Power supply for timed residual power after turn off

Details Power supply for timed residual power after turn off Power supply for timed residual power after turn off

1994-11-14

1996-07-30

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

307 21, 307 22, 307 80, 307 81, 307 86, 307 87, 257119, 323237, H02J 308

Patent

active

055414583

ABSTRACT:
This invention relates to an improved laser printer power supply that maintains 24-, 12-, and 5 volt DC power to run exhaust fans for a brief period after the power switch is turned off. These fans remove undesirable ozone from the photo-conducting print drum so as to extend the life of the photo-conductor. The circuits utilize a timer circuit and an optically isolated photo-diac to turn a power triac on and off.

REFERENCES:
patent: 4384213 (1983-05-01), Bogel
patent: 4521693 (1985-06-01), Johnson
patent: 5325209 (1994-06-01), Manabe

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