Car window lifter. Scheme, description

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Car window lifter. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic devices

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This device automatically closes the door glass when the car is armed. Its principle is based on disconnecting the load when the set current is exceeded.

Fig.1 (click to enlarge)

When the car is armed, voltage is supplied from the door lock control circuit to the relay winding K 3, the relay is activated and contacts K3.1 connects capacitor C3 to a voltage of + 12V through resistor R5, the capacitor is charged.

After the end of the control pulse, the charged capacitor is connected to the winding of the relay K 2, it works and with its contacts K 2.2 supplies voltage to the timer assembled on the DA1 chip. At pin 7 of the microcircuit, a voltage close to 0 is set, and through the resistor R3, an opening voltage is applied to the base of the transistor VT2. Through the opened transistor VT2 and the closed contacts of the relay K 2.1, a holding voltage is applied to the winding of the relay K2. Transistor VT1 thermally stabilizes the operating point of the transistor VT 2. The closed contacts of relay K2.2 supply voltage to the winding of the relay K1. Through the resistor R4, the turnip contacts P1 and then through the power window control button, voltage is supplied to the engine, the glass closes.

When the glass is completely closed, the engine starts to slow down, the current increases, and the voltage drop across the resistor R4 also increases, which leads to the closing of the transistor VT2. The winding of relay K2 is de-energized, its contacts open, de-energizing the entire circuit. The protection trip current is set by resistor R2. The timer operation time is chosen to be 2-3 seconds longer than the time required for the glass to close completely. In normal mode, it does not have time to work, it will only work when, for some reason, the load disappears and there are no conditions for closing the VT2 transistor.

Auto window lifter
Fig.2. Printed circuit board

Publication: N. Bolshakov, rf.atnn.ru

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