Abstract
A high-precision data sampling AC load analysis system is designed based on the core of ARM cortex M3 microcontroller named NXP LPC1500. The hardware composition, circuit design of each hardware part and the software design of the system are discussed in detail. The voltage, frequency, energy (W-h), harmonic current and current curve are also added into the analysis system. The circuit diagram of the functional part of the main circuit is provide, and the flow chart of the software design for the microcontroller are given. The experimental data show that the system works stably and reliably in actual application.
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