Windscreen wiper circuit with reversible DC motor - has partial circuits with semiconductor valves which are interrupted at specified angle of limit switch

The windscreen wiper system has a manually set switch for continuous operation and a polarity change-over switch, over whose mobile contact bridge a positive or negative potential is selectively supplied to a motor terminal. The motor controls a limit switch which connects the other motor terminal, between limit end position, to the change-over switch contact bridge. In both end positions, a semiconductor diode, or similar component, is incorporated in a blocking direction in the motor circuit. The polarity change-over switch is actuated via a relay, controllable via the continuous operation switch and the limit switch. The circuits incorporating the semiconductor diode, are interrupted when the swivel angle of the limit switch is greater by a given proportion than the required wiper angle.