Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Periodic switch in the primary circuit of the supply...
Patent
1993-11-03
1995-04-11
Pascal, Robert J.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Periodic switch in the primary circuit of the supply...
315DIG4, 315DIG7, 315225, H05B 3702, H05B 4136
Patent
active
054061741
ABSTRACT:
A circuit for high-frequency operation of a discharge lamp. The circuit includes a load branch provided with terminals for connection to the discharge lamp and with an electrode heating transformer having a primary winding and secondary windings. Each secondary winding is shunted by a branch comprising an electrode of the discharge lamp. At least one switching element generates a high-frequency current through the load branch from a supply voltage. A control circuit generates a control signal for rendering the switching element conducting and non-conducting at a high frequency. A dimmer circuit is coupled to the control circuit for adjusting the frequency of the control signal. Each branch shunting a secondary winding of the transformer also includes an inductive element and a capacitive element and has a resonance frequency which is different from the resonance frequency of the load branch. Thus, a discharge lamp operated by this circuit can be dimmed over a wide range and provides a comparatively long electrode life and with very little blackening at the ends of the discharge vessel.
REFERENCES:
patent: 4682080 (1987-07-01), Ogawa et al.
patent: 5103139 (1992-04-01), Nilssen
patent: 5173643 (1992-12-01), Sullivan et al.
patent: 5237243 (1993-08-01), Chung
Blocker Edward
Franzblau Bernard
Neyzari Ali
Pascal Robert J.
U. S. Philips Corporation
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