Automatic window drop control method for electric windows and its anti-emi interference topology circuit

Abstract

The invention discloses an automatic window drop control method of an electric vehicle window and its anti-EMI interference topology circuit. The circuit includes: an operational amplifier U5, a current sampling module electrically connected to the positive terminal of the first-stage amplification input of the operational amplifier U5, and the current The sampling module is used to sample the current of the motor driving the window, coupled to the high-frequency filter module of the first-stage amplification input negative terminal and output terminal of the operational amplifier U5, and the high-frequency filter module coupled to the second-stage amplification input negative terminal and output terminal of the operational amplifier U5 The high-pass filter module and the low-pass filter module, the output terminals of the high-pass filter module and the low-pass filter module are electrically connected to the comparator, and the output terminal of the comparator is electrically connected to the single-chip microcomputer of the window controller; the working current of the window motor is sampled by the current sampling module After being amplified by the operational amplifier U5, it is jointly filtered by the high-pass filter module and the low-pass filter module to prevent EMI interference and form the ripple signal required by the single-chip microcomputer, thereby precisely controlling the operation of the window.

Description

technical field [0001] The invention relates to the technical field of control of electric windows of automobiles, in particular to an automatic window drop control method of electric windows and a topological circuit for anti-EMI interference. Background technique [0002] The existing electric window control based on the ripple current method cannot automatically recognize and close the window when the external environment changes or the user is not in the car, which will lead to hidden dangers such as water entering the car. In addition, when the existing electric window is used for feedback adjustment of the driving motor, due to the long transmission line of the sampling signal, for the four-door vehicle, a large EMI interference will be generated, causing the controller of the electric window to receive an error signal , unable to achieve precise control of the windows. Contents of the invention [0003] The purpose of the present invention is to overcome the defici...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide an automatic window drop control method for electric windows and its anti-EMI interference topology circuit, which solves the problems of the existing electric windows that cannot be automatically dropped and caused by EMI interference. Technical problem of large window control error

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