| 摘要 |
PURPOSE:To reduce an energy consumption by connecting two serial connected diodes to the output part of a B class push-pull amplifying circuit and obtaining an output from the connection midpoint of the diodes. CONSTITUTION:To the output parts of B class push-pull amplifying circuits 16 and 17, two serial connected diodes 7 and 8 are inserted, the output is obtained from the connection midpoint of the diodes 7 and 8, and simultaneously, a capacitor 6 is provided between the connection midpoint and a group. The capacitor 6 is resonated with the inductance of an electromagnetic yoke 4 based on the initial current of the electromagnetic yoke 4 according to the sudden change of an input signal in a horizontal fly-back period and generates a fly- back pulse voltage. The voltage is a positive polarity in a screen upper part, and it is generated at the amplitude several-fold that of positive side power voltages of the circuits 16 and 17. The voltage is a negative polarity in a screen lower part, and it is generate at the magnitude several-fold that of negative side power voltages. At such a time, each of the diodes 6 and 7 is cutoff- operated, the output voltage is made to exceed the power voltage, and consequently, the energy consumption can be reduced. |
