CN217821374U - Electronic temperature controller based on single chip microcomputer program control - Google Patents
Electronic temperature controller based on single chip microcomputer program control Download PDFInfo
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- CN217821374U CN217821374U CN202221091711.0U CN202221091711U CN217821374U CN 217821374 U CN217821374 U CN 217821374U CN 202221091711 U CN202221091711 U CN 202221091711U CN 217821374 U CN217821374 U CN 217821374U
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Abstract
An electronic temperature controller based on single chip program control belongs to the technical field of electronic temperature control, and is mainly provided with a Central Processing Unit (CPU), a high temperature sensor, a normal temperature sensor, a low temperature sensor, an A/D conversion circuit, three keys, a key detection circuit and a relay drive circuit, wherein an analog signal output by the high, normal and low temperature sensors is selected to be converted into a digital signal through A/D and input into the CPU, truth tables corresponding to the temperature resistances of the high, normal and low temperature sensors are edited in advance, the CPU embedded in programs is compared, operated and judged, control signals are respectively output to a display circuit, a buzzer drive circuit and the relay drive circuit, and the load is controlled to be powered on or powered off through a relay. The electronic temperature controller can be compatible with high, normal and low temperature detection and temperature control, and greatly facilitates production and practical application.
Description
Technical Field
The utility model relates to an electron control by temperature change technical field, in particular to electron temperature controller based on single chip microcomputer program control.
Background
The electronic temperature controller (resistance type) is measured by adopting a resistance temperature sensing method, generally adopts platinum wires, copper wires, tungsten wires and semiconductors (thermistors and the like) as temperature measuring resistors, and the resistors have the characteristics and the temperature sensing range respectively, so that the precision detection of a material in the whole temperature range is difficult to find at present. The temperature of the low temperature region, such as refrigerator and freezer, is adjusted to be in the range of-30 ℃ to 10 ℃; adjusting the temperature in a normal temperature area, such as the temperature in a house, to be within the range of 10 ℃ to 40 ℃; high temperature areas, such as the temperature of a compressor and a condenser of an air conditioner, the temperature of a water heater and the like, and the temperature is adjusted from 40 ℃ to 150 ℃; temperature sensors with different detection temperature ranges are needed, and correspondingly, low-temperature or normal-temperature or high-temperature electronic temperature controllers appear. Therefore, the variety and specification of the electronic temperature controller are various, and the production management of manufacturers and the practical application of customers are inconvenient.
Chinese patent publication No. CN201757862U, entitled "an electronic intelligent temperature controller based on encoder regulation" discloses an electronic intelligent temperature control mode based on regulation and control of a rotary encoder with a switch key, which sets a temperature value through an encoder, performs calculation and comparison with data of a sensing input module in a central processing module, displays a specific numerical value through a display module, and drives an output control module to control operation of related equipment. This temperature control method has the following disadvantages:
(1) Because the temperature resistance characteristics of the high-temperature or low-temperature sensors are different and compatible design of different temperature areas is not carried out, the high-temperature or low-temperature sensors do not work normally when different temperature sensors are used.
(2) Because the temperature setting adopts a rotary encoder, the operation is troublesome and is not intuitive.
(3) Because a specific start-stop temperature return difference value cannot be set, when the temperature is at a temperature control temperature critical point, the output control module may be continuously turned on or off, so that the control is out of control and even the controlled equipment is damaged.
(4) It is impossible to set a variety of scene modes for practical use.
Disclosure of Invention
The to-be-solved technical problem of the utility model is to provide an electronic temperature controller based on single chip microcomputer program control, when the access matches in the temperature sensor of different temperature regions, through the menu selection corresponding low temperature or normal atmospheric temperature or high temperature state and corresponding mode that key operation got into and establishes in the CPU, realize compatible low temperature, normal atmospheric temperature, high temperature detection and temperature control, made things convenient for production organization management and user's practical application greatly.
The utility model provides a technical solution is like this:
an electronic temperature controller based on single chip microcomputer program control comprises an A/D conversion circuit, a key detection circuit, a Central Processing Unit (CPU), a relay drive circuit, an 888 display circuit, a buzzer drive circuit and a direct current conversion circuit;
the output end of the direct current +12V input direct current conversion circuit provides a +5V working power supply for a central processing unit CPU and the key detection circuit and provides a +12V working power supply for the relay drive circuit respectively; selecting analog signals output by temperature sensors T0, T1 and T2 respectively arranged in a high-temperature area, a normal-temperature area and a low-temperature area, converting the analog signals into digital signals through an A/D conversion circuit and inputting the digital signals into a central processing unit CPU, inputting various temperature adjusting signals into the central processing unit CPU through manual operation of a set key, an add key and a subtract key and a key detection circuit, editing truth tables corresponding to temperature resistance values of the high-temperature sensor T0, the normal-temperature sensor T1 and the low-temperature sensor T2 in advance and embedding the truth tables into a central processing unit CPU program, respectively outputting control signals to an 888 display circuit input end, a buzzer driving circuit input end and a relay driving circuit input end through comparison, operation and judgment, wherein the 888 display circuit output end is connected with a display, the buzzer driving circuit output end is connected with a buzzer, and the relay driving circuit output end is sequentially connected with a relay and a load.
The input end of the A/D conversion circuit is only connected with the output end of any one of the high-temperature sensor T0, the normal-temperature sensor T1 and the low-temperature sensor T2, and the temperature measuring range of the temperature sensor is matched with the temperature control range of the load.
And the high-temperature sensor T0, the normal-temperature sensor T1 and the low-temperature sensor T2 all adopt NTC thermistors.
The central processing unit CPU adopts a central processing unit CPU of a single chip microcomputer with the model of TXM8C 1010.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses a temperature resistance parameter value based on compatible low temperature of singlechip procedure, normal atmospheric temperature and high temperature sensor to through simple and easy key operation and different temperature zone and the supporting of being suitable for temperature sensor, realize the temperature detection of low temperature, normal atmospheric temperature and the different temperature zone of high temperature and the control of temperature scene. The electronic temperature controller does not need to be changed, and the same electronic temperature controller can be applied to loads needing temperature adjustment in a working low-temperature area, a working normal-temperature area and a working high-temperature area, so that the production is convenient, and the practical application is convenient. The electronic temperature controller has strong design compatibility, specific temperature and state display, low power consumption and accurate measurement and temperature control; because the on-off temperature return difference value delta T of the relay can be preset, when the temperature is at the critical point of the temperature control temperature, the relay can not generate the action that the contact is not continuously opened or closed, and the rapid damage of the relay and the controlled equipment is avoided.
Drawings
Fig. 1 is an electrical schematic diagram of the electronic temperature controller based on the program control of the single chip microcomputer.
Fig. 2 is a schematic diagram of software logic function control of the electronic temperature controller shown in fig. 1.
Detailed Description
The present invention is further illustrated by the following examples.
Referring to fig. 1, an electronic temperature controller based on single chip microcomputer program control comprises a direct current conversion circuit 1, a central processing unit CPU2, a relay drive circuit 3, an a/D conversion circuit 4, a key detection circuit 5, an 888 display circuit 6 and a buzzer drive circuit 7;
the output end of the direct current +12V input direct current conversion circuit 1 respectively provides a +5V working power supply for a central processing unit CPU2 and a key detection circuit 5 and a +12V working power supply for a relay drive circuit 3; the method comprises the steps that an analog signal output by temperature sensors T0, T1 and T2 respectively arranged in a high-temperature area, a normal-temperature area and a low-temperature area is selected and converted into a digital signal through an A/D conversion circuit 4 and then input into a central processing unit CPU2, various temperature adjusting signals are input into the central processing unit CPU2 through manual operation of a set key 5-1, an adding key 5-2 and a subtracting key 5-3 and a key detection circuit 5, control signals are respectively output to an input end of an 888 display circuit 6, an input end of a buzzer driving circuit 7 and an input end of a relay driving circuit 3 through comparison, operation and judgment of the central processing unit CPU2 which is edited by truth tables corresponding to temperature resistance values of the high-temperature sensor T0, the normal-temperature sensor T1 and the low-temperature sensor T2 in advance, and is embedded with a program, the output end of the 888 display circuit 6 is connected with a display, the output end of the buzzer driving circuit 7 is connected with a buzzer, and the output end of the relay driving circuit 3 is sequentially connected with a relay and a load in series.
The input end of the A/D conversion circuit 4 is only connected with the output end of any one of the high-temperature sensor T0, the normal-temperature sensor T1 and the low-temperature sensor T2, and the temperature measurement range of the temperature sensor is matched with the temperature control range of the load.
The high-temperature sensor T0, the normal-temperature sensor T1 and the low-temperature sensor T2 all adopt NTC thermistors.
The relay is connected with related loads, and the input live wire is connected with the related loads to realize the driving control of the output loads through the closing or opening of the relay contacts. The CPU2 drives the relay through the relay drive circuit 3.
The central processing unit CPU2 adopts a single chip microcomputer central processing unit CPU with the model of TXM8C 1010. Three keys are connected with the input end of the CPU2 through a key detection circuit 5 and used for collecting information of the keys. Wherein, the setting key 5-1 is used for setting and confirming related functions; an additional key 5-2 for additional setting and forward page turning operation; and a minus key 5-3 for reduced setting and backward page turning operation.
The CPU2 drives three 8-character displays through an 888 display circuit 6 and is used for displaying relevant temperature and mode information; the buzzer is driven by the buzzer driving circuit 7 to give out sound warning, so that key response and related fault alarm are realized.
The utility model relates to a temperature control method of electronic temperature controller based on singlechip procedure step as follows:
(1) Selecting and connecting a high-temperature sensor T0 or a normal-temperature sensor T1 or a low-temperature sensor T2 matched with a controlled temperature area;
(2) Pressing the plus key 5-2 or the minus key 5-3 to enter a temperature adjusting mode, flashing and displaying a temperature value to be adjusted by a display, pressing the plus key 5-2 and the minus key 5-3 again to adjust the set controlled temperature value Ts, and then pressing the set key 5-1 to confirm the set controlled temperature value Ts;
(3) The method comprises the following steps that a setting key 5-1 is pressed for a long time to enter a starting and stopping temperature return difference value delta T setting of a setting mode, a displayer flickers and displays UXX, the initial value is UOO, OO represents that the starting and stopping temperature return difference value delta T is 0 ℃, and the starting and stopping temperature return difference value delta T is adjusted by pressing an adding key 5-2 and a subtracting key 5-3; the starting and stopping temperature return difference value delta T is selected to be slightly larger than the error value of the matched temperature sensor;
(4) Pressing the setting key 5-1 again to enter mode setting, displaying flashing on the display, pressing an additional key 5-2 or a subtraction key 5-3, and switching the setting mode among a heating mode Hon, a cooling mode hoF, a cooling mode Con and a heating mode CoF;
(5) Pressing the setting key 5-1 again To enter a temperature sensor setting mode, pressing the plus key 5-2 or the minus key 5-3, and switching the setting mode among the high-temperature sensor To, the normal-temperature sensor T1 and the low-temperature sensor T2;
(6) If the parameters or the modes are required to be modified, the setting key 5-1 is pressed again to operate in a circulating way; and when no key operation is performed within 5-10 seconds, the mode setting state is exited.
In a normal state, pressing the plus key 5-2 or the minus key 5-3 can enter a temperature adjusting mode, the temperature value to be adjusted is displayed on the nixie tube in a flashing way, and the plus key 5-2 or the minus key 5-3 is pressed again to increase or decrease the temperature value until the controlled temperature value Ts needing to be set.
Under normal display, the setting key 5-1 is pressed for a long time, the setting of the start-stop temperature return difference value delta T of the setting mode can be entered, the start-stop temperature return difference value delta T is the temperature difference value for driving the relay to be opened or closed, the display flickers to display UXX (the initial value is U00, 00 represents that the temperature return difference value is 0 ℃), and the start-stop temperature return difference value delta T is adjusted by pressing the plus key 5-2 or the minus key 5-3. In this state, the setting button 5-1 is pressed again to enter the mode setting, the display displays blinking, the heating mode Hon is defaulted, if another mode is set, the mode before blinking is switched among the heating mode Hon, the cooling mode HoF, the cooling mode Con, and the heating mode CoF by pressing the plus button 5-2 or the minus button 5-3. And pressing the setting key 5-1 again to enter a temperature sensor setting mode, and pressing the plus key 5-2 or the minus key 5-3 to switch among the high-temperature sensor T0, the normal-temperature sensor T1 and the low-temperature sensor T2.
Referring to fig. 2, after a controlled temperature value Ts, a start-stop temperature return difference value Δ T, an operation mode, and an applicable temperature sensor are set in sequence, a software program calls an R-T parameter table of the corresponding temperature sensor from a preset and stored database according to the type of the selected temperature sensor, the R-T parameter table and the detected temperature value of the temperature sensor are converted into voltage values by a/D and input to a CPU2 for comparison and determination, a real-time temperature value T is determined, and if the detected real-time temperature value T is not within the working temperature range of the selected temperature sensor, or an extremely high or extremely low open/short circuit value occurs, a display is driven to display an alarm flash, and a buzzer sounds an alarm sound and ends the current software execution. And if the detected real-time temperature value is within the working temperature range of the selected temperature sensor, driving the nixie tube to display the actual temperature value, and entering the working state of a set mode.
Claims (4)
1. The utility model provides an electron temperature controller based on single chip microcomputer program control which characterized in that: the electronic temperature controller comprises a direct current conversion circuit (1), a Central Processing Unit (CPU) (2), a relay drive circuit (3), an A/D conversion circuit (4), a key detection circuit (5), an 888 display circuit (6) and a buzzer drive circuit (7);
the output end of the direct current +12V input direct current conversion circuit (1) respectively provides a +5V working power supply for a central processing unit CPU (2) and a key detection circuit (5) and a +12V working power supply for a relay drive circuit (3); analog signals output by a high-temperature sensor T0, a normal-temperature sensor T1 and a low-temperature sensor T2 which are respectively arranged in a high-temperature area, a normal-temperature area and a low-temperature area are selected to be converted into digital signals through an A/D conversion circuit (4) and input into a central processing unit CPU (2), various temperature adjusting signals are input into the central processing unit CPU (2) through manual operation of a set key (5-1), an add key (5-2) and a subtract key (5-3) and a key detection circuit (5), control signals are output to an input end of an 888 display circuit (6), an input end of a buzzer driving circuit (7) and an input end of a relay driving circuit (3) respectively through comparison, operation and judgment by the central processing unit CPU (2) which is edited by truth tables corresponding to temperature resistance values of the high-temperature sensor T0, the normal-temperature sensor T1 and the low-temperature sensor T2 and is embedded in a program, the output end of the 888 display circuit (6) is connected with a display, the output end of the buzzer driving circuit (7) is connected with the relay and the output end of the relay driving circuit (3) is sequentially connected with a relay and a load in series.
2. The electronic temperature controller based on the single chip microcomputer program control according to claim 1, characterized in that: the input end of the A/D conversion circuit (4) is only connected with the output end of any one of the high-temperature sensor T0, the normal-temperature sensor T1 and the low-temperature sensor T2, and the temperature measurement range of the temperature sensor is matched with the temperature control range of the load.
3. The electronic temperature controller based on the single chip microcomputer program control according to claim 1, characterized in that: and the high-temperature sensor T0, the normal-temperature sensor T1 and the low-temperature sensor T2 all adopt NTC thermistors.
4. The electronic temperature controller based on the single chip microcomputer program control according to claim 1, characterized in that: the central processing unit CPU (2) adopts a central processing unit CPU of a single chip microcomputer with the model of TXM8C 1010.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221091711.0U CN217821374U (en) | 2022-05-09 | 2022-05-09 | Electronic temperature controller based on single chip microcomputer program control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221091711.0U CN217821374U (en) | 2022-05-09 | 2022-05-09 | Electronic temperature controller based on single chip microcomputer program control |
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| Publication Number | Publication Date |
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| CN217821374U true CN217821374U (en) | 2022-11-15 |
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| CN202221091711.0U Active CN217821374U (en) | 2022-05-09 | 2022-05-09 | Electronic temperature controller based on single chip microcomputer program control |
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