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Over-current detection circuit and method for power switch tube

A power switch tube, overcurrent detection technology, applied in circuits, measuring electricity, measuring electrical variables and other directions, can solve problems such as reducing amplifier gain, and achieve the effect of increasing gain

Active Publication Date: 2014-02-12
FAIRCHILD SEMICON SUZHOU
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

figure 2 When the positive and negative input voltages of the amplifier shown are close to or equal to the power supply voltage, the drain and source voltages of NMOS N21 are very close, making NMOS N21 work in the linear region and reducing the gain of the amplifier

Method used

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  • Over-current detection circuit and method for power switch tube

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Embodiment Construction

[0024] The basic idea of ​​the present invention is: the sampling circuit uses the sampling MOS tube and the amplifier to sample the current of the power switch tube, converts the sampling current into a sampling voltage and transmits it to the comparison circuit, and clamps the MOS tube in series to the output terminal of the amplifier. The operating voltages of the circuit and the comparison circuit are clamped; the comparison circuit compares the magnitude of the sampling voltage and the reference voltage, and outputs an overcurrent detection result.

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] The present invention realizes an overcurrent detection circuit of a power switch tube, such as image 3 As shown, the overcurrent detection circuit of the power switch tube includes: a sampling circuit 10 and a comparison circuit 11; wherein,

[0027] The sampling circuit 10 i...

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Abstract

An overcurrent detection circuit for a power switch comprises a sampling circuit and a comparing circuit. The sampling circuit is configured to perform current sampling on the power switch using a sampling Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) and an amplifier, convert a sample current into a sample voltage and transmit the sample voltage to the comparing circuit, and clamp operating voltages of the comparing circuit and of an output circuit of the amplifier by a serially connected clamping MOSFET. The comparing circuit is configured to compare the sample voltage with a reference voltage and to output a result of overcurrent detection.

Description

technical field [0001] The invention relates to current detection technology, in particular to an overcurrent detection circuit and method of a power switch tube. Background technique [0002] The power switch tube is a power metal oxide semiconductor field effect transistor (MOS), and its turn-on and turn-off characteristics are usually used to realize high-efficiency conversion of signals and energy in switching power supplies, switching amplifiers, charge pumps, etc. When the power MOS tube is turned on, a large current usually flows through it. If the circuit passing through exceeds the tolerance limit of the power MOS tube, the power MOS tube may be permanently damaged. Therefore, in order to ensure the reliability of the power MOS tube, the current flowing through the power MOS tube must be continuously detected, and the power MOS tube can be protected from overcurrent when the flowing current is too large. [0003] figure 1 An N-type Metal Oxide Semiconductor Field ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/165
CPCG01R31/2621G01R19/16519H01L27/0285H03K17/0822G01R19/165
Inventor 黄雷
Owner FAIRCHILD SEMICON SUZHOU
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