| 摘要 |
PURPOSE:To make it possible to give a base current which is proportional to a collector current, by providing a transformer for current feedback and making the oscillating frequencly constant in the range from no load to the full load. CONSTITUTION:In the current feedback transformer T3, a winding nf3 is connected to a collector of a transistor Q2 and to a primary winding n2 of a conversion transformer T1, and a winding nf4 is cnnected to a switching transistor Q1 and a promary winding n1 of the conversion transformer T1. Base current supplying windings nf5 and nd6 are connected to the bases and the emitters of the transistors Q2 and Q1. In this constitution, the oscillating frequency is determined by a driving transformer 12, the base current required to saturate the transistor can be sufficiently supplied by the current feedback transformer T3 regardless of the oscillating frequency, and the oscillating frequency can be kept at a constant value under any loading condition. |
