Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1992-04-21
1994-04-26
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
315 8, H04N 929
Patent
active
053072324
ABSTRACT:
A fast reset degaussing system includes a full wave rectifier bridge having a degaussing coil coupled in series therewith to a source of operating AC power. A variable current element is provided by a field effect transistor which produces a variable load upon the full wave rectifier bridge. An RC charging circuit is coupled to the control electrode of the field effect transistor to cause an exponentially decaying current within the transistor and thereby impose an exponentially load upon the full wave rectifier bridge. The degaussing coil current responds directly to the load imposed upon the rectifier bridge by the field effect transistor and produces an exponentially decaying alternating current suitable for cathode ray tube degaussing.
REFERENCES:
patent: 4760489 (1988-07-01), Truskalo
patent: 4829214 (1989-05-01), Lendaro
Gaffin Jeffrey A.
Zenith Electronics Corp.
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