Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1977-09-21
1979-08-14
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315397, H01J 2970, H01J 2972
Patent
active
041646886
ABSTRACT:
A deflection amplifier for driving a magnetic-deflection cathode-ray tube in a digital plotter has two switching circuits coupled to low- and high-voltage supplies respectively. An error amplifier compares the actual deflection-coil current, as indicated by the voltage developed across a resistor in series with the coil, with the command input voltage indicating the required current. As long as the difference between required and actual currents is less than a predetermined threshold value, only the low-voltage switching circuit operates, thereby limiting power dissipation. However, if the current difference exceeds the threshold value for at least 2.mu.s, the high-voltage switching circuit commences operation to supplement the drive provided by the low-voltage circuit. The high-voltage circuit is limited by logic circuitry to periods of operation 20.mu.s long with a 5.mu.s quiescent period between each. The low- and high-voltage supplies are bipolar, and corresponding bipolar threshold values are provided.
REFERENCES:
patent: 3628083 (1971-12-01), Holmes
patent: 3934173 (1976-01-01), Korver
patent: 3983452 (1976-09-01), Bazin
Blum Theodore M.
Novack Martin M.
Sherman William R.
The Solartron Electronic Group Limited
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