Electric lamp and discharge devices: systems – Condenser in the supply circuit – Condenser in shunt to the load device and the supply
Patent
1976-07-28
1978-02-21
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Condenser in the supply circuit
Condenser in shunt to the load device and the supply
315241R, 320 1, 323 435S, 363 74, H05B 4132, H02J 1500
Patent
active
040755363
ABSTRACT:
A system for charging an energy storage capacitor for use with an electronic flash lamp or laser employs stepped sequential application of increasing charging voltages to the capacitor. In an inverter-type power supply, a transformer has a tapped primary and a single secondary, output of which is rectified and applied to the capacitor. A plurality of pairs of drive transistors are used to apply an alternating voltage to progressively decreasing portions of the transformer primary, in response to a feedback signal indicative of the voltage to which the capacitor has been charged. This feedback signal is utilized by a level detector and associated drive control logic to enable a different pair of drive transistors each time a preestablish charge voltage level has been reached. A driver inhibit circuit insures that, as each pair of drive transistors is alternating on and off, that one transistor is fully off before the other is turned on. The inhibit circuit also turns off all of the drive transistors when the energy storage capacitor is discharged, so that the power supply is not overloaded when the capacitor discharges to flash the lamp.
REFERENCES:
patent: 3706022 (1972-12-01), Corey et al.
patent: 3917975 (1975-11-01), Birkner
LaRoche Eugene R.
Marrs Roger A.
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