技术领域technical field
本实用新型涉及燃气计量领域，特别是一种用于燃气表的温度检测电路。The utility model relates to the field of gas metering, in particular to a temperature detection circuit for a gas meter.
背景技术Background technique
燃气表的计量精度会受到温度和燃气压力等多种因素影响，因此燃气表中多设有温度检测电路，但是现有燃气表的温度检测电路多为持续供电检测，对于燃气表来说，尤其是采用电池作为电源的燃气表来说，这无疑造成电源的浪费，不利于燃气表的工作，同时温度检测电路的检测精度也对测量结果有着至关重要的作用。The measurement accuracy of gas meters will be affected by various factors such as temperature and gas pressure. Therefore, most gas meters are equipped with temperature detection circuits. However, the temperature detection circuits of existing gas meters are mostly continuous power supply detection. For gas meters, especially For a gas meter that uses a battery as a power source, this will undoubtedly cause a waste of power, which is not conducive to the work of the gas meter. At the same time, the detection accuracy of the temperature detection circuit also plays a vital role in the measurement results.
实用新型内容Utility model content
本实用新型的发明目的在于解决现有燃气表温度检测电路持续供电的问题提供一种可控制开关的用于燃气表的温度检测电路，包括电源控制电路、采样电路和模数转换电路，所述电源控制电路同时与采样电路及模数转换电路连接，用于控制所述采样电路及模数转换电路的电源；所述采样电路用于采集环境温度数据；所模数转换电路用于将采集到的数据进行模数转换后将数据传送至燃气表控制器。The purpose of the invention of the utility model is to solve the problem of continuous power supply of the existing gas meter temperature detection circuit, and provide a switchable temperature detection circuit for the gas meter, including a power control circuit, a sampling circuit and an analog-to-digital conversion circuit. The power control circuit is connected with the sampling circuit and the analog-to-digital conversion circuit at the same time, and is used to control the power supply of the sampling circuit and the analog-to-digital conversion circuit; the sampling circuit is used to collect ambient temperature data; the analog-to-digital conversion circuit is used to collect the collected After analog-to-digital conversion of the data, the data is sent to the gas meter controller.
进一步的，所述电源控制电路包括并联设置的第一MOS管和第一电阻；并联设置的第一MOS管及第一电阻的一端连接电源，另一端为电源控制电路的输出端；所述第一MOS管的控制端同时与第一三极管的集极、第二电阻的一端连接，第二电阻的另一端与电源连接，第一三极管的射极接地，同时第一三极管的基极用于接收来自燃气表控制器的控制信号。Further, the power control circuit includes a first MOS transistor and a first resistor arranged in parallel; one end of the first MOS transistor and the first resistor arranged in parallel is connected to the power supply, and the other end is the output end of the power control circuit; the first The control terminal of a MOS tube is connected to the collector of the first triode and one end of the second resistor at the same time, the other end of the second resistor is connected to the power supply, the emitter of the first triode is grounded, and the first triode The base is used to receive the control signal from the gas meter controller.
进一步的，所述采样电路包括串接在一起的热敏电阻及电流测量电阻。Further, the sampling circuit includes a thermistor and a current measuring resistor connected in series.
进一步的，所述模数转换电路包括ADC芯片、第二MOS管、第三MOS管、第四MOS管、第五MOS管，所述ADC芯片的第一输入端口分别通过第二MOS管、第三MOS管与所述热敏电阻的两端连接，所述ADC芯片的第二输入端口分别通过第四MOS管、第五MOS管与所述电流测量电阻的两端连接；所述第二MOS管、第三MOS管、第四MOS管、第五MOS管的控制端分别与燃气表控制器连接，其用于接收控制信号；所述ADC芯片的输出端口与燃气表控制器连接。Further, the analog-to-digital conversion circuit includes an ADC chip, a second MOS transistor, a third MOS transistor, a fourth MOS transistor, and a fifth MOS transistor, and the first input port of the ADC chip passes through the second MOS transistor, the fifth MOS transistor, and Three MOS transistors are connected to the two ends of the thermistor, and the second input port of the ADC chip is respectively connected to the two ends of the current measuring resistor through the fourth MOS transistor and the fifth MOS transistor; the second MOS The control ends of the tube, the third MOS tube, the fourth MOS tube, and the fifth MOS tube are respectively connected to the gas meter controller for receiving control signals; the output port of the ADC chip is connected to the gas meter controller.
优选的，所述热敏电阻为MFD电阻。Preferably, the thermistor is an MFD resistor.
综上所述，由于采用了上述技术方案，本实用新型的有益效果是：In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:
本实用新型提供的用于燃气表的温度检测电路设置有电源控制电路，可根据需要控制温度检测电路的电源通断，从而在保证必要温度采集的前提下，最大限度的节省系统电源，且本实用新型的电路采用了灵敏度更高的采样器件及模数转换器件，提高了采样精度。The temperature detection circuit used in the gas meter provided by the utility model is provided with a power control circuit, which can control the power supply of the temperature detection circuit on and off according to the needs, so as to save the system power to the greatest extent under the premise of ensuring the necessary temperature collection, and the present invention The circuit of the utility model adopts a sampling device and an analog-to-digital conversion device with higher sensitivity, thereby improving the sampling precision.
附图说明Description of drawings
图1是本实用新型的结构示意图。Fig. 1 is the structural representation of the utility model.
图2为本实用新型的电路图。Fig. 2 is the circuit diagram of the utility model.
具体实施方式Detailed ways
下面结合附图，对本实用新型作详细的说明。Below in conjunction with accompanying drawing, the utility model is described in detail.
为了使本实用新型的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本实用新型进行进一步详细说明。应当理解，此处所描述的具体实施例仅用以解释本实用新型，并不用于限定本实用新型。In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.
本实用新型的发明目的在于解决现有燃气表温度检测电路持续供电的问题提供一种可控制开关的用于燃气表的温度检测电路，包括电源控制电路1、采样电路2和模数转换电路3，所述电源控制电路1同时与采样电路2及模数转换电路3连接，用于控制所述采样电路2及模数转换电路3的电源；所述采样电路2用于采集环境温度数据；所模数转换电路3用于将采集到的数据进行模数转换后将数据传送至燃气表控制器。The purpose of the invention of the utility model is to solve the problem of continuous power supply of the existing gas meter temperature detection circuit and provide a switchable temperature detection circuit for gas meters, including a power control circuit 1, a sampling circuit 2 and an analog-to-digital conversion circuit 3 , the power control circuit 1 is connected with the sampling circuit 2 and the analog-to-digital conversion circuit 3 at the same time, and is used to control the power supply of the sampling circuit 2 and the analog-to-digital conversion circuit 3; the sampling circuit 2 is used to collect ambient temperature data; The analog-to-digital conversion circuit 3 is used to perform analog-to-digital conversion on the collected data and transmit the data to the gas meter controller.
进一步的，所述电源控制电路包括并联设置的第一MOS管Q1和第一电阻R1；并联设置的第一MOS管Q1及第一电阻R1的一端连接电源VDDA，另一端为电源控制电路1的输出端VADS；所述第一MOS管Q1的控制端同时与第一三极管Q6的集极、第二电阻R2的一端连接，第二电阻R2的另一端与电源VDDA连接，第一三极管Q6的射极接地，同时第一三极管Q6的基极用于接收来自燃气表控制器的控制信号AD_POW_CON1。Further, the power supply control circuit includes a first MOS transistor Q1 and a first resistor R1 arranged in parallel; one end of the first MOS transistor Q1 and the first resistor R1 arranged in parallel is connected to the power supply VDDA, and the other end is connected to the power supply control circuit 1. Output terminal VADS; the control terminal of the first MOS transistor Q1 is simultaneously connected to the collector of the first triode Q6 and one end of the second resistor R2, and the other end of the second resistor R2 is connected to the power supply VDDA, and the first triode The emitter of the tube Q6 is grounded, and the base of the first triode Q6 is used to receive the control signal AD_POW_CON1 from the gas meter controller.
进一步的，所述采样电路包括串接在一起的热敏电阻(图2中仅显示为通用接口J1，实际应用中热敏电阻为通过该通用接口接入电路)及电流测量电阻R3,通用接口J1的两端设置有电压采集端口，并分别输出信号Vpt+、Vpt-；同时电流测量电阻R3一端与通用接口J1连接，另一端设置有电压采集端口并输出信号VRl-。Further, the sampling circuit includes a thermistor connected in series (only shown as a general interface J1 in FIG. Both ends of J1 are provided with voltage acquisition ports, and output signals Vpt+ and Vpt- respectively; at the same time, one end of the current measuring resistor R3 is connected to the general interface J1, and the other end is provided with a voltage acquisition port and outputs signal VRl-.
进一步的，所述模数转换电路3包括ADC芯片（实际采用ADS1100及其周边电路实现），所述ADC芯片的第一输入端口Vin+分别通过第二MOS管Q2、第三MOS管Q3与所述热敏电阻的两端的电压采集端口连接，所述ADC芯片的第二输入端口Vin-分别通过第四MOS管Q4、第五MOS管Q5与所述电流测量电阻的两端的电源采集端口连接；所述第二MOS管Q2、第三MOS管Q3、第四MOS管Q4、第五MOS管Q5的控制端分别与燃气表控制器连接，其用于接收控制信号AIN+_CNT1、AIN+_CNT2、AIN-_CNT1、AIN-_CNT2， 本实施例中ADC芯片采用ADS1100,因此其输出端口为标准的I2C接口，（图2中的SDA端口及SCL端口，其中SDA端口传输串列数据，SCL端口传输串列时钟频率）燃气表控制器连接，其用于将采集到所述热敏电阻、电流测量电阻R3两端的电压值转化的数字信号输出至燃气表控制器，需指出的是本实用新型提供的仅为温度检测电路，模数转换电路3仅将采集到的热敏电阻及电流测量电阻两端的电压值传输至燃气表控制器，而温度值是由燃气表控制器计算，计算方法为根据预先储存的R3阻值、测得的R3两端电压计算热敏电阻实时电流，并根据测得的热敏电阻两端电压计算热敏电阻的实时阻值，再进一步根据燃气表控制器中储存的PT1000分度表，利用线性差值算法计算得出。Further, the analog-to-digital conversion circuit 3 includes an ADC chip (actually realized by ADS1100 and its peripheral circuits), and the first input port Vin+ of the ADC chip communicates with the second MOS transistor Q2, the third MOS transistor Q3 and the The voltage acquisition ports at both ends of the thermistor are connected, and the second input port Vin- of the ADC chip is connected to the power acquisition ports at both ends of the current measuring resistor through the fourth MOS transistor Q4 and the fifth MOS transistor Q5 respectively; The control terminals of the second MOS tube Q2, the third MOS tube Q3, the fourth MOS tube Q4, and the fifth MOS tube Q5 are respectively connected to the gas meter controller, which are used to receive the control signals AIN+_CNT1, AIN+_CNT2, AIN -_CNT1, AIN-_CNT2, in the present embodiment, the ADC chip adopts ADS1100, so its output port is a standard I2C interface, (SDA port and SCL port in Figure 2, wherein the SDA port transmits serial data, and the SCL port transmits serial data Clock frequency) connected to the gas meter controller, which is used to output the digital signal converted from the voltage value collected at both ends of the thermistor and current measuring resistor R3 to the gas meter controller. It should be pointed out that the utility model provides only It is a temperature detection circuit, and the analog-to-digital conversion circuit 3 only transmits the collected voltage values at both ends of the thermistor and the current measuring resistance to the gas meter controller, and the temperature value is calculated by the gas meter controller, and the calculation method is based on pre-stored Calculate the real-time current of the thermistor based on the resistance value of R3 and the measured voltage across R3, and calculate the real-time resistance value of the thermistor according to the measured voltage across the thermistor, and further calculate the real-time resistance value of the thermistor according to the PT1000 stored in the gas meter controller. Index table, calculated using linear difference algorithm.
优选的，所述热敏电阻为MFD电阻。Preferably, the thermistor is an MFD resistor.
以上所述仅为本实用新型的较佳实施例而已，并不用以限制本实用新型，凡在本实用新型的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本实用新型的保护范围之内。The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520236710.4UCN204514498U (en) | 2015-04-20 | 2015-04-20 | A kind of temperature sensing circuit for gas meter, flow meter |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520236710.4UCN204514498U (en) | 2015-04-20 | 2015-04-20 | A kind of temperature sensing circuit for gas meter, flow meter |
| Publication Number | Publication Date |
|---|---|
| CN204514498Utrue CN204514498U (en) | 2015-07-29 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520236710.4UExpired - LifetimeCN204514498U (en) | 2015-04-20 | 2015-04-20 | A kind of temperature sensing circuit for gas meter, flow meter |
| Country | Link |
|---|---|
| CN (1) | CN204514498U (en) |
| 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 |
| 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 |
| Publication | Publication Date | Title |
|---|---|---|
| CN207703359U (en) | A kind of acquisition of multichannel thermistor temp and processing unit | |
| CN204855009U (en) | Temperature detection circuit based on platinum thermal resistance | |
| CN107255529A (en) | A kind of temperature sensors of high precision | |
| CN205665316U (en) | Novel resistance automatic measure device | |
| CN105277292A (en) | Temperature measurement device | |
| CN202109934U (en) | A high-precision temperature and humidity transmitter with wireless communication function | |
| CN110456144A (en) | A nA level current measurement system for testing equipment | |
| CN203101474U (en) | Electrification detector for high-voltage electric system | |
| CN204514498U (en) | A kind of temperature sensing circuit for gas meter, flow meter | |
| CN204373797U (en) | A kind of silicon diode temperature metering circuit | |
| CN203100945U (en) | Non-linear correction device for intelligent pressure sensor | |
| CN205898902U (en) | A tiny resistance measuring device | |
| CN204154886U (en) | Based on voltage, the electric current precision metering device of satellite navigation system | |
| CN207280617U (en) | High precision temperature acquisition device based on PT100 | |
| CN102980677B (en) | Method and device for measuring temperature of large-scale objects based on quartz temperature sensor | |
| CN205427047U (en) | Little resistance meter of intelligence | |
| CN205642725U (en) | Resistance vacuum transmitter | |
| CN204228286U (en) | A kind of Moisture Meter temperature collection circuit | |
| CN204228936U (en) | A kind of field signal detection system | |
| CN206339258U (en) | Laboratory safety-protection system based on Zigbee | |
| CN104316890B (en) | Voltage, electric current precision metering device and delicate metering method based on satellite navigation system | |
| CN203564226U (en) | Novel blood pressure sensor | |
| CN206038177U (en) | Three -way formula platinum resistance PT100 temperature measuring system | |
| CN104776932B (en) | System for detecting temperature for gas meter, flow meter | |
| CN204461641U (en) | A kind of power station temperature measuring circuit |
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder | 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. | |
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term | Granted publication date:20150729 |