Terminal resistor automatic matching circuit and method

A terminal resistance and automatic matching technology, applied in impedance networks, electrical components, multi-terminal-pair networks, etc., can solve the problems of low debugging efficiency and complicated implementation of terminal resistance matching, and achieve improved debugging efficiency, light weight, and strong applicability. Effect

Pending Publication Date: 2019-05-10
XIAN XIANGXUN TECH
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Problems solved by technology

[0005] Generally, the on-board network equipment of the train will determine the resistance value of the terminal resistance for circuit mat

Method used

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  • Terminal resistor automatic matching circuit and method
  • Terminal resistor automatic matching circuit and method

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Embodiment Construction

[0026] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0027] Aiming at the network communication function involved in the motor vehicle debugging process, the invention develops a terminal resistance automatic matching circuit and an application programming interface function specially used for the motor vehicle debugging, which can be used to cooperate with the multifunctional bus test task in the motor vehicle debugging work.

[0028] Such as figure 1 As shown, the terminal resistance automatic matching circuit is the core of the present invention, and the terminal resistance automatic matching circuit is composed of a resistance network unit, a resistance control unit and a resistance measurement unit.

[0029] The resistance network unit is used to combine the corresponding terminal resistance values, the resistance control unit is used to control the combination of the resistance networks, and the r...

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Abstract

The invention provides a terminal resistor automatic matching circuit and method. The terminal resistance automatic matching circuit comprises a resistance network unit, a resistance control unit anda resistance value measuring unit, the resistance network unit is composed of M resistors connected in series, the M resistors are divided into a plurality of orders of magnitudes according to the resistance values, and each order of magnitude configures a resistor according to the mathematical law of 1, 2, 2 and 5; the resistance control unit is composed of M relays, and the M relays and the M resistors are correspondingly arranged in parallel; a corresponding resistor is connected/short-circuited by controlling disconnection/connection of the relay; the resistance measurement circuit comprises a test power supply interface and an ADC conversion circuit. wherein the test power supply interface and the resistor network unit integrally form a series loop, and the ADC conversion circuit is connected with a certain resistor in the M resistors in parallel and is used for measuring partial voltage on the resistor when a test power supply is connected so as to calculate whether the access resistance value of the terminal resistor is correct or not.

Description

technical field [0001] The invention relates to a terminal resistance automatic matching circuit and method. Background technique [0002] Nowadays, various industries in all countries in the world have entered the era of automation, and the development of automation technology and electronic computers is rapidly improving the automation of production processes. In the train production industry, a portable test equipment is also needed to complete the automatic train debugging. A large number of EMU debugging items involve network debugging. In the process of network function debugging, if the terminal resistance is not matched properly, it will cause frame loss or wrong frame of communication data. Accessing a suitable terminal resistor is an effective means proposed to solve the problem that electronic information encounters obstacles in the transmission process. [0003] When transmitting high-frequency signals, the signal wavelength is shorter than that of the transmis...

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Application Information

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IPC IPC(8): G06F13/40H03H7/40
Inventor 肖博胡珂张小莉
Owner XIAN XIANGXUN TECH
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