Intelligent ammeter for carrier communication by utilizing power line and working method thereof

Abstract

The invention relates to an intelligent ammeter for carrier communication by utilizing a power line and a working method thereof, which relate to a power line carrier communication technology. The intelligent ammeter comprises a main control chip, a metering chip, a carrier communication chip and a carrier sending and receiving circuit, wherein the carrier sending and receiving circuit comprises a sending circuit and a receiving circuit; and the receiving circuit comprises a zero-crossing detection circuit, a sampling amplification circuit, an MCU, a self-adaptive filter circuit and a frequency discriminator. The working method comprises the following steps: 1. circuit standby; 2.1. a working mode 1; 2.2. a working mode 2; 2.2.1. judgment of the existence of a main control signal, and circuit adjustment; 2.2.2. signal receiving; and 2.2.3. communication. The invention is specially designed by aiming at the characteristic of multiple interference signals on the power line and is divided into the sending circuit and the receiving circuit, the receiving circuit is also provided with two correlated blocks, the zero-crossing detection circuit and the sampling amplification circuit are firstly used for catching whether a signal exists or not, and if so, the MCU is used for computation, then the filter circuit is controlled with a pertinence to open a door according to a result, and a control signal is put in, so that the signal is more pure.

Description

technical field [0001] The invention relates to a circuit and working method of an intelligent electric meter which utilizes power line carrier communication technology to exchange data between a user terminal and a master station. Background technique [0002] The low-voltage carrier channel has the characteristics of simple implementation, wide coverage, easy maintenance, zero line cost, and unified power supply and communication medium, which fully improves the resource utilization rate of power lines and frequencies, making low-voltage power line carrier communication technology gain wide attention. , the use of low-voltage power line communication is an ideal way for smart grid information exchange. However, power lines are used to transmit power to electrical equipment, not to transmit data, so power lines have many restrictions on data transmission. Specifically, there are the following aspects: [0003] First, the distribution transformer has a blocking effect on t...

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