupled in series with an error amplifier compensation capacitor. Upon detection of a current level greater than a threshold level, the compensation capacitor is decoupled from the error amplifier by opening the first switch. In an embodiment, a second switch is coupled in parallel with the compensation capacitor, and the current-sensing circuit enables conductivity of the second switch to discharge the compensation capacitor upon detection of the current level greater than the threshold level. The second switch is opened upon detection of the current level less than the threshold level. In an embodiment, the current-sensing circuit controls an output current of the power converter at a current-limit level upon detection of the internal current level greater than the threshold level.

Description

technical field [0001] The present disclosure relates generally to electronic power conversion, and more particularly to reducing the bias current levels required for error amplifiers in power converters and related methods. Background technique [0002] A power converter (also called a "voltage regulator") is a power supply or power processing circuit that converts an input voltage waveform into a specified output voltage waveform. A DC-DC power converter converts a direct current ("dc") input voltage to a DC output voltage. A controller associated with the power converter manages the operation of the power converter by controlling the conduction of the power switches used therein. Generally, a controller is coupled between an input and an output of a power converter in a feedback loop configuration (also referred to as a "control loop" or "closed control loop"). [0003] Typically, a controller measures an output characteristic of a power converter (eg, output voltage, o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/155H02M1/32
CPCH02M1/32H02M3/00
Inventor 林大松曾妮闸钢熊险峰张轶伟
Owner STMICROELECTRONICS (SHENZHEN) R&D CO LTD