Multi-channel differential signal monitoring circuit

Abstract

The invention relates to a multichannel differential signal monitoring circuit, which comprises a plurality of differential signal sensors for collecting electrical parameter signals, a measuring chip for receiving the electrical parameter signals, a microcontroller used for processing the data about the electrical parameter signals and a multiplexer. The output end of the differential signal sensor is connected with the input end of the multiplexer; the output end of the multiplexer is connected with the micro-controller by the measuring chip; the selecting and communicating end of the multiplexer is connected with the microcontroller. The microcontroller can control the selection and communication of the differential signal sensor by the multiplexer, so that the differential signal sensor in need can communicate with the measuring chip. The multi-channel differential signal monitoring circuit can use only one measuring chip to monitor a plurality of differential signal sensors for collecting electrical parameter signals, thereby reducing the design cost, simplifying the design complexity, at the same time, saving the space on circuit.

Description

technical field [0001] The invention relates to a signal monitoring circuit, in particular to a monitoring circuit for differential signals. Background technique [0002] In the power control system, voltage sensors and current sensors are often used, such as voltage ratio (Potential Transformer, PT) and current transformer (Current Transformer, CT), which generally convert the induced voltage and current signals into a set of difference The dynamic signal is transmitted to the measurement chip (Meter IC), and the measurement chip monitors the electrical parameter signals such as voltage, current, power, frequency and phase of the power system through the voltage sensor and current sensor, and passes the data The bus is transmitted to a microcontroller (Micro Control Unit, MCU) for preset data processing. [0003] Please refer to figure 1 , is an existing differential signal monitoring circuit, which includes four differential signal sensors 50 for collecting electrical pa...

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Problems solved by technology

[0004] However, when the power system has more monitoring requirements for electrical parameter signals in the circuit system, the number of differential signal sensors to be used will increase accordingly, and the number of measuring chips used in the differential signal monitoring circuit will also increase with As the number of differential signal sensors used increases, this not only increases the design cost, but also increases the complexity of circuit wiring to a certain extent, wasting the use space of the circuit board

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