SWITCHING CIRCUIT FOR HORIZONTAL SIGMOID CORRECTION CAPACITOR AND HORIZONTAL SIGMOID DISTORTION CORRECTING DEVICE USING THE SAME

摘要

PURPOSE: To use a switching element with low breakdown strength by connecting a diode with the switching element serially connected with a sigmoid correction capacitor in parallel, and connecting the anode with the sigmoid correction capacitor. ;CONSTITUTION: At the time of interruption of a control switch 15, an NPN transistor 12 is turned off, and a sigmoid correction capacitor 10 is connected with a diode 11, and the diode 11 is conducted. Afterwards, a positive charge charged to a sigmoid correction capacitor 9 starts to run to a horizontal deflection yoke 4 from the later half start of deflection, and simultaneously a voltage V₁ starts to decrease. At that time, the diode 11 is turned into an interrupted state, and a voltage V, also starts to decrease from a voltage 0 similarly to the voltage V₁. At the time of the interruption of the control switch 15, the highest voltage of the voltage V₀ is clamped to 0V. Therefore, voltage peak values impressed to the both sides of the switching element decrease, and the switching element with the low breakdown strength can be used.;COPYRIGHT: (C)1994,JPO