Switching device for S correction capacitors

Details Switching device for S correction capacitors Switching device for S correction capacitors

1995-08-16

1997-12-30

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315408, H01J 2970, H01J 2976

Patent

active

057034443

ABSTRACT:
A switching device for S correction capacitors includes parallel-arranged branches, each having a series arrangement of an S correction capacitor (Cs) and a switch (S). At one side, the parallel branches are coupled to a horizontal deflection coil (Lh). The switches (S) are controlled by a microcomputer (13) for switching S correction capacitors (Csi) parallel in dependence upon a repetition frequency of horizontal synchronizing pulses (Hs). A hardware frequency detector (11) supplies frequency information (V) related to the horizontal synchronizing pulses (Hs). A frequency change detector (12) coupled to the hardware frequency detector supplies an attention pulse (AP) to an interrupt input (INT) of the microcomputer (13) when a change of the frequency information (V) has been detected.

REFERENCES:
patent: 4789811 (1988-12-01), Hulshof
patent: 5155417 (1992-10-01), Tateishi
patent: 5325025 (1994-06-01), Gawell et al.

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