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A PWM control signal transmission method and device in a strong electromagnetic interference environment

A technology with strong electromagnetic interference and control signals, which is applied in the direction of control/regulation systems, regulation of electrical variables, instruments, etc., can solve problems that restrict the transmission safety of PWM control signals of DC motors used in vehicles, and achieve good economy, suppress influence, and meet The effect of transmission matching

Active Publication Date: 2017-12-05
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 control signal transmission of DC motors for vehicles

Method used

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  • A PWM control signal transmission method and device in a strong electromagnetic interference environment
  • A PWM control signal transmission method and device in a strong electromagnetic interference environment
  • A PWM control signal transmission method and device in a strong 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 includes a vehicle main control unit ECU that sends out a PWM voltage square wave signal, and a DC motor PWM control signal set between the input terminals of the electronic control unit of the controlled motor A given circuit and a receiving circuit, characterized in that:

[0022] The given circuit is composed of a switch circuit composed of field effect transistors, its drain is connected to the receiving circuit, the gate is connected to the PWM signal conditioning and amplifying circuit, and at least two parallel circuits are connected between the gate and the ground. A filter circuit composed of capacitors of different capacities, the source is connected in series with a resistor connected to the ground, forming a deep negative feedback circuit;

[0023] The receiving circuit includes an input terminal of the electronic control unit of the c...

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 the PWM control signal of a vehicle DC motor, the given circuit is composed of a switch circuit composed of a field effect transistor, and its drain The pole is connected with the receiving circuit, the grid is connected with the PWM signal conditioning and amplification circuit, the grid and the ground are connected in parallel with a filter circuit composed of at least two capacitors with different capacities, and the source is connected in series with a resistor connected to the ground phase. connected 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...

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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 control 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. The PWM voltage...

Claims

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Application Information

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