| 摘要 |
PURPOSE:To realize high-voltage stability without separating a horizontal output circuit and a high-voltage output circuit by providing a high-voltage variation detection winding in a flyback transformer and varying the capacity of the resonance circuit of a primary horizontal system. CONSTITUTION:A high voltage drops as a beam current increases, so the voltage of the high-voltage variation detection winding 18 also drops. When the voltage of a power source +B4 drops, the balance with a bias +B2 applied to a noninverted input terminal is lost and its differential part is amplified without inversion to lower the base potential of a pulse width control transistor (TR)17. Consequently, the base-collector impedance increases and the capacity of a resonance capacitor 3 decreases, so the collector output of a horizontal output TR16 decreases in pulse width and increases in crest value. Thus, the secondary winding voltage of the flyback transformer rises to obtain the high-voltage stability. |
