Beam current limiting circuit for use in a video projector

Details Beam current limiting circuit for use in a video projector Beam current limiting circuit for use in a video projector

2005-08-30

2005-08-30

Miller, John (Department: 2614)

Television

Cathode-ray tube display beam current control

C348S379000, C348S377000, C315S381000

Reexamination Certificate

active

06937288

ABSTRACT:
In a beam current limiting circuit for a video projector, an average current is limited under closed loop control containing an anode current detection circuit5. On the other hand, a cathode current detection circuit107comprises a first resistor and a second resistor in series to a cathode current circuit and detects a cutoff current at the voltage across the first resistor and an average current at the voltage across the second resistor. An offset addition circuit11is provided for correcting the detection value of the average current based on the maximum value of detected cathode current, and beam current is limited. Further, means15for detecting time change of anode current is provided and if the current value does not change for a long time, the beam current is limited to a smaller value.

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