Low power consumption dynamic focusing circuit
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United States of America Patent
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-
Jan 10, 1995
Grant Date -
N/A
app pub date -
Jan 6, 1993
filing date -
Jan 10, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A focus coil for a television is disposed between scanning electron beam generator and a planar screen and has a winding coupled between a power supply and a current sink for providing a magnetic focusing field due to current in the coil. A focusing circuit comprises a resonant circuit coupled to the focus coil for generating a parabolic current in the focus coil to account for variations in the distance between the focusing device and the screen during scanning. The resonant circuit stores a portion of the energy developed during trace intervals and returns this energy to the power supply during retrace intervals. The resonant circuit includes a capacitor and an additional coil, in series with one another, and together in parallel with the focus coil. The additional coil is magnetically coupled to the focus coil and induces a reverse current in the focus coil during the retrace interval for returning energy to the power supply.
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