Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Periodic switch cut-out
Patent
1991-12-11
1993-05-04
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Periodic switch cut-out
315219, 315DIG7, H05B 3702
Patent
active
052085155
ABSTRACT:
A protection circuit compatible with an electronic stabilizer of a discharge apparatus, for preventing damage to circuit elements due to an excessive voltage at the premature ignition of a discharge tube, comprises an intermittent switching circuit coupled to a thyristor for periodically turning on or off the thyristor. In the intermittent switching circuit, a first contact point of a relay switch is coupled to the cathode of the thyristor and a resistor, a condensor and a gate of a transistor are connected in parallel from a second contact point of the relay switch and a relay coil and a channel of said transistor are serially connected from the power source and a base of another transistor is coupled to a third contact point of the relay switch, said other transistor controlling the operation of a transistor which drives the discharge tube.
REFERENCES:
patent: 3334270 (1967-08-01), Nuckolls
patent: 4350935 (1982-09-01), Spira
patent: 4890041 (1989-12-01), Nuckolls
patent: 4962336 (1990-10-01), Dodd
patent: 5023516 (1991-06-01), Ito
patent: 5049788 (1991-09-01), Lee
patent: 5051661 (1991-09-01), Lee
LaRoche Eugene R.
Zarabian A.
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