Arrangement for reducing ringing in a flyback transformer

Details Arrangement for reducing ringing in a flyback transformer Arrangement for reducing ringing in a flyback transformer

H - Electricity

04

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350/109

H04N 5/63 (2006.01) H04N 3/18 (2006.01)

Patent

CA 1300744

RCA 85,045 ABSTRACT A diode is coupled to a low voltage end terminal of a tertiary high voltage winding of a horizontal flyback transformer. The diode is back biased during trace and during a portion of the second half of retrace by a voltage that is coupled to the diode through a resistor from a B+ voltage source. When the diode is back biased, the resistor dampens parasitic ringing current in the tertiary winding caused by the leakage inductance of the transformer. During a portion of retrace, occuring prior to the time the diode is back biased, the diode is conductive and bypasses the resistor. This prevents the resistor from increasing the output impedance at the ultor terminal.

589980

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