Capacitor charging circuit and strobe apparatus comprising same

Details Capacitor charging circuit and strobe apparatus comprising same Capacitor charging circuit and strobe apparatus comprising same

2007-12-18

2007-12-18

Chen, Shih-Chao (Department: 2821)

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

C315S274000, C315S24100S

Reexamination Certificate

active

11087108

ABSTRACT:
A capacitor charging circuit does not include a Zener diode and makes it possible to integrate a large number of circuits and elements within a semiconductor integrated circuit. The capacitor charging circuit includes a flyback transformer having a primary coil, a secondary coil, and a tertiary coil, a switching element that turns the current that flows through the primary coil on and off, a capacitor that is charged by a current produced in the secondary coil through the on-off action of the switching element, and a charge control circuit that controls the on-off action of the switching element. When the switching element is off and a voltage produced at a first end of the tertiary coil is larger than a reference voltage corresponding to the predetermined voltage of the charge voltage of the capacitor, the on-off action of the switching element is stopped.

REFERENCES:
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Official Communication issued in corresponding Japanese Patent Application No. 2004-097415, dated Aug. 29, 2006.
Official communication issued in the counterpart Japanese Application No. 2004-97415, mailed on Jan. 25, 2007.

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