Demagnetization circuit

Details Demagnetization circuit Demagnetization circuit

1997-11-04

1998-10-20

Fleming, Fritz

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Systems for magnetizing, demagnetizing, or controlling the...

361267, H01F 1300

Patent

active

058256040

ABSTRACT:
In one example of a demagnetization (degaussing) circuit, main electrodes of a TRIAC, a first positive temperature characteristic thermistor and a demagnetization coil are connected in series to both ends of an AC supply, and a heat-sensitive switch and a heating resistor are connected in series between an end of the TRIAC on the side of the AC supply and an end of the demagnetization coil on the side of the AC supply. A connecting point between the heat-sensitive switch and the heating resistor is connected to a gate electrode of the TRIAC, and the heat-sensitive switch and the heating resistor are thermally coupled to each other. The disclosed demagnetization circuit does not need a secondary electric circuit such as a relay control circuit and allows easy substrate design, with a small number of components and at low cost. Furthermore, a demagnetization current sufficiently damps to the level causing no color misregistration and color unevenness on a screen of a color television receiver, from the time the color television receiver is powered on until the time a picture appears on the screen.

REFERENCES:
patent: 3562614 (1971-02-01), Gramkow
patent: 3733524 (1973-05-01), Cooksey
patent: 3944870 (1976-03-01), Sutton, Jr. et al.
patent: 4445072 (1984-04-01), Fredres
patent: 4504817 (1985-03-01), Shikama et al.
patent: 4829214 (1989-05-01), Lendaro

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