| 摘要 |
PURPOSE:To eliminate the need of an AC boosting transformer of a low frequency and to miniaturize the unit by providing a soft start circuit for raising a rectifying output as a periodic function by a prescribed sequence signal. CONSTITUTION:A modulation 3 is applied by a low frequency f1 to a driving signal of a primary side of a high frequency converter transformer T1, and a rectifying output of a secondary side of the transformer Tl is short-circuited to a ground by the low frequency f1. Also, by detecting the rectifying output of the secondary side of the converter transformer T1, an electric conduction of the primary side is obstructed, and also, by detecting a load current by the secondary side, the electric conduction of the primary side is obstructed, and the rectifying output is raised gradually. In such a way, an AC boosting transformer of a low frequency becomes unnecessary, and the unit can be miniaturized. |
