Electricity meter
AssigneeSiemens Aktiengesellschaft
InventorKlaus Windsheimer
Life of this patent
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Abstract
The invention relates to an electricity meter with signal channels that are passed to a digital signal processing device and each of which has a multiplexer with downstream analog/digital converter. Voltage signals of an electrical consumer can be connected to a first input of the analog/digital converter of the first signal channel, and current signals of the electrical consumer can be connected to a first input of the analog/digital converter of the second signal channel. In order to allow the meter to be used without any circuit variation both as a four-conductor meter and as a three-conductor meter, one of the voltage signals can be connected to a second input of the analog/digital converter of the first signal channel.
Claims13
An electricity meter, comprising:
- a digital signal processing device;
- first and second signal channels each connected to said digital signal processing device;
- a first analog/digital converter connected in said first signal channel and having a first input receiving voltage signals of an electrical consumer, and a second input, said first input and said second input together forming a difference input of said first analog/digital converter;
- a second analog/digital converter connected in said second signal channel and having a first input receiving current signals of the electrical consumer;
- and
- a changeover switch connected upstream of said second input of said first analog/digital converter for selectively passing one of the voltage signals or a neutral conductor signal to said second input.
Dependencies are inferred from the claim text.