High-precision current sampling circuit of intelligent electric meter
A current sampling and smart meter technology, which is applied to indicate the existence of current/voltage, change the range circuit, and measure electrical variables, etc. It can solve the problems of reducing sampling accuracy, limited current acquisition channels of measurement units, and complicated implementation methods.
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[0027] specific implementation plan
[0028] The present invention as Figure 1-4 As shown, the smart meter includes an MCU (the main chip MCU adopts V9811), and the MCU is equipped with a differential amplifier group, and the differential amplifier group includes a differential amplifier 1 for collecting live wire current and a differential amplifier 2 for collecting neutral wire current; and The first differential amplifier and the second differential amplifier are respectively connected with wide metering current sampling circuits.
[0029] The wide metering current sampling circuit is a shunt current sampling circuit, and the shunt current sampling circuit includes a shunt CM, a resistor R1, a resistor R2, a capacitor C1, a capacitor C2, an analog switch K1, an analog switch K2, an analog switch K3 and Analog switch K4;
[0030] The shunt CM has a shunt interface 1 and a shunt interface 2, the rear of the shunt interface 1 is connected to the inlet of the analog switch K...
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