The direction of motor rotation can be controlled using only one MOSFET, while the other MOSFET can be switched by PWM to control the motor current. 2 b) is a scheme that directly uses MOSFETs to drive the motor. However, the relay cannot control the current of the motor, so it still needs to be connected to a MOSFET to control the current, so as to meet the functional requirements of anti-pinch.įig. The direction of the motor rotation is selected by the contact of the relay. Therefore more and more manufacturers consider using MOSFETs to replace relays.įig. 2 a) is a motor scheme that mainly uses relays for motor drive. However, compared with relays, MOSFETs have obvious advantages in noise, service life, miniaturization and reliability. Driving a relay is simple, and the internal resistance of the connection can be very low. In modern automotive applications, an average of about 30 relays are used in a car. Relay replacement in a power-folding mirror assembly
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