Optimal fan presence detection

Details Optimal fan presence detection Optimal fan presence detection

2007-06-19

2007-06-19

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Switched reluctance motor commutation control

C318S504000, C388S909000

Reexamination Certificate

active

11353387

ABSTRACT:
Detecting the presence of an electric fan is described. A current sink circuit is coupled to a pulse width drive output of a fan control circuit. A logic state in a logic input buffer is defined based on current flow through the current sink. The logic state indicates if a fan is coupled to the pulse width drive output.

REFERENCES:
patent: 5436827 (1995-07-01), Gunn et al.
patent: 6836092 (2004-12-01), Sivertsen
ATmega 128 Microcontroller by Atmel Corp., p. 1 shows the microcontroller system features, p. 2 shows the pin configuration, p. 3 shows the circuit block diagram.

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