| 摘要 |
The invention relates to a driver circuit for a D.C. motor without a commutator, especially to drive a ventilator. Within each commutation phase, which is determined by a rotor position sensor circuit (2), a control pulse is supplied whose duration and/or amplitude is varied to control the power supplied to the motor. Provided in order to generate the control pulses is a triangular wave form generator (21) whose period duration corresponds approximately to one commutation phase. The time of at least one edge of the control pulses for the output stages (60, 70) is defined by comparing the triangular wave form signal with a reference signal. <IMAGE> |
