Means for preventing damage to electronic ballasts as a result o

Details Means for preventing damage to electronic ballasts as a result o Means for preventing damage to electronic ballasts as a result o

1989-05-03

1991-07-09

Pascal, Robert J.

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Arc machining

315241R, 315310, 315DIG5, H05B 3700

Patent

active

050308920

ABSTRACT:
The present invention discloses a means and method for preventing damage to electronic ballasts for high frequency lamps. In normal use lamps assume rectifying characteristics and generate direct current which interferes with the proper functioning of the system. In one aspect of the invention, a capacitor is used to prevent damage caused by this direct current. In another aspect of the invention, the capacitor also reduces the operating voltage of the lamps while preventing damage caused by the direct current. Another aspect of the invention gives added control of the filament voltage before and after the ignition of the lamps. In a further aspect of the invention, a capacitor is connected in series with the primary of the filament transformer to prevent damage caused by a short circuited secondary.

REFERENCES:
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patent: 4806830 (1989-02-01), Ueki
Campbell, John H., "New Parameters for High Frequency Lighting", Illuminating Engineering, May 1960, pp. 247-256.

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