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Anti-interference protective circuit

A protection circuit and anti-interference technology, which is applied to emergency protection circuit devices, circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., and can solve problems such as mutual interference of different circuit signals, impact damage of chip devices, etc.

Inactive Publication Date: 2013-09-25
CHENGDU RUIYI INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the communication process, multiple signals are usually multiplexed on the same interface for practical needs. Multiple signals appear on the same physical interface. The same physical interface can be used as an output interface for a certain signal interface or as an output interface. When the other signal interface is also used as an input interface, it is inevitable that there will be mutual interference between different circuit signals, and the impact of high-voltage and high-current signals will cause physical damage to the chip device.

Method used

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Embodiment

[0016] Such as figure 1 As shown, the present invention includes a signal input port, a resistor R1, a resistor R2, a resistor R3, a transistor T1, a diode D1 and a chip receiving pin, and the signal input port can receive 9V / 10mA, 5V / 500mA and normal UART communication signals. In this embodiment, the signal input port, resistor R1, transistor T1 and resistor R3 are connected in series in sequence, the resistor R3 is connected to the emitter E of the transistor T1, the base set B of the transistor T1 is connected to the cathode of the diode D1, and the collector C of the transistor T1 Grounded, the withstand voltage value of the base set B of the triode T1 is 5V. The resistor R2 is connected in parallel with the transistor T1, and the receiving pin of the chip is connected to the emitter E of the transistor T1. In this embodiment, the diode D1 is connected in parallel with the resistor R1 and the anode of the diode D1 is grounded. The diode D1 is a Zener diode, and the stabi...

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Abstract

The invention discloses an anti-interference protective circuit. The anti-interference protective circuit comprises a signal input port, a resistor R1, a resistor R2, a resistor R3, a triode T1, a diode D1 and a chip receiving pin. The signal input port, the resistor R1, the resistor R3 and the triode T1 are sequentially in series connection, the resistor R3 is connected to an emitter E of the triode T1, the resistor R2 is in linkage with the triode T1, the chip receiving pin is connected to the emitter E of the triode T1, the diode D1 is in parallel connection with the resistor R1, and the positive pole of the diode D1 is connected with the ground. By means of the structure, the anti-interference protective circuit avoids physical damage to a chip device caused by impact of a signal with high voltage and a large current.

Description

technical field [0001] The invention relates to a multiplexing signal interface, in particular to an anti-interference protection circuit. Background technique [0002] UART communication is a serial data bus transmission communication, which converts the received parallel data into serial data for transmission, and is mainly used for asynchronous communication. The bus bidirectional communication, can realize full-duplex transmission and reception. In embedded design, UART is used for communication between host and auxiliary equipment, such as communication between car audio and external AP and communication with PC. Among them, PC communication includes communication with monitoring debugger and other devices. In the communication process, multiple signals are usually multiplexed on the same interface for practical needs. Multiple signals appear on the same physical interface. The same physical interface can be used as an output interface for a certain signal interface o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/02H02H9/04
Inventor 汪磊
Owner CHENGDU RUIYI INFORMATION TECH
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