Feedback-controlled circuit and method for powering a high inten

Details Feedback-controlled circuit and method for powering a high inten Feedback-controlled circuit and method for powering a high inten

1992-11-05

1994-10-18

Pascal, Robert J.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

315209R, 315307, 315DIG7, H05B 3702

Patent

active

053571746

ABSTRACT:
A circuit and method for powering a high intensity discharge lamp, such as a high pressure sodium lamp (HPSL) are disclosed. Feedback control is used to achieve a nearly constant amplitude of lamp current so as to attain nearly constant lamp color in a HPSL, and further accommodates considerable variations in a.c. line voltage. The circuit, which shares some features with the method, includes a circuit to supply a d.c. bus voltage and first and second feedback-controlled circuits. The first feedback controlled circuit regulates the bus voltage in response to a first error signal which is derived as a function of peak lamp current and a set point signal for such peak current. The second feedback controlled circuit regulates lamp power in response to a second error signal which is derived as a function of average bus current and a set point proportional to the difference between regulated bus voltage and lamp power.

REFERENCES:
patent: 4928038 (1990-05-01), Nerone
patent: 5128592 (1992-07-01), Dean et al.

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