MBUS calorimeter data acquisition controller receiving circuit

Abstract

The invention relates to an MBUS (Meter-Bus) calorimeter data acquisition controller receiving circuit. The MBUS calorimeter data acquisition controller receiving circuit includes a singlechip, wherein when an MBUS signal receiving end is connected with a divider resistor R13; the MBUS receives a current signal, and the current signal accesses the singlechip after passing through the divider resistor R13 and then passing through a base pin AD_1; a D / A circuit output analog voltage is connected with an SPI interface of the singlechip; the analog voltage accesses an IN+ end of a voltage comparator LM2903; the MBUS signal receiving end is also connected with a sampling resistor R15; the other end of the sampling resistor R15 is grounded; and the MBUS signal receiving end enters an IN- end of the voltage comparator LM2903 through a resistor R18. The MBUS calorimeter data acquisition controller receiving circuit does not cause distortion and entanglement of data signals because of change of load.

Description

technical field [0001] The invention relates to a receiving circuit for a controller, in particular to a receiving circuit for an MBUS heat meter data acquisition controller, belonging to the technical field of control. Background technique [0002] Energy conservation and emission reduction is a major strategic deployment of the country. Heating in winter consumes a lot of heat energy. In the past, the metering method of charging by area was not suitable for the scientific metering of energy, and a lot of energy consumption was wasted. Now the Ministry of Housing and Urban-Rural Development promotes the installation of household heat meters across the country, implements the use of heat on demand, and spends more money for more use, which promotes the efficient use of heat energy. At present, the metering and charging of central heating and heating systems in my country is gradually expanding. , The main metering device in the thermal station is the heat meter. A heat mete...

AI Technical Summary

Problems solved by technology

The MBus receiving circuit is the basis for ensuring its normal operation. In the traditional MBUS heat meter data acquisition control, it is the receiving current loop when receiving signals. The usual method is to use a complete hardware comparator. This method is consistent in load impedance and It is more practical when the load changes little, but in practical applications, the heat meters may come from different manufacturers and have different impedances, and the heat meters often cause changes in the load impedance due to maintenance, stop, start, etc. The current change of the current is much larger than the current change caused by the receiving current, so it directly affects the DC level offset and causes signal waveform distortion

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