CN201145860Y - Real-time smart thermostat - Google Patents

Abstract

The utility model relates to a real-time intelligent temperature controller, which includes a micro-controller module, a temperature detection module, and a display module. A real-time clock module for real-time control, an input module for setting operating parameters and controlling the display output of the display circuit, an output module for cutting off and restoring the connection between the device and the power supply, and a module for providing a communication interface for the microcontroller module The communication module, because it is equipped with a current detection module, monitors the current overload, phase loss, and imbalance of the equipment. When the above faults occur, the output protection circuit will cut off the connection between the equipment and the power supply, thereby protecting the compressor. The real-time clock module realizes The time-segmented control of the temperature and the setting of the communication module realize the centralized control of the equipment.

Description

Real-time smart thermostat

technical field

The utility model relates to an intelligent temperature controller used for automatic temperature control in a freezing and refrigerating system.

Background technique

Intelligent thermostats are widely used in large supermarkets, industrial refrigerators, and freezers. They mainly use single-chip microcomputers as the core to realize automatic temperature control. The control circuits of existing intelligent controllers usually include single-chip microcomputers, power supply circuits for single-chip The temperature sensor and the display for displaying the temperature are arranged on the corresponding equipment, and the single-chip microcomputer judges according to the preset temperature range and the temperature sensed by the temperature sensor to realize automatic control of the temperature, but the existing intelligent thermostat has the following Disadvantages: 1. The thermostat only has temperature control, and lacks the display control of the operating current of the unit. If current overload, phase loss or three-phase imbalance occurs, it cannot be detected in time, so the fault cannot be removed in time to protect the unit; 2. Temperature The controller cannot perform real-time monitoring and control; 3. It is impossible to perform centralized control on occasions where multiple thermostats are used.

Contents of the invention

The purpose of the utility model is to provide an intelligent temperature controller capable of centralized control and real-time current detection in order to overcome the deficiencies of the prior art.

In order to achieve the above object, the technical solution adopted by the utility model is: a real-time intelligent temperature controller, including a microcontroller module, a temperature detection module connected to an input terminal of the microcontroller module for sensing temperature, A power supply circuit for converting alternating current into direct current to supply power for the microcontroller module, and a display module connected to an output terminal of the microcontroller module, which also includes:

The current detection module is connected to an input terminal of the microcontroller module, and is used to input the induced current to the microcontroller module;

A real-time clock module, controlled by the microcontroller module, is used to provide the current time and realize real-time control;

The input module is connected with an input terminal of the micro-controller for setting the working parameters and controlling the display output of the display circuit;

The output module is connected with an output terminal of the microcontroller module, and is used to cut off and restore the connection between the device and the power supply;

The communication module is electrically connected with the microcontroller module to provide a communication interface for the microcontroller module.

When in use, the microcontroller module collects the temperature sensed by the temperature detection module in real time and controls the temperature of the device and displays it through the digital tube. At the same time, the microcontroller module also collects the current value sensed by the current detection module in real time. The operating current of the equipment is detected and judged, and displayed through the digital tube. When faults such as current overload, phase loss, and imbalance occur, the microprocessor module outputs a control signal to drive the output module to cut off the connection between the equipment and the power supply, and an alarm is issued. information, thereby effectively protecting the equipment; and by setting the real-time clock module, the thermostat has the function of real-time clock display, which can be controlled by time intervals, and it has a communication interface, so that the thermostat can be connected with the computer to realize network control.

Due to the application of the above-mentioned technical solution, the utility model has the following advantages compared with the prior art: since the current detection module is provided to monitor the current overload, phase loss and unbalance of the equipment, when the above-mentioned fault occurs, the output protection circuit will The connection between the equipment and the power supply is cut off to protect the compressor. The real-time clock module realizes the time-segmented control of the temperature, and the setting of the communication module realizes the centralized control of the equipment.

Description of drawings

Accompanying drawing 1 is the electric principle block diagram of real-time intelligent temperature controller of the present utility model;

Accompanying drawing 2 is the utility model microcontroller module circuit schematic diagram;

Accompanying drawing 3 is the electrical schematic diagram of the utility model current detection module

Accompanying drawing 4 is the electrical schematic diagram of the temperature measuring module of the present invention;

Accompanying drawing 5 is the electric schematic diagram of the utility model power supply circuit;

Accompanying drawing 6 is the electrical schematic diagram of the utility model output module;

Accompanying drawing 7 is the electric principle diagram of display circuit of the present utility model;

Accompanying drawing 8 is the electrical schematic diagram of the input module of the present utility model;

Accompanying drawing 9 is the electrical schematic diagram of the new communication module of the present utility model;

Accompanying drawing 10 is the electrical schematic diagram of the real clock module of the present invention;

Among them: 1. Microcontroller module; 2. Temperature detection module; 3. Power supply circuit; 4. Display module; 5. Current transformer; 6. Real-time clock module; 7. Input module; 8. Output module; 9. Communication Module; 10. Current detection module;

Detailed ways

Below in conjunction with accompanying drawing, illustrate in detail the specific content of the present utility model:

The electrical principle block diagram of the intelligent thermostat as shown in accompanying drawing 1, comprises microcontroller module 1, is connected with the input terminal of this microcontroller module 1 and has temperature detection module 2, current detection module 10, real clock module 6 , power supply circuit 3, input module 7, display module 4, output module 8 that are connected with microcontroller module 1 output end, and the communication module 9 that carries out two-way communication connection with described microcontroller module 1, below first Each functional module is introduced as follows:

Figure 2 shows the electrical schematic diagram of the microcontroller module 1. The core of the module is a single-chip microcomputer, and the single-chip microcomputer has a built-in A/D converter, so that the input analog signal can be converted into a digital signal and displayed by a digital tube.

Fig. 3 is the electrical principle diagram of current detection module 10, and this current detection module 10 comprises current transformer 5, and in the present embodiment, current transformer is three mutual induction coils, is connected with each coil a voltage dividing resistor, voltage dividing The resistor is connected to the input port of the single-chip microcomputer. When in use, pass the three phase wires of the three-phase power supply of the equipment to be controlled through the corresponding coils, and input the voltage signal to the single-chip microcomputer through the voltage dividing resistor. The A/ The D converter converts the voltage signals of different phase lines into corresponding digital current values, and displays them through the display module 4, so the single-chip microcomputer can monitor the operating current of the equipment in real time, thereby maintaining the normal operation of the equipment. The above-mentioned A The /D converter can choose a 9-12-bit A/D converter, which converts the analog signal into a digital signal at a higher sampling rate and lower sampling resolution, and then uses oversampling, noise shaping and digital filtering techniques, To improve the effective resolution, thereby providing the temperature measurement accuracy of the intelligent thermostat.

Fig. 4 is the electrical schematic diagram of the temperature detection module 2, the temperature detection module is connected in series by a temperature sensor (not shown in the figure) and a voltage dividing resistor and connected to the input terminal of the single-chip microcomputer, and the single-chip microcomputer collects the voltage signal of the voltage dividing resistor , the voltage signal is converted into a digital signal through the internal A/D converter, and the single-chip microcomputer calculates the digital signal and displays the corresponding temperature value through the display module 4, so the intelligent thermostat of this embodiment can monitor the environment and temperature in real time. The temperature of the device is monitored.

Fig. 5 is the electric schematic diagram of power supply circuit 3, and this power supply circuit 3 is used for providing DC working voltage for single-chip microcomputer, and this circuit is formed by series connection of transformer, rectifier, filter capacitor, voltage stabilizer successively, and AC mains (220V alternating current) passes through The transformer is converted into low-voltage alternating current, and the low-voltage alternating current is rectified and filtered by a rectifier and a filter capacitor to become a low-voltage direct current, which is further stabilized by a voltage regulator and output to the microcontroller and other functional modules.

Fig. 6 is the electrical schematic diagram of output module 8, and this output module 8 is formed by series connection of driver chip, relay, and described driver chip integrates a plurality of transistors, and the collector of each transistor is connected with a relay, in use At this time, one of the relays can be connected to the power supply, and the other relays are used to realize fan control and defrosting control. If the single-chip microcomputer finds faults such as overcurrent, phase loss or unbalance during the current detection process, it will output a high level Drive the transistors in the drive chip to control the work of each relay, that is, disconnect the connection with the power supply, and send an alarm signal. When the current returns to normal, the relay will automatically recombine under the control of the single-chip microcomputer.

Fig. 7 is a schematic circuit diagram of the display module, the display module 4 is mainly composed of digital tubes, and the output port of the single-chip microcomputer is connected with each section of the digital tubes to control the display content.

Fig. 8 is a schematic circuit diagram of the input module 7, which is mainly composed of multiple keys and pull-up resistors connected in series, when a key is pressed, the output is low level; when no key is pressed, the output is high level, The input module 7 selects different keys for different parameter setting and output display control, and the single-chip microcomputer performs corresponding control by detecting the high and low levels of the input module 7 .

Fig. 9 is the circuit principle diagram of communication module 9, and this communication module 9 is connected with single-chip microcomputer and is used for providing communication interface for microcontroller module, by setting communication module 9, the thermostat of the present embodiment can be connected with equipment such as computer, Man-machine dialogue and multi-machine connection network control can be realized through the communication protocol. In this embodiment, the communication module mainly uses the MAX485 chip.

Fig. 10 is a schematic diagram of the circuit of the real clock module 6. The circuit is composed of a clock chip, a crystal oscillator, a resistor, and a capacitor. The single-chip microcomputer performs read and write control on the clock chip, so that the controller can be controlled according to Beijing time. At the same time, the use of capacitors enables the real-time clock to continue to run when the controller is powered off, ensuring the accuracy of Beijing time. And the time can be displayed through the digital tube, and the clock can also be adjusted and set through the buttons of the display module. In this embodiment, the clock chip is HT1302, the capacitor is 0.22F, and the crystal oscillator is 32768Hz.

The specific working process is as follows: the single-chip microcomputer collects the temperature sensed by the temperature sensor in real time and controls the temperature of the equipment and displays it through the digital tube. At the same time, the single-chip microcomputer also collects the current value induced by the current transformer in real time to detect and judge the operating current of the equipment , and display it through the digital tube. When faults such as current overload, phase loss, and unbalance occur, the MCU outputs the control signal to drive the output module to cut off the connection between the device and the power supply, and sends out an alarm message, thereby effectively protecting the device; and by setting Real-time clock module, the thermostat has the function of real-time clock display, which can be controlled by time division. At the same time, it has a communication interface, so that the thermostat can be connected with the computer to realize network control.

Claims (8)

1, a kind of real time intelligent temperature controller, comprise micro controller module (1), the temperature detecting module (2) that is used for temperature sensor of being connected with described micro controller module (1) one input end, be used for alternating current be converted to power circuit (3) that direct current is described micro controller module (1) power supply, with the display module (4) that described micro controller module (1) one output terminal is connected, it is characterized in that: it also comprises

Current detection module (10) is connected with an input end of described micro controller module (1), is used for induction current is inputed to micro controller module (1);

Real time clock module (6) is controlled by described micro controller module (1) and is used to provide the current time and realizes control in real time;

Load module (7), the demonstration that is used to set running parameter and control display circuit (4) that is connected with an input end of microcontroller (1) is exported;

Output module (8) is connected with an output terminal of described micro controller module (1), is used to cut off and being connected of restorer and power supply;

Communication module (8), being electrically connected with described micro controller module (1) is used to described micro controller module (1) that communication interface is provided.

2, real time intelligent temperature controller according to claim 1 is characterized in that: described micro controller module (1) is a single-chip microcomputer.

3, real time intelligent temperature controller according to claim 1 and 2, it is characterized in that: described micro controller module (1) is built-in with A/D converter, and described A/D converter is used for temperature detecting module (2) is become digital signal with current detection module (10) input analog signal conversion wherein.

4, real time intelligent temperature controller according to claim 3 is characterized in that: described A/D converter is 8～12 A/D converters.

5, real time intelligent temperature controller according to claim 1 is characterized in that: the divider resistance that described current detection module (10) comprises current transformer (5), is electrically connected with described current transformer (5).

6, real-time intelligent controller according to claim 1 is characterized in that: described display module (4) is the charactron display circuit.

7, real time intelligent temperature controller according to claim 1, it is characterized in that: described output module (7) comprise one the tunnel with (1) transistor that output terminal is connected of described micro controller module, with the relay that transistor is connected in series mutually, described micro controller module (1) thus described relay closure or openness are controlled in the conducting of driving transistors and disconnection.

8, real time intelligent temperature controller according to claim 1 is characterized in that: described communication module (8) is the communication module of RS-485 for bus.

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