| 摘要 |
The subject-matter of the invention is an electronic switched-mode power supply for the regulated power supply of an electrical load and of an AC or DC voltage source at a different voltage level. The electronic switched-mode power supply contains a flyback converter which is pulsed in a primary manner and in which the primary winding of a transformer is connected in series with a controllable semiconductor switch, and whose secondary winding is connected in series with an electrical load and a diode. The current-flowing phase of the controllable semiconductor switch is determined by means of a second controllable semiconductor switch whose selection is determined via the voltage which is dropped on an emitter impedance which is connected in series with the switching path of the first controllable semiconductor switch. The emitter impedance is composed of a fixed impedance and a controllable impedance, whose impedance value is determined via a low-pass filter which is connected in the connection between the switching path of the first controllable semiconductor switch and the load. The resulting total emitter impedance is thus increased as the operating voltage rises, the peak current is reduced, and the secondary current is hence made linear.
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