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发明公开
CN105675978A 一种宽量程电能表及其电流通道自适应调整方法 无效 - 驳回

一种宽量程电能表及其电流通道自适应调整方法
摘要：
本发明公开了一种宽量程电能表及其电流通道自适应调整方法，其中，所述电能表包括一组用于测量小电流信号的第一采样互感器CT1、一组用于测量大电流信号的第二采样互感器CT2、一个电子开关MUX、一个计量芯片以及一个MCU单片机；所述计量芯片的信号输入端通过电子开关MUX分别与所述第一采样互感器CT1和第二采样互感器CT2连接；所述MCU单片机通过带有DMA传输功能的SPI总线和所述计量芯片通信连接；所述的MCU单片机通过I/O口和电子开关MUX相连，用于控制电子开关MUX的开关切换。本发明为多量程测量，在1(100)A全范围内尤其是基本电流5％的测量点以下的电流也能精确计量。
摘要（英）：

The invention discloses an electric energy meter with wide range and an adaptive adjusting method of current channel thereof. The electric energy meter comprises a group of first sampling mutual inductors CT1 which are used for measuring small current signals, a group of second sampling mutual inductors CT2 which are used for measuring large current signals, an electronic switch MUX, a metering chip, and a MCU single chip microcomputer; a signal input end of the metering chip is connected to the first sampling mutual inductors CT1 and the second sampling mutual inductors CT2 through the electronic switch MUX; the MCU single chip microcomputer is connected with the metering chip in a communication mode through a SPI bus with DMA transmission function; the MCU single chip microcomputer is connected with the electronic switch MUX through an I/O interface and is used for controlling the switching over of the electronic switch MUX. The electric energy meter has a wide range; current within full-range of 1(100) A and especially current under 5% measuring point of the basic current can be accurately measured.

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