Charging circuit for energy storage capacitors
AssigneeOce-Nederland B.V.
InventorJosephus A. van den Eijnden
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Abstract
The present invention describes a charging circuit for energy storage capacitors which is especially useful in charging the energy storage capacitors used to provide the voltage supply of flashlamps in photocopying machines. The charging circuit has two series-connected d.c. converters and a current limiting device. The current limiting device has a measuring circuit for determining the current through the second d.c. converter, which is related to the output current of the first converter, and a regulating circuit for regulating the output current of the first d.c. converter and thus indirectly regulating the output current of the second d.c. converter.
Claims7
A charging circuit for energy storage capacitors comprising a high voltage d.c. constant current source formed by a first and a second d.c. converter, and a current limiting device wherein (a) the first converter has a controllable output current which is fed to the second converter;
- (b) the second converter is connected in series with the energy storage capacitor and the first converter, and delivers a charging current at a high voltage to the energy storage capacitor;
- and (c) the current limiting device includes a measuring circuit for monitoring the current through the second converter, which current is proportional to the output current of the first converter, and sending a signal to a regulating circuit connected to the first converter which regulates the output current of the first converter and thereby regulates the output current of the second converter.
Dependencies are inferred from the claim text.