Polyphase electric energy meter
AssigneeTexas Instruments Deutschland GmbH
InventorVolker Rzehak
Life of this patent
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Abstract
A polyphase electric energy meter is provided that includes a microcontroller with a front end that converts analog current input signals and analog voltage input signals to digital current and voltage samples for processing by the microcontroller. The front end includes separate input channels, each for one of the current input signals with a sigma-delta modulator followed by a decimation filter. The front end further includes a common input channel for all voltage input signals with a multiplexer, an analog-to-digital converter and a de-multiplexer. The separate input channels and the common input channel provide the digital current and voltage samples for processing by the microcontroller.
Claims7
A polyphase electric energy meter, comprising:
- a microcontroller with a front end that converts analog current input signals and analog voltage input signals to digital current and voltage samples for processing by the microcontroller, the front end including:
- separate input channels, each for one of the current input signals and having a high resolution analog-to-digital converter;
- and
- a multiplexer combining all voltage input signals into a common input channel to an another analog-to-digital converter and a de-multiplexer connected to the another analog-to-digital converter, wherein the separate input channels and the common input channel provide the digital current and voltage samples for processing by the microcontroller.
Dependencies are inferred from the claim text.