Electric power conversion systems – Current conversion – With starting arrangement
Reexamination Certificate
2006-04-11
2008-10-28
Han, Jessica (Department: 2838)
Electric power conversion systems
Current conversion
With starting arrangement
C323S274000, C323S284000, C323S353000
Reexamination Certificate
active
07443702
ABSTRACT:
A start up circuit for power converters is presented. It includes a JFET transistor, a resistive device, a first transistor, a second transistor and a diode. The JFET transistor is coupled to a voltage source. The first transistor is connected in serial with the JFET transistor to output a supply voltage to a control circuit of the power converter. The diode is connected from a transformer winding of the power converter to supply a further supply voltage to the control circuit of the power converter. The second transistor is coupled to control the first transistor and the JFET transistor in response to a control signal. The resistive device provides a bias voltage to turn on the JFET transistor and the first transistor when the second transistor is turned off. Once the second transistor is turned on, the first transistor is turned off and the JFET transistor is negative biased.
REFERENCES:
patent: 6125046 (2000-09-01), Jang et al.
patent: 6865093 (2005-03-01), Disney
patent: 7082020 (2006-07-01), Friedrichs et al.
patent: 2007/0236274 (2007-10-01), Huang et al.
patent: 2007/0247225 (2007-10-01), Huang et al.
Huang Chih-Feng
Yang Ta-Yung
Han Jessica
Rosenberg , Klein & Lee
System General Corp.
LandOfFree
High voltage start up circuit for power converters does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with High voltage start up circuit for power converters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High voltage start up circuit for power converters will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3997816