技术领域technical field
本实用新型涉及一种温度检测系统，特别涉及一种多路温度检测系统。The utility model relates to a temperature detection system, in particular to a multi-channel temperature detection system.
背景技术Background technique
利用温度传感器进行检测指定地点温度，属于各个领域较为常见的方式；温度传感器种类较多，应用场合也各不相同；温度传感器采集到的温度信号需要经过温度补偿、转换、放大后传至数据处理或者储存设备。因此，现有的温度检测系统结构较为复杂，成本也较高；特别是对于需要检测多点温度的系统，结构更是较为复杂，不但成本较高，制造工艺以及温度参数的获取精度也不搞。Using a temperature sensor to detect the temperature of a designated location is a relatively common method in various fields; there are many types of temperature sensors, and the application occasions are also different; the temperature signal collected by the temperature sensor needs to be temperature compensated, converted, and amplified before being sent to data processing or storage devices. Therefore, the structure of the existing temperature detection system is relatively complicated, and the cost is also high; especially for the system that needs to detect multi-point temperature, the structure is more complicated, not only the cost is high, but the manufacturing process and the acquisition accuracy of temperature parameters are not good. .
因此，需要一种多路温度检测系统，实现多路温度检测，结构较为简化，减小仪器体积，降低制造以及使用成本，各个检测点具有相同的补偿精度，从而达到较为准确的检测结果。Therefore, a multi-channel temperature detection system is needed to realize multi-channel temperature detection, the structure is relatively simplified, the volume of the instrument is reduced, and the cost of manufacturing and use is reduced. Each detection point has the same compensation accuracy, so as to achieve more accurate detection results.
实用新型内容Utility model content
有鉴于此，本实用新型提供一种多路温度检测系统，实现多路温度检测，结构较为简化，减小仪器体积，降低制造以及使用成本，各个检测点具有相同的补偿精度，从而达到较为准确的检测结果。In view of this, the utility model provides a multi-channel temperature detection system to realize multi-channel temperature detection, the structure is relatively simplified, the volume of the instrument is reduced, and the cost of manufacturing and use is reduced. test results.
本实用新型的多路温度检测系统，包括:The multi-channel temperature detection system of the present utility model comprises:
温度检测单元，为对应分布于多个温度检测点的多个温度传感器用于检测并获得被测点的温度参数；The temperature detection unit is used to detect and obtain the temperature parameters of the measured points for multiple temperature sensors corresponding to the multiple temperature detection points;
一个温度补偿单元，用于接收温度检测单元的温度参数并进行温度补偿；A temperature compensation unit for receiving temperature parameters from the temperature detection unit and performing temperature compensation;
信号通道选通单元，对多个温度传感器的信号输出择一选择导通至温度补偿单元；The signal channel gating unit selects one of the signal outputs of multiple temperature sensors to be turned on to the temperature compensation unit;
中央控制单元，用于接收温度补偿单元传来的温度参数并向信号传输单元发出选择导通命令。The central control unit is used to receive the temperature parameter from the temperature compensation unit and send a selective conduction command to the signal transmission unit.
进一步，所述信号通道选通单元包括：Further, the signal channel gating unit includes:
开关单元，为多个开关对应连接于多个温度传感器与温度补偿单元之间，用于启闭温度参数传输通道；The switch unit is a plurality of switches correspondingly connected between a plurality of temperature sensors and the temperature compensation unit, and is used to open and close the temperature parameter transmission channel;
通道控制单元，用于接收中央控制单元的命令并向开关单元发出对多个开关的择一导通命令；The channel control unit is used to receive the command from the central control unit and issue a conduction command to the switch unit for a plurality of switches;
进一步，多路温度检测系统还包括：Further, the multi-channel temperature detection system also includes:
通信单元，将中央控制单元所接收的数据参数传到上位机；The communication unit transmits the data parameters received by the central control unit to the upper computer;
进一步，所述温度传感器为K型热电偶；温度补偿单元为对K型热电偶冷端温度补偿的芯片MAX6675；Further, the temperature sensor is a K-type thermocouple; the temperature compensation unit is a chip MAX6675 for temperature compensation of the cold junction of the K-type thermocouple;
进一步，所述开关为光耦继电器；通道控制单元为用于对多个光耦继电器择一选择导通的译码器；Further, the switch is an optocoupler relay; the channel control unit is a decoder for selectively conducting a plurality of optocoupler relays;
进一步，所述中央控制单元输出连接设有显示单元；Further, the output connection of the central control unit is provided with a display unit;
进一步，所述通信单元为PL2303串口通信芯片，所述上位机为PC机；光耦继电器为ac30s[okita]，所述译码器为74HC154；中央控制单元信号连接有时钟芯片DS1302；Further, the communication unit is a PL2303 serial communication chip, the upper computer is a PC; the optocoupler relay is ac30s[okita], and the decoder is 74HC154; the central control unit signal is connected with a clock chip DS1302;
进一步，多路温度检测系统为八路温度检测系统，所述温度检测点以及对应的温度传感器均为八个。Further, the multi-channel temperature detection system is an eight-channel temperature detection system, and there are eight temperature detection points and corresponding temperature sensors.
本实用新型的有益效果：本实用新型的多路温度检测系统，利用信号通道选通单元使得多个温度传感器共用一个温度补偿单元的结构，实现多路温度检测，结构较为简化，减小仪器体积，降低制造以及使用成本，各个检测点具有相同的补偿精度，从而达到较为准确的检测结果。Beneficial effects of the utility model: the multi-channel temperature detection system of the present utility model uses the signal channel gating unit to make multiple temperature sensors share the structure of a temperature compensation unit to realize multi-channel temperature detection, the structure is relatively simplified, and the volume of the instrument is reduced , to reduce manufacturing and use costs, each detection point has the same compensation accuracy, so as to achieve more accurate detection results.
附图说明Description of drawings
下面结合附图和实施例对本实用新型作进一步描述。Below in conjunction with accompanying drawing and embodiment the utility model is described further.
图1为本实用新型系统原理图；Fig. 1 is a schematic diagram of the utility model system;
图2为信号通道选通单元电路图。FIG. 2 is a circuit diagram of a signal channel gating unit.
具体实施方式Detailed ways
图1为本实用新型系统原理图，图2为信号通道选通单元电路图；本实施例的多路温度检测系统，包括:Fig. 1 is a schematic diagram of the utility model system, and Fig. 2 is a signal channel gating unit circuit diagram; the multi-channel temperature detection system of the present embodiment includes:
温度检测单元，为对应分布于多个温度检测点的多个温度传感器用于检测并获得被测点的温度参数；The temperature detection unit is used to detect and obtain the temperature parameters of the measured points for multiple temperature sensors corresponding to the multiple temperature detection points;
一个温度补偿单元，用于接收温度检测单元的温度参数并进行温度补偿；A temperature compensation unit for receiving temperature parameters from the temperature detection unit and performing temperature compensation;
信号通道选通单元，对多个温度传感器的信号输出择一选择导通至温度补偿单元；The signal channel gating unit selects one of the signal outputs of multiple temperature sensors to be turned on to the temperature compensation unit;
中央控制单元，用于接收温度补偿单元传来的温度参数并向信号传输单元发出选择导通命令；The central control unit is used to receive the temperature parameters from the temperature compensation unit and send a selection conduction command to the signal transmission unit;
当然，还可以外接输入输出单元用于输入命令并输出音频和视频信号，比如键盘、触摸屏、显示器等等，在此不再赘述；温度补偿单元可根据选用的不同的温度传感器可采用不同的不同的类型，在此不再赘述；中央控制单元可为一简单的单片机，也可以是pc机，根据需要进行选择，一般采用单片机。Of course, external input and output units can also be used to input commands and output audio and video signals, such as keyboards, touch screens, displays, etc., which will not be repeated here; the temperature compensation unit can be used according to different temperature sensors. Types, which will not be repeated here; the central control unit can be a simple single-chip microcomputer, or a pc machine, which can be selected according to needs, and a single-chip microcomputer is generally used.
本实施例中，所述信号通道选通单元包括：In this embodiment, the signal channel gating unit includes:
开关单元，为多个开关对应连接于多个温度传感器与温度补偿单元之间，用于启闭温度参数传输通道；开关可以是常规继电器、光耦继电器等，要求具有较小的内阻，以实现微小电信号的通过；The switch unit is a plurality of switches correspondingly connected between a plurality of temperature sensors and the temperature compensation unit, and is used to open and close the temperature parameter transmission channel; the switch can be a conventional relay, an optocoupler relay, etc., and requires a small internal resistance to Realize the passage of tiny electrical signals;
通道控制单元，用于接收中央控制单元的命令并向开关单元发出对多个开关的择一导通命令；用于选择性的启闭开关，以实现其中一个温度传感器将所检测到的温度信号输出至中央控制淡单元。The channel control unit is used to receive the command of the central control unit and send a command to switch one of the switches to the switch unit; it is used to selectively open and close the switch, so that one of the temperature sensors will detect the temperature signal Output to the central control light unit.
本实施例中，多路温度检测系统还包括：In this embodiment, the multi-channel temperature detection system also includes:
通信单元，将中央控制单元所接收的数据参数传到上位机；上位机一般为电脑，用于接收数据进行储存，或者也可用于发出控制命令。The communication unit transmits the data parameters received by the central control unit to the upper computer; the upper computer is generally a computer, which is used to receive data for storage, or to issue control commands.
本实施例中，所述温度传感器为K型热电偶；温度补偿单元为对K型热电偶冷端温度补偿的芯片MAX6675；对于K型热电偶的冷端温度补偿采用MAX公司针对K型热电偶的冷端补偿所推出的芯片MAX6675，不仅能对K型热电偶进行冷端温度补偿，同时还能将K型热电偶在相应的温度下产生的电动势信号转换成12位的数字信号输出，方便单片机对其进行处理，并且控制方式也比较简单方便。In this embodiment, the temperature sensor is a K-type thermocouple; the temperature compensation unit is a chip MAX6675 for K-type thermocouple cold-junction temperature compensation; The chip MAX6675 launched by the company's cold junction compensation can not only compensate the cold junction temperature of the K-type thermocouple, but also convert the electromotive force signal generated by the K-type thermocouple at the corresponding temperature into a 12-bit digital signal output, which is convenient The single-chip microcomputer processes it, and the control method is relatively simple and convenient.
本实施例中，所述开关为光耦继电器；通道控制单元为用于对多个光耦继电器择一选择导通的译码器；本实施例采用的是一个译码器与多个光耦继电器结合来达到多路通道测量的目的，不同于现有技术中一个译码器搭配多个温度补偿芯片完成对每一路热电偶的冷端补偿以及数值转换输出的结构，简化结构的同时，保证测量精度；译码器每一个编码都只能有一个端输出相应的低电平，使得对应的通道的光耦继电器内部的二极管发光令得对应的通道导通传输该通道的K型热电偶产生的电动势信号送给芯片MAX6675处理，其它通道关闭，而后续继续选择。In this embodiment, the switch is an optocoupler relay; the channel control unit is a decoder for selectively conducting a plurality of optocoupler relays; what this embodiment uses is a decoder and a plurality of optocoupler relays. The combination of relays to achieve the purpose of multi-channel measurement is different from the existing technology in which a decoder is matched with multiple temperature compensation chips to complete the cold junction compensation and numerical conversion output of each thermocouple. It simplifies the structure while ensuring Measurement accuracy; each code of the decoder can only have one terminal output corresponding low level, so that the diode inside the optocoupler relay of the corresponding channel emits light, so that the corresponding channel conducts and transmits the K-type thermocouple of the channel to generate The electromotive force signal is sent to the chip MAX6675 for processing, other channels are closed, and the subsequent selection continues.
本实施例中，所述中央控制单元输出连接设有显示单元；显示单元采用的一块2.8寸的TFT彩色液晶显示屏，其分辨率为320*240；在显示屏显示主要信息是多路温度检测的每一路通道的实时温度值，以及当前的具体时间。In this embodiment, the output connection of the central control unit is provided with a display unit; a 2.8-inch TFT color liquid crystal display screen adopted by the display unit has a resolution of 320*240; the main information displayed on the display screen is multi-channel temperature detection The real-time temperature value of each channel, as well as the current specific time.
本实施例中，所述通信单元为PL2303串口通信芯片，所述上位机为PC机；通信模块采用的PL2303串口通信芯片，通过该芯片连接中央控制单元与上位机(PC机)的通信，将实时检测的温度数据发送到PC机上，然后再由PC机处理后储存为文本方式；芯片PL2303内置USB功能控制器、USB收发器、振荡器和带有全部调制解调器控制信号的UART，只需外接几只电容就可实现USB信号与RS232信号的转换，能够方便嵌入到各种设备；该器件作为USB/RS232双向转换器，一方面从主机接收USB数据并将其转换为RS232信息流格式发送给外设；另一方面从RS232外设接收数据转换为USB数据格式传送回主机。In the present embodiment, the communication unit is a PL2303 serial communication chip, and the upper computer is a PC; the PL2303 serial communication chip used in the communication module connects the communication between the central control unit and the upper computer (PC) through the chip, and the The temperature data detected in real time is sent to the PC, and then processed by the PC and stored as text; the chip PL2303 has built-in USB function controller, USB transceiver, oscillator and UART with all modem control signals, only a few external Only capacitors can realize the conversion of USB signal and RS232 signal, which can be easily embedded in various devices; as a USB/RS232 bidirectional converter, on the one hand, the device receives USB data from the host and converts it into RS232 information stream format and sends it to the outside On the other hand, the data received from the RS232 peripheral is converted into USB data format and sent back to the host.
光耦继电器为ac30s[okita]，导通内阻小，避免该K型热电偶输出的微弱电动势信号较多的损失；所述译码器为74HC154，为四至十六译码器；中央控制单元信号连接有时钟芯片DS1302，为低功耗实时时钟芯片，它可以对年、月、日、周、时、分、秒进行计时，且具有闰年补偿等多种功能，该型号芯片的结构以及工作原理在此不再赘述；如图2所示，光耦继电器与74HC154译码器之间的连接以及控制方式图2中具有清楚地表示，在此不再赘述。The optocoupler relay is ac30s[okita], which has a small conduction internal resistance and avoids the loss of the weak electromotive force signal output by the K-type thermocouple; the decoder is 74HC154, which is a four-to-sixteen decoder; the central control unit The signal is connected to the clock chip DS1302, which is a low-power real-time clock chip. It can time the year, month, day, week, hour, minute, and second, and has various functions such as leap year compensation. The structure and work of this type of chip The principle will not be repeated here; as shown in Figure 2, the connection between the optocoupler relay and the 74HC154 decoder and the control method are clearly shown in Figure 2, and will not be repeated here.
本实施例中，多路温度检测系统为八路温度检测系统，所述温度检测点以及对应的温度传感器均为八个。In this embodiment, the multi-channel temperature detection system is an eight-channel temperature detection system, and there are eight temperature detection points and corresponding temperature sensors.
最后说明的是，以上实施例仅用以说明本实用新型的技术方案而非限制，尽管参照较佳实施例对本实用新型进行了详细说明，本领域的普通技术人员应当理解，可以对本实用新型的技术方案进行修改或者等同替换，而不脱离本实用新型技术方案的宗旨和范围，其均应涵盖在本实用新型的权利要求范围当中。Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present utility model without limitation. Although the utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the utility model can be Modifications or equivalent replacements of the technical solutions without departing from the purpose and scope of the technical solutions of the utility model shall be covered by the claims of the utility model.
| Application Number | Priority Date | Filing Date | Title |
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| CN201520072490.6UCN204594593U (en) | 2015-02-02 | 2015-02-02 | Multi-channel temperature measurement system |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520072490.6UCN204594593U (en) | 2015-02-02 | 2015-02-02 | Multi-channel temperature measurement system |
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| CN204594593Utrue CN204594593U (en) | 2015-08-26 |
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| CN201520072490.6UExpired - Fee RelatedCN204594593U (en) | 2015-02-02 | 2015-02-02 | Multi-channel temperature measurement system |
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| CN109976404A (en)* | 2017-12-27 | 2019-07-05 | 佛山希望数码印刷设备有限公司 | Multipoint heating temperature control system and control method |
| CN109974880A (en)* | 2019-04-11 | 2019-07-05 | 重庆川仪控制系统有限公司 | A multi-channel thermocouple acquisition module |
| CN112050961A (en)* | 2019-06-06 | 2020-12-08 | 佛山市汉隆自动化技术有限公司 | Multichannel thermocouple temperature measurement circuit of high channel isolation voltage |
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