Noise isolator circuit for power supply fan

Details Noise isolator circuit for power supply fan Noise isolator circuit for power supply fan

1985-12-16

1987-02-17

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

361 18, G05F 140

Patent

active

046442529

ABSTRACT:
An isolation circuit for preventing the current surges drawn by a direct current cooling fan from appearing in the output of the power supply. The fan has one terminal connected to one terminal of the power supply, and a regulator circuit connects the other terminal of the fan to the other terminal of the power supply. The regulator circuit includes a capacitor connected across the fan to provide a low impedance circulating path for the current surges, and it also includes a network which provides a constant current to the parallel combination of the fan and capacitor.

REFERENCES:
patent: 3551745 (1970-12-01), Nicholas
patent: 3809999 (1974-05-01), Smith
patent: 3916294 (1975-10-01), Kennedy
patent: 4435678 (1984-03-01), Joseph et al.
patent: 4459630 (1984-07-01), Beck
patent: 4475077 (1984-10-01), Nagano

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