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A surge protection circuit and chip

A surge protection and circuit technology, applied in emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, circuit devices, etc., can solve the problem of large temperature coefficient of VIN clamping voltage and surge tolerance. Problems such as poor ability and weak VIN clamping voltage adjustability, to achieve the effects of stable temperature coefficient, strong surge tolerance, and continuous adjustment of clamping voltage

Active Publication Date: 2022-02-18
CELLWISE MICROELECTRONICS CO LTD DONGGUAN
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AI Technical Summary

Problems solved by technology

[0002] The currently commonly used surge protection circuit uses several Zener diodes and several diodes plus the threshold voltage of the power tube as the preset locking voltage, but in the integrated circuit environment, Zener diodes have a positive temperature coefficient, and the series connection The larger the number, the larger the temperature coefficient, resulting in a larger temperature coefficient of the VIN clamping voltage, the VIN clamping voltage increases with the current, the greater the change, the weaker adjustability of the VIN clamping voltage leads to poor surge withstand capability, Therefore, the existing surge protection circuit needs to be improved

Method used

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  • A surge protection circuit and chip
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  • A surge protection circuit and chip

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Embodiment Construction

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0023] See figure 1 , is a structural schematic diagram of an embodiment of the surge protection circuit of the present invention, specifically including: a power transistor P, a multi-stage control branch 11 and a voltage divider circuit 12 . Wherein, the power transistor P is arranged between the input terminal IN and the ground voltage GND. The multi-level control branches 11 are respectively arranged between the input terminal IN and the grou...

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Abstract

The invention provides a surge protection circuit and a chip, comprising: a power tube, which is arranged between the input terminal and the ground voltage; a multi-level control branch, which is arranged between the input terminal and the ground voltage, and the latter-level control branch is connected to The control terminal of the upper-level control branch provides control voltage to the upper-level control branch when the latter-level control branch is turned on, and determines whether the upper-level control branch is turned on; the first-level control branch is connected to the power tube The control terminal of the power tube provides the first control voltage to the power tube when the first-stage control branch is turned on to determine whether the power tube is turned on; the voltage dividing branch is set between the input terminal and the control terminal of the power tube, and is connected to the last The first-stage control branch generates a divided voltage based on the input voltage of the input terminal and the first control voltage of the control terminal of the power tube, and provides it to the last-stage control branch to determine whether the last-stage control branch is turned on. The temperature coefficient of the VIN clamping voltage of the circuit is stable, the clamping voltage can be adjusted continuously, and the surge tolerance is strong.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a surge protection circuit and a chip. Background technique [0002] The currently commonly used surge protection circuit uses several Zener diodes and several diodes plus the threshold voltage of the power tube as the preset locking voltage, but in the integrated circuit environment, Zener diodes have a positive temperature coefficient, and the series connection The larger the number, the larger the temperature coefficient, resulting in a larger temperature coefficient of the VIN clamping voltage, the VIN clamping voltage increases with the current, the greater the change, the weaker adjustability of the VIN clamping voltage leads to poor surge withstand capability, Therefore, the existing surge protection circuit needs to be improved. Contents of the invention [0003] The invention provides a surge protection circuit and a chip. The surge protection circuit VIN...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/04
CPCH02H9/04
Inventor 朱炜礼赵建华
Owner CELLWISE MICROELECTRONICS CO LTD DONGGUAN
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