DC FAN DRIVING CIRCUIT, METHOD FOR STARTING DC FAN, METHOD FOR DC FAN DRIVE CONTROLLING

摘要

PROBLEM TO BE SOLVED: To reliably start a fan with a minimum circuit scale. ;SOLUTION: Fan capacity control resistors 12-1, 12-2 are put in connection between a power source line 11 and power source supplying terminals of DC fans 13-1, 13-2 respectively and the flow rates of the DC fans 13-1, 13-2 are controlled. Diodes 15-1, 15-2 are put in connection between a starting power source 14 and the power source supplying terminals of the DC fans 13-1, 13-2 in the forward direction from the starting different power source to the power source supplying terminals.;COPYRIGHT: (C)1999,JPO