US 3,946,271 A · SCR strobe lamp control for preventing capacitor recharge during after-glow

Abstract

A strobe lamp power supply control circuit for use with a high intensity strobe lamp operating at a high flashing rate in parallel with a capacitor storage arrangement is disclosed. Strobe lamp after-glow is quickly eliminated after each flash. This is accomplished by providing an SCR which disconnects the power source from the capacitor storage arrangement and the strobe lamp for a sufficient time to allow the after-glow to dissipate. A zero crossing detector is provided to protect the SCR from surge currents by permitting the SCR to be gated on only when there is a zero potential across the terminals of the SCR. Additionally, the capacitor storage arrangement may be used to supply either of two strobe lamps when a voltage limiting circuit is activated to regulate the amount of energy stored.

Claims14

Dependent claims

In a system for controlling the successive firing and extinguishment of a strobe lamp to insure complete extinguishment of said strobe lamp, the combination comprising

capacitor means for storing a charge to be supplied to said strobe lamp;
alternating current source means for charging said capacitor means;
and
circuit means, connected in series with said capacitor means and said means for charging, conductive prior to each firing of said strobe lamp for transmitting power from said means for charging to said capacitor means and nonconductive at the time of firing said strobe lamp and for a predetermined period thereafter for preventing application of power to said capacitor means from said means for charging, said predetermined period being sufficient to allow for complete extinguishment of said strobe lamp.

1 more element

Dependencies are inferred from the claim text.

SCR strobe lamp control for preventing capacitor recharge during after-glow

Life of this patent

SCR strobe lamp control for preventing capacitor recharge during after-glow

Life of this patent

Abstract

Claims14