![]() Found a wonderful and fairly inexpensive analogue. Īfter testing, they had plans to produce their own power supply module for IoT devices, even drew a 3D model:īut, just in case, did a search for analogues. Satisfied with the test results, we felt very smart, but also “smart cry”. The output voltage of 3.3 volts during the entire discharge time of the battery was kept at the level of 3.28 – 3.29 volts.The initial battery voltage is 4.1 volts.Duration of continuous work 10 hours 30 minutes.Tests are performed in the same conditions except: for completeness of testing the power supply is connected to the controller ESP12.OLED_V1 through input 3V3. 2 Battery version of the power supply of the controller ESP12.OLED_V1 As an electrochemical source, install a Li-Ion AA battery with a capacity of 800 mA / h (3.7 volts). The output voltage of 5 volts is kept at the level of 5 ± 0.1 volts at all times.The initial voltage on the battery is 1.53 volts. ![]() Duration of continuous work 5 hours 20 minutes.To control the discharge process, the batteries plus batteries were connected to the ADC (ADC) of the controller, and the measurement results were recorded in Log. The power supply is connected to the controller via a 5 volt input. The tests were performed under the power supply of the controller ESP12.OLED_V1, which consumes 60 mA. To the output of 5 volts connect a 3.3 volt stabilizer. For testing, the cheapest AA salt battery (1.5 volts) was installed without a charging module.Ī DCDC Booster is connected to the battery output, which converts 1.5 volts to 5 volts. Option A: Power supply from one galvanic cell. At the output of the voltage stabilizer module we get 3.3 volts, load current (without radiator) 500 mA.įig.1 Battery version of the power supply of the controller ESP12.OLED_V1 Power supply testing for IoT devices.We do not recommend repeating this scheme (see conclusions and recommendations) Warning! According to the characteristics of MT3608, the minimum level of input voltage = 2 V, but the test showed a good result at a voltage of 1.5 V. Thanks to the use of the module to increase the voltage from 2 to 5 volts, we convert it into a stable output voltage of 5 volts.Control of charging of Li-Ion batteries on the popular TP4056 chip, charge current up to 1 A.1, resulting in a layout of the power supply with the following characteristics: To simplify the creation of a prototype power supply purchased two more modules, which combined, as shown in Fig. ![]() The whole circuit of the converter consists of a chip, two resistors, a choke and a capacitor. It is convenient that the chip has a feedback pin for the output voltage stabilization loop. This document provides a diagram of a converter with an output voltage of 5 volts. The reader will find it in the dataheet ( /media/MT3608.pdf ). It does not make sense in this publication to give a diagram of the converter. We have selected and successfully tested the MT3608 chip. On the other hand, there is a fairly large pool of devices that need to have 5 volts to power.Īround this problem with the inconvenient voltage level of lithium batteries and accumulators developed a whole segment of chips – DC / DC converters, whose task is to increase or decrease the voltage from 2.8 to 4.1 Volts so as to obtain a stabilized voltage of standard levels. The desire to make the device as simple and miniature as possible suggested: “put a Li-Ion battery and a linear stabilizer to convert the battery voltage to 3V3 and that’s it!” It did not work because the battery voltage is too low to effectively stabilize during battery discharge time. Moreover, we had to violate this principle, because the datasheet of manufacturers deserves the highest trust. Our principle – not to copy other people’s decisions, threw us work in the process of developing a universal and optimal power supply module. The idea of this article arose as a result of development of the battery power supply unit of the X-ray meter ( GGreg20 detector plus controller ESP12.OLED_V1 ).ĭevelopers demanding quality solutions in the development of electronic devices will agree with the statement that a quality power supply module for IoT devices can cost more than the rest of the device.
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