Regulator fault protection circuit

Details Regulator fault protection circuit Regulator fault protection circuit

1984-05-10

1985-12-31

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

315411, 358243, H02H 320

Patent

active

045625085

ABSTRACT:
A protection circuit for a video display apparatus causes shutdown to occur at substantially the same high voltage level for all fault conditions. The video display apparatus incorporates an SCR regulator and a high voltage transformer tuned to the third harmonic. To counter the effect of shutdown to occur at a higher voltage level for a shorted SCR fault than for other faults, the SCR anode control pulse is processed to provide a signal having different voltage levels for normal SCR operation and shorted SCR operation. The voltage level which occurs during a shorted SCR condition is selected to cause shutdown of the video display apparatus at substantially the same high voltage level as that for other fault conditions.

REFERENCES:
patent: 3858084 (1974-12-01), Manners
patent: 4042859 (1977-08-01), Kashiwagi
patent: 4074323 (1978-02-01), Griffey
patent: 4115814 (1978-09-01), Kosaka et al.
patent: 4145639 (1979-03-01), Willis
patent: 4213166 (1980-07-01), Watanabe
patent: 4236187 (1980-11-01), Mochiyuki et al.

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