| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a DC motor drive circuit in which a transistor of high breakdown voltage can be made unnecessary and a power loss is prevented and energy saving can be performed. <P>SOLUTION: The DC motor drive circuit includes magnetic detectors 1, 3 which output a rectangular wave signal showing the position of a rotor, an inverting circuit 7 which outputs a reversed square wave signal, first drive switching circuits 4-6 each for conducting the first coil LA based on the square wave signal, second drive switching circuits 8-10 each for energizing the second coil LB based on the reversed square wave signal, first charging switching circuits 11, 13 each for charging a capacitor 15 with the energy stored in the first coil when the first drive switching circuit is turned off, and second charging switching circuits 12, 14 each for charging similarly the capacitor 15 with the energy stored in the second coil. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
