| 摘要 |
<p>The present invention relates to a converting unit for converting two or more DC voltage levels from the input of the converting unit to a DC voltage on the output of the converting unit, wherein the converting unit comprises controllable switch means capable of connecting and disconnecting the individual DC input voltage level to form an oscillation signal, and wherein the converting unit comprises filtering means for low-pass filtering of the oscillation signal to form the DC voltage on the output of the converting unit. The filtering means comprise a self-induction and a capacitance, and the self-induction is positioned between the switch means and the output so that when the oscillation signal changes from a first voltage level to a second lower voltage level, the self-induction obtains energy from the energy source with the second voltage level because of the stored magnetic energy of the self-induction.</p> |
