Circuit configuration for fan regulation

Details Circuit configuration for fan regulation Circuit configuration for fan regulation

2006-02-21

2006-02-21

Jiang, Chen Wen (Department: 3744)

Automatic temperature and humidity regulation

Ventilator type

Electrically actuated

C327S077000, C327S074000, C318S608000, C415S013000

Reexamination Certificate

active

07000848

ABSTRACT:
A fan regulation circuit configuration includes an input receiving an input voltage (proportional to fan current and forms a first comparison voltage), a low-pass filter (filters input voltage and a filter output voltage is tapped off as second comparison voltage), a first comparison device for commutation identification (outputs signal indicating a commutation if value of one of the comparison voltages multiplied by first factor is greater than the other comparison voltage), and a regulator (outputs a control voltage dependent upon identified commutation pulses). The circuit has self-adjusting sensitivity adaptation and a second comparison device outputting a signal if the value of one of the comparison voltages multiplied by a second factor is greater than the other comparison voltage, the second factor being less than the first factor. A control device decreases the first and second factors in the event of an output signal of the second comparison device being received to reduce the sensitivity of the commutation identification.

REFERENCES:
patent: 4721865 (1988-01-01), Tallaron et al.
patent: 6274991 (2001-08-01), Busch
patent: 6285146 (2001-09-01), Harlan
patent: 198 07 253 (1999-09-01), None

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