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Protection circuit of vehicle terminal

A technology for protecting circuits and vehicle-mounted terminals, which is applied in the field of circuits and can solve problems such as the MCU being easily damaged and increasing maintenance costs

Pending Publication Date: 2018-03-16
FUJIAN XINGHAI COMM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the internal environment of the car is harsh, high voltage or static electricity is input from the AD sampling port, and the AD sampling input port of the MCU itself has no protection measures, making the MCU easy to be damaged and increasing maintenance costs

Method used

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  • Protection circuit of vehicle terminal

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Embodiment Construction

[0011] see figure 1 As shown, the present invention is a protection circuit for a vehicle-mounted terminal, the vehicle-mounted terminal includes a vehicle-mounted interface and an MCU, the protection circuit includes a resistor R1, a resistor R2, and an operational amplifier; one end of the resistor R1 is connected to the vehicle-mounted interface, The other end of the resistor R1 is connected to the anode of the operational amplifier, the cathode of the operational amplifier is short-circuited to the output and then connected to the MCU; one end of the resistor R2 is connected to the resistor R1 and the operational amplifier Between the cathodes of the resistors, the other end of the resistor R2 is grounded, the power supply terminal of the operational amplifier is connected to the power supply terminal of the MCU, and the ground terminal of the operational amplifier is grounded. Voltage division and current limiting are performed through resistors and operational amplifiers...

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Abstract

The invention provides a protection circuit of a vehicle terminal. The vehicle terminal comprises a vehicle interface and an MCU (Microprogrammed Control Unit); the protection circuit comprises a resistor R1, a resistor R2 and an operational amplifier; one end of the resistor R1 is connected to the vehicle interface; the other end of the resistor R1 is connected to an anode of the operational amplifier; a cathode of the operational amplifier is in short circuit with an output end so as to be connected to the MCU; one end of the resistor R2 is connected between the resistor R1 and the cathode of the operational amplifier; the other end of the resistor R2 is grounded; a power supply end of the operational amplifier is connected to a power supply end of the MCU; a ground terminal of the operational amplifier is grounded. The resistors and the operational amplifier are used for dividing voltage and limiting current, so that the MCU of the vehicle terminal is further protected.

Description

technical field [0001] The invention relates to a circuit, in particular to a protection circuit for a vehicle-mounted terminal. Background technique [0002] The vehicle-mounted terminal needs to be adapted to various sensors, which are transmitted to the MCU through the vehicle-mounted interface, and the data is collected by the AD sampling port of the MCU. However, the internal environment of the vehicle is harsh, high voltage or static electricity is input from the AD sampling port, and the AD sampling input port of the MCU itself has no protection measures, which makes the MCU easy to be damaged and increases maintenance costs. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a protection circuit for a vehicle-mounted terminal. A protection circuit is added between the interface of the vehicle-mounted terminal and the MCU, which can effectively prevent damage to the vehicle-mounted terminal by high voltage an...

Claims

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Application Information

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IPC IPC(8): H02H9/02H02H9/04
CPCH02H9/02H02H9/045H02H9/047
Inventor 江正锈张代祥周毅
Owner FUJIAN XINGHAI COMM TECH
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