| 摘要 |
PURPOSE:To make always stable and low-loss oscillation possible without being influenced by input power voltage. CONSTITUTION:This power circuit is equipped with a self-oscillating circuit, which consists of a resonance circuit making use of the primary winding L1 of a transformer 1, a switching element 2 connected in series to this, and a feedback winding L3 connected to the gate of the switching element 2, a capacitor, which is connected to an input power source through a resistor 13, and bias control circuits 12 and 14, which are interposed between the junction between the resonance circuit and the switching element 2 and the bias point VB of a capacitor 15. Moreover, it is equipped with negative voltage generating circuits L31, 32, 33, and 34 for obtaining the negative voltage induced in the tertiary winding L31 of a transformer 1. The obtained negative voltage is interposed on the bias voltage VB. |
