Patent ID: 6351601
Filing Date: 2002-02-26
Classification: H02P

Abstract:
A fan speed control system, comprising:(a) a power control block supplying an output voltage to a fan; (b) at least one control line interfaced with said power control block to operatively adjust said output voltage to said fan, said at least one control line comprising a resistor divider; and (c) a logic state machine coupled to said at least one control line, said logic state machine providing digital signals, in response to digital commands, to said at least one control line to cause said at least one control line to operably adjust said output voltage to said fan, said logic state machine selectively controlling said resistor divider to divide a selected portion of said output voltage by controlling said at least one control line to have a first signal level, and said logic state machine selectively controlling said resistor divider not to divide a selected portion of said output voltage by controlling said at least one control line to have a second signal level.