| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a motor drive power supply circuit which suppresses start-up failure of a motor and motor stop during driving a motor when driving a DC sensorless brushless motor in a power supply configuration of constant current control. <P>SOLUTION: A motor drive power supply circuit comprises: a step-down chopper type power supply 6; a motor drive unit 2 which includes an inverter circuit driving a DC sensorless brushless motor; a load current detection unit 7 which detects current flowing in the motor drive unit 2; an output current detection unit 8 which operates in response to detection value of the load current detection unit 7; an output feedback unit 10 which feeds back output status in response to behavior of the output current detection unit 8; a reference voltage generation unit 11; a comparator 14; an output voltage clamp unit 9; and an output feedback selector unit 15 which switches operation of the output feedback unit 10 between the output current detection unit 8 and the output voltage clamp unit 9 in response to an output voltage value. <P>COPYRIGHT: (C)2013,JPO&INPIT |
