| 摘要 |
A brushless DC fan (10) with a winding supply circuit (49) having an internal voltage regulator (53) can afford current limiting and thermal protection and provide various desired fan speeds without alteration of the basic fan circuit, the windings, or other manufacturing items. A voltage setting circuit element (63) can set fan speed externally and can be used to establish various fan speeds. An internal voltage establishing circuit element (58) sets the maximum speed. The regulator replaces the fan's protective thermistor to shut down the voltage to the windings (47) when locked rotor occurs. Bringing out a lead (21) for the purpose of connecting a speed controlling resistor, thermistor, or active programming means to the internal circuitry enables the fan's end user to alter operation as needed. |
