Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Impedance or current regulator in the supply circuit
Patent
1992-07-09
1995-06-27
Lee, Benny
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Impedance or current regulator in the supply circuit
363 17, 363132, 315244, 315307, 315DIG7, 315DIG5, H02M 3335
Patent
active
054282675
ABSTRACT:
The invention relates to a DC power supply utilizing DC to AC to DC conversion with pulse to pulse current mode IC controlled PWM modulation at an above-sonic repetition rate (e.g., 30 Khz) in a degenerative feedback loop to achieve output regulation.
The powder supply, which includes a step-down transformer and a choke input LC filter, is designed for energizing a short-arc, lamp and provides glow to arc transition energization, regulated run energization, and igniter controls. Output regulation may be either of current or power and is based on using a current emulating the current flowing into the filter choke or using both the emulating current and a voltage sensed in a separate secondary winding of the transformer. A novel ramp generating circuit which preserves loop sensitivity at high power loads and a novel method of powering the controlling IC are also disclosed.
REFERENCES:
patent: 4873616 (1989-10-01), Fredrick et al.
patent: 4885671 (1989-12-01), Peil
Unitrode Linear Integrated Circuits Data and Applications Handbook. Pp. 4-120 through 4-126 (1825); pp. 4-172 through 4-178 (1846).
Lee Benny
Premier Power Systems, Inc.
Shingleton Michael B.
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