HIGH VOLTAGE STABILIZING CIRCUIT

PURPOSE:To attain a stable high voltage without a change in the picture amplitude due to a change in an anode current by providing a circuit dividing an anode voltage with resistors and a circuit comparing the divided voltage output with a reference voltage, amplifying the difference and applying a...

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Bibliographic Details
Main Author SEKO KAZUYUKI
Format Patent
LanguageEnglish
Published 22.05.1992
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PICTORIAL COMMUNICATION, e.g. TELEVISION
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Summary:PURPOSE:To attain a stable high voltage without a change in the picture amplitude due to a change in an anode current by providing a circuit dividing an anode voltage with resistors and a circuit comparing the divided voltage output with a reference voltage, amplifying the difference and applying a DC voltage to a secondary winding of a flyback transformer to the title circuit. CONSTITUTION:When an anode voltage Eb is decreased and an output of a high voltage detection circuit 13 is decreased, an output voltage VIC11 of an operational amplifier IC 11 is decreased. Accordingly a collector current of a transistor(TR) Q12 is decreased, an emitter voltage of a TR Q13 rises and a collector current of a TR Q14 is decreased, a collector voltage VQ14C of the TR Q14 rises to make the anode voltage stable. Since a voltage is not enough in a power supply generating circuit 15 by a method of smoothing the collector voltage of the TR Q11, another tap is provided to a secondary winding of a flyback transformer FBT and its tap voltage is smoothed.
Bibliography:Application Number: JP19900272568