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Low-Cost/High-Precision Smart Power Supply for Data Loggers

Author

Listed:
  • Marcio L. M. Amorim

    (Group of Metamaterials Microwaves and Optics (GMeta), Department of Electrical Engineering (SEL), University of São Paulo (USP), Avenida Trabalhador São-Carlense, Nr. 400, Parque Industrial Arnold Schimidt, São Carlos CEP 13566-590, SP, Brazil)

  • Gabriel Augusto Ginja

    (Group of Metamaterials Microwaves and Optics (GMeta), Department of Electrical Engineering (SEL), University of São Paulo (USP), Avenida Trabalhador São-Carlense, Nr. 400, Parque Industrial Arnold Schimidt, São Carlos CEP 13566-590, SP, Brazil)

  • João Paulo Carmo

    (Group of Metamaterials Microwaves and Optics (GMeta), Department of Electrical Engineering (SEL), University of São Paulo (USP), Avenida Trabalhador São-Carlense, Nr. 400, Parque Industrial Arnold Schimidt, São Carlos CEP 13566-590, SP, Brazil)

  • Melkzedekue Moraes Alcântara Moreira

    (Department of Mechancial Engineering (SEM), University of São Paulo (USP), Avenida Trabalhador São-Carlense, Nr. 400, Parque Industrial Arnold Schimidt, São Carlos CEP 13566-590, SP, Brazil)

  • Adriano Almeida Goncalves Siqueira

    (Department of Mechancial Engineering (SEM), University of São Paulo (USP), Avenida Trabalhador São-Carlense, Nr. 400, Parque Industrial Arnold Schimidt, São Carlos CEP 13566-590, SP, Brazil)

  • Jose A. Afonso

    (CMEMS-UMinho, University of Minho, 4800-058 Guimarães, Portugal
    LABBELS—Associate Laboratory, Braga/Guimarães, Portugal)

Abstract

This paper presents a low-cost/high-precision smart power supply for application on data loggers. The microprocessor unit is the brain of the system and manages the events and was optimized to provide electrical energy to the electronic devices under normal operation and under the presence of disruptive events. The measurements showed that when switching either from battery to AC or from AC to battery, neither caused the shutdown of the power supply nor affected the behavior of the power supply. The power supply was able to charge 80% of the battery on a fast recharge of 1 h and the remaining 20% on a slow recharge of 2 h. The current allocated to the battery did not affect the operation of the power supply. The tests also showed that the power supply was able to transmit relevant information about its operation to external computers through a serial connection. This information includes the voltages at the battery and at the output of the voltage regulators, the voltage level of the AC network, the level of the battery charge and if it was being recharged, the current being drained, the internal temperatures at two locations (one measured on the resistor that limits battery charge and another measured on the output diode of the regulators), and whether the cooling system is being used. The total cost of this smart power supply is less than $150, demonstrating good potential for its popularization.

Suggested Citation

  • Marcio L. M. Amorim & Gabriel Augusto Ginja & João Paulo Carmo & Melkzedekue Moraes Alcântara Moreira & Adriano Almeida Goncalves Siqueira & Jose A. Afonso, 2022. "Low-Cost/High-Precision Smart Power Supply for Data Loggers," Energies, MDPI, vol. 16(1), pages 1-27, December.
    • Handle: RePEc:gam:jeners:v:16:y:2022:i:1:p:278-:d:1016352
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    References listed on IDEAS

    as
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