Title:
DC/DCコンバータ
Document Type and Number:
Japanese Patent JP4371212
Kind Code:
B2
Abstract:
A DC/DC converter has a transformer having a primary winding (N P ), a secondary winding (N S ), and an auxiliary winding (N B ), a switching transistor (Q1) connected in series to the primary winding, a control transistor (Q2) 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 (D5) having a substantially zero temperature coefficient. The Zener diode (D5) 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 (Q1), the temperature coefficient of the Zener diode (D5) is selected.
Inventors:
Masayuki Hirabayashi
Hirotaka Yamamoto
Eiji Yoshida
Toru Yoshino
Hirotaka Yamamoto
Eiji Yoshida
Toru Yoshino
Application Number:
JP2004016575A
Publication Date:
November 25, 2009
Filing Date:
January 26, 2004
Export Citation:
Assignee:
MITSUMI ELECTRIC CO.,LTD.
International Classes:
H02M3/338; H02M1/10
Domestic Patent References:
| JP60219964A | ||||
| JP8149808A | ||||
| JP2003219636A |
Attorney, Agent or Firm:
Kenho Ikeda
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