Importance

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Abstract

A circuit for providing saw-tooth current, with a trace and a retrace interval, in a coil, in particular a deflection coil of a television kinescope, in which the coil is connected to a retrace condenser and a trace condenser so as to form a deflection circuit which oscillates freely during the retrace interval, is described. In this circuit, a first diode is connected parallel to the deflection circuit with such polarity as to be made conductive by the saw-tooth current during the first part of the trace interval, and the said deflection circuit is also connected parallel, by means of a second diode having such polarity as to be made conductive by the saw-tooth current during a second part of the trace interval, to a controllable switch, which is made conductive during part of the trace interval. The controllable switch is connected, by means of a first inductor, to a supply voltage source so that, during the interval in which the switch is conductive, energy is stored in the first inductor and later transferred, during the interval in which the switch is non-conductive, partly to the deflection circuit, by means of a third diode and partly to a first condenser. The main characteristic of this circuit is that means are provided whereby the energy transferred to the first condenser is subsequently restored to the supply source.

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First Claim