Electricity: power supply or regulation systems – In shunt with source or load – Using choke and switch across source
Reexamination Certificate
2007-05-29
2007-05-29
Vu, Bao Q. (Department: 2838)
Electricity: power supply or regulation systems
In shunt with source or load
Using choke and switch across source
C323S282000, C323S235000
Reexamination Certificate
active
11412012
ABSTRACT:
In a control circuit for controlling a current resonance type DC/DC converter, a negative voltage detection arrangement produces a pulse while a both-ends voltage of a resonance capacitor has a negative voltage. A voltage level error signal generating circuit includes a capacitor which is charged during production of the pulse and generates a voltage level error signal where a voltage level rises. A timer produces a timer signal having a sawtooth waveform where a voltage level gradually rises. An off timing generating circuit compares the timer signal with the voltage level error signal to generate an off timing signal defining a timing for making a short-circuit switch turn off. Responsive to the off timing signal, a driving control signal generating arrangement generates a second driving control signal indicative of turning-off of the short-circuit switch.
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Related U.S. Appl. No. 11/413,557, filed Apr. 28, 2006; Inventor: Endo, Naoto.
Frishauf Holtz Goodman & Chick P.C.
Mitsumi Electric Co. Ltd.
Vu Bao Q.
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