Patent Number: 7,089,128

Title: Control circuit of a DC fan motor for start with high voltage and high rotational speed with low voltage

Abstract: A control circuit of a DC fan motor for start with high voltage and high rotational speed with low voltage at least includes an input unit, an output unit, a control unit and a comparator. The input unit is connected to the comparison unit and the control unit for the power being inputted to operate the control circuit. The output unit has motor coil sets to be connected to the control unit such that the output unit can be driven by way of being controlled with the control unit. The comparison unit is connected to the control unit to control output current of the control unit. Hence, while the motor starts in a condition of being high voltage, the control element can prevent from being burned out due to excessively large current. Further, the motor fan can maintain a high constant rotational speed with low voltage output to enhance capability of heat dissipation and power saving.

Inventors: Liu; Meng-Chih (Taipei, TW)

Assignee: Asia Vital Component Co., Ltd.

International Classification: G01R 19/00 (20060101)

Expiration Date: 8/08/02018