Circuit and method independent of frequency and voltage deviatio

Details Circuit and method independent of frequency and voltage deviatio Circuit and method independent of frequency and voltage deviatio

1998-02-18

1999-08-17

Gaffin, Jeffrey

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

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

315 8, H04N 929

Patent

active

059402610

ABSTRACT:
A degaussing circuit includes an AC mains voltage, a series arrangement of a degaussing coil (Ld) and a switching element (S1) coupled between the input terminals (it1,it2). A measuring circuit (3) continuously measures a value (Ms) representing an actual value of either the degaussing current (Id) through the degaussing coil (Ld) or the AC mains voltage (Vac). A detecting circuit (2) detects a level crossing instant (ts) at which the actual value (Ms) crosses a predetermined value (Vref2). A control circuit (1) determines a switching instant (tei,tstv) of the switching element (S1) in response to the level crossing instant (ts) for generating a peak value of the degaussing current (Id) related to the actual value of the degaussing current (Id) or the AC mains voltage (Vac) at the level crossing instant (ts).

REFERENCES:
patent: 4262232 (1981-04-01), Willis
patent: 4636911 (1987-01-01), Truskalo
patent: 4742270 (1988-05-01), Fernsler et al.
patent: 5307232 (1994-04-01), Manske
patent: 5357398 (1994-10-01), Kamijoh
patent: 5442515 (1995-08-01), Wallaert

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