Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Transformer in the supply circuit
Patent
1976-02-20
1978-06-20
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
Transformer in the supply circuit
315194, 315244, 315291, 315DIG4, H05B 41392
Patent
active
040964132
ABSTRACT:
To solve a flicker problem in a discharge lamp dimming system which results from non-synchronous high frequency, substantially sinusoidal perturbation signals imposed upon the AC line, the intensity control section of the circuit is modified. In one form of the preferred embodiment, a secondary winding of the input transformer is spaced apart from the primary winding thereof to increase the leakage reactance of the secondary winding and to decrease the capacitive coupling between windings. A capacitance of suitable value is connected across the output of the secondary winding thereby allowing the combination to serve as a low pass filter to block the line perturbation signals. In another form of the preferred embodiment, a differentiator-limiter-integrator network is included in circuit to provide a non-perturbed zero-crossing for the firing circuit, ie, the intensity controller, thereby to eliminate flicker.
REFERENCES:
patent: 3767940 (1973-10-01), Herzog
patent: 3878431 (1975-04-01), Petrina
patent: 3935502 (1976-01-01), Herzog
General Electric Company
LaRoche Eugene R.
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