Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1986-06-24
1988-02-09
Chatmon, Saxfield
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315 94, 315106, 315107, 315209CD, 315239, 328 68, 307 33, G05F 100, H05B 3702, H05B 3904, H05B 4136
Patent
active
047243635
ABSTRACT:
A current control circuit for high voltage applications includes series-connected high and low voltage sources through which the current to be regulated flows. The low voltage source is a capacitor which is periodically recharged through a flyback transformer by a series of constant energy pulses having a very low duty cycle. The peak value of the flyback pulses are detected to provide a "condition signal" which is representative of the state-of-charge on the capacitor and can be used to protectively inhibit operation of the control circuit and can, in a variant of the circuit be used as an error control signal to maintain the current at a constant level. In the preferred embodiment a sensing capacitor is placed in parallel to the pulsed capacitor to detect the fluctuations in potential and form a sense current which is representative of the regulated current and which is used in a feedback loop to form a control signal for maintaining the regulated current constant. One application of the control circuit is the control of the beam current in a light valve.
REFERENCES:
patent: 3315124 (1967-04-01), Boeker
patent: 3619717 (1971-11-01), Lee et al.
patent: 3742242 (1973-06-01), Morio et al.
patent: 4334195 (1982-06-01), Luce
patent: 4422016 (1983-12-01), Kurpe
patent: 4591761 (1986-05-01), Gregorich et al.
Chatmon Saxfield
Coughlin Jr. Vincent J.
General Electric Company
Whitacre Eugene M.
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