Transformerless switching circuit for driving a horizontal outpu

Details Transformerless switching circuit for driving a horizontal outpu Transformerless switching circuit for driving a horizontal outpu

1984-08-17

1985-08-13

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315397, H01J 2970, H01J 2976

Patent

active

045352739

ABSTRACT:
A transformerless switching circuit is described for rapidly turning a horizontal output transistor off and on in response to horizontal rate input pulses. The switching circuit includes a first transistor which is rendered alternately conductive and non-conductive by the input pulses, a second transistor which supplies base drive to the horizontal output transistor in response to the first transistor being conductive, and a third transistor which turns off the horizontal output transistor rapidly in response to the first transistor being non-conductive. The conduction level of the second transistor is controlled by temperature compensating means such that base drive to the horizontal output transistor is varied to compensate for temperature induced current gain changes in the output transistor, thereby holding the latter transistor to a substantially constant saturation current.

REFERENCES:
patent: 3434004 (1969-03-01), Smeulers et al.
patent: 3470484 (1969-09-01), Gates
patent: 3688154 (1972-08-01), Christopher
patent: 4052645 (1977-10-01), Fujita
patent: 4096416 (1978-06-01), Henley
patent: 4227123 (1980-10-01), Dietz

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