Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1978-04-11
1979-07-31
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315399, H01J 2970, H01J 2976
Patent
active
041631790
ABSTRACT:
A circuit for providing saw-tooth current with a trace and retrace interval in a coil, in particular a deflection coil of a television kinescope, in which the coil is connected to a trace and retrace condenser with which it forms a resonant circuit, is described. In this circuit, a first diode is connected in parallel to the resonant circuit with such polarity that it is made conductive by the saw-tooth current during the first part of the trace interval, and the resonant circuit is also connected, through a second diode, to a controllable switch, which is made conductive at least during that last part of the trace interval, the second diode being connected with such polarity that it is made conductive by the saw-tooth current during the last part of the trace interval. The controllable switch is connected to a supply voltage source through a first inductor and part of the energy stored in the first inductor, during the interval in which the controllable switch is conductive, is transferred, during the retrace interval, to the resonant circuit through a third diode. The main characteristic of this circuit is that means are provided, connected in series to the second diode, the controllable switch, and the first diode, and a first condenser connected in series between the first diode and the second diode, to produce, at least during the conduction interval of the controllable switch, a d.c. voltage with substantially the same amplitude but with opposite polarity to the voltage produced at the terminals of the first condenser.
REFERENCES:
patent: 3365608 (1968-01-01), Grundmann et al.
patent: 3436591 (1969-04-01), Grundmann
patent: 3795835 (1974-05-01), Aldrich et al.
patent: 3906307 (1975-09-01), Van Hattum
Farina Attilio
Zappala Giuseppe
Blum Theodore M.
Indesit Industria Elettrodomestici Italiana S.p.A.
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