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The diagram below outlines the topology and major internal components of a fully assembled system. The system consists of
two independent sections, each of them provides four output slots which can be populated by any combination of output
modules (OP-A, OP-B, OP-C, OP-D). The remaining components in the block diagram are housed in the input stage of each
section.
Both the input stages are responsible for receiving the AC mains line voltage and converting it to an appropriate DC voltage
whilst providing protection from AC line disturbances and preventing excessive EMI emissions and current harmonics. The
integrated EMI filters attenuate high frequency current emissions to levels below EN55022 class B. They also provide single
pole fusing in the live conductor (L) and protection from line disturbances as outlined in EN61000.
The power unit inrush current is controlled by a resistive element present on each input section upon initial connection to the
AC line. Once the internal capacitances have been charged, the resistive elements are bypassed to reduce losses.
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