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

1988-08-31

1989-09-12

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Power supply from deflection circuit source

358190, 363 21, H01J 2970

Patent

active

048663530

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.

REFERENCES:
patent: 4213166 (1980-07-01), Watanabe
patent: 4823248 (1989-04-01), Ikeuchi et al.

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