High frequency miniature electronic ballast with low RFI

Details High frequency miniature electronic ballast with low RFI High frequency miniature electronic ballast with low RFI

1993-12-28

1994-12-06

Pascal, Robert J.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315307, 315247, 315224, 315DIG5, H05B 3702

Patent

active

053714407

ABSTRACT:
A miniature electronic ballast with low radio frequency interference (RFI) for operating a discharge lamp by amplitude modulation and two frequency operation. A high frequency operating voltage (approximately 1-2 MHz) is generated and is amplitude modulated at a relatively lower frequency (approximately 20-50 KHz). This operating voltage is demodulated to suppress the high frequency carrier voltage (1-2 MHz) and the low frequency modulating signal (20-50 KHz) itself is applied to the discharge lamp to energize same. The use of the high frequency operating voltage makes it possible to reduce the size of the magnetic components in the electronic ballast, whereas the low frequency voltage actually applied to the discharge lamp avoids problems of RFI that otherwise would occur if the high frequency carrier voltage itself was applied to the discharge lamp.

REFERENCES:
patent: 4700113 (1987-10-01), Stupp et al.
patent: 5142201 (1992-08-01), Wessels

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