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Electrostatic protection circuit of car-mounted terminal

An electrostatic protection, vehicle terminal technology, applied in emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, circuit devices, etc., can solve the problems of limited protection, single protection circuit, complicated circuit and so on , to achieve the effect of simple structure

Inactive Publication Date: 2014-03-05
CHENGDU JINGLIN ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Nowadays, electrostatic protection plays an increasingly important role in daily life. The circuits of vehicle-mounted terminal products are intricate and complex, and relying on a single protection circuit can only play a limited role in protection.

Method used

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  • Electrostatic protection circuit of car-mounted terminal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] see figure 1 , the vehicle terminal electrostatic protection circuit, including a MOS transistor A3 connected to the ground wire, and a MOS transistor B4 connected to the power line, the gate and source of the above-mentioned MOS transistor A3 are coupled together and connected to the ground wire, and the gate It is connected to the first wire 501 connected to the port 1, the source is also connected to the third wire 503 connected to the internal circuit 2, and the drain of the MOS transistor A3 is connected to the second wire 502 connected to the internal circuit 2; the MOS transistor The gate and source of B4 are coupled together and connected to the power line, a diode is connected between the power line and the third wire 503, the gate of the MOS transistor B4 is connected to the first wire 501 of the connection port, The drain of the MOS transistor B4 is connected to the second wire 502 connected to the internal circuit 2 .

[0021] A diode 8 is also connected be...

Embodiment 2

[0024] see figure 1 , similar to Example 1, the difference is:

[0025] Capacitors are connected between the port 1 and the ground wire, port 1 and the power line, and the capacitors are used to couple the AC signal to the gate of the MOS transistor.

[0026] The above-mentioned first wire 501 is also connected with a resistor 6, and the resistor 6 functions as an electrostatic current limiter.

[0027] The aforementioned MOS transistor A3 is an N-type MOS transistor.

[0028] The above-mentioned MOS transistor B4 is a P-type MOS transistor.

[0029] There is also a MOS transistor C7 connected in parallel close to the internal circuit 2, which plays the role of secondary protection of the internal circuit.

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PUM

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Abstract

The invention discloses an electrostatic protection circuit of a car-mounted terminal. The electrostatic protection circuit is connected between a port and an internal circuit and comprises a MOS A and a MOS B, wherein the MOS A is connected with an earth line, and the MOS B is connected with a power line. Because the MOS A and the MOS B are connected between the port and the earth line and between the port and the power line respectively and the earth line is connected with the power line through a diode, current can flow away only through the earth line and can be prevented from flowing into the car-mounted terminal to damage internal circuit components of the car-mounted terminal, and accordingly the dual protection effect is achieved. The electrostatic protection circuit is simple in structure and provides dual guarantees for electrostatic protection of the car-mounted terminal.

Description

technical field [0001] The invention relates to a protection circuit, in particular to an electrostatic protection circuit for a vehicle-mounted terminal. Background technique [0002] Vehicle-mounted terminal The vehicle-mounted terminal is the front-end equipment of the vehicle monitoring and management system. It is generally installed secretly in various vehicles. The vehicle-mounted terminal equipment is mainly composed of vehicle-mounted video servers, LCD touch screens, external cameras, call handles, car anti-theft devices and other external devices. . [0003] Vehicle-mounted terminals can also be called vehicle dispatching and monitoring terminals (TCU terminals). Users can monitor and manage vehicles through computers and mobile phones. [0004] Nowadays, electrostatic protection plays an increasingly important role in daily life. The circuits of vehicle-mounted terminal products are intricate and complex, and relying on a single protection circuit can only play...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/00
Inventor 殷刚
Owner CHENGDU JINGLIN ELECTRONICS TECH
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