Battery-powered intelligent differential pressure flowmeter

Abstract

The utility model relates to a battery-powered intelligent differential pressure flowmeter, which comprises a microcontroller M261, and a power supply module, an LCD (liquid crystal display) display module, a key input module, a communication module and a sensor module which are respectively connected with the microcontroller M261, the power supply module comprises two switchable power supply modes, namely an external photovoltaic voltage input mode and a built-in lithium battery mode, and a power supply stably outputs voltage for the microcontroller M261 to use through a low dropout regulator LDO; the sensor module comprises a differential pressure sensor, a compensation pressure sensor, a flow medium compensation temperature sensor and an NTC sensor. The differential pressure sensor, the compensation pressure sensor and the flow medium compensation temperature sensor are connected with differential amplification circuits respectively, the three differential amplification circuits are connected with the microcontroller M261 through the analog-to-digital converter, and the NTC sensor is connected with the microcontroller M261 through the analog-to-digital converter. Two power supply modes are supported, flexible use is facilitated, the power consumption of the whole machine is effectively reduced due to the circuit design, and the working time of the battery is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to a novel intelligent instrument and meter technical field, especially a battery power supply intelligent differential pressure flowmeter. BACKGROUND

[0002] At present in the industrial process control field, the intelligent differential pressure flowmeter mostly adopts DC 24V power supply, and with the expansion of application field, many application occasions cannot provide commercial power, so DC 24V cannot be obtained through commercial power, how to solve the above technical problems in these occasions, the utility model provides a kind of power input scheme based on battery power supply, simultaneously supports photovoltaic power supply priority, for the development of intelligent differential pressure flowmeter.

[0003] In addition, since the intelligent differential pressure flowmeter is high in collection accuracy and real-time requirement, and the operation amount is large, cannot enter hibernation state for a long time, and the service life of battery is short, how to prolong the working time of battery becomes the main difficulty of the whole design.

[0004] Therefore, the utility model provides a kind of battery power supply intelligent differential pressure flowmeter. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a kind of battery power supply intelligent differential pressure flowmeter, supports external photovoltaic voltage input and built-in battery two power supply modes, is convenient for flexible use, and circuit design effectively reduces the whole machine power consumption, realizes the prolongation of battery working time.

[0006] To realize the above-mentioned purpose, the technical scheme of the utility model is as follows: a kind of battery power supply intelligent differential pressure flowmeter, including microcontroller M261, and the power module, LCD display module, key input module, communication module and sensor module connected with microcontroller M261 respectively;

[0007] The power module includes two kinds of switchable power supply modes of external DC 5-12V photovoltaic voltage input and built-in lithium battery, and the power supply is stabilized by low dropout linear regulator LDO to output 3.3V voltage for microcontroller M261;

[0008] The sensor module includes differential pressure sensor, compensation pressure sensor, flow medium compensation temperature sensor and NTC sensor;Wherein, the differential pressure sensor, compensation pressure sensor and flow medium compensation temperature sensor are respectively connected with differential amplification circuit, and the three differential amplification circuits are connected with microcontroller M261 through analog-to-digital converter, and the NTC sensor is connected with microcontroller M261 through analog-to-digital converter.

[0009] Preferably, the key input module includes a plurality of magnetic control keys, to set parameters through magnetic control keys.

[0010] Preferably, the communication module comprises an RS485 communication module outside the system bus.

[0011] Preferably, the communication module further comprises a BC20 wireless communication module outside the antenna.

[0012] Preferably, the lithium battery adopts an ER34615-3.6V battery.

[0013] Preferably, the differential pressure sensor and the compensation pressure sensor adopt a single-crystal silicon composite pressure differential pressure sensor.

[0014] Preferably, the analog-to-digital converter adopts a successive approximation type analog-to-digital converter SAR ADC.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] The utility model discloses a low-power RS485 communication circuit design, low power consumption, supports the MCU hibernate communication wake -up, and can pass through the power supply of MCU control ADC, does not supply power when not gathering, to effectively reduce the whole machine power consumption, 4 way AD acquisition signal passes through the channel gating switch in the inside of MCU, realizes 1 way ADC time -sharing acquisition 4 way analog signal, simplifies the acquisition circuit, supports external photovoltaic voltage input and built -in battery two power supply modes, utilizes photovoltaic power supply as the supplement of battery power supply, can effectively prolong the service life of battery, the utility model discloses supporting 1 way RS485 communication interface as data remote transmission interface, reserves 1 way RS485 communication interface to be convenient for according to the need and other instrument communication, expands and forms small -size internet of things network system, also can extend the connection wireless communication module, realizes the wireless remote transmission of data. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 It is the module connection drawing of the utility model,

[0018] Fig. 2 It is the circuit connection drawing of the utility model. DETAILED DESCRIPTION

[0019] The technical scheme of the utility model is specifically explained below. Figs. 1-2 The technical scheme of the utility model is specifically explained below.

[0020] The utility model discloses a battery power supply intelligent differential pressure flowmeter, including microcontroller M261, and power module, LCD display module, key input module, communication module and sensor module who are connected with microcontroller M261 respectively,

[0021] The utility model discloses a based on ARM Cortex-M23 core's ultralow power microcontroller M261 as main control chip, this chip embeds 512KB Flash, 96KB SRAM, carries out data storage through the FLASH of MCU built -in, and the power consumption is about 97uA under normal operation mode 2.8uA, and the power consumption is less than 2uA under the power -off mode, and the whole machine power consumption is less than 10uA under the hibernation state, is suitable for the internet of things application of battery power supply, the utility model discloses low -power pen segment type wide temperature type LCD screen is used as the display unit of man -machine interaction.

[0022] The power module includes external DC 5-12V photovoltaic voltage input and built-in lithium battery two switchable power supply modes, and the power supply stably outputs 3.3V voltage for the microcontroller M261 through the low-dropout linear regulator LDO.

[0023] The sensor module includes a differential pressure sensor, a compensated pressure sensor, a flow medium compensation temperature sensor, and an NTC sensor; the differential pressure sensor, the compensated pressure sensor, and the flow medium compensation temperature sensor are respectively connected with differential amplification circuits, and the three differential amplification circuits are connected with the microcontroller M261 through an analog-to-digital converter; and the NTC sensor is connected with the microcontroller M261 through the analog-to-digital converter.

[0024] The differential pressure sensor, the compensated pressure sensor, and the flow medium compensation temperature sensor detection signals are amplified through the differential amplification circuits and ADC channel gating, and are collected by the ADC to the MCU for digital processing; the NTC sensor thermistor detects the use environment temperature of the pressure sensor, and is used for multi-section temperature compensation correction of the differential pressure and pressure detection signals. The MCU can control the on-off of the power supply switch of the ADC acquisition driving circuit according to needs, and no power supply is provided when no acquisition is performed, so that the overall machine power consumption is effectively reduced.

[0025] The key input module includes a plurality of magnetic control keys, and the magnetic control keys can be used to set relevant parameters on site.

[0026] The communication module includes an RS485 communication module and an external system bus. A low-power RS485 communication circuit is adopted, power consumption is low, and MCU sleep communication wake-up is supported. The MODBUS RTU communication protocol is supported, and other communication protocols (such as the -A11-GRM instrument communication protocol dedicated to oil and gas production) can be extended and designed according to user needs, to facilitate user use.

[0027] The communication module further includes a BC20 wireless communication module with an external antenna.

[0028] The lithium battery adopts an ER34615-3.6V battery.

[0029] The differential pressure sensor and the compensation pressure sensor adopt a single crystal silicon compound pressure differential pressure sensor.

[0030] The analog-to-digital converter adopts a successive approximation type analog-to-digital converter (SAR ADC).

[0031] The utility model discloses a built-in black box record function, power failure data does not lose, and the automatic timing saves the measured data.

[0032] The above is the preferred embodiment of the utility model, and any change made according to the technical scheme of the utility model, as long as the functional effect generated does not exceed the range of the technical scheme of the utility model, belongs to the protection scope of the utility model.

Claims

1. A battery powered smart differential flow meter, characterized in that, The microcontroller M261, and a power module, an LCD display module, a key input module, a communication module and a sensor module connected with the microcontroller M261 respectively; The power module includes two switchable power supply modes of external DC 5-12V photovoltaic voltage input and built-in lithium battery, and the power supply outputs 3.3V voltage through a low dropout linear regulator LDO to stabilize the microcontroller M261; The sensor module includes a differential pressure sensor, a compensated pressure sensor, a flow medium compensation temperature sensor and an NTC sensor; wherein the differential pressure sensor, the compensated pressure sensor and the flow medium compensation temperature sensor are respectively connected with a differential amplification circuit, and the three differential amplification circuits are connected with the microcontroller M261 through an analog-to-digital converter.

2. A battery powered smart differential flow meter according to claim 1, wherein, The key input module includes a plurality of magnetic control keys for parameter setting through the magnetic control keys.

3. A battery powered smart differential flow meter according to claim 1, wherein, The communication module includes an RS485 communication module connected with a system bus.

4. A battery powered smart differential flow meter according to claim 3, wherein, The communication module further includes a BC20 wireless communication module connected with an external antenna.

5. A battery powered smart differential flow meter according to claim 1, wherein, The lithium battery adopts an ER34615-3.6V battery.

6. A battery powered smart differential flow meter according to claim 1, wherein, The differential pressure sensor and the compensated pressure sensor adopt a single-crystal silicon composite pressure differential pressure sensor for compounding.

7. A battery powered smart differential flow meter according to claim 1, wherein, The analog-to-digital converter adopts a successive approximation type analog-to-digital converter SAR ADC.

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