| 摘要 |
The circuit has a voltage input (1) for supplying a d.c. voltage (UE), an input transformer (3) with its primary (2) in series with a clocked switching transistor (T1) for generating an a.c. voltage. A clock generator (4) is provided for clocked control of the transistor, and a rectifier circuit (SD) is connected to the transformer secondary (5). A d.c. voltage output (7) is provided. The rectifier circuit contains at least the transmitter diode (SD) of an optical coupler (OK). The light controlled receiver transistor (PT) of the optical coupler is integrated into the clock generator in the primary circuit so that light controlled feedback from the transformer secondary to the primary is achieved, especially to drive the switching transistor according to the power. |
