Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Reexamination Certificate
2006-12-19
2006-12-19
Patent, Rajnikant B. (Department: 2838)
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
C363S021150, C323S282000
Reexamination Certificate
active
07151681
ABSTRACT:
A multiple-sampling circuit is proposed for measuring a voltage signal and a discharge time of a transformer. Sampling signals are used for generating hold voltages by alternately sampling the reflected voltage from the transformer. A buffer amplifier generates a buffer voltage from the higher voltage of hold voltages. A sampling switch periodically conducts the buffer voltage to produce a voltage-feedback signal. The voltage-feedback signal is proportional to an output voltage of the switching circuit. A threshold signal added to the reflected voltage signal produces a level-shift reflected signal. A discharge-time signal is generated as the switching signal is disabled. The discharge-time signal is disabled once the level-shift signal is lower than the voltage-feedback signal. The pulse width of the discharge-time signal is therefore correlated to the discharge time of the transformer. The sampling signals are enabled to generate hold voltages only when the discharge-time signal is enabled.
REFERENCES:
patent: 4302803 (1981-11-01), Shelly
patent: 5841643 (1998-11-01), Schenkel
Hung Guo-Kiang
Lin Jenn-yu G.
Yang Ta-yung
J.C. Patents
Patent Rajnikant B.
System General Corp.
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