Duty-cycle controlled inverter power supply for a television rec

Details Duty-cycle controlled inverter power supply for a television rec Duty-cycle controlled inverter power supply for a television rec

1981-07-29

1983-03-22

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Power supply from deflection circuit source

H01J 2970

Patent

active

043777767

ABSTRACT:
In an inverter power supply, the main current paths of first and second transistors are coupled in a push-pull arrangement to a source of direct voltage and to the primary winding of a power transformer. The on-off switching of the conduction in the main current paths develops an alternating polarity voltage across the primary winding to develop a supply voltage across a secondary winding of the power transformer. A control circuit for the two transistors produces the on-off switching at a nominal fifty percent duty cycle. A signal representative of the current in the main paths of the two transistors is developed. In response to this signal, the duty cycle of the on-off switching is adjusted so as to oppose changes in the amplitude of the current in the main current paths and so as to oppose changes in the duty-cycle switching away from the nominal fifty percent.

REFERENCES:
patent: 2896146 (1959-07-01), Jenkins
patent: 3967182 (1976-06-01), Scott
patent: 4103356 (1978-07-01), Finlay
patent: 4176304 (1979-11-01), Scott
patent: 4237403 (1980-12-01), Davis
patent: 4240013 (1980-12-01), Wedam
patent: 4319315 (1982-03-01), Keeney et al.

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