Electric lamp and discharge devices: systems – Pulsating or a.c. supply – With power factor control device
Patent
1975-02-03
1976-06-29
Grimm, Siegfried H.
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
With power factor control device
315279, 315308, 321 14, 321 15, 321 19, 323 20, 323 22T, 323 22Z, 331113R, 331177R, 331183, G05F 144, H05B 4129
Patent
active
039671593
ABSTRACT:
A regulated power supply for a laser or gas discharge lamp employs a variable duty cycle oscillator to control the output voltage level. Output current to the laser or lamp load is maintained at a constant value by a feedback loop that controls the oscillator duty cycle. The output current is sensed by a novel circuit which employs a voltage regulator in series with the current return path. A change in output current causes a concomitant change in voltage across a resistor divider that shunts the voltage regulator. The voltage from this divider is a feedback signal that is supplied to a duty cycle modulator which controls the oscillator duty cycle.
Another feedback signal is derived in delayed response to voltage output in excess of a certain high value. This feedback signal, which occurs, e.g., when the laser or lamp load does not ignite within a certain time period, also modifies the oscillator duty cycle so as to reduce the output voltage to a level that can be maintained continuously without damage or overheating of any circuit component.
REFERENCES:
patent: 3462643 (1969-08-01), Turner et al.
patent: 3551785 (1970-12-01), Ferrara
patent: 3689827 (1972-09-01), Quinn
patent: 3701937 (1972-10-01), Combs
Dendy King Hubert
Leskin Morton B.
Grimm Siegfried H.
Leskin Morton B.
Silber Howard A.
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