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Input overvoltage protection circuit applied to integrated circuits

A technology of overvoltage protection circuit and integrated circuit, which is applied in the direction of emergency protection circuit device, protection that responds to overvoltage, emergency protection device that automatically disconnects, etc., and can solve the problem of incomplete solutions, high cost, and incomplete solutions Solutions and other issues, to achieve the effect of complete system security and low cost

Active Publication Date: 2019-03-26
SG MICRO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But all these are temporary, incomplete solutions, costly, and not perfect solutions

Method used

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  • Input overvoltage protection circuit applied to integrated circuits
  • Input overvoltage protection circuit applied to integrated circuits

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Embodiment Construction

[0020] Below with the accompanying drawings ( Figure 1-Figure 2 ) to illustrate the present invention.

[0021] figure 1 It is a schematic diagram of an input overvoltage protection circuit applied to integrated circuits implementing the present invention. figure 2 It is a schematic diagram of the waveforms of VIN, VCC, and OVP in different stages. Such as Figure 1 to Figure 2 As shown, the input overvoltage protection circuit applied to integrated circuits includes an integrated circuit chip 2, and the integrated circuit chip 2 has a protected chip circuit 1, and an external overvoltage protection MOS is provided outside the integrated circuit chip 2. The switch tube, the external overvoltage protection MOS switch tube is located between the external input voltage terminal VIN and the protected chip circuit power supply voltage terminal VCC. The external overvoltage protection MOS switch tube is a third NMOS tube M3, the drain of the third NMOS tube M3 is connected to ...

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Abstract

In an input overvoltage protection circuit applied to an integrated circuit, a high voltage is disconnected by a metal oxide semiconductor (MOS) switch tube which is externally arranged in an integrated circuit chip so that the high voltage is prevented from being directly input to damage a circuit in the chip, and overvoltage protection of the circuit in the chip is achieved. The input overvoltage protection circuit is characterized by comprising the integrated circuit chip, a protected chip circuit is arranged in the integrated circuit chip, and an externally-arranged overvoltage protection MOS switch tube is arranged outside the integrated circuit chip and is arranged between an external input voltage end and a power supply voltage end of the protected chip circuit.

Description

technical field [0001] The present invention relates to the overvoltage protection of the integrated circuit chip, especially an input overvoltage protection circuit applied to the integrated circuit, which cuts off the high voltage through the MOS switch tube placed outside the integrated circuit chip to avoid direct input of high voltage and damage the internal circuit of the chip , so as to realize the overvoltage protection of the internal circuit of the chip. Background technique [0002] Due to the application of batteries and electric vehicles, and the development of new power technology GaN and SIC, the voltage range that semiconductors can handle is getting higher and higher. Even UL certification has increased the safe working voltage to 60V. Industrialization 4.0 puts forward strict requirements on the automation and reliability of industrial control systems. This type of high-voltage direct current may be generated by the front-end AC-DC power supply open loop,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/20H02H3/20H02H3/06
CPCH02H3/06H02H3/20H02H7/20
Inventor 李志林谭磊王宇
Owner SG MICRO
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