| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a motor driving voltage converter that can rotatively drive a DC brushless motor at a constant rotational speed by a simple constitution. <P>SOLUTION: The motor driving voltage converter 11 is connected between an AC voltage source 10 and the DC brushless motor 60, and a DC voltage that rotatively drives the DC brushless motor 60 is obtained from an AC voltage of the AC voltage source 10. The voltage converter 11 comprises: an SCR 14 connected between the AC voltage source 10 and the DC brushless motor 60; a voltage detection circuit 24 that detects the back electromotive force of the DC brushless motor 60; a microcomputer 27 that is connected to a gate terminal of the SCR 14, and controls the generation timing of a trigger pulse output to the gate terminal so that the back electromotive force is kept at a prescribed level Va on the basis of the detected back electromotive force; and a gate signal generation circuit 26. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
