CN204514498U - A kind of temperature sensing circuit for gas meter, flow meter - Google Patents
A kind of temperature sensing circuit for gas meter, flow meter Download PDFInfo
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- CN204514498U CN204514498U CN201520236710.4U CN201520236710U CN204514498U CN 204514498 U CN204514498 U CN 204514498U CN 201520236710 U CN201520236710 U CN 201520236710U CN 204514498 U CN204514498 U CN 204514498U
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Abstract
The utility model relates to gas metering field, particularly a kind of temperature sensing circuit for gas meter, flow meter.Comprise power control circuit, sample circuit and analog to digital conversion circuit, described power control circuit is connected with sample circuit and analog to digital conversion circuit, for controlling the power supply of described sample circuit and analog to digital conversion circuit simultaneously; Described sample circuit is for gathering ambient temperature data; Data are sent to gas meter controller after being used for that the data collected are carried out analog to digital conversion by institute's analog to digital conversion circuit; The temperature sensing circuit for gas meter, flow meter that the utility model provides is provided with power control circuit, can the on/off of control temperature testing circuit as required, thus is ensureing, under the prerequisite that necessary temp gathers, to save system power supply to greatest extent.
Description
Technical field
The utility model relates to gas metering field, particularly a kind of temperature sensing circuit for gas meter, flow meter.
Background technology
The measuring accuracy of gas meter, flow meter can be subject to the various factors such as temperature and gaseous-pressure, therefore be provided with temperature sensing circuit in gas meter, flow meter more, but the temperature sensing circuit of existing gas meter, flow meter mostly is continued power and detects, for gas meter, flow meter, especially adopt battery as the gas meter, flow meter of power supply, this causes the waste of power supply undoubtedly, is unfavorable for the work of gas meter, flow meter, and the accuracy of detection of simultaneous temperature testing circuit also has vital effect to measurement result.
Utility model content
The problem that goal of the invention of the present utility model is to solve existing gas meter, flow meter temperature sensing circuit continued power provides a kind of temperature sensing circuit for gas meter, flow meter of controllable switch, comprise power control circuit, sample circuit and analog to digital conversion circuit, described power control circuit is connected with sample circuit and analog to digital conversion circuit, for controlling the power supply of described sample circuit and analog to digital conversion circuit simultaneously; Described sample circuit is for gathering ambient temperature data; Data are sent to gas meter controller after being used for that the data collected are carried out analog to digital conversion by institute's analog to digital conversion circuit.
Further, described power control circuit comprises the first metal-oxide-semiconductor and the first resistance that are arranged in parallel; One end of the first metal-oxide-semiconductor be arranged in parallel and the first resistance connects power supply, and the other end is the output terminal of power control circuit; The control end of described first metal-oxide-semiconductor is connected with the collector of the first triode, one end of the second resistance simultaneously, the other end of the second resistance is connected with power supply, the emitter grounding of the first triode, the base stage of the first triode is for receiving the control signal from gas meter controller simultaneously.
Further, described sample circuit comprises the thermistor and current measurement resistance that are serially connected.
Further, analog-digital conversion circuit as described comprises ADC chip, the second metal-oxide-semiconductor, the 3rd metal-oxide-semiconductor, the 4th metal-oxide-semiconductor, the 5th metal-oxide-semiconductor, the first input end mouth of described ADC chip is connected with the two ends of described thermistor respectively by the second metal-oxide-semiconductor, the 3rd metal-oxide-semiconductor, and the second input port of described ADC chip is connected with the two ends of described current measurement resistance respectively by the 4th metal-oxide-semiconductor, the 5th metal-oxide-semiconductor; The control end of described second metal-oxide-semiconductor, the 3rd metal-oxide-semiconductor, the 4th metal-oxide-semiconductor, the 5th metal-oxide-semiconductor is connected with gas meter controller respectively, and it is for reception control signal; The output port of described ADC chip is connected with gas meter controller.
Preferably, described thermistor is MFD resistance.
In sum, owing to have employed technique scheme, the beneficial effects of the utility model are:
The temperature sensing circuit for gas meter, flow meter that the utility model provides is provided with power control circuit, can the on/off of control temperature testing circuit as required, thus ensureing under the prerequisite that necessary temp gathers, save system power supply to greatest extent, and circuit of the present utility model have employed the higher Sampling device of sensitivity and modulus switching device, improves sampling precision.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Fig. 2 is circuit diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in detail.
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
The problem that goal of the invention of the present utility model is to solve existing gas meter, flow meter temperature sensing circuit continued power provides a kind of temperature sensing circuit for gas meter, flow meter of controllable switch, comprise power control circuit 1, sample circuit 2 and analog to digital conversion circuit 3, described power control circuit 1 is connected with sample circuit 2 and analog to digital conversion circuit 3, for controlling the power supply of described sample circuit 2 and analog to digital conversion circuit 3 simultaneously; Described sample circuit 2 is for gathering ambient temperature data; Data are sent to gas meter controller by institute's analog to digital conversion circuit 3 after the data collected are carried out analog to digital conversion.
Further, described power control circuit comprises the first metal-oxide-semiconductor Q1 and the first resistance R1 that are arranged in parallel; One end of the first metal-oxide-semiconductor Q1 be arranged in parallel and the first resistance R1 connects power vd DA, and the other end is the output terminal VADS of power control circuit 1; The control end of described first metal-oxide-semiconductor Q1 is connected with the collector of the first triode Q6, one end of the second resistance R2 simultaneously, the other end of the second resistance R2 is connected with power vd DA, the emitter grounding of the first triode Q6, the base stage of the first triode Q6 is for receiving the control signal AD_POW_CON1 from gas meter controller simultaneously.
Further, described sample circuit comprises the thermistor be serially connected and (is only shown as general-purpose interface J1 in Fig. 2, in practical application, thermistor is by this general-purpose interface place in circuit) and current measurement resistance R3, the two ends of general-purpose interface J1 are provided with voltage acquisition port, and output signal Vpt+, Vpt-respectively; Current measurement resistance R3 one end is connected with general-purpose interface J1 simultaneously, and the other end is provided with voltage acquisition port and outputs signal VRl-.
Further, analog-digital conversion circuit as described 3 comprises ADC chip (the actual ADS1100 of employing and peripheral circuit thereof realize), the first input end mouth Vin+ of described ADC chip is connected with the voltage acquisition port at the two ends of described thermistor respectively by the second metal-oxide-semiconductor Q2, the 3rd metal-oxide-semiconductor Q3, and the second input port Vin-of described ADC chip gathers port respectively by the 4th metal-oxide-semiconductor Q4, the 5th metal-oxide-semiconductor Q5 with the power supply at the two ends of described current measurement resistance and is connected, described second metal-oxide-semiconductor Q2, 3rd metal-oxide-semiconductor Q3, 4th metal-oxide-semiconductor Q4, the control end of the 5th metal-oxide-semiconductor Q5 is connected with gas meter controller respectively, it is for reception control signal AIN+_CNT1, AIN+_CNT2, AIN-_CNT1, AIN-_CNT2, in the present embodiment, ADC chip adopts ADS1100, therefore its output port is the I2C interface of standard, (the SDA port in Fig. 2 and SCL port, wherein SDA port transmission serial data, SCL port transmission tandem clock frequency) gas meter controller connection, it will be for collecting described thermistor, the digital signal that the magnitude of voltage at current measurement resistance R3 two ends transforms exports gas meter controller to, what be pointed out that the utility model provides is only temperature sensing circuit, the magnitude of voltage at the thermistor collected and current measurement resistance two ends is only transferred to gas meter controller by analog to digital conversion circuit 3, and temperature value is calculated by gas meter controller, computing method are the R3 resistance according to storing in advance, the R3 both end voltage recorded calculates thermistor real-time current, and the real-time resistance of thermistor is calculated according to the thermistor both end voltage recorded, again further according to the PT1000 phasing meter stored in gas meter controller, linear difference algorithm is utilized to calculate.
Preferably, described thermistor is MFD resistance.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection domain of the present utility model.
Claims (5)
1. the temperature sensing circuit for gas meter, flow meter, it is characterized in that, comprise power control circuit, sample circuit and analog to digital conversion circuit, described power control circuit is connected with sample circuit and analog to digital conversion circuit, for controlling the power supply of described sample circuit and analog to digital conversion circuit simultaneously; Described sample circuit is for gathering ambient temperature data; Data are sent to gas meter controller after being used for that the data collected are carried out analog to digital conversion by institute's analog to digital conversion circuit.
2. the temperature sensing circuit for gas meter, flow meter according to claim 1, is characterized in that, described power control circuit comprises the first metal-oxide-semiconductor and the first resistance that are arranged in parallel; One end of the first metal-oxide-semiconductor be arranged in parallel and the first resistance connects power supply, and the other end is the output terminal of power control circuit; The control end of described first metal-oxide-semiconductor is connected with the collector of the first triode, one end of the second resistance simultaneously, the other end of the second resistance is connected with power supply, the emitter grounding of the first triode, the base stage of the first triode is for receiving the control signal from gas meter controller simultaneously.
3. the temperature sensing circuit for gas meter, flow meter according to claim 1, is characterized in that, described sample circuit comprises the thermistor and current measurement resistance that are serially connected.
4. the temperature sensing circuit for gas meter, flow meter according to claim 3, it is characterized in that, analog-digital conversion circuit as described comprises ADC chip, the second metal-oxide-semiconductor, the 3rd metal-oxide-semiconductor, the 4th metal-oxide-semiconductor, the 5th metal-oxide-semiconductor, the first input end mouth of described ADC chip is connected with the two ends of described thermistor respectively by the second metal-oxide-semiconductor, the 3rd metal-oxide-semiconductor, and the second input port of described ADC chip is connected with the two ends of described current measurement resistance respectively by the 4th metal-oxide-semiconductor, the 5th metal-oxide-semiconductor; The control end of described second metal-oxide-semiconductor, the 3rd metal-oxide-semiconductor, the 4th metal-oxide-semiconductor, the 5th metal-oxide-semiconductor is connected with gas meter controller respectively, and it is for reception control signal; The output port of described ADC chip is connected with gas meter controller.
5. the temperature sensing circuit for gas meter, flow meter according to claim 3 or 4, is characterized in that, described thermistor is MFD resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520236710.4U CN204514498U (en) | 2015-04-20 | 2015-04-20 | A kind of temperature sensing circuit for gas meter, flow meter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520236710.4U CN204514498U (en) | 2015-04-20 | 2015-04-20 | A kind of temperature sensing circuit for gas meter, flow meter |
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| Publication Number | Publication Date |
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| CN204514498U true CN204514498U (en) | 2015-07-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520236710.4U Active CN204514498U (en) | 2015-04-20 | 2015-04-20 | A kind of temperature sensing circuit for gas meter, flow meter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104776932A (en) * | 2015-04-20 | 2015-07-15 | 成都千嘉科技有限公司 | Temperature detection system applied to gas meter |
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2015
- 2015-04-20 CN CN201520236710.4U patent/CN204514498U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104776932A (en) * | 2015-04-20 | 2015-07-15 | 成都千嘉科技有限公司 | Temperature detection system applied to gas meter |
| CN104776932B (en) * | 2015-04-20 | 2017-12-08 | 成都千嘉科技有限公司 | System for detecting temperature for gas meter, flow meter |
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Address after: No. 536, Section 1, airport 1st Road, Shuangliu Southwest Airport, Chengdu, Sichuan 610211 Patentee after: Chengdu Qianjia Technology Co.,Ltd. Address before: No. 536, Section 1, airport 1st Road, Shuangliu Southwest Airport, Chengdu, Sichuan 610211 Patentee before: Chengdu Qianjia Technology Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |