Microcontroller operated with clock frequencies fcpu = 11.0592 MHz. With this frequency, we can set up communication with the computer using USART for different variations of the bit rate with 0% error. In this study, the frequency and phase difference value is stored in the log files using Hyperterminal.
Maximum errors caused by the ADC is 0.1%. While the error caused by the timer can be ignored because it is much more smaller than the error caused by the ADC. So that the value of the frequency of the grid voltage and the value of the phase difference between voltage and current can be displayed in the format of three digits. The value of the frequency range from 35.0 Hz to 70.0 Hz can be displayed with format XX.X Hz, whereas the phase difference value with a range from 0 to 90° shown enough with the format XX°. View the output can be coupled with information that the electric current is in phase, lagging behind the voltage or preceding against to the grid voltage.
The Need for Phase Difference Measuring Instrument
Measure the Frequency of Grid Voltage rather than Measure the Frequency of Current
Voltage and Current Converter
The Signal Conditioning
The use of the microcontroller ADC
Frequency Measurement
Phase Difference Measurement
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Measure the Frequency of Grid Voltage rather than Measure the Frequency of Current
Voltage and Current Converter
The Signal Conditioning
The use of the microcontroller ADC
Frequency Measurement
Phase Difference Measurement
click here for more information
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