Fast warmup ballast for HID lamps

Details Fast warmup ballast for HID lamps Fast warmup ballast for HID lamps

1984-01-12

1986-03-04

Moore, David K.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315311, 315 54, 315284, 323258, H05B 4114, H05B 4136

Patent

active

045742235

ABSTRACT:
A lag ballast for a high intensity discharge lamp includes a transformer providing voltage at either of two levels. Triacs tied to the transformer supply current at the desired voltage level through either of two inductances. The triacs are controlled by a comparison circuit so that a low voltage and high current are supplied to the lamp during startup and a lower current and higher voltage are supplied as the lamp approaches its normal operating temperature.

REFERENCES:
patent: 2875379 (1959-02-01), Porter
patent: 3319153 (1967-05-01), Livingston
patent: 3384807 (1968-05-01), Klein et al.
patent: 3479559 (1969-11-01), Paget
patent: 3486070 (1969-12-01), Engel
patent: 3778699 (1973-12-01), Hoffman
patent: 3931544 (1976-01-01), Pitel
patent: 3944876 (1976-03-01), Helmuth
patent: 4162429 (1979-07-01), Elms et al.
patent: 4220911 (1980-09-01), Rosa
patent: 4337417 (1982-06-01), Johnson
patent: 4356433 (1982-10-01), Linden

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