| 摘要 |
<p>PURPOSE: A power device for light sources is provided to improve a switching speed and efficiency by connecting preliminary power sources to a high side of a power circuit. CONSTITUTION: A transformer(T) has a primary winding and a secondary winding to feed a load(L). The primary winding of the transformer is connected to an input line(12). A capacitive divider(C1,C2) is arranged between an input line and a ground of a circuit. A divided point of the capacitive divider is connected to a middle point(20) of the primary winding of the transformer. A preliminary secondary winding of the transformer feeds a control electrode of an electronic switch(14a).</p> |
