Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1978-11-13
1981-04-07
Shoop, William M.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 97, H02M 3335
Patent
active
042610320
ABSTRACT:
A self-oscillating, high voltage DC power supply for a cathode ray tube drive. Included within the high voltage power supply are an oscillator coil connected to a DC supply and transistor switching means connected to the coil between the coil and ground so as to provide a charging circuit for the oscillator coil. Diode means and output filter are connected between the coil and the DC output to provide a smoothing of the ripple of the DC output. Included in the oscillator power supply are a feedback coil inductively coupled to the oscillator coil and wound in the opposite direction. The feedback coil is a part of a base drive circuit for the transistor switch. Included also are feedback resistance in series with the coil and these elements are connected between the base of the switching transistor and ground. The feedback coil operates to open the switch by means of current induced in the base drive circuit when the current in the feedback circuit reaches a predetermined level related to the current in the oscillator coil primary and thus the transistor. The feedback value is selected such that when the transistor switch reaches its saturation limit, it is shut down to prevent any further large currents therethrough which might damage the device and ultimately the cathode ray tube or any other components connected in the high voltage drive circuit. Preferred embodiments of the invention include high voltage regulation in conjunction with the self-oscillating DC drive.
REFERENCES:
patent: 3569779 (1971-03-01), Luursema
patent: 3828239 (1974-08-01), Nagai et al.
patent: 3958168 (1976-05-01), Grundberg
patent: 4073003 (1978-02-01), Chambers
American Optical Corporation
Duggan Jeremiah J.
Schneeberger Stephen A.
Shoop William M.
Spencer Alan H.
LandOfFree
High voltage CRT supply does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with High voltage CRT supply, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High voltage CRT supply will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-292208