| 摘要 |
Ringing in both the horizontal and vertical sections of a magnetic deflection yoke in a cathode ray tube system is eliminated by inserting a toroidal transformer in the low frequency axis deflection circuit. The flow of the common mode current is through one winding of the transformer, thence through the low frequency axis yoke winding and out of the transformer in the opposite direction through a second winding. The two windings through which the common mode current flows are balanced and series opposing and therefore no common mode signal is transferred to the third winding of the transformer. However, when an extraneous or unwanted signal is generated by the high frequency retrace signal through capacitance coupling between the horizontal and vertical windings, this unwanted signal is transferred from the two windings through which the common mode current flows to the third winding in the transformer. Thus, the two windings act as a primary to the third winding. Connected across the third winding is a variable resistor which can be adjusted to critically damp the ringing of the magnetic deflection circuits. |
