Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Transformer in the supply circuit
Patent
1987-12-16
1990-01-02
DeMeo, Palmer C.
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
Transformer in the supply circuit
315276, 315307, 315224, H05B 4116
Patent
active
048915629
ABSTRACT:
A regulator circuit for a high intensity discharge lamp includes a magnetic regulator having three windings, the primary and second thereof being connected to line voltage and a lamp. The tertiary winding is connected to a storage capacitor and to a reactor circuit having an inductive reactor and a semi-conductor switch in series. Lamp voltage and current signals are derived by a control circuit which turns the semi-conductor switch on at specific times in each half cycle of operation. The firing angle of the switch is altered to regulate the lamp operating characteristics despite line voltage changes and operating voltage variations resulting from lamp aging and other factors. The control circuit can also be operated as a lamp dimmer circuit.
REFERENCES:
patent: 4501994 (1985-02-01), Spreadbury
patent: 4503364 (1985-03-01), Engel
patent: 4562384 (1985-12-01), Owen
patent: 4609852 (1986-09-01), Perper
patent: 4612480 (1986-09-01), Kneisel
patent: 4754201 (1988-06-01), Knoble et al.
patent: 4795945 (1989-01-01), Mayer
Buckley, II Paul J.
Nuckolls Joe A.
'Hubbell Incorporated
DeMeo Palmer C.
Farley Walter C.
Palladino Brian
Presson Jerry M.
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