Low-power-consumption and immersed type thermal gas flow measuring method and device

A technology of thermal gas flow and low power consumption, which is applied in measuring devices, liquid/fluid solid measurement, flow measurement/mass flow, etc. It can solve the problems of inconvenient DC power supply, wide measurement range, and large energy consumption. To achieve the effect of expanding the scope of use and application fields, reducing power consumption and energy consumption

CN105784035AInactive Publication Date: 2016-07-20CHINA JILIANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2016-07-20
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a low-power-consumption and immersed type thermal gas flow measuring method and device. PWM (pulse-width modulation) control power generated from a single chip microcomputer is output, the device is intermittently in a working state or a dormant state, and power consumption is reduced by shortening the working time of the device. The duty ratio and the output frequency of PWM are decided according to the dynamic response time of a sensor and the signal collection time of the single chip microcomputer. The device is supplied with power by a battery, outputs 3V voltage to a sensor circuit chip, a signal processing circuit chip and the single chip microcomputer for power supply through a voltage-reducing conversion circuit and outputs 6V voltage through a switching voltage stabilizing circuit to be connected to a sensor circuit, the sensor circuit converts a gas flow signal into a voltage signal, then the signal is input into a signal processing circuit and connected to a single chip microcomputer AD terminal after being filtered and amplified, and a flow value is output to an LCD (liquid crystal display) for display after analysis and processing by single chip microcomputer software. Through PWM control and the intermittent working mode of the device, low-power-consumption measurement of gas flow is realized, and the service time of the battery is prolonged.
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Description

technical field

[0001] The invention belongs to the technical field of fluid detection, and relates to a low power consumption immersion type thermal gas flow measurement method and device. Background technique

[0002] Thermal gas flow measurement is a new type of gas flow measurement method. According to the principle of gas heat conduction, the gas flowing through the surface of the thermal sensor will take away part of the heat of the sensor. The relationship between the gas flow and the heat exchange between the thermal sensor is Gas flow can be measured. Thermal gas flowmeters have high measurement accuracy, wide range, and good sensitivity. At the same time, because there are no moving parts, the influence on the gas flow field is small, the pressure loss is low, and the service life is long. Therefore, it is gradually used in petrochemical, semiconductor processing, aerospace and other fields.

[0003] At present, thermal gas flowmeters can be divided into two type...

Examples

Embodiment Construction

[0015] Further illustrate the present invention below in conjunction with accompanying drawing.

[0016] refer to figure 1 As shown, the device of the present invention includes a battery, a step-down conversion circuit, a switch voltage regulator circuit, a sensor circuit, a signal processing circuit, a single-chip microcomputer and an LCD. The device is powered by two 3.6V lithium batteries, which are converted to 6V by a switching regulator circuit and then connected to the sensor circuit. The temperature sensor in the sensor circuit converts the gas flow signal in the pipeline into the voltage signal of the circuit and then connects it to the signal processing circuit. The liquid crystal display LCD is connected to the microcontroller as an external device. The single-chip microcomputer performs AD conversion on the input voltage, and after analysis and processing, the output flow value is sent to the LCD. The switching voltage regulator circuit, the chip in the signal ...