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Method and device for PWM control signal transmission in intense electromagnetic interference environment

A strong electromagnetic interference and control signal technology, which is applied in the direction of control/regulation system, adjustment of electric variables, instruments, etc., can solve the problems that restrict the transmission safety of PWM pulse width modulation signal of DC motor used in vehicles, and meet the requirements of transmission matching, filtering and so on. The effect of eliminating strong electromagnetic interference and suppressing influence

Active Publication Date: 2016-09-28
SHAZHOU PROFESSIONAL INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Seriously restricts the safety of PWM pulse width modulation signal transmission for DC motors in vehicles

Method used

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  • Method and device for PWM control signal transmission in intense electromagnetic interference environment
  • Method and device for PWM control signal transmission in intense electromagnetic interference environment
  • Method and device for PWM control signal transmission in intense electromagnetic interference environment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Such as Figure 1-3 As shown, a PWM control signal transmission device in a strong electromagnetic interference environment, including a vehicle main control unit ECU that sends out a PWM voltage square wave signal, and a DC motor PWM pulse width modulation device set between the input terminals of the electronic control unit of the controlled motor The given circuit and the receiving circuit of the signal are characterized in that:

[0022] The given circuit is composed of a switching circuit composed of field effect transistors, its drain is connected to the receiving circuit, the grid is connected to the vehicle DC motor PWM pulse width modulation signal source, and the grid is connected in parallel to the ground There are at least two filter circuits composed of capacitors with different capacities, and the source is connected in series with a resistor connected to the ground to form a deep negative feedback circuit;

[0023] The receiving circuit includes an input...

Embodiment 2

[0034]A PWM control signal transmission device in a strong electromagnetic interference environment is characterized in that it includes a given circuit and a receiving circuit for a PWM pulse width modulation signal of a vehicle DC motor, and the given circuit is composed of a switching circuit composed of field effect transistors, The drain is connected to the receiving circuit, the grid is connected to the vehicle DC motor PWM pulse width modulation signal source, a filter circuit composed of at least two capacitors with different capacities is connected in parallel between the grid and the ground, and the source is connected in series A resistor is connected to the ground to form a deep negative feedback circuit;

[0035] The receiving circuit includes an input terminal of the electronic control unit of the controlled motor, a bias resistor is connected between the input terminal and the ground, and two resistors are connected to the input terminal, one of which is a switch...

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PUM

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Abstract

The invention discloses a method and device for PWM control signal transmission in an intense electromagnetic interference environment, and relates to the technical field of automobile direct-current motor PWM control. The method and the device are technically characterized in that a switching circuit formed by a field effect transistor is arranged between a PWM voltage square signal directly sent by a vehicle master electronic control unit (ECU) and the input end of an ECU of a controlled motor, at least two capacitors with different capacities are connected to the input grid electrode end of the switching circuit formed by the field effect transistor in parallel, and a broadband filtering circuit is formed; an output voltage dividing and voltage stabilizing circuit is arranged at the load end of the switching circuit formed by the field effect transistor and is in lap joint with the input end of the ECU of the controlled motor, and electromagnetic clutter waves are well filtrated out and inhibited. The method and the device overcome the technical difficulty of transmission of vehicle direct-current motor PWM signals, have the advantages of being simple, efficient, high in reliability and low in cost, are suitable for being applied to various motor vehicles and have good economic and social benefits.

Description

technical field [0001] The invention discloses a PWM control signal transmission method and device in a strong electromagnetic interference environment, and relates to the technical field of DC motor PWM control of automobiles. Background technique [0002] The electrical system of a car includes generators, starters, ignition devices, and control systems, which belong to a variety of complex and strong electromagnetic interference environments. Especially in the hybrid vehicles that have developed rapidly in recent years, it includes a combination of an engine, a high-voltage generator and a drive motor, which includes at least two sets of independent power generation and power supply systems, namely the drive power system and the control power system. More intense electromagnetic radiation. At present, the PWM pulse width modulation signal of the vehicle DC motor is directly sent by the vehicle main control unit ECU to the electronic control unit of the controlled motor. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/569
CPCG05F1/569
Inventor 杨平
Owner SHAZHOU PROFESSIONAL INST OF TECH