DC motor drive control circuit for vehicle windscreen wiper - selectively connects pair of motor connecting elements to electrical energy source and uses two relays for motor control

摘要

The motor control changes over the direction of the motor (12) or stops it. The connecting of the energy source (3) with each of the relays (Ry1, Ry2) and for the isolation between these is carried out by a current connector (Ry). A controller is provided which so controls the current connector (Ry) that it separates the energy source (3) from the two relays (Ryl, Ry2). Then it controls the relays so that it changes over the connecting system between each of the connection elements (11a, 11b) of the motor (12) and the energy source (3). ADVANTAGE - Contacts of switches of control circuit of DC motor are protected against short circuit currents.