Circuit for driving direct current control motors e.g for vehicle heating and ventilation systems, has switching devices with on/off switches for connecting motors to or separating them from current source using control signal

摘要

The circuit has a D.C. current source for supplying the control motors (M1-M3) with current and a switching device (R1,R2,S1-S3) per motor for altering its direction of rotation. The polarity of the current source is changed over with a predefined period. The switching device contains an on/off switch to connect the motor to or separate it from the current source using the control signal.