Self-calibrating universal input port

An illustrative embodiment disclosed herein is a circuit for sensing heating, ventilation, air conditioning, and refrigeration (HVACR) equipment. The circuit includes an input port that has an input voltage signal. The circuit includes an analog-to-digital converter (ADC) generating a first digital...

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Bibliographische Detailangaben
Hauptverfasser:	Sterjo, Denis, Schantzen, Michael J, Freund, Mark G
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS CONTROL OR REGULATING SYSTEMS IN GENERAL CONTROL OR REGULATION THEREOF CONTROLLING CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY FUNCTIONAL ELEMENTS OF SUCH SYSTEMS GENERATION MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS PHYSICS REGULATING TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Beschreibung
Zusammenfassung:	An illustrative embodiment disclosed herein is a circuit for sensing heating, ventilation, air conditioning, and refrigeration (HVACR) equipment. The circuit includes an input port that has an input voltage signal. The circuit includes an analog-to-digital converter (ADC) generating a first digital signal based on receiving a representation of a supply voltage, generating a second digital signal based on receiving the divided input voltage signal, and outputting the first digital signal, the second digital signal, and an output voltage reference. The circuit includes an amplifier coupled to the ADC and amplifying the output voltage reference to generate a supply voltage. The circuit includes a microprocessor coupled to the ADC and configured to calculate a first ratio of the first digital signal and the supply voltage. The microprocessor is configured to determine the input voltage signal by calculating a second ratio of the second digital signal and the first ratio.