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A power regulation system with overvoltage protection independent of output voltage and its protection method

An overvoltage protection circuit and power regulation technology, which is applied in control/regulation systems, output power conversion devices, and regulation of electrical variables, can solve problems such as power loss in the power regulation system, damage to the power regulation system, and large electrostatic discharge structures.

Active Publication Date: 2011-09-07
TEXAS INSTR INC
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Problems solved by technology

However, monitoring the output voltage of the power conditioning system may cause power loss in the power conditioning system because the overvoltage protection circuit draws / extracts power from the output voltage of the power conditioning system
Also, this overvoltage protection system may require one or more dedicated pins on the IC where the power regulation system resides, since the output voltage cannot be supplied directly from the IC
Also, by providing a pin on the IC corresponding to the output voltage, a large ESD structure may be required to prevent damage to the power regulation system from large magnitudes of the output voltage within the acceptable range of the output voltage

Method used

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  • A power regulation system with overvoltage protection independent of output voltage and its protection method
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  • A power regulation system with overvoltage protection independent of output voltage and its protection method

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Embodiment Construction

[0011] This invention relates to electronic circuits, and more particularly to output voltage independent overvoltage protection. The power regulator periodically generates switching signals used to regulate the current flowing through the load inductor. As an example, the switching signal controls a power switch, which activation diverts current through the inductor from the output load to ground, thus regulating the output voltage. The switching signal is provided to an overvoltage protection circuit configured to sample / sample the switching signal voltage. Specifically, the overvoltage protection circuit generates a pulse signal based on a rising edge of the switch signal. The pulse signal is delayed to generate one or more delayed pulses which activate respective / respective one or more sample-and-hold switches. As an example, a first switch may be activated to set an intermediate voltage whose magnitude is related to the maximum voltage of the switch signal, and a second...

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Abstract

A power regulation system (10) with overvoltage protection independent of output voltage and its protection method. The system (10) includes a power regulator (16) configured to periodically generate a switch signal that regulates a current flowing through an inductor (12) to set a magnitude of an output voltage, and an overvoltage protection circuit (18) configured to monitor a peak voltage magnitude of the switch signal and to generate an overvoltage indication signal in response to the peak voltage magnitude of the switch signal exceeding a predetermined limit.

Description

technical field [0001] This invention relates to electronic circuits, and more particularly to output voltage independent overvoltage protection. Background technique [0002] Linear voltage regulators and switch-mode voltage regulators form the basic building blocks of today's power management integrated circuits (ICs). One such type of regulator is known as a switching regulator or switching power supply, which controls the flow of energy to a load by controlling the switching duty cycle of one or more power switches coupled to the load. As an example, a switching regulator may be located in an integrated circuit (IC) such that an external feedback resistor and an external sense power supply are coupled to the switching regulator to provide a regulated / regulated potential on the inductor output. [0003] It is often important to protect the power regulator and associated external circuitry (such as the circuits to which the power regulator provides power) from damage caus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155
CPCH02M3/156H02M1/32
Inventor J·徐J·梁J·勾
Owner TEXAS INSTR INC
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