Power quality analyzer circuit
A power quality analysis, voltage detection circuit technology, applied in the direction of measuring electrical variables, instruments, measuring devices, etc., can solve the problems of the system cannot work normally, power quality pollution, etc., to achieve good anti-interference and reliability, low power consumption , good signal consistency
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[0019] The present invention will be further described below with reference to the drawings and embodiments.
[0020] Such as figure 1 , In the voltage detection circuit, the maximum input voltage U of the grid is 500V. It is hoped that the power on the large resistor RN is the smallest and the loss of the measured signal is small. It is composed of 8 200k resistors of the same model and size in parallel, which can be realized by exclusion. In order to ensure accuracy, the op amp selects AD8512, a dual-channel precision amplifier with low offset voltage, low input bias current, low input voltage noise and low input current noise. The input impedance of the op amp is large and the output impedance is small, which plays a role of isolation in this circuit. The two reversed diodes protect the op amp. Since the chip requires a stable power supply, a capacitor of 10uF and 0.1uF is connected in parallel to filter out high-frequency and low-frequency interference.
[0021] Such as figu...
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Abstract
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