Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Periodic switch cut-out
Patent
1990-01-05
1991-04-16
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Periodic switch cut-out
315219, 315DIG7, H05B 4136
Patent
active
050085980
ABSTRACT:
A control circuit for fluorescent lamps having gas filled tubes and a pair of discharge electrodes in the tubes includes a transformer, a gated switching device and a control signal generating circuit. The transformer has a secondary winding connected with the lamp discharge electrodes and a primary winding to which power is applied by the switching device when a gating signal is applied to its gating terminal. The control signal generating circuit normally controls the gating of the switching device by alternatingly applying, and then ceasing to apply, a control signal to the gating terminal. The control circuit is capable of continuing a current between the discharge electrodes once the lamp is conducting. The control circuit is further capable of "starting" a lamp by applying a high voltage to the discharge electrodes. The high voltage is generated when the gated switching device is not applying power to the primary winding. In order to avoid arcing and corona discharge in the control circuit as a result of misconnected and leaky fluorescent lamps, a voltage responsive device is connected with the gating terminal and responds to the voltage across the primary winding by applying a signal to the gating terminal in order to switch the switching device to apply power to the primary winding and, in this manner, causing the transformer to cease the generation of the damaging high voltage.
REFERENCES:
patent: 4392087 (1983-07-01), Zansky
patent: 4667131 (1987-05-01), Nilssen
LaRoche Eugene R.
Neyzari Ali
Progressive Dynamics, Inc.
LandOfFree
Fluorescent lighting control circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fluorescent lighting control circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fluorescent lighting control circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-423461