Switchmode power supply drawing a sinusoidal current and avoiding input current surges.

摘要

In order to avoid input current surges when plugging in or switching on the switched-mode power supply, or when recharging the switched-mode power supply after a failure in the input mains AC voltage (AC) or after an interruption of the same during operation, the input capacitor (CE) is relocated to the output of the switched-mode power supply. At the same time, a voltage regulator (SPR) is used, which is known per se, is rapidly pulsed as a function of the instantaneous value of the sinusoidal input mains AC voltage supplied to the switched-mode power supply, operates in accordance with the step-down controller principle and is constructed such that a sinusoidal input current is forced to be drawn, such that active current limiting takes place and such that there is mains isolation between its input and output.