| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a control circuit for high-voltage start low-voltage high-speed operation of a DC fan motor. <P>SOLUTION: This circuit includes mainly an input unit, a comparison circuit, a control unit, and an output unit at least. An import unit is connected to the comparison circuit and the control unit, and power is inputted to operate the control circuit. The output unit includes a motor coil set and the control unit is connected and the output unit is driven by the control unit. The comparison circuit is connected to the control circuit, and controls the output current of the control circuit. By the coupling of each unit described above, it never short-circuits the control unit due to the excessive current at high-voltage start of a motor, and it is possible to keep high-speed operation even at low-voltage output, too, thus it can achieve the property of heat dissipation and power saving. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
