H - Electricity – 02 – M
Patent
H - Electricity
02
M
H02M 1/00 (2007.01) H02M 3/22 (2006.01) H02M 3/338 (2006.01)
Patent
CA 2488903
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.
Hirabayashi Masayuki
Yamamoto Hirotaka
Yoshida Eiji
Yoshino Toru
Dennison Associates
Mitsumi Electric Co. Ltd.
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