| 摘要 |
<p>A system for controlling the supply of a motor 1, from a power supply source of the vehicle, is characterized in that it includes a pulse-width modulation chopper 7, which is interposed between the motor 1 and the supply source and whose operation is regulated by a square-wave drive signal, delivered by a controller 10, comprising a circuit 12 for generating an oscillating signal, means 13 for establishing a variable-amplitude control signal on the basis of control data 14 of the motor, which are associated with means such as a Zener diode for limiting the amplitude of this control signal to a value for safe operation of the motor, and a comparator 16 for comparing the oscillating signal and the control signal in order to establish the square-wave drive signal of the chopper 7. The motor may drive a fan of a cooling system of a vehicle.</p> |
