Process and apparatus for charging a capacitor and application of the process
AssigneeZellweger Uster AG
InventorsSimon Goede, Kurt Fischer
Life of this patent
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Abstract
A process and apparatus for charging a capacitor, particularly for flash guns with a fast flash series, so as to achieve a short charging time while avoiding a high charging current pulse, the charging current during the course of the charging being regulated to a value which at least approaches a constant. The time constant of the charging circuit is altered during the charging process by a controlled resistance arrangement which is controlled in dependence upon the charging voltage of the capacitor.
Claims14
Apparatus for charging a capacitor comprising a source of direct current, a primary switch, variable impedance means connected in series with said primary switch across said capacitor, first control means responsive to the terminal voltage of said capacitor for closing said primary switch, and second control means responsive to the terminal voltage of said capacitor for controlling the impedance of said variable impedance means so as to regulate the charging current of the capacitor to be a substantially constant value.
Apparatus for charging a capacitor which is connected to a flash tube for selectively discharging said flash tube comprising a source of direct current, a primary switch, variable impedance means connected in series with said primary switch across said capacitor, first control means responsive to the terminal voltage of said capacitor for closing said primary switch, second control means responsive to the terminal voltage of said capacitor for controlling the impedance of said variable impedance means, means for detecting the temperature of said flash tube, and means for inhibiting operation of said first control means when the temperature of said flash tube exceeds a predetermined value.
Apparatus for charging a capacitor which is connected to an electrical device for selectively discharging said electrical device comprising a source of direct current, a primary switch, variable impedance means connected in series with said primary switch across said capacitor, first control means responsive to the terminal voltage of said capacitor for closing said primary switch, second control means responsive to the terminal voltage of said capacitor for controlling the impedance of said variable impedance means, means for detecting the temperature of said electrical device, and means for inhibiting operation of said first control means when the temperature of said electrical device exceeds a predetermined value.
Apparatus for charging a capacitor which is connected to a flash tube comprising a source of direct current, a primary switch, variable impedance means connected in series with said primary switch across said capacitor, first control means responsive to the terminal voltage of said capacitor for closing said primary switch, and second control means responsive to the terminal voltage of said capacitor for controlling the impedance of said variable impedance means so as to regulate the charging current of the capacitor to be a substantially-constant value.
Dependencies are inferred from the claim text.