Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1989-06-20
1990-01-30
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315399, H01J 2970, H01J 2976
Patent
active
048975800
ABSTRACT:
A transformer coupled amplifier drive circuit (60) and method especially suited for providing a saw-tooth current waveform to an inductive load (32) for horizontal deflection applications in CRT monitors and the like are described. The transformer primary (48) is coupled between the power source connection (11) and the input of the amplifier (26) while the transformer secondary (50) has an opposite polarity terminal coupled to the input of the amplifier (26) through an inductor (52) and the other terminal of the secondary (50) coupled to the common terminal (15) of the amplifier (26) through a diode (56).
When the input switch (44) is closed, the input of the amplifier (26) is energized by a current (65) through the series connected primary (48) and energy is stored in the transformer magnetizing field and in the amplifier (26). Conduction in the transformer secondary (50) is blocked by the diode (56).
When the input switch (44) is opened, the input charging current (65) stops and the collapsing primary magnetizing field produces an oppositely directed current (67) which flows through the secondary winding (50), the diode (56), the series connected inductor (52) and the input to the amplifier (26). The demagnetization energy stored in the transformer (48) cancels the energy stored in the amplifier (26), thereby reducing total dissipation, and the inductor (52) controls the fall time independent of the rise time.
REFERENCES:
patent: 3480826 (1969-11-01), Xenakis
patent: 3501672 (1970-03-01), Xenakis
patent: 4205259 (1980-05-01), Schindler
patent: 4227123 (1980-10-01), Dietz
patent: 4642533 (1987-02-01), Carpenter
patent: 4670692 (1987-06-01), Meigs
Blum Theodore M.
Handy Robert M.
Motorola Inc.
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