Low power fan drive circuit for personal computers

Details Low power fan drive circuit for personal computers Low power fan drive circuit for personal computers

1993-10-29

1995-11-21

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 18, 361 25, 361103, H02H 300

Patent

active

054693209

ABSTRACT:
An efficient fan drive circuit to drive a variable fan used in a power supply of a personal computer system. The fan drive circuit uses a diode to establish the minimum fan speed during operation in the normal temperature range. The bleeder resistor normally coupled between the fan and a negative output voltage is removed and replaced with a current source. The current source also serves to shut down the power supply if the fan is not operating properly or is not installed. A shut down circuit remains to shut down the power supply when excessive temperature occurs, or when the current source detects that the fan is malfunctioning or not installed.

REFERENCES:
patent: 5197858 (1993-03-01), Cheng

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