An MBUS master station signal processing apparatus and an apparatus having the same

Abstract

A MBUS mast station signal processing device is disclosed. The MBUS master station signal processing device comprises a PID signal conditioning circuit unit, an input terminal of which is connected with an MBUS bus, and is used for collecting a current modulated signal from the MBUS bus, filtering and amplifying the modulated current sampling signal, and outputting the current modulated signal. Acomparator circuit unit, the input end of which is connected with the output end of the PID signal conditioning circuit unit, for receiving the modulated current sampling signal output from the PID signal conditioning circuit unit, shaping the modulated current sampling signal, converting the modulated current sampling signal into a TTL level signal, and outputting the modulated current sampling signal; and a digital signal processing unit having an input terminal connected to an output terminal of the comparator circuit unit for receiving a TTL level signal output from the comparator circuitunit, identifying and decoding the TTL level signal. The invention amplifies and filters the modulated current sampling signal by adding a PID signal conditioning circuit unit, which is helpful to enhance the anti-interference ability of the MBUS bus.

Description

technical field [0001] The invention relates to a signal processing device, in particular to a signal processing device of an MBUS master station and equipment with the same. Background technique [0002] MBUS (instrument bus; Meter BUS) master station is a new type of bus structure, the main feature is to simultaneously supply power and transmit serial data through two stepless transmission lines, and each slave station (confirmed with a different ID) is connected in parallel to the MBUS on the bus. The processing method of the current signal Imc input from each slave station to the MBUS master station is simple, for example, after only DC blocking or simple high-pass filter processing, the comparator or AD sampling is used for processing. These signal processing methods have the following four disadvantages: [0003] First, the input impedance of the processing circuit is not large enough, which affects the sampling accuracy of the received signal to a certain extent; se...

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Problems solved by technology

[0003] First, the input impedance of the processing circuit is not large enough, which affects the sampling accuracy of the received signal to a certain extent; second, the resistance to power frequency noise interference or electromagnetic noise interference generated in the field environment is weak, and MBUS communication errors in harsh environments Third, the MBUS received signal has not been amplified, so a larger sampling resistance value is required at the sampling end of the received signal, which will generate greater power loss; fourth, the signal level is converted to When the TTL signal level is used, the design margin of the reference level terminal of the comparator is small, and the anti-interference ability is weak

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