| US 7,573,153 B2 | ||
| Power supply apparatus for field devices | ||
| Carsten Rebbereh, Fürth (Germany) | ||
| Assigned to Siemens Aktiengesellschaft, München (Germany) | ||
| Filed on Dec. 14, 2006, as Appl. No. 11/610,773. | ||
| Claims priority of application No. 10 2005 061 845 (DE), filed on Dec. 23, 2005. | ||
| Prior Publication US 2008/0143190 A1, Jun. 19, 2008 | ||
| Int. Cl. H02J 3/14 (2006.01) | ||
| U.S. Cl. 307—38 [307/113] | 9 Claims |
| 1. An apparatus for supplying DC power to input terminals of at least one field device operating on AC power via a single
AC power cable, comprising:
a multi-pole main switch having an input side receiving an AC voltage from a power mains and an output side supplying a switched
AC voltage to output terminals of the apparatus;
an AC power cable connecting the output terminals to the at least one field device;
a DC voltage supply device having an input side receiving the AC voltage from the power mains and a DC voltage output side;
a two-pole switch switchably connecting the DC voltage output side to two wires of the AC power cable, wherein the multi-pole
main switch and the two-pole switch are ganged so as to supply only one of the switched AC voltage and the DC voltage to the
at least one field device over the AC power cable.
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