Low-power-consumption high-precision heat meter

Abstract

The invention relates to a low-power-consumption high-precision heat meter. The precision of the conventional heat meter generally reaches the national 2-3 level standard, and the conventional heat meter is high in energy consumption. A Wiegand signal acquisition module acquires flow information in a pipeline, and an output end of the Wiegand signal acquisition module is in signal connection with an input / output (I / O) port of a micro control unit (MCU) processing control module; a temperature measurement module respectively acquires the water inlet temperature and the water return temperature, and an output end of the temperature measurement module is in signal connection with the I / O port of the MCU processing control module; an output end of a key control module and an input end of a liquid crystal display module are in signal connection with the I / O port of the MCU processing control module; and a storage module, a valve control module, a read-write card module and an infrared communication module are respectively in signal connection with the I / O port of the MCU processing control module. Parameters of two PT1000 temperature measurement sensors are not required to be matched, the efficiency can be improved, and the precision is improved. By adoption of a 32-bit singlechip with Cortex-M3 kernel design, the power consumption is low.

Description

technical field [0001] The invention belongs to the technical field of instruments and meters, and relates to a low-power consumption high-precision heat meter. Background technique [0002] At the beginning of the 21st century, eight ministries and commissions including the Ministry of Construction proposed a new heat metering method, using a single-household heat billing system for cities with relatively concentrated heating. However, until today, heat meters have not been popularized in a large area. The reason is There are two main aspects: firstly, the measurement accuracy of heat metering is low, and secondly, the core of the heat meter—the calculator circuit consumes too much power. The service life of the heat meter is not long. Now domestic heat meters generally use American MSP430CPU as the calculator circuit, and the calculator circuit is the core of the heat meter. It needs 10-20μA of power consumption in static state, and 40-50μA in normal working state. And t...

AI Technical Summary

Problems solved by technology

[0002] At the beginning of the 21st century, eight ministries and commissions including the Ministry of Construction proposed a new heat metering method, using a single-household heat billing system for cities with relatively concentrated heating. However, until today, heat meters have not been popularized in a large area. The reason is There are two main aspects: firstly, the measurement accuracy of heat metering is low, and secondly, the core of the heat meter—the calculator circuit consumes too much power

The accuracy of many heat meter manufacturers can only reach the national 2-3 standard. Even if some manufacturers can reach the 2 standard accuracy when they leave the factory, after a few years, due to the loss of the battery itself and the high power consumption of the calculator, the electronic circuit cannot Normal work under undervoltage

As a result, the measurement accuracy cannot be guaranteed to be accurate

Images