Flyback transformer circuit with a noise cancelling circuit

Details Flyback transformer circuit with a noise cancelling circuit Flyback transformer circuit with a noise cancelling circuit

1986-04-04

1987-08-25

Salce, Patrick R.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 45, 315411, 358190, H02M 3355, H04N 563, H01J 2970

Patent

active

046897305

ABSTRACT:
In a flyback transformer circuit for a cathode-ray tube of the type arranged such that secondary windings of the flyback transformer are isolated from an a.c. power source, a positive terminal of at least one secondary winding of the flyback transformer is connected via a capacitor or a series circuit of a capacitor and a parallel circuit of a resistor and a coil to a terminal which is coupled with the commercial a.c. power source via low impedance in connection with high frequency. With the provision of the capacitor or the series circuit including the capacitor, the potential at the positive terminal of the secondary winding is made equal to that at the commercial a.c. power source in connection with high frequency components, and thus the flyback pulse appearing at the positive terminal of the secondary winding has the same polarity and substantially the same peak value as that appearing at the above-mentioned terminal. As a result noise caused from flyback pulses is effectively prevented from entering the ground line or earth to avoid undesirable phenomena caused from such noise.

REFERENCES:
patent: 4531181 (1985-07-01), Herz et al.

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