Shutdown circuit for CRT high voltage system

Details Shutdown circuit for CRT high voltage system Shutdown circuit for CRT high voltage system

1986-08-26

1988-06-28

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Power supply from deflection circuit source

358243, H01J 2970

Patent

active

047542063

ABSTRACT:
A shutdown circuit for a CRT deflection and high voltage system includes a magnetic core having a one turn sensing coil in series with the emitter-collector of the horizontal output transistor that supplies the CRT deflection means and high voltage generator. A one turn pickup coil is also coupled to the magnetic core and develops a signal responsive to the load current in said transistor. The signal is rectified and supplied to the base-emitter junction of a switch transistor having its emitter-collector path connected between the junction of the power supply fuse and a B+ voltage terminal and ground. In the event of a fault in the load supplied by the horizontal output transistor, the switch transistor is driven conductive to place a short circuit across the B+ voltage terminal to rapidly blow the fuse.

REFERENCES:
patent: 4058754 (1977-11-01), Ohnishi et al.
patent: 4074323 (1978-02-01), Griffey
patent: 4185234 (1980-01-01), Baker
patent: 4234829 (1980-11-01), Willis

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