Circuit device for acquiring number of rotating circles of motor

Abstract

The invention discloses a circuit device for acquiring the number of the rotating circles of a motor. The circuit device includes a microprocessor (1), a filtering / shaping circuit (2), a locked-rotor sampling circuit (3), a power source conversion circuit (4), a locked-rotor sampling resistor (R) and a switching loop (QH). According to the circuit device of the invention, the switching loop is composed of a high-frequency transformer, a motor, an A relay and a B relay; and the power source conversion circuit converts 12V voltage of a vehicle power source into 5V voltage which is supplied for the microprocessor. According to the technical scheme of the invention, signals generated by electrified rotation and inertia rotation of the motor are fed back to the microprocessor through the switching loop, so that the microprocessor performs counting processing, and therefore, the circuit device for acquiring the number of the rotating circles of the motor has the advantages of no signal loss as well as being accurate and reliable, and can assist in reducing cost.

Description

technical field [0001] The invention relates to a circuit device, in particular to a circuit device for collecting the number of rotations of an electric window motor of an automobile. Background technique [0002] The electric window of the car is driven by a motor controlled by a computer. The drive motor for lifting the window glass of the car is a brushed DC motor, referred to as the motor; Hazard due to inadvertently inserted hands, heads or other objects. For this reason, European and American standards stipulate that when the window glass automatically rises within 4 to 200 mm below the window frame, an object should be automatically lowered if it is clamped. The pressure on the clamped object, including the human body, must be less than 100 Newtons, so as not to affect the human body. cause some damages. To ensure that the window glass has an anti-pinch function in a specified area, the position of the glass must be detected. To detect the position of the glass, th...

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Problems solved by technology

[0003] In the prior art, there are two kinds of devices for collecting the number of rotations of the motor, one is the current type, and the other is the Hall type; the so-called current type is to convert the current fluctuation generated by the motor rotor energized and rotated into a current waveform by the waveform acquisition circuit The signal is provided to the computer to count the number of turns; when the power is turned off, the motor will continue to rotate for a few circles due to inertia, so it is called inertial rotation; the motor is in the motor state when it is energized and rotated; The motor is in the generator state and outputs sine waves; the waveform acquisition circuit in the prior art cannot collect the inertial rotation waveform of the motor, so there is leakage, which leads to inaccurate counting provided by the current formula, and the accumulation of leakage will make the window The lifting and lowering of the glass produces dangerous misoperations; the advantage of the current type is low cost, and the disadvantage is poor reliability; the so-called Hall type uses a Hall brushed DC motor with a Hall circuit inside, referred to as a Hall motor. The circuit converts the angle of rotation of the rotor into a pulsed square wave and provides it to the computer for angle counting processing; the advantage of the Hall type is high reliability, but the disadvantage is high cost; therefore, the existing technology has the problem of poor reliability or high cost. insufficient

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