SELF-TUNING CURRENT TRANSFORMER
An electricity usage monitor may include a coupling component to attach the electricity usage monitor to an electrical circuit to monitor electricity usage of the electrical circuit, an analog-digital converter (ADC) configured to convert analog current readings captured by the electricity usage monitor into digital values, a processor operably coupled to the ADC, and a non-transitory, computer-readable medium operably coupled to the processor and comprising instructions which, when executed by the processor, cause the processor to perform operations. The operations may include determining a standard deviation of the digital values, based on the standard deviation, adjusting a gain of the ADC, and transmitting a signal to a server comprising the digital values.
1 . An electricity monitoring device comprising:
a coupling component to engage the electricity usage monitor device in position relative to an electrical source to capture readings of electricity of the electrical source;
conversion circuitry configured to generate digital values from readings captured by the electrical monitoring device;
transmission circuitry;
processing circuitry configured to:
determine a distribution metric of the digital values;
update, according to the distribution metric, a conversion metric utilized by the conversion circuitry in generation of later digital values; and
transmit, by the transmission circuitry, a communication comprising the digital values and the updated conversion metric.
2 . The device of claim 1 , wherein the processing circuitry is configured to determine the distribution metric by determining a standard deviation of the digital values.
3 . The device of claim 1 , wherein the processing circuitry determines the distribution metric by determining an average of values associated with the electrical measurement samples.
4 . The device of claim 3 , wherein the processing circuitry updates the conversion setting by centering a mapping of digital values on the average.
5 . The device of claim 1 , wherein the processing circuitry updates the conversion setting by updating a gain used by an analog-digital converter of the remote measurement device.
6 . The device of claim 1 , wherein the processing circuitry updates the conversion setting by selecting a range of measurement values associated with digital buckets of an analog-digital converter.
7 . The device of claim 1 , wherein the conversion-state information includes one or more of: a gain value, a range value, a lookup-table identifier, and bucket information.
8 . The device of claim 1 , wherein the digital communication includes digital bucket values associated with the digital values.
9 . The device of claim 1 , wherein the processing circuitry is configured to receive from the computing system, via the transmission circuitry, an acknowledgement associated with the conversion-state information before use of the updated conversion setting.
10 . The device of claim 1 , wherein the processing circuitry is configured to determine an updated distribution metric from later digital values and update the conversion setting again based on the updated distribution metric.
11 . A method of electricity usage monitoring, comprising:
obtaining, at a remote measurement device, digital representations of electrical measurement samples of electricity associated with an electrical path;
determining, from the digital representations, a distribution metric for the electrical measurement samples;
updating, according to the distribution metric, a conversion setting used to generate later digital representations;
generating a digital communication that includes at least a portion of the digital representations and conversion-state information associated with the conversion setting; and
transmitting the digital communication to a computing system that determines measurement values from the digital representations according to the conversion-state information.
12 . The method of claim 11 , further comprising obtaining the electrical measurement samples from a current transformer coupled to a conductor of the electrical path.
13 . The method of claim 11 , wherein determining the distribution metric includes determining a standard deviation of the digital representations.
14 . The method of claim 11 , wherein determining the distribution metric includes determining an average of values associated with the electrical measurement samples, and updating the conversion setting includes centering a mapping of digital values on the average.
15 . The method of claim 11 , wherein updating the conversion setting includes updating a gain used by an analog-digital converter of the remote measurement device.
16 . The method of claim 11 , wherein updating the conversion setting includes selecting a range of measurement values associated with digital buckets of an analog-digital converter.
17 . The method of claim 11 , wherein the conversion-state information includes one or more of: a gain value, a range value, a lookup-table identifier, and bucket information.
18 . The method of claim 11 , wherein the digital communication includes digital bucket values associated with the digital representations.
19 . The method of claim 11 , including receiving, from the computing system, an acknowledgement associated with the conversion-state information before use of the updated conversion setting.
20 . The method of claim 11 , including determining an updated distribution metric from later digital representations and updating the conversion setting again based on the updated distribution metric.