Circuit for reducing ELF electric fields radiated from CRT devic

Details Circuit for reducing ELF electric fields radiated from CRT devic Circuit for reducing ELF electric fields radiated from CRT devic

1993-06-28

1995-03-07

Pascal, Robert J.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Pulse storing

315 85, 315349, 315291, H01J 2906

Patent

active

053961510

ABSTRACT:
A circuit for reducing extremely low frequency (ELF) electric fields on cathode ray robe (CRT) devices comprises a power supply means, a CRT, a voltage sensing means, an amplification means, and a capacitive coupling within a feedback path to the CRT. A CRT anode voltage variation sensed by the voltage sensing means is amplified and inverted by the amplification means, producing a signal which is applied to the capacitive coupling within the feedback path. This signal modifies the impedance at the CRT anode, decreasing the voltage variation and thereby reducing ELF electric field magnitudes.

REFERENCES:
patent: 4823248 (1989-04-01), Ikeuchi et al.
patent: 5043598 (1991-08-01), Maeda et al.
patent: 5151635 (1992-09-01), Cappels

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