Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1991-11-12
1993-08-31
Pellinen, A. D.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
315 8, 361165, H01F 1300, H01H 4700, H04N 929
Patent
active
052414485
ABSTRACT:
A demagnetizing circuit for a color picture tube includes a parallel combination of a relay coil and a negative temperature coefficient (NTC) resistor in series with the primary of the power supply transformer. The contact of the relay is connected into the degaussing circuit. As the NTC warms up the current through it increases and the current through the relay coil correspondingly decreases. When the current through the relay coil falls below the relay holding current the relay contact opens and the demagnetizing current ceases to flow.
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Blaha, Robert F., "IEEE Transactions on Broadcast and Television Receivers", vol. BTR-18, No. 1, Feb. 1972, pp. 7-9.
Davenport Francis A.
Deutsche Thomson-Brandt GmbH
Fleming Fritz M.
Laks Joseph J.
Pellinen A. D.
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