High voltage generator

Details High voltage generator High voltage generator

1988-04-05

1989-04-18

Salce, Patrick R.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 21, 315411, 358190, H02M 3335, H04N 563

Patent

active

048232483

ABSTRACT:
High voltage generators are generally arranged to step up flyback pulses from a horizontal deflection circuit by means of a flyback transformer consisting of a primary low voltage coil and a secondary high voltage coil, rectifying the high voltage output through a rectification circuit for application to the anode of a cathode-ray tube. However, such a flyback transformer construction has an inherent drawback that the voltage of the high voltage output is varied by variations in the high voltage output current due to leakage inductance, resulting in load fluctuations. To overcome this problem, the high voltage generator is provided with a tertiary coil for generating an output voltage corresponding to 1
of the maximum variation of the load fluctuations, a summing control circuit for controlling the rate of the high voltage output to be additively supplied to the secondary coil from the tertiary coil on the basis of a variation detection signal from a high voltage, variation detector circuit which serves to detect the load fluctuations, and a multiplying circuit for multiplying the voltage received from the summing control circuit by n-times for supply to the low voltage end of the secondary coil, thereby stabilizing the voltage of the high voltage output substantially at a constant level irrespective of the variations in the high voltage output current.

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