CN210345646U

CN210345646U - Temperature control system of electric fire box for heating

Info

Publication number: CN210345646U
Application number: CN201921043711.1U
Authority: CN
Inventors: 高毅
Original assignee: Guiyang University
Current assignee: Guiyang University
Priority date: 2019-07-05
Filing date: 2019-07-05
Publication date: 2020-04-17
Anticipated expiration: 2029-07-05

Abstract

The utility model belongs to the technical field of circuit control systems, and discloses a temperature control system of a heating electric fire box, which is provided with a singlechip for data analysis and processing; the key device is connected with the singlechip and used for inputting the operation data of the singlechip; the relay is connected with the singlechip and used for realizing the on-off of the circuit; the reset device is connected with the singlechip and is used for realizing the data reset of the singlechip; the display device is connected with the singlechip and used for realizing the display of the detection data; and the temperature and humidity sensor is connected with the singlechip and used for realizing temperature and humidity detection. The whole electric fire box is improved, and the electric fire box is easy to maintain due to the arrangement mode and the structure of each component inside the electric fire box. The digital sensor measurement technology is utilized to measure the temperature parameters required by the electric fire box in different areas and different weathers, and the deviation is obtained by comparing the temperature parameters with the upper and lower limits of the set temperature through the display of the LED.

Description

Temperature control system of electric fire box for heating

Technical Field

The utility model belongs to the technical field of circuit control system, especially, relate to a temperature control system of electric fire box for heating.

Background

Currently, the current state of the art commonly used in the industry is such that:

nowadays, various household appliances are continuously updated, automation and intellectualization are more and more favored by wide consumers, and through market research, few digital electric fire boxes are available in the market, and most of the electric fire boxes are traditional electric fire boxes. When the traditional electric fire box is used for heating, the temperature can only be roughly judged by the self-feeling of the user, the current temperature value cannot be clearly understood, and the phenomenon that the heat is sometimes equivalent sometimes and is relatively cold can occur when the traditional electric fire box is used for heating, so that the user can always feel uneasy. However, in the current digital age, the traditional electric fire box is increasingly unable to meet the outperforming needs of people, and the optimal design of the traditional electric fire box is urgent.

In summary, the problems of the prior art are as follows:

at present, a transistor circuit or a 51 single chip microcomputer is mostly selected as a core component of a temperature monitoring system, so that the circuit of the whole circuit is quite complex, the stability of the whole circuit is poor, and the reliability of measured data is not high

SUMMERY OF THE UTILITY MODEL

Problem to prior art existence, the utility model provides a temperature control system of electric fire box for heating.

The utility model is realized in such a way that the temperature control system of the electric fire box for heating is provided with a singlechip for data analysis and processing;

the key device is connected with the singlechip and used for inputting the operation data of the singlechip;

the relay is connected with the singlechip and used for realizing the on-off of the circuit;

the reset device is connected with the singlechip and is used for realizing the data reset of the singlechip;

the display device is connected with the singlechip and used for realizing the display of the detection data;

and the temperature and humidity sensor is connected with the singlechip and used for realizing temperature and humidity detection.

Further, the display device adopts an LED nixie tube.

Furthermore, the temperature and humidity sensor is installed inside the electric fire box, and the power supply end of the temperature and humidity sensor is connected with the power supply end of the single chip microcomputer in parallel.

When the electric fire box is electrified, the single chip microcomputer is also electrified, and communication between the temperature sensor and the single chip microcomputer is achieved.

Further, the inside welding of electric fire box has protector, the outside parcel of electric fire box has the heat preservation device.

The anti-interference ability of electric fire box is strong, and the interference immunity to whole system and the interference immunity's of each components and parts protective properties are good, and the electric fire box let overall structure pleasing to the eye, more comfortable when using.

To sum up, the utility model discloses an advantage and positive effect do:

the utility model discloses the automation of control system and the digitization of temperature display and the simplification of whole circuit are accomplished to electric fire box based on PIC singlechip. The utility model discloses to improve whole electric fire box's whole, with the placing means and the structure of each components and parts of electric fire box inside, will make electric fire box reach the design mesh ground of easy maintenance. In the design of the whole temperature control main control circuit, a PIC single chip microcomputer is used for improving the traditional 51 single chip microcomputer monitoring technology, then a digital sensor measuring technology is used for measuring temperature parameters required by the electric fire box in different regions in different weathers, the deviation is obtained by comparing the temperature parameters with the set upper and lower temperature limits through the LED display, and different requirements are met by adjusting the upper and lower temperature limits. The electric fire box has the advantages of reasonable overall structural design, attractive appearance, high practicability, good stability of the whole master control system, high reliability and simple circuit. A PIC single chip microcomputer is selected as a core, technical innovation is performed on the whole temperature control system circuit, the whole system can be suitable for different working conditions, and the universality and interchangeability of the system are enhanced.

Drawings

Fig. 1 is a schematic structural diagram of a temperature control system of a heating fire box according to an embodiment of the present invention.

Fig. 2 is a pin diagram of the single chip microcomputer provided by the embodiment of the present invention.

Fig. 3 is a schematic circuit diagram of a reset device according to an embodiment of the present invention.

Fig. 4 is a working principle diagram of a temperature control system of a heating fire box provided by the embodiment of the invention.

Detailed Description

In order to further understand the contents, features and functions of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings.

To the problem that prior art exists, the utility model provides a temperature control system of electric fire case is used in heating, it is right to combine below the attached drawing 1 to 3 the utility model discloses do detailed description.

In a traditional temperature detection system, a designer often uses a 51-chip microcomputer as a core processor to design a main control circuit; because the technology of the temperature sensor is updated very fast, most of the temperature sensors are digital temperature sensors, if a 51 single chip microcomputer is also selected as a core controller for design when the whole main control system is designed, the problems of complex peripheral circuit, inaccurate real-time display, poor anti-interference performance and the like can occur due to the technical characteristics of the 51 single chip microcomputer. Synthesize these problems that appear above, utilize the digital characteristics of PIC singlechip at utility model, simplified AD converting circuit for monitoring data signal is digital, realization LED that can be more convenient and accurate shows. Meanwhile, the PIC singlechip is matched with the DS18B20 digital temperature sensor in the utility model, so that the measurement error of the traditional measuring instrument such as a mercury thermometer which is easy to appear can be avoided, and the complicated peripheral circuit of the traditional temperature monitoring system can be reduced.

The utility model discloses use the PIC16F877A singlechip as control core, utilize the singlechip to control each external device and constitute whole temperature major control system, come the design to whole system through utilizing PIC16F877A, DS18B20, the relevant hardware of LED. The temperature monitoring is to collect temperature data in the electric fire box through DS18B20, the collected temperature data is transmitted to PIC16F877A to be processed, then the current measured temperature value is displayed through LEDs, the upper and lower limits of the temperature are displayed by using two groups of LEDs, the range value of the upper and lower limits of the temperature is adjusted by arranging keys, the quick heating is realized when the temperature is less than the lower limit, the power is cut off when the temperature is higher than the upper limit, and the whole environment is controlled to be in a stable temperature range.

The PIC16F877A single chip microcomputer pin generally has multiple functions except for single function of power supply VDD and VSS. The I/O port of the PIC16F877A singlechip may be roughly divided into A, B, C, D four ports, with each port being made up of two parts, a direction control register and a data control period register.

(1) A port

The a port has 6 pins, and the other 5 ports except RA4 can be used as analog voltage input ports for a/D conversion, and when the RA port is used as analog input, a register of ADCON1 needs to be configured, when the RA port is used as input, a direction register TRIS needs to be set to 1, and when the RA port is used as output, a direction register TRIS needs to be set to 0.

(2) B port

The B port has 8 pins. The 8 pins all have a weak pull-up enable control, controlled by the RBPU in the OPTION register, if weak pull-up is enabled. The RB port as input is in flight. When the port is input, the direction register TRIS needs to be set to 1, and when the port is output, the direction register TRIS needs to be set to 0.

(3) C port

The C port has 8 pins, wherein 8 ports can be used as a common I/O port, and when the C port is used as an input, the direction register TRIS needs to be set to 1, and when the C port is used as an output, the direction register TRIS needs to be set to 0.

(4) D port

(5) E port

The E port only has 3 pin I/O ports which can not only be used as a common port but also be used as an analog voltage input port for A/D conversion.

When a certain port is used as a common I/O, the corresponding direction control register and data control register are only needed to be set for use.

The type of the temperature and humidity sensor is as follows: DS18B20, a single-bus digital temperature sensor of the temperature and humidity sensor, the temperature measuring range of-55 to +125 ℃, the temperature measuring precision of the temperature and humidity sensor is +0.5 ℃, data are directly transmitted in a single-bus mode during temperature measurement, the anti-interference capability of the whole system is effectively improved, and meanwhile the universality and the flexibility of the sensor are also improved.

Because the temperature sensor only has one line, the data and the instruction can be sent only by using the line, the requirement on the time sequence in the whole using process is quite strict, and an accurate temperature value can be obtained only by controlling the time sequence.

The temperature control process is that when the power is switched on and the 'operation' button is pressed, the whole circuit starts to operate, the DS18B20 temperature sensor measures the external temperature, the measured data is transmitted to the PIC singlechip to carry out corresponding temperature data conversion, the collected binary codes are converted into decimal codes to be displayed on the two LED nixie tubes in the middle, the two nixie tubes on the left display the upper limit of the temperature while operating, and the lower limit of the temperature is displayed on the right. When writing the program, we set the upper limit of the temperature to 39 degrees and the lower limit of the temperature to 29 degrees so that their temperature difference is 10 degrees.

The whole system operation process is that the temperature sensor collects the temperature value of the external environment to compare with the upper limit and the lower limit of the set temperature, when the power is just on, the temperature in the electric fire box is lower than the lower limit of the set temperature, at the moment, the two relays are simultaneously connected with the three heating wires to simultaneously supply heat to the electric fire box, when the temperature of the electric fire box is heated for a period of time, the temperature measured at the moment is higher than the lower limit temperature, at the moment, the heat supply of the whole electric fire box at one relay port is completed by one heating wire, the temperature of the electric fire box is stabilized in the range under the normal condition, however, the temperature of the system is continuously increased due to certain reasons, at the moment, the monitored temperature is higher than the upper limit of the set temperature, at the moment, the two relays are simultaneously disconnected from the whole electric fire.

The user can come to carry out the follow new settlement to the upper and lower limit of temperature of whole temperature control system according to the needs of weather, makes it obtain a very comfortable temperature range, and the maximum temperature of life-span entire system only can be modulated to 69 degrees when for better protection heating wire, and such temperature value has already been accomplished and can have satisfied actual fire-heating needs.

When the system needs to run for a period of time, the system needs to be run again by means of the reset device, and the reset device can enable the single chip microcomputer and other related devices to be restored to the initial position of the program design, so that the whole program runs from the beginning.

The PIC16F877A singlechip has a reset pin RST and is active high. When the user releases the reset, the reset key system is pressed to immediately enter the reset.

The reset circuit of singlechip has two kinds: power-on automatic reset and key manual reset.

The automatic sleep mode is realized by utilizing the reset function of the single chip microcomputer, and the temperature range can be controlled by utilizing the reset function only by setting the upper and lower temperature limits reasonable in design. When the crystal oscillator that singlechip chose for use in the temperature control circuit is 4MZH, the utility model discloses with the manual method of recovering of button.

The key device is divided into a matrix type and a general key type, the matrix type key is usually selected under the condition that the whole system needs to be very key, and the matrix type key can effectively save I/O ports.

The LED liquid crystal display screen is selected as a display device in the temperature display, the display device is mainly used for displaying the measured temperature and the upper and lower limit RB ports of the temperature for displaying the upper limit of the set temperature, the C port is used for displaying the current temperature value of the electric fire box measured by the DS18B20 sensor, and the D short space is used for displaying the lower limit value of the set temperature.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all the modifications and equivalents of the technical spirit of the present invention to any simple modifications of the above embodiments are within the scope of the technical solution of the present invention.

Claims

1. The temperature control system of the heating electric fire box is characterized in that the temperature control system of the heating electric fire box is provided with a single chip microcomputer for data analysis and processing;

2. The temperature control system of electric heating box according to claim 1, wherein said display device is LED nixie tube.

3. The temperature control system of the heating electric fire box according to claim 1, wherein the temperature and humidity sensor is installed inside the electric fire box, and a power supply end of the temperature and humidity sensor is connected in parallel with a power supply end of the single chip microcomputer.

4. The temperature control system of the electric heating box according to claim 3, wherein a protection device is welded inside the electric heating box, and a heat preservation device is wrapped outside the electric heating box.

5. The temperature control system of the warming fire box according to claim 1, wherein the single chip microcomputer is a PIC16F877A single chip microcomputer, pins of the PIC16F877A single chip microcomputer are provided with power supplies VDD and VSS; the I/O port of the PIC16F877A singlechip is divided into A, B, C, D four ports, and each port consists of two parts, namely a direction control register and a data control period register.