CN207600537U - Temperature sensing circuit in a kind of gas meter, flow meter table of MCU power supplies - Google Patents
Temperature sensing circuit in a kind of gas meter, flow meter table of MCU power supplies Download PDFInfo
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- CN207600537U CN207600537U CN201721631655.4U CN201721631655U CN207600537U CN 207600537 U CN207600537 U CN 207600537U CN 201721631655 U CN201721631655 U CN 201721631655U CN 207600537 U CN207600537 U CN 207600537U
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Abstract
The utility model discloses temperature sensing circuits in a kind of gas meter, flow meter table of MCU power supplies, it is related to gas metering technical field, including MCU Main Processing Unit and temperature collection circuit, temperature collection circuit includes power input, signal output end, temperature sensor, switching tube and first resistor, temperature sensor includes first interface and second interface, first interface couples power input, and second interface is grounded by first resistor；Switching tube base stage couples the second interface of temperature sensor, switch pipe collector coupling signal output end, switching tube emitter ground connection.The utility model is using electronic circuit to having carried out temperature-compensating in gas meter, flow meter, it is independently-powered to temperature collection circuit progress using MCU Main Processing Unit while temperature-compensating is carried out, integrated circuit is simple and temperature collection circuit is being powered without external power supply, reduces the power consumption of integrated circuit.
Description
Technical field
The utility model is related to gas metering technical field, temperature detection in specially a kind of gas meter, flow meter table of MCU power supplies
Circuit.
Background technology
With the continuous development in gas meter, flow meter market, intelligent gas meter technology is gradually ripe and as mainstream.Intelligence in recent years
Table standard system is further perfect, and the cry that user market carries out intelligent meter temperature-compensating is higher and higher, and gas meter, flow meter company starts
Pay close attention to the new advancement of compensation schemes.What temperature-compensating first had to consider is the selection of compensation way, existing rank
Duan Yingyong it is more mature be Built-in mechanical gas temperature conversion equipment and the hot type gas meter, flow meter based on heat exchange principle.
Measurement accuracy of the Built-in mechanical gas temperature conversion equipment when carrying out temperature-compensating can be warm in itself by combustion gas
The influence of degree, and the bigger measurement of temperature departure is more inaccurate；And the hot type gas meter, flow meter of hot type exchange principle is not used at present not
There is relevant measurement standard, it is still necessary to be possible to carry out large area implementation for a long time.No matter using Built-in mechanical gas temperature
The hot type gas meter, flow meter that conversion equipment still uses heat exchange principle is spent, temperature-compensating all exists certain insufficient.
At present, also there are many gas meter, flow meter companies using electronic circuit to carrying out temperature-compensating in gas meter, flow meter, but generally use
Power consumption all complex in the circuit of temperature-compensating and that generation is larger.
Utility model content
The purpose of this utility model is to provide for temperature sensing circuit in a kind of gas meter, flow meter table of MCU power supplies, utilizes electricity
Sub-circuit is to having carried out temperature-compensating in gas meter, flow meter, using MCU Main Processing Unit to temperature acquisition while temperature-compensating is carried out
Circuit progress is independently-powered, and integrated circuit is simple and temperature collection circuit is being powered without external power supply, reduces whole
The power consumption of body circuit.
In order to achieve the above-mentioned object of the invention, the utility model employs following technical scheme：A kind of gas meter, flow meter of MCU power supplies
Temperature sensing circuit in table, including MCU Main Processing Unit and temperature collection circuit, the temperature collection circuit is used to acquire residing combustion
The temperature of combustion gas and pulse signal is sent out in gas meter to MCU Main Processing Unit, and the MCU Main Processing Unit is to the pulse signal that receives
Handled to obtain the temperature value of combustion gas in gas meter, flow meter；The temperature collection circuit includes power input and signal output end,
The power input couples MCU Main Processing Unit, is the electric energy that temperature collection circuit provides for transmitting MCU Main Processing Unit；Institute
Signal output end coupling MCU Main Processing Unit is stated, for sending the pulse signal that temperature collection circuit is sent out to MCU master control lists
Member；The temperature collection circuit further includes temperature sensor, switching tube and first resistor, and the temperature sensor includes first
Interface and second interface, the first interface couple power input, and second interface is grounded by first resistor；The switching tube
Base stage couples the second interface of temperature sensor, switch pipe collector coupling signal output end, the switching tube emitter ground connection.
MCU Main Processing Unit is powered by power input to temperature collection circuit, and temperature collection circuit is collected
Temperature information be converted to pulse signal MCU Main Processing Unit sent to by signal output end.Temperature collection circuit work when institute
The power supply needed is directly provided by MCU Main Processing Unit, and in the case where normal power supply works, temperature collection circuit is by residing gas meter, flow meter
In the temperature information of combustion gas be detected and acquire, carry out converting backward MCU Main Processing Unit sending out corresponding pulse signal,
MCU Main Processing Unit is identified to receiving pulse signal, obtains the temperature information of combustion gas.
Further, temperature sensing circuit further includes a power supply, the supply coupling MCU Main Processing Unit, for MCU
Main control unit is individually powered.A power supply is provided only in gas meter, flow meter table in temperature sensing circuit, power supply is connected to MCU Main Processing Unit
On power to MCU Main Processing Unit, MCU Main Processing Unit carried out under the power supply of power supply work so as to by power input to temperature
Acquisition Circuit is powered, and realizes that only there are one the power consumptions that power supply power supply reduces integrated circuit.
Further, the switching tube base stage couples the second interface of temperature sensor, second resistance by second resistance
The power consumption of temperature collection circuit can further be reduced, there are junction capacity due to switching tube base stage and collector both ends, reduce base
Electrode current can improve the conducting speed of switching tube, reduce the wave distortion of signal output end.
Further, the switch pipe collector couples power input by 3rd resistor, by signal amplification circuit
Pulse signal amplitude and the electrical level match of MCU Main Processing Unit afterwards, there is no the risks of damage MCU Main Processing Unit I/O port.
Preferably, the MCU Main Processing Unit is coupled by the first I/O port and the power input, and MCU Main Processing Unit leads to
It crosses the second I/O port and couples the signal output end.
Preferably, the output current value of first I/O port is higher than 1mA.
Preferably, the switching tube is NPN type triode.
Compared with prior art, temperature sensing circuit in the gas meter, flow meter table of the MCU power supplies of above-mentioned technical proposal, tool are employed
It has the advantages that：
1st, this programme uses low power dissipation design, is directly powered using MCU Main Processing Unit for temperature collection circuit, does not need to volume
Outer power switch circuit, therefore can substantially reduce unnecessary energy waste, and save the space of PCB.
2nd, the utility model is compensated using electronic temp, and the fuel gas temperature in residing gas meter, flow meter can be carried out accurately
Detection to realizing the compensation of measurement error in the case of different temperatures, realizes precisely metering, avoids mechanical temperature compensation measurement
The problem of error is big.
3rd, the utility model can substitute hot type gas meter, flow meter and carry out high-precision temperature acquisition and be converted into working condition
The status of criterion has measurement standard compared to hot type gas meter, flow meter, can large area popularize.
4th, stink damp present in combustion gas, which knows from experience the perishable part of corrosion metal device, surface-mounted device pad etc., needs gluing
It prevents from failing, the temperature collection circuit in the utility model is independently mounted at by way of injection in watchcase, is directly sampled
Fuel gas temperature, component are connect with wiring board by conducting wire, solve device corrosion-resistant problem.
5th, the component used in the temperature collection circuit in the utility model and connection mode are simple, are being produced and right
Electronic circuit is more convenient when being packaged with gluing and saves the time.
Description of the drawings
Fig. 1 is the circuit diagram of temperature sensing circuit embodiment in the gas meter, flow meter table of the utility model MCU power supplies；
Fig. 2 is the module diagram of the present embodiment.
Specific embodiment
The utility model is described further below in conjunction with the accompanying drawings.
Temperature sensing circuit in the gas meter, flow meter table of MCU power supplies as shown in Figure 1, including MCU Main Processing Unit and temperature acquisition
Circuit, temperature collection circuit are used to acquire the temperature of combustion gas in residing gas meter, flow meter and send out pulse signal to MCU Main Processing Unit,
MCU Main Processing Unit is handled to obtain the temperature value of combustion gas in gas meter, flow meter to the pulse signal received；Temperature collection circuit packet
Include power input and signal output end, power input coupling MCU Main Processing Unit, for transmitting MCU Main Processing Unit as temperature
The electric energy that Acquisition Circuit provides；Signal output end couples MCU Main Processing Unit, for the pulse signal for sending out temperature collection circuit
Send MCU Main Processing Unit to；Temperature collection circuit further includes temperature sensor, switching tube and first resistor, temperature sensor
Including first interface and second interface, first interface coupling power input, second interface is grounded by first resistor；Switching tube
Base stage couples the second interface of temperature sensor, switch pipe collector coupling signal output end, the switching tube emitter ground connection.
Whole system is made of MCU Main Processing Unit and temperature collection circuit.Temperature collection circuit passes through with MCU Main Processing Unit
Two I/O ports are connected, and an I/O port provides power supply for temperature collection circuit, and an I/O port is connect as input port in the form of interruption
The voltage pulse of shrinkage temperature Acquisition Circuit output.When the I/O port that power input is connected puts high, temperature collection circuit starts
Work, temperature collection circuit single work period up to 104ms.After temperature acquisition, it can stop after I/O port is set low
It only powers for circuit, it is meant that the frequency of temperature sampling can be changed by software, while effectively reduced needed for temperature sampling
Power consumption.Electric energy needed for temperature collection circuit work is provided by the arbitrary GPIO of MCU Main Processing Unit, and the I/O port electric current of MCU is defeated
As long as the acquisition of temperature can be realized higher than 1mA electric currents for output capacity.
It is illustrated in figure 2 the module diagram of the present embodiment, the temperature sensing circuit in the present embodiment further includes an electricity
Source, supply coupling MCU Main Processing Unit are served only for powering to MCU Main Processing Unit.Wherein, power supply by more than 3V lithium/alkali electricity or
3V low voltage differences source of stable pressure forms.
Temperature sensor U1 and resistance R1 converts for signal, under conditions of temperature sensor both ends pressure difference is ensured,
Generated in each sampling period with the relevant current impulse of temperature, go here and there the suitable resistance R1 of a resistance value in current supply circuit at this time
Current impulse is converted into voltage pulse, is sampled convenient for AD.Electric signal amplitude by temperature sensor U1 and resistance R1 is smaller,
I/O port interruption can not be triggered, it is therefore desirable to signal amplification be realized using signal amplification module, so as to recognize rising by I/O port
Edge simultaneously carries out step-by-step counting.
Temperature sensor U1, that is, chip is the temperature sensor chip of a high-precision encapsulation, have one it is easy to use
Step-by-step counting interface.When first interface and second interface both ends add 2 to 5.5V voltage, by periodic output current arteries and veins
Signal is rushed, pulse number is related to collected temperature, and pulse signal can convert according to the reduction formula of pulse number and temperature
Into temperature.Performance is excellent in terms of TO-92 is encapsulated in acquisition combustion gas, since the H2S gases in combustion gas can corrode metal device, patch
The perishable part such as device bonding pad needs gluing to prevent from failing, high to technological requirement, and TO-92 can be by two by Shooting Technique
A pin does insulation processing, and chip package can be directly exposed in combustion gas and will not be corroded, realize to the direct of fuel gas temperature
Sampling.Since temperature sensor output is current signal, AD sample objects are voltage signal, therefore defeated in temperature sensor signal
One resistance R2 of outlet second interface series connection realizes the conversion of signal, and current impulse is converted to voltage pulse.
The Essential Action of triode Q1 switching circuits amplifies for signal, and shape is turned off by triode of the control in saturated mode
State carrys out the level height of control signal output.When second interface end output level is high, CE the two poles of the earth conducting of triode Q1,
The electric current for flowing through R1 is minimum, and signal output end is low level；When second interface end output level is low, the CE two of triode Q1
Pole is ended, and signal output end is high level, i.e. the output waveform reverse phase of the waveform of signal output end output and sensor.Due to collection
Electrode is connected to power input by resistance R3, so the signal amplitude and MCU Main Processing Unit after signal amplification module
Electrical level match, there is no the risks of damage MCU Main Processing Unit I/O port.
Resistance R2 is added between the second interface end of temperature sensor and triode Q1 base stages further to reduce temperature
The power consumption of Acquisition Circuit, due to triode BE both ends, there are junction capacity, and the conducting speed of triode can be improved by reducing base current
It spends, wave distortion at signal output end.
The above makes the preferred embodiment of the utility model, does not depart from for those of ordinary skill in the art
Under the premise of the utility model principle, several variations and modifications can also be made, these also should be regarded as the protection of the utility model
Range.
Claims (7)
1. a kind of temperature sensing circuit in gas meter, flow meter table of MCU power supplies, it is characterised in that：It is adopted including MCU Main Processing Unit and temperature
Collector, the temperature collection circuit are used to acquire the temperature of combustion gas in residing gas meter, flow meter and send out pulse to MCU Main Processing Unit
Signal, the MCU Main Processing Unit are handled to obtain the temperature value of combustion gas in gas meter, flow meter to the pulse signal received；
The temperature collection circuit includes power input and signal output end, and the power input couples MCU Main Processing Unit,
It is the electric energy that temperature collection circuit provides for transmitting MCU Main Processing Unit；The signal output end couples MCU Main Processing Unit, uses
In sending the pulse signal that temperature collection circuit is sent out to MCU Main Processing Unit；
The temperature collection circuit further includes temperature sensor, switching tube and first resistor, and the temperature sensor includes the
One interface and second interface, the first interface couple power input, and second interface is grounded by first resistor；The switch
Pipe base stage couples the second interface of temperature sensor, switch pipe collector coupling signal output end, and the switching tube emitter connects
Ground.
2. temperature sensing circuit in the gas meter, flow meter table of MCU power supplies according to claim 1, it is characterised in that：Further include one
A power supply, the supply coupling MCU Main Processing Unit, for individually powering to MCU Main Processing Unit.
3. temperature sensing circuit in the gas meter, flow meter table of MCU power supplies according to claim 1, it is characterised in that：The switch
Pipe base stage couples the second interface of temperature sensor by second resistance.
4. temperature sensing circuit in the gas meter, flow meter table of MCU power supplies according to claim 1, it is characterised in that：The switch
Pipe collector couples power input by 3rd resistor.
5. temperature sensing circuit in the gas meter, flow meter table of MCU power supplies according to claim 1, it is characterised in that：The MCU master
It controls unit to couple by the first I/O port and the power input, MCU Main Processing Unit is defeated by the second I/O port coupling signal
Outlet.
6. temperature sensing circuit in the gas meter, flow meter table of MCU power supplies according to claim 5, it is characterised in that：Described first
The output current value of I/O port is higher than 1mA.
7. temperature sensing circuit in the gas meter, flow meter table of MCU power supplies according to claim 1, it is characterised in that：The switch
It manages as NPN type triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721631655.4U CN207600537U (en) | 2017-11-29 | 2017-11-29 | Temperature sensing circuit in a kind of gas meter, flow meter table of MCU power supplies |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721631655.4U CN207600537U (en) | 2017-11-29 | 2017-11-29 | Temperature sensing circuit in a kind of gas meter, flow meter table of MCU power supplies |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207600537U true CN207600537U (en) | 2018-07-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721631655.4U Active CN207600537U (en) | 2017-11-29 | 2017-11-29 | Temperature sensing circuit in a kind of gas meter, flow meter table of MCU power supplies |
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| CN (1) | CN207600537U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109443468A (en) * | 2018-12-18 | 2019-03-08 | 成都前锋电子仪器有限责任公司 | A kind of gas meter controller of compatible various flow rate meter output interface |
-
2017
- 2017-11-29 CN CN201721631655.4U patent/CN207600537U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109443468A (en) * | 2018-12-18 | 2019-03-08 | 成都前锋电子仪器有限责任公司 | A kind of gas meter controller of compatible various flow rate meter output interface |
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