Stromversorgungseinrichtung mit mehreren parallel geschalteten schaltnetzteilen

摘要

Abstract of the Disclosure The invention relates to a power supply device having several switch-mode power supplies connected in parallel to supply at least one consuming unit, each switch-mode power supply generating an output current I0 and an output voltage U₀(I₀, R_L) that is a function of the output current I₀ and a load resistance R_L, and having a control device for each switch-mode power supply, the control device having a first stage with a P element (54) that receives a P element input voltage which is derived from the output voltage U₀(I₀, R_L), and generates a P element control voltage U_VS, that is used to control the respective switch-mode power supply, the first stage being active when 0 <= I₀ <= I_0P, a second stage having a current reproduction circuit which reproduces the output current I₀ of the respective switch-mode power supply and generates an output current control voltage U_P which is used to control the respective switch-mode power supply, the second stage being active when I_0P <= I₀ <= I_0S, and a third stage having an amplifier circuit which amplifies a signal proportional to the output current I₀ and generates an amplified output current control voltage m.U_S which is used to control the respective switch-mode power supply, the third stage being active when I_0S <= I₀ <= I_K.