Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Reexamination Certificate
2006-10-17
2006-10-17
Laxton, Gary L (Department: 2838)
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
C363S021160, C363S097000
Reexamination Certificate
active
07123488
ABSTRACT:
A DC/DC converter has a transformer having a primary winding, a secondary winding, and an auxiliary winding, a switching transistor connected in series to the primary winding, a control transistor for turning the switching transistor on or off, and a feedback control circuit connected to the control transistor and the auxiliary winding. The feedback control circuit includes a Zener diode having a substantially zero temperature coefficient. The Zener diode has a Zener voltage which lies in a range between 5 volts and 6 volts. In order to cancel a temperature characteristic of the control transistor, the temperature coefficient of the Zener diode is selected.
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Hirabayashi Masayuki
Yamamoto Hirotaka
Yoshida Eiji
Yoshino Toru
Frishauf Holtz Goodman & Chick P.C.
Laxton Gary L
Mitsumi Electric Co. Ltd.
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