Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Reexamination Certificate
2005-02-08
2005-02-08
Riley, Shawn (Department: 2838)
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
C363S056120, C363S049000, C363S021180
Reexamination Certificate
active
06853563
ABSTRACT:
The present invention provides a primary-side flyback power converter that supplies a constant voltage output and a constant current output. To generate a well-regulated output voltage under varying load conditions, a PWM controller is included in the power converter in order to generate a PWM signal controlling a switching transistor in response to a flyback voltage sampled from a first primary winding of the power supply transformer. Several improvements are included in this present invention to overcome the disadvantages of prior-art flyback power converters. Firstly, the flyback energy of the first primary winding is used as a DC power source for the PWM controller in order to reduce power consumption. A double sample amplifier samples the flyback voltage just before the transformer current drops to zero. Moreover, an offset current is pulled from a detection input of the double sample amplifier in order to generate a more accurate DC output voltage. The offset current is generated in response to the temperature in order to compensate for temperature-induced voltage fluctuations across the output rectifier. Ultimately, in order to maintain a constant output current, the PWM controller modulates the switching frequency in response to the output voltage.
REFERENCES:
patent: 4975823 (1990-12-01), Rilly et al.
patent: 6118675 (2000-09-01), Lionetto et al.
patent: 6233161 (2001-05-01), Balakrishnan et al.
patent: 6434021 (2002-08-01), Collmeyer et al.
patent: 6480399 (2002-11-01), Balakrishnan et al.
patent: 6538908 (2003-03-01), Balakrishnan et al.
Chen Chern-Lin
Lin Jenn-yu G.
Yang Ta-yung
J.C. Patents
Riley Shawn
System General Corp.
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