CN102122183B - Large-LCD touch-type programmable temperature controller - Google Patents

Abstract

The invention relates to a temperature controller, in particular to a large-LCD (Liquid Crystal Display) touch-type programmable temperature controller. The hardware structure of the large-LCD touch-type programmable temperature controller comprises an MCU (Microprogrammed Control Unit) main control circuit, wherein a power supply circuit and a keying circuit are connected to the MCU main controlcircuit, a crystal oscillator circuit and a man-machine display circuit are also connected to the MCU main control circuit and the MCU main control circuit is connected through connecting circuits ofan upper circuit board and a lower circuit board for controlling an output interface circuit. According to the invention, the need of current society for an environment-friendly and energy-saving temperature controller is met, potential safety hazards in the use of the temperature controller are lessened, the reliability of the temperature controller and a control system to which the temperature controller belongs is improved, a user can adjust needed parameters according to personal desires, user experiences are improved, and the requirement on a user for the individualized adjustment of a target temperature in practical applications is met.

Description

A kind of big lcd touch formula Programmable Temperature controller

Technical field

The present invention relates to the controller field, specifically provide a kind of big lcd touch formula Programmable Temperature controller.

Background technology

Temperature controller can be divided into mechanical type, electronic type and intellectual three kinds according to type, and the temperature of mechanical temperature controller is floated greatly, temperature control is inaccurate, except special application scenario, seldom adopts at present.The temperature control performance of electronic temperature controller is greatly improved than mechanical type, but has problems such as poor anti jamming capability, reliability is low, security is low, makes it more and more be difficult to satisfy the needs of current social development, presents the trend that is eliminated gradually.Intellectual temperature controller not only has advantages such as temperature control is accurate, perfect in shape and function, integrated level height, good reliability, and has significantly improved economy and the applicability of temperature controller, yet intellectual temperature controller at least also exists following shortcomings in its evolution:

1, existing intellectual temperature controller is in order to save installation cost, the mode of connection that adopt single line to advance, single line goes out more, and this object/load that controller can be regulated and control is less, can not finish complicated multi objective control.In order further to improve the ability of the plug-in load equipment of controller, just need the intellectual temperature controller of development a new generation.

2, existing intellectual temperature controller is not the mode that adopts 220 volts of external power source, adopts battery powered mode exactly.For the former, controller adopts the mode of 220 volts of external power source, can cause potential safety hazard to a certain extent to the user of this way to take power controller of use, the personal safety that might jeopardize the user.For the latter, controller adopts the powered battery mode, temperature controller is using and is managing and can bring a series of problem to the user, as using more place in office building, hotel, hotel room etc., battery has not only additionally increased user's use cost, and the inspection of battery and change and also to have managerial difficulty.For credibility, the security that strengthens controller, further improve the economic benefit of controller, promote the efficiency-cost ratio of controller, just need the intellectual temperature controller of development a new generation.

3, existing intellectual temperature controller adopts small-sized liquid crystal display to show, though this display mode has been simplified design difficulty, reduced development cost, the function that little liquid crystal can show is less, has restricted the raising of controller function integrated level undoubtedly; In addition, little liquid crystal makes that also the aesthetic property of controller is not good, and under the situation of dim light, returns the online real time inspection of user and bring many inconvenience.Along with the progress of liquid crystal technology, in order further to improve the integrated level of controller, improve the aesthetics of controller, just need the intellectual temperature controller of the big liquid crystal band demonstration backlight of development a new generation.

4, existing intellectual temperature controller uses the mechanical type button more, the mechanical type button is owing to exist the restriction of access times (mechanical property), and may exist in using and have a mind to or damage unintentionally, cause trouble and inconvenience all for the use of controller, even cause it normally to use.In order further to improve reliability, maintainability and the protection of controller, reduce the maintenance cost that controller uses the later stage, just need the touch intelligent temperature controller of Development of New Generation.

5, existing intellectual temperature controller adopts vigour joint mode to controlled device more, can not satisfy the requirement of green energy conservation well, can't provide the suitable degree of temperature adjusting in each stage, and then reduces the consumption to the energy; Can't make only adjusting to the basic object " people " of serving; Also can't temperature adjustment and energy-conservation between make the selection of balance, cause the adjusting efficient of temperature controller to be had a greatly reduced quality.

Summary of the invention

The present invention be directed to above deficiency, a kind of big lcd touch formula Programmable Temperature controller is provided, it has solved the requirement of current social to green energy conservation, reduced the potential safety hazard during temperature controller uses, improved the reliability of temperature controller self and affiliated control system thereof, realized that the user according to the required target component of self wish regulation and control, has increased user's experience, satisfied the demand of user individual adjusting temperature in the practical application.

The technical scheme that a kind of big lcd touch formula Programmable Temperature controller of the present invention adopts is:

A kind of big lcd touch formula Programmable Temperature controller, comprise the MCU main control circuit, described MCU main control circuit is connected with power circuit and key circuit, described MCU main control circuit also is connected with crystal oscillating circuit and people-machine display circuit, and passes through the connecting circuit connection control output interface circuit of two circuit boards up and down.

The MCU main control circuit also is connected with temperature sensing circuit.

The MCU main control circuit also is connected with the storage of subscriber data circuit.

The MCU main control circuit also is connected with the wire jumper circuit.

The MCU main control circuit also is connected with buzzer alarm circuit.

Power circuit is formed by exchanging 24 volts of power supply electronic circuits and battery power electronic circuit.

People-machine display circuit is made up of touch-screen electronic circuit, liquid crystal display electronic circuit and backlight screen electronic circuit.

Key circuit is stirred the key electronic circuit by three button key electronic circuits and two and is formed.

Temperature sensing circuit connects corresponding detection gauge tap.

Crystal oscillating circuit is made up of major clock electronic circuit and secondary clock electronic circuit.

A kind of big lcd touch formula Programmable Temperature controller of the present invention is on the basis of having reduced the temperature control system potential safety hazard, improved the function of existing temperature controller, realize the soft joint of temperature controller to controlled device, satisfied temperature control equipment to requirements of saving energy, had following advantage:

1, life-cycle period expense (LCC, Life Cycle Cost) is low.Big lcd touch formula Programmable Temperature controller has carried out complete Failure Mode Effective Analysis (FMEA in design process, FailUre ModeEffects Analysis), fault tree analysis (FTA, Fault Tree Analysis), electromagnetic compatibility/interference design (EMC, Electromagnetic Compatibility/EMI, ElectromagneticInterference), the electrostatic prevention design, thermal design, fail-safe analysis such as anti-vibration and environmental stress resistance and design, product has higher reliability, testability and maintainability level, have lower O﹠M cost, thereby greatly reduce the life-cycle period expense of product.

2, Product Green, environmental protection, energy-conservation.Big lcd touch formula Programmable Temperature controller has been considered current social to requirements of saving energy, and the total system of controller all adopts the energy-saving scheme design, satisfies the energy-conservation mandatory provision of American-European countries.Controller adopts the cold and hot mixing standby redundancy power supply of double loop power supply, and when adopting alkaline electro battery-powered, controller can move some months continuously, and controller is high to the effective rate of utilization of supplying cell, the quiescent point electric current average out to I of system _Static≈ 1.07mA can farthest save the cost of consumptive material for the user; If adopt external power source, then be not subjected to the restriction of service time.This redundant power supply mode can significantly reduce the consumption of the required consumptive material of temperature controller, meets the requirement that the temperature controller environmental protection is used, and has reduced management and the use cost in the practical application, has solved the requirement of current nation-building conservation-minded society.

3, design concept hommization.Big lcd touch formula Programmable Temperature controller is fully taken the difference of different user habits and customs all over the world into account, in temperature control, realized degrees Fahrenheit with degree centigrade freely switch, and the user can dispose multiple adjusting parameter according to self wish, carry out real-time monitoring through hand-written touch input programming information, make temperature be in the user all the time and feel best state, be difficult to real realization hommization control in actual applications thereby overcome existing temperature controller.

4, applied widely.Big lcd touch formula Programmable Temperature controller has been realized the complexity control that multiple goal is regulated, and can be used for controlling the two wires and heats/freeze, three-wire system heat/refrigeration, four-wire system heat/refrigeration, five-wire system heat/refrigeration, system such as two-stage heats and freeze that mixing is controlled, five line heat pumps that three line district heating systems of valve control, nothing assist four line heat pumps of heat-production functions to heat, have auxiliary heat-production functions heat; Can finish the isoparametric complicated program control of temperature/fan/return difference/ventilation/maintenance/pattern/various time periods; Can control in real time the multiple object of heating such as rock gas, fuel oil, electrothermal furnace, central air conditioner, hot water or steam, make the adjustment of the most suitable user's environment for use.

5, perfect in shape and function, big lcd touch formula Programmable Temperature controller can be realized not needing online trouble shooting to switch in working order and between the detected state under the situation of continuous working except possessing above-mentioned various programming Control function.

6, circuit design is simply complete, and is with low cost.Big lcd touch formula Programmable Temperature controller adopts the minimum circuit principle of design, uses common electronic devices and components in a large number in the circuit design, has fundamentally dropped to the general expenses of controller minimum.

7, antijamming capability is strong, the control accuracy height.Big lcd touch formula Programmable Temperature controller has carried out linearization process in a plurality of links to parameter, eliminated external disturbance controller has been regulated the influence that temperature is brought, its temperature-controlled precision can reach ± 1 °F (0.5 ℃), has realized the level and smooth control that temperature variation is regulated.

8, good looking appearance is generous, simple for structure reliable, dismounting is simple and efficient.Big lcd touch formula Programmable Temperature controller adopts giant-screen to touch demonstration control, this temperature controller does not need additionally to reserve space or the structure of sensor installation, sensor is fixed near the grid window of controller front panel, not only simplified installation and the use of temperature controller, and make the profile smoothness of entire controller lucid and lively, graceful attractive in appearance.

Description of drawings

Accompanying drawing 1 is the one-piece construction block diagram of big lcd touch formula Programmable Temperature controller of the present invention;

Accompanying drawing 2 is the control principle figure of big lcd touch formula Programmable Temperature controller of the present invention;

Accompanying drawing 3 is 24 volts of power supply electronic circuits of interchange figure of the power circuit of big lcd touch formula Programmable Temperature controller of the present invention;

Accompanying drawing 4 is the battery power electronic circuit figure of the power circuit of big lcd touch formula Programmable Temperature controller of the present invention;

Accompanying drawing 5 is the MCU main control circuit figure of big lcd touch formula Programmable Temperature controller of the present invention;

Accompanying drawing 6 is the crystal oscillating circuit figure of big lcd touch formula Programmable Temperature controller of the present invention;

Accompanying drawing 7 is the temperature sensing circuit figure of big lcd touch formula Programmable Temperature controller of the present invention;

Accompanying drawing 8 is the control circuit figure of touch-screen, liquid crystal display and the backlight screen of big lcd touch formula Programmable Temperature controller of the present invention;

Accompanying drawing 9 is Menu key and the programming key electronic circuit figure of the key circuit of big lcd touch formula Programmable Temperature controller of the present invention;

Accompanying drawing 10 is the reset key electronic circuit figure of the key circuit of big lcd touch formula Programmable Temperature controller of the present invention;

Accompanying drawing 11 is stirred key electronic circuit figure for the function of the key circuit of big lcd touch formula Programmable Temperature controller of the present invention;

Accompanying drawing 12 is the connecting circuit figure of two circuit boards up and down of big lcd touch formula Programmable Temperature controller of the present invention;

Accompanying drawing 13 is the control output interface circuit figure of big lcd touch formula Programmable Temperature controller of the present invention;

Accompanying drawing 14 is the buzzer alarm circuit figure of big lcd touch formula Programmable Temperature controller of the present invention;

Accompanying drawing 15 is the storage of subscriber data circuit diagram of big lcd touch formula Programmable Temperature controller of the present invention.

Embodiment

Providing a most preferred embodiment below in conjunction with accompanying drawing is further described big lcd touch formula Programmable Temperature controller of the present invention.

A kind of big lcd touch formula Programmable Temperature controller of the present invention, its one-piece construction block diagram as shown in Figure 1, the hardware circuit of temperature controller adopts the form of standard special IC to design, its hardware circuit mainly contains by exchanging the system power supply circuit that 24 volts of power supply electronic circuits and battery power electronic circuit are formed, the MCU main control circuit, crystal oscillating circuit, temperature sensing circuit, by the touch-screen electronic circuit, people-machine display circuit that liquid crystal display electronic circuit and backlight screen electronic circuit are formed, stir the key circuit that the key electronic circuit is formed by three button key electronic circuits and two, the control output interface circuit, buzzer alarm circuit, the storage of subscriber data circuit, and the connecting circuit etc. of two circuit boards partly constitutes up and down.

A kind of big lcd touch formula Programmable Temperature controller of the present invention, its control principle as shown in Figure 2.

After big lcd touch formula Programmable Temperature controller brings into operation, can carry out the initialization of each several part hardware earlier, guarantee that can both operate as normal (there be any failure phenomenon in each circuit module as if controller in the controller, then provide failure code information, and be responsible for alarm by warning circuit), and the initialization state of automatic configuration system.After the controller initialization, if the user programmes the associated adjustment parameter is not set, temperature controller carries out work according to default setting so; If the user is according to the parameters of self wish programmed configurations controller, temperature controller will preferentially carry out work according to the parameter that arranges so.The user adopts the real-time status of people-machine display circuit management temperature controller, changes the control parameter at any time through key circuit and people-machine display circuit, thereby forms the control of an interior closed loop.MCU main control circuit output steering order instructs the control output interface circuit to regulate controlled device, the regulating and controlling temperature that output is actual.And temperature sensing circuit uses sensor to gather the actual temperature value of current environment, finish processing such as a series of sampling maintenance, comparison, storage by transferring to the MCU main control circuit after the A/D conversion again, real-time fiducial value according to current actual temperature and target temperature, it is temperature error values, carry out corresponding closed-loop control and regulate, make actual temperature remain near the target temperature.

A kind of big lcd touch formula Programmable Temperature controller of the present invention, its power circuit adopts the redundant cold standby mode of two electronic circuits to power to system, that is: exchange 24V (C line) power supply electronic circuit and battery power electronic circuit, like this She Ji purpose one be can the raising system reliability of power supply, the 2nd, can reduce controller to battery consumption, reduce the cost of use of controller.User's use for convenience, when interchange 24V power supply is unavailable, system will use the battery power power supply; Can use in case exchange the 24V power supply, then system will automatically switch and use interchange 24V power supply; If but the two time spent all, system can preferentially use and exchange the power supply of 24V power supply, to reduce the consumption to battery electric quantity, the use amount of saving consumptive material for the user.

As shown in Figure 3, big lcd touch formula Programmable Temperature controller can select to connect the secondary extension line (C line) of outside 24V AC transformer, controller is when effectively connecting interchange 24V external power source, and system will preferentially use interchange 24V (C line) power supply electronic circuit to finish the power supply to system.

Pass through by schottky diode D earlier from the external ac power source that the AC transformer secondary attracts ₁～D ₅, D ₈～D ₁₀, ZD ₁, capacitor C ₁～C ₁₀, resistance R ₁, R ₂, and triode Q ₁, Q ₂Rectification, filtering circuit Deng the device composition, then arrive the input end of three-terminal voltage-stabilizing chip LM2950-3.0, here select for use LM2950 as the core of mu balanced circuit, mainly be to consider from energy-conservation angle, its static working current has only 75 μ A, can certainly use other model stabilivolt to constitute mu balanced circuit, the present invention is not restricted this during specific implementation.Through exporting V by 1 pin of chip after the voltage stabilizing _OUT, by schottky diode D ₁₁With local decoupling capacitor C ₉Finish secondary filtering, to output the VCC (=V of system _CBThe constant DC voltage of)=3.0V.Simultaneously, the V that comes out from LM2950 _OUTPass through C ₁₀Secondary filtering is by schottky diode D ₁₃The VAC of output, VAC is mainly used in powering to backlight circuit.Why separately two cover supply lines design, and the one, consider from power supply " clean degree " design point of view, avoided the interference that produces mutually between the two; The 2nd, consider the aspect of simple design from power circuit, because backlight circuit is lower to the requirement of power supply, can directly draw VAC as power supply backlight.Under the situation of operate as normal, the output voltage of this controller power circuit will remain at V _{The C line}=3.0V, this moment, the battery power electronic circuit was not exported energy, made controller to use for a long time.

As shown in Figure 4, the battery power of big lcd touch formula Programmable Temperature controller only adopts two joints/group AA alkaline battery (1.5V/ joint) just can satisfy system to the demand of electric energy, but from the reliable power supply of system and the backlight circuit angle of power consumption comparatively, suggestion is used four joint (two groups) AA alkaline batteries to carry out the redundancy backup mode and is powered, to increase controller replacing interval time of battery in use.In the use of reality this is not done hard limit, the user can select flexibly according to s own situation.

The battery power electronic circuit mainly saves totally two couples of AA alkaline battery group (BT by four ₁And BT ₂, BT ₃And BT ₄), capacitor C ₉, schottky diode D ₁₂, D ₁₉, D ₁₄, D ₂₀, and resistance R ₃, R ₄And R ₅Constitute Deng device.Its concrete connected mode is: AA alkaline battery group BT ₁And RT ₂By schottky diode D ₁₂Output to the CB end, AA alkaline battery BT ₃And BT ₄By schottky diode D ₁₉Output to the CB end, the CB end connects filter capacitor C ₉Be used for filtering clutter, steady electricity supply voltage; C herein ₉The another one effect be to do holding discharge and hold C ₉Even in the electric weight preserved can be under the situation that all power supplys all disconnect, controller also can enter dormant state/program, and makes the data of MCU inside be enough to keep more than two minutes by these remaining electric weight.The power supply V of output _CB(=VCC) supplied with whole digital circuit and adc circuit.AA alkaline battery group BT ₁And BT ₂By schottky diode D ₁₄Output VAC; Equally, AA alkaline battery group BT ₃And BT ₄By schottky diode D20 output VAC, VAC provides power supply to backlight circuit; It is the operate as normal of disturbing adc circuit for fear of backlight circuit that VAC separates with VCC.

In the process of using electric battery to system's power supply, the electric quantity of power supply of electric battery can reduce gradually, until the system that can not offer with enough energy.Though single-chip microcomputer of the present invention still can be worked when being low to moderate 1.8V, but the people who in the system electric energy is had relatively high expectations-machine display circuit has surpassed the limit, especially wherein liquid crystal display electronic circuit, thereby according to wooden barrel principle (or claiming the short slab theory), here 2.6V is defined as the threshold voltage of controller operate as normal, 2.3V is defined as the twice gated service voltage of controller.

As 2.65V≤V _BATDuring≤3V, VCC=V is arranged _CB=V _BAT, system is in normal operating conditions;

As 2.3V≤V _BATDuring＜2.65V, 2.3V≤VCC＜2.65V is arranged, 2.3V≤VAC＜2.65V, this moment, backlight screen can not normally show, liquid crystal display shows the short of electricity sign, and is interrupted demonstration failure code, reminding user to replace battery;

As 1.8V≤V _BATDuring＜2.3V, 1.8V≤VCC＜2.3V is arranged, this moment, liquid crystal display can not show normally that controller enters dormant state, must change battery;

As 0V≤V _BATDuring＜1.8V, VCC＜1.8V is arranged, controller quits work.

Can reliablely and stablely move in order to ensure system, design has the battery electric quantity detecting unit in the battery power electronic circuit.AA alkaline battery group BT ₁And BT ₂By diode D ₁₇Output to resistor voltage divider network; AA alkaline battery group BT ₃And BT ₄By diode D ₁₈With resistor voltage divider network R ₄, R ₅And R ₃Output electric weight detection signal V _{BAT_OFF}Hand over the fault detection module of single-chip microcomputer to handle.If U ₁Be electric battery BT ₁And BT ₂Series voltage, U ₂Be electric battery BT ₃And BT ₄Series voltage.Resistance R is arranged ₄On voltage be

Resistance R ₅On voltage be U _R5=U ₂-U _D18(2)

Ignore diode D ₁₈On pressure drop, can get U _R5≈ U ₂(3)

Then $U_{\mathrm{BAT}\_\mathrm{OFF}}={\mathrm{<figure-callout\; id="4"\; label="U\; R"\; filenames="HSA00000395816900062.png,HSA00000395816900071.png"\; state="\{\{state\}\}">U</figure-callout>}}_R+{\mathrm{<figure-callout\; id="5"\; label="U\; R"\; filenames="HSA00000395816900062.png"\; state="\{\{state\}\}">U</figure-callout>}}_R=\frac{1}{{\mathrm{<figure-callout\; id="3"\; label="R"\; filenames="3.png,HSA00000395816900062.png"\; state="\{\{state\}\}">R</figure-callout>}}_3+{\mathrm{<figure-callout\; id="4"\; label="R"\; filenames="HSA00000395816900062.png,HSA00000395816900071.png"\; state="\{\{state\}\}">R</figure-callout>}}_4}\&times;(R_4{\mathrm{<figure-callout\; id="1"\; label="U"\; filenames="6.png,HSA00000395816900061.png"\; state="\{\{state\}\}">U</figure-callout>}}_1+R_3{U}_2)---\left(4\right)$

Get R ₃=10K Ω, R ₄=10K Ω

So $U_{\mathrm{BAT}\_\mathrm{OFF}}=\frac{1}{2}({\mathrm{<figure-callout\; id="1"\; label="U"\; filenames="6.png,HSA00000395816900061.png"\; state="\{\{state\}\}">U</figure-callout>}}_1+U_2)---\left(5\right)$

A kind of big lcd touch formula Programmable Temperature controller of the present invention, the CPU (central processing unit) of its MCU main control circuit adopts the H8/38024-RH microprocessor of Japanese Renesas company, this type single-chip microcomputer can be worked in the wide-voltage range from 1.8V to 5.5V, be particularly suitable for battery powered low energy consumption system (electric quantity of power supply successively decreases gradually with increasing service time), high performance MCU main control circuit is the prerequisite that temperature controller is realized response fast and accurate temperature control, also is the core of big lcd touch formula Programmable Temperature controller.The MCU main control circuit comprises that electric power loop module, sampling keep key modules such as module, A/D modular converter, memory module, comparison module, liquid crystal driver module, touch-screen driver module, fault detection module and debugging module.

As shown in Figure 5, the electric power loop module of MCU main control circuit is made of 1,8,11,49,50,51,52,53 pin, and wherein the pin 1,49,50,51 of single-chip microcomputer, 52 connects power supply V _CC, pin 8,11,53 ground connection.

Sampling keeps module to realize the integrality of sampled data, and temperature sensor is connected on 73 pin of single-chip microcomputer, and current ambient temperature signal is carried out the pressure sampling; Pin 71 passes through R ₁₉Connect field effect transistor T ₆, the signal sampling of control testing circuit is used for the make-and-break time of management and scheduling signals sampling constantly; The method that this temperature sensing circuit is only opened when the sampling module of MCU main control circuit need be sampled, the consumption of control system electric energy in signal sampling to greatest extent.

Mould/number conversion (A/D of MCU main control circuit, Analog to Digital converter) the built-in module unit of employing single-chip microcomputer, built-in 10 A/D modular converters have been realized the high precision conversion of sampled signal, mould/number conversion module adopts successive approximation method to produce binary data, convert sampled signal in the A/D conversion range digital quantity, and data are carried out linearization process, the data after the processing will deposit register in the sheet in.

The function of memory module is mainly finished by register in the sheet of single-chip microcomputer, be used for master control system and deposit and read various data parameters in, pin 13,14 connects SCL and the SDA end of storage of subscriber data circuit simultaneously, realize the exchanges data of memory module and storage of subscriber data circuit, this bipod is also multiplexing in E ²The communication of PROM.Data in the memory module are transferred to single-chip microcomputer and are carried out dynamic management after linearization process, and current actual temperature and target temperature are compared.

Comparison module is based on the principle of deviation control, obtains control signal by the processing to deviate, thereby realizes the accurate adjusting to temperature.Comparison module is taken a sample to reference power supply voltage by 74 pin of single-chip microcomputer, and it is connected resistance R ₂₁With diode D ₉The centre, be that the MCU main control circuit compares the benchmark of judging temperature variation.If have difference between the data in the memory module and this benchmark, then carry out corresponding adjustment according to the difference size, actual temperature is remained near the desired value; If it is there is not difference between the two, constant with regard to hold mode.

Liquid crystal driver module and touch-screen driver module are the built-in module of single-chip microcomputer, 17～48 pin of single-chip microcomputer are used for connecting the liquid crystal display electronic circuit, pin 45～48th, the common port of liquid crystal display electronic circuit, 13～44 connect each SEG end of liquid crystal display electronic circuit, and wherein 13～16 pin and I/O are multiplexing relation.The pin 54～59 of single-chip microcomputer and 77～80 is formed the rank scanning circuit, for detection of the input of touch-screen; Pin 54～59 connects touch-screen column scan circuit, and pin 77～80 is formed line-scan circuit.Pin 49,50,51 connects backlight circuit; Pin 62 connects the Enable Pin of the backlight driving chip CYT2507 in people-machine display circuit, is used for brightness and the break-make of control backlight circuit, and the control temperature controller is in the state working time of various low-power consumption and park mode, thus the energy consumption of saving controller.

Pin 72 connects the PROG pushbutton switch, and pin 75 connects the MENU pushbutton switch; Pin 72,75 is connected to the microswitch on the front plate, realizes input function in conjunction with touch- screen.Pin 2,3 connects the PUMP end of controlling output interface circuit and the FOSS end of wire jumper circuit respectively; Pin 4,5 mode selection switchs that connect in the key circuit receive refrigeration/thermal signal that the user sends.Pin 2,3,4,5, the 61 lower circuit plates by the 24V interface are connected to wire jumper circuit and key circuit, are used for detecting the parameter that the user arranges.

Fault detection module is used for the fault that timely discovery system may occur in the MCU main control circuit, and then provides the failure message warning, shortens the fault correction time of temperature controller, is the important component part of temperature controller reliability design.15 pin of single-chip microcomputer connect battery electric quantity detection signal BAT_OFF, and are when not connecting or changing battery, multiplexing in the replacing operation of real-time detection battery.Pin 63 output pulse width modulation signals (PWM, Pulse Width Modulation), the active hummer that is used for the control buzzer alarm circuit is sounded.Pin 76 connects the AC_SY signal, and the adhesive of pilot relay is used for AC 24V zero passage detection.

The debugging module of MCU main control circuit is mainly used in the on-line debugging of controller, makes things convenient for controller to use maintenance and the maintenance in later stage.Pin 12,59,60,64,65,66 back-up systems reset/move/debugging mode, and wherein 12 pin connect reset signal

59 pin connect the P95 signal, and 64 pin connect the P33 signal, and 65 pin connect the P34 signal, and 66 pin connect the P35 signal; The resetting of they and 11,60 pin construction systems, operation and debug circuit.Pin 67～70 is by 4 PNP triode (D ₆, D ₇, D ₁₅, D ₁₆) drive the set/reset winding of two magnetic latching relays, realize most important 24V actuating mechanism circuit control.

High performance H8/38024-RH single-chip microcomputer is to make controller become the basis of collection temperature detection, information translation, control output trinity intelligent temperature controller, therefore for big lcd touch formula Programmable Temperature controller, the selection of single-chip microcomputer is most important in the MCU main control circuit.

The first, greatly the design of lcd touch formula Programmable Temperature controller has the operational mode of park mode and multiple low-power consumption, wider range of H8/38024-RH single-chip microcomputer operating voltage, and the operating voltage that is low to moderate 1.8 volts can be supported low-power consumption and super low-power consumption mode of operation, is equipped with capacitor C ₉And C ₁₀Constitute the electric power loop module of single-chip microcomputer, though the system that can guarantee under the situation of outage, single-chip microcomputer still can enter dormant state/program from duty arbitrarily, meets the designing requirement that battery supply set " green " is used fully.

The second, the H8/38024-RH single-chip microcomputer can provide accurate time clock for system, and it can support 32.768KHz RTC master clock source and the secondary two kinds of pulses in clock source of 4MHz, satisfies system to the harsh requirement of time clock.

Three, the H8/38024-RH single-chip microcomputer has high durable Flash/RAM storage unit, and wherein the RAM data space of the Flash flash memory of 32KB and 1KB can satisfy the needs that controller is stored data parameters just.Memory module is used the built-in flash cell of single-chip microcomputer, and data are kept among the RAM, do not adopt E ²The storer of PROM makes controller in the restriction that needn't be subjected to erasing and writing life aspect the data storage again, we can say the serviceable life that has prolonged product from another point of view.

The 4th, most A/D transfer processes are often very responsive to electrical noise, this inherent defect that exists in the A/D conversion, any noise that transfer process is occurred all can be involved in the sampled signal of gained, cause the data that are transformed into to lose credibility, cause all needing generally speaking sampled signal is calibrated, but increase the reliability that calibration circuit not only can reduce entire system, and increased the design complexities of system, strengthen and make, assembling and labour cost, and select for use the H8/38024-RH single-chip microcomputer with integrated A/D converter just can overcome this problem preferably.

Five, the electrochemical capacitor C of the built-in memory module of H8/38024-RH single-chip microcomputer and cheapness ₉Combination, and be aided with the storage of subscriber data circuit, can be under-supply at battery electric quantity, under power circuit fault or any situation that causes the unexpected power down of power supply, the supplemental characteristic that the user is disposed continues to keep not losing in two minutes at least, the time that enough is used for battery altering or repairs the power circuit fault is provided, avoid allowing the user import the trouble of program parameters again, embodied the basic concept of this controller human oriented design.In addition, also save the higher nonvolatile memory of price, thereby reduced the cost of product.

Six, modern integrated circuits is complicated day by day, and reliability is Circuits System most important index request except function.Big lcd touch formula Programmable Temperature controller adopts touch-screen+liquid crystal board+backlight as the window of man-machine interaction, and liquid crystal display and touch control all need the driving circuit driving to use, the configuration liquid crystal display drive circuit not only will take this rare single-chip microcomputer pin resource separately in system, and increased the complexity of system, greatly increase cost of products in addition, but adopted the H8/38024-RH single-chip microcomputer with integrated liquid crystal driver module and touch-screen driver module then to solve this problem rightly.The H8/38024-RH single-chip microcomputer is powerful, integrated level is high, and single-chip microcomputer inside is integrated with 32 * 4 sections lcd drive chip, can directly drive liquid crystal display and backlight screen, has realized that comparatively economically people-machine shows control.

As shown in Figure 6, a kind of big lcd touch formula Programmable Temperature controller of the present invention, its crystal oscillating circuit is the system clock source (SCS of temperature controller entire circuit system, System Clock Selection), it provides a unified time clock for MCU main control circuit and peripheral circuit thereof, by resistance R ₂₉, R ₃₀, capacitor C ₁₁～C ₁₄Form with devices such as high frequency crystal oscillator Y1, Y2, connect and compose crystal oscillating circuit with 6,7,9,10 pins of single-chip microcomputer.Crystal oscillating circuit is divided into 4MHz major clock electronic circuit and 32.768KHz RTC clock source electronic circuit (secondary clock circuit) two parts, and wherein 4MHz major clock electronic circuit is by R ₃₀, C ₁₄, C ₁₃Ceramic resonators Y with built-in capacitance ₂Deng composition, 32768Hz clock source electronic circuit is by R ₂₉, C ₁₁, C ₁₂With wristwatch crystal Y ₁Deng composition.

As shown in Figure 7, a kind of big lcd touch formula Programmable Temperature controller of the present invention, its temperature sensing circuit is used for the current temperature value of the big lcd touch formula Programmable Temperature controller surrounding environment of monitoring, and temperature sensing circuit has been realized the high-precision temperature sampling of sensor strip switch control.Power supply V _CCBy P-channel field-effect transistor (PEFT) pipe T ₆Be applied to by R ₁₈With the resistor ladder upper end that RT1 constitutes, field effect transistor T ₆Be the electronic switch in the temperature sensing circuit, its break-make and make-and-break time all are subjected to management and the scheduling of MCU main control circuit, T ₆Conducting resistance have only 0.15 Ω, can effectively reduce and introduce the error that the resistor ladder circuit brings, the MCU main control circuit is by control T ₆Break-make, realize the measurement of temperature signal to external world of control temperature sensing circuit.If ambient temperature changes, the resistance of thermistor RT1 just produces a variable quantity thereupon, pass through the pressure of sampling bleeder circuit again, convert the variation delta T of ambient temperature the voltage variety Δ U of thermistor to, voltage variety Δ U sends into the built-in mould of single-chip microcomputer/number conversion module and changes after keeping.

Sensor in the temperature sensing circuit is selected the NTC thermistor of glass-encapsulated for use, and (the thermosensitive resistance measurement temperature usually shows as has hysteresis quality for TH, Thermistor) RT1, and this characteristic can be described with the mathematical model (6) of single order link.Because there be to a certain extent non-linear in the resistance-temperature characteristics of thermistor, influenced the measuring accuracy of thermistor, this just need carry out the comprehensive linearization process of software and hardware to the temperature survey of thermistor.

y＝1-e ^αx (6)

In the formula: the time parameter of α-inertial element, demarcate value according to reality.

In order to improve the temperature-controlled precision of system, the algorithm design of software need be made linearization process, and software algorithm design ultimate principle can calculate the linearization corresponding relation of thermistor resistance and temperature according to formula (7).This formula is the conversion method of thermistor resistance and temperature, and by formula (7) and table 1 as can be known, NTC thermistor resistance and temperature are inversely proportional to, and the resistance of the more high then thermistor of temperature is more low, and output voltage is also more little; Otherwise the resistance of the more low then thermistor of temperature is more high, and output voltage is also more big.

$R_t={\mathrm{<figure-callout\; id="0"\; label="R\; t"\; filenames="7.png,HSA00000395816900062.png"\; state="\{\{state\}\}">R</figure-callout>}}_t\&times;\exp \{B\&times;(\frac{1}{T_t}-\frac{1}{T_{t0}})\}={\mathrm{<figure-callout\; id="0"\; label="R\; t"\; filenames="7.png,HSA00000395816900062.png"\; state="\{\{state\}\}">R</figure-callout>}}_t\&times;\exp \{B\&times;(\frac{1}{(t_t+273.15)}-\frac{1}{({\mathrm{<figure-callout\; id="0"\; label="t\; t"\; filenames="7.png,HSA00000395816900062.png"\; state="\{\{state\}\}">t</figure-callout>}}_t+273.15)})\}---\left(7\right)$

In the formula: T _T0=t ₀+ 273.15 (t wherein ₀=25 ℃ is the benchmark room temperature), unit is K.

T _t=t _t+ 273.15 (wherein t is actual room temperature, unit be ℃), unit is K.

R _T0-environment t ₀Nominal resistance in the time of=25 ℃, unit are k Ω; Be 10k Ω as can be known from Table 1.

Relation between table 1 temperature and the thermistor resistance

Temperature T (℃)	0	5	10	15	20	25	30	35	40
										Resistance R (k Ω)	32.654	25.396	19.903	15.714	12.493	10	8.056	6.530	5.327

R _t-environment t _tResistance during=t, unit is k Ω.

The material constant of B-NTC thermistor, it is a constant of reflection negative temperature coefficient thermistor sensitivity, unit is ℃; The B value is more big, and the heat sensitivity of thermal resistor is more high, and its formula is shown in (8), and the thermistor material constant that calculating can this temperature controller be used is 3915.5K, as shown in Equation (9).

$B={(\frac{1}{T_t}-\frac{1}{T_{t0}})}^{-1}\&times;\ln \frac{R_t}{R_{\mathrm{<figure-callout\; id="0"\; label="t"\; filenames="7.png,HSA00000395816900062.png"\; state="\{\{state\}\}">t</figure-callout>}0}}=\frac{T_t\&times;T_{t0}}{T_{t0}-T_t}\&times;\ln \frac{R_t}{R_{t0}}---\left(8\right)$

In the time of t=35 ℃, T is arranged _t=T _{35 ℃}=35+273.15K, T _T0=T _{25 ℃}=25+273.15K; As shown in Table 1, R _t=R _{35 ℃}=6.530k Ω, R _T0=R _{25 ℃}=10.000k Ω; Then $B=\frac{(35+273.15)\&times;(25+273.15)}{298.15-308.15}\&times;\ln \frac{6.530}{10.000}$

$\&ap;3915.5$ (9)

For the measured temperature that makes controller more accurate, except will be the enterprising line linearity processing of software algorithm, also to further carry out the linearization process of hardware to circuit, overcome the error that causes because of individual components and parts difference, with canonical measure equipment this value is demarcated, just can during normal use revise cell voltage with this value and change the temperature sampling error that causes.Secondly, room temperature is to be in metastable state in the ordinary course of things, and its fluctuation range is little, and thermistor all can remain under the minimum power as a rule, and this makes the changes delta RT1 of itself resistance just have certain linearity.

In addition, improve the accuracy of temperature detection, need also to guarantee that the Current Temperatures that records and the digital quantity that is transformed in the single-chip microcomputer are linear corresponding relation.Resistance R ₂₁With diode D ₉The reference circuit that is composed in series is by D ₉Volt-ampere of characteristic diode a relatively stable pressure drop U is provided _CTAD(=U _D9≈ 0.7V), definition U _CTADBe the reference voltage that compares to determine.The use of battery can cause supply voltage that a decline process is arranged, and this reference voltage is then corresponding on the ADC measurement result to show as a value that increases gradually.The linearizing method of these temperature sensing circuits is not only simple and reliable, and response speed is fast, can realize the closed-loop control of temperature preferably.

∵ $U_{\mathrm{RTAD}}={\mathrm{<figure-callout\; id="1"\; label="U\; RT"\; filenames="6.png,HSA00000395816900061.png"\; state="\{\{state\}\}">U</figure-callout>}}_{\mathrm{RT}}=\mathrm{VCC}\&times;\frac{\mathrm{RT}1}{R18+\mathrm{RT}1}---\left(10\right)$

∵ again $U_{R18}=\frac{\mathrm{VCC}-U_{T6}}{R18+\mathrm{<figure-callout\; id="1"\; label="RT"\; filenames="6.png,HSA00000395816900061.png"\; state="\{\{state\}\}">RT</figure-callout>}1}\&times;R18---\left(11\right)$

Ignore the pressure drop on the field effect transistor T6, can get

U _RTAD＝U _C5＝U _RT1＝VCC-U _T6-U _R18 (12)

When temperature changed, thermistor RT1 is corresponding to produce a resistance change Δ RT1, established the resistance of RT1 ' after for thermistor RT1 variation.Because electric capacity has the characteristic of handing over every direct transferring, so capacitor C ₅Smoothly RT1 goes up the pressure drop Δ U that corresponding temperature changes, and makes its retention wire sexual intercourse of trying one's best, but not the sudden change of discrete type relation.

∴ $U_{\mathrm{RTAD}}={\mathrm{<figure-callout\; id="1"\; label="U\; RT"\; filenames="6.png,HSA00000395816900061.png"\; state="\{\{state\}\}">U</figure-callout>}}_{\mathrm{RT}}={\mathrm{<figure-callout\; id="5"\; label="U\; C"\; filenames="HSA00000395816900062.png"\; state="\{\{state\}\}">U</figure-callout>}}_C=\mathrm{VCC}\&times;\frac{\mathrm{<figure-callout\; id="1"\; label="RT"\; filenames="6.png,HSA00000395816900061.png"\; state="\{\{state\}\}">RT</figure-callout>}1+\mathrm{\&Delta;RT}1}{R18+\mathrm{<figure-callout\; id="1"\; label="RT"\; filenames="6.png,HSA00000395816900061.png"\; state="\{\{state\}\}">RT</figure-callout>}1+\mathrm{\&Delta;RT}1}---\left(13\right)$

∴ $\mathrm{\&Delta;U}=\frac{\mathrm{VCC}\&times;\mathrm{\&Delta;RT}1}{R18+\mathrm{<figure-callout\; id="1"\; label="RT"\; filenames="6.png,HSA00000395816900061.png"\; state="\{\{state\}\}">RT</figure-callout>}1+\mathrm{\&Delta;RT}1}---\left(14\right)$

As shown in Figure 8, a kind of big lcd touch formula Programmable Temperature controller of the present invention, its people-machine display circuit is made of touch-screen electronic circuit, liquid crystal display electronic circuit, backlight screen electronic circuit three parts, mainly finish the user adjusts parameter or real time monitoring temperature control state according to wish function, according to the Ta Siding algorithm, its transport function can be represented with formula (15).

$C\left(x\right)=k\frac{A\left(x\right)}{B\left(x\right)}{e}^{-\mathrm{\&tau;x}}---\left(15\right)$

In the formula: the k-correction factor;

A (x), B (x)-its description form is relevant polynomial expressions such as the type, model of the controlled temperature programmed parameter that arranges with the user;

The x-Laplace operator;

τ-time delay.

Touch-screen electronic circuit (Touch) supports felt pen, finger even nail to operate, and the characteristics of high s/n ratio can make it reach the accuracy of identification of regulation in various noisy electromagnetic environments.The Petting Area of 4 * 5 scopes can be caught and identify to this touch-screen, as shown in table 2, if felt pen or finger drop on the touch-screen, then this touch-screen obtains corresponding click signal, and the corresponding relation that system just can provide according to truth table 2 is determined the coordinate parameters in clicked zone, thereby reach the purpose of addressing on touch-screen, the touch-screen electronic circuit is found out corresponding signal data rapidly, provides position signalling to the MCU main control circuit subsequently, so that controller is handled accordingly and controlled.

Table 2 touch screen signal truth table

PIN	3	4	5	6	7	8
							1	-	B	F	H	J	L
2	-	A	E	G	I	K
							9	-	C	Q	-	O	M
10	-	D	-	-	P	N

Liquid crystal display electronic circuit (LCD, Liquid Crystal Display) mainly is made of liquid crystal display drive circuit and LCDs two parts.Big lcd touch formula Programmable Temperature controller is installed on the indoor wall on 1.5 meters on distance ground, and (128 segmentation LCDs of viewing area 118 * 68mm), the display screen truth table is as shown in table 3 therefore to adopt 12 view directions 121 * 77mm.Why adopt this design proposal that three kinds of reasons are arranged, the one, because the liquid crystal panel of field formula is conducive to satisfy product requirement attractive in appearance; The 2nd, because the liquid crystal display of field formula is conducive to reduce mass production cost; The 3rd, because the liquid crystal panel of field formula is conducive to reduce the power consumption of liquid crystal display, satisfy the designing requirement of environmental protection; The 4th, because this liquid crystal display can normally use, can meet temperature controller to the Design in Reliability index request in the environment of-20～60 ℃ of storages and-10～50 ℃.

The signal truth table of table 3 liquid crystal display

Backlight screen electronic circuit (backlight) is by white constant-current driven chip CYT2507 backlight, inductance L ₁, diode D ₆～D ₈, resistance R ₂₀, capacitor C ₃～C ₄Form Deng components and parts.Backlight screen place liquid crystal display under, this backlight screen can adapt to the designing requirement in-20～70 ℃ of storages and-10～60 ℃ of work.The real-time condition of utilizing backlight screen can make things convenient for the user to observe controller when light is more weak can be closelyed follow the development in science and technology trend again, is conducive to product requirement attractive in appearance.

The core that white constant-current driven chip CYT2507 backlight is the backlight screen electronic circuit, this driving chip is to be exclusively used in a kind of constant current DC/DC boost converter that drives white light LEDs, only use a pair of dry cell just can drive the LED lamp of four series connection, adopt series system to provide equal electric current for the LED lamp, can guarantee that every LED lamp all has under the prerequisite of equilibrium brightness, avoid additionally increasing necessity of steady resistance, thereby reduced the design complexities of backlight screen circuit, improved the reliability of circuit; The switch oscillation frequency of CYT2507 is 1.0MHz, and output capacitance can be used very little 1uF electric capacity, can save the space greatly and reduce cost of products; In addition, be low to moderate the feedback voltage of 95mV, reduced the power that consumes on the current setting resistor, also prolonged the service time of battery-powered mode, meet the designing requirement of Product Green environmental protection, improved the global reliability of system.

Shown in accompanying drawing 9,10,11, a kind of big lcd touch formula Programmable Temperature controller of the present invention, its key circuit divides three button key electronic circuits and two to stir the key electronic circuit, be master menu button (MENU) electronic circuit, user program button (PROG) electronic circuit, system's reset key (RESET) electronic circuit, and function is stirred the key electronic circuit and fan selects to stir the key electronic circuit.

Master menu button (MENU) electronic circuit is by S ₂And R ₂₇Constitute S ₂Realize temperature control archives editting function; User program button (PROG) electronic circuit is by S ₃And R ₂₈Constitute S ₃Realize the menu interface handoff functionality, referring to shown in Figure 9.

System's reset key (RESET) electronic circuit is mainly by resistance R ₈, capacitor C ₂Constitute with button, referring to shown in Figure 10.Reset key can make system operate again when deviation takes place in operation, when pressing the RESET key, and output TP3 signal.

Function is stirred the key of stirring that the key electronic circuit adopts 4P3T, and system is in which kind of state under three kinds of states of HEAT/OFF/COOL, stirs key by function and selects to realize, referring to shown in Figure 11.When mode selection switch placed COOL or HEAT position, system works was under the pattern of correspondence, and the COOL on the liquid crystal display or HEAT sign are lighted simultaneously.Press the homepage icon at other interface, then enter the COOL/HEAT state interface; If refrigerating/heating work is carried out, then Dui Ying COOL or HEAT sign can flicker.At this moment, the parameter under the stopped status interface can be set, transient target temperature or program control target temperature can also be set, and can utilize the HOLD function to make transient target temperature prioritised in program control target temperature.When mode selection switch placed the OFF position, refrigeration, heat-production functions did not all start.Then enter the stopped status interface at other interface by the homepage icon.Liquid crystal display only shows current indoor actual temperature, and the user can arrange current week, time, temperature demonstration demarcation, and system, Celsius/Fahrenheit temperature showed in changeable 12/24 hour.

Fan is selected to stir the key of stirring that key adopts 1P2T, and referring to shown in Figure 11, fan selects to stir the operator scheme that key can arrange fan, fan control is realized the selection of AUTO/ON.Automatic mode (AUTO) or continuous mode (ON).When selecting automatic mode (AUTO), fan will carry out work according to the preset parameters pattern; When selecting continuous mode (ON), then fan is worked always.

As shown in Figure 12, a kind of big lcd touch formula Programmable Temperature controller of the present invention, two circuit boards are responsible for different functions respectively about it, and connecting circuit is mainly by diode D ₁～D ₅, triode T ₂～T ₅And resistance R ₁₀～R ₁₂Etc. formation.The realization of temperature controller regulatory function need be cooperatively interacted by digital circuit board and two circuit boards of 24 volts of plates and finish, two circuit board connecting circuit adopt the winding displacement of band edge to flexibly connect, this flexibly connecting with being rigidly connected of board to board connector between the circuit board compared, anti-vibration and the impact property of system have not only been increased, promoted the reliability of system, and flexibly connect when keeping electrical communication and can test the circuit on two circuit board opposite faces, make debugging and the maintenance in later stage of temperature controller convenient flexibly, therefore controller has also had good testability and maintainability.

Two circuit boards of the big lcd touch formula Programmable Temperature controller separately purpose one of design are from electromagnetic interference (EMI)/compatible design point of view, with the 3VDC circuit board of 24VAC circuit board and digital circuit separately, avoid the interference problem that produces each other; The 2nd, from the angle of circuit arrangement simplified design, reduce the difficulty of circuit board wiring, reduce the complexity of circuit structure design; The 3rd, from the angle of product global design, so design can be dwindled the volume of product, and the product geometric shape is more become rationally, takes full advantage of space depth installation product in the body of wall.

As shown in Figure 13, a kind of big lcd touch formula Programmable Temperature controller of the present invention, its control output interface circuit is by electric capacity V ₁～V ₆, wire jumper P ₁～P ₅, diode D ₆～D ₇, D ₁₅～D ₁₆, main components and parts such as magnetic holding signal relay MRLY1 and MRLY2 form.The control output interface circuit is temperature controller and the part that load equipment directly links to each other, and is responsible for load is exported in the control information of temperature controller, and loading interfaces has 11 ports, and is as shown in table 4.

The definition of the big liquid crystal touch formula Programmable Temperature control unit interface of table 4

Annotate: 1.R _CWith R _HDo not link to each other mutually.2. in heat pump, if cable B and O exist, cable O is connected to terminal O, cable B can not be connected with terminal B, and cable B should be connected to terminal C, otherwise can damage outside 24VAC power supply.

In general, can not directly drive and control load from the digital signal of MCU main control circuit output, must design control output interface circuit as intergrade, convert the digital controlled signal of MCU main control circuit output to can directly drive load signal, guarantee to realize every control function of temperature controller.Solid-state relay has the advantages that directly drive large current load with small control signal, and here because the electric current of load is bigger, so select solid-state relay can allow main control circuit only need export pulse control signal, just the break-make of energy pilot relay constantly.Be the power consumption that reduces temperature controller and the working time that prolongs product, just need to adopt the twin coil magnetic holding signal relay of super low-power consumption as the core of loading interfaces circuit, when 67～70 pin output pulse signals of single-chip microcomputer, corresponding actions can be done in the contact of magnetic latching relay, and after pulse signal disappears, also can be retained in contact position, fully satisfied the control requirement of temperature controller.Magnetic latching relay MRLY1 and MRLY2 are low to moderate the 2.25VDC closure/release voltage of (wherein DC represents direct supply), and the super low-power consumption of 200mW, make big lcd touch formula Programmable Temperature controller can meet the designing requirement of green energy conservation, and reach 1 * 10 ⁸The folding number of times make temperature controller satisfy the designing requirement of needs frequent movements again.

As shown in Figure 14, a kind of big lcd touch formula Programmable Temperature controller of the present invention, its buzzer alarm circuit is by resistance R ₇, R ₁₃, R ₁₄, triode T ₁, and hummer U1 forms.Alarm control signal BUZR is by the D/A modular converter (D/A of MCU main control circuit, Digital to Analog converter) output, the digital controlled signal BUZR of main control circuit output, can not the direct controlling and driving hummer, so alarm control signal must amplify through related circuit earlier.When control signal BUZR output high level, triode T ₁Conducting, then power supply V _CCThrough resistance R ₇, loudspeaker U1, triode T ₁Constitute the loop to GND, make loudspeaker U1 send alerting tone.When control signal BUZR is low level, triode T then ₁End, loudspeaker U1 does not work.

As shown in Figure 15, a kind of big lcd touch formula Programmable Temperature controller of the present invention, its storage of subscriber data circuit is by storer AT24C02 chip, capacitor C ₁, resistance R ₂And R ₃Constitute.The two-way communication that the storage of subscriber data circuit adopts bus rule to connect is from the parameter data signal TP1 of MCU main control circuit output, through a pull-up resistor R ₂The SCL data input pin of back connected storage AT24C02 is finished the storage of data by storer.The AT24C02 storer is the E of electric erasable programming ²PROM chip, pin SCL are used for connecting user's setup parameter input of TP1; Pin SDA is used for serial and exports saved various supplemental characteristic; Address input end A ₀, A ₁, A ₂With the direct ground connection of GND; With pin WP ground connection, can make E ²The PROM chip can carry out read-write operation.The supplemental characteristic that is stored in the storage chip can be by SDA port serial output, user's setup parameter data TP2 returns the MCU main control circuit, thereby realize the data interaction between storage of subscriber data circuit and the MCU main control circuit, by the management of MCU main control circuit, the serial clock of storer and the clock module of system are consistent in the transmission of its data (receiving/send).

Above-described embodiment, the present invention embodiment a kind of more preferably just, the common variation that those skilled in the art carries out in the technical solution of the present invention scope and replacing all should be included in protection scope of the present invention.

Claims (10)

1. one kind big lcd touch formula Programmable Temperature controller, comprise the MCU main control circuit, described MCU main control circuit is connected with power circuit and key circuit, it is characterized in that, described MCU main control circuit also is connected with crystal oscillating circuit and people-machine display circuit, and pass through the connecting circuit connection control output interface circuit of two circuit boards up and down, described connecting circuit adopts the winding displacement of band edge to flexibly connect;

Wherein, described MCU main control circuit comprises that electric power loop module, sampling keep module, A/D modular converter, memory module, comparison module, liquid crystal driver module, touch-screen driver module, fault detection module and debugging module;

Wherein, described sampling keeps module by connecting temperature sensor and the field effect transistor of single-chip microcomputer, and the signal sampling of control testing circuit is used for the moment of management and scheduling signals sampling constantly;

Wherein, described comparison module is based on the principle of deviation control, obtains control signal by the processing to deviate, thereby realizes the accurate adjusting to temperature;

Wherein, described fault detection module is used for the fault that timely discovery system may occur, and then provides the failure message warning, shortens the fault correction time of temperature controller;

Wherein, described debugging module is used for the on-line debugging of controller;

After the described temperature controller initialization, the user adopts the real-time status of people-machine display circuit management temperature controller, changes the control parameter at any time through key circuit and people-machine display circuit, thereby forms the control of an interior closed loop; MCU main control circuit output steering order instructs the control output interface circuit to regulate controlled device, the regulating and controlling temperature that output is actual; And temperature sensing circuit uses sensor to gather the actual temperature value of current environment, finish processing such as a series of sampling maintenance, comparison, storage by transferring to the MCU main control circuit after the A/D conversion again, real-time fiducial value according to current actual temperature and target temperature, carry out corresponding closed-loop control and regulate, make actual temperature remain near the target temperature.

2. a kind of big lcd touch formula Programmable Temperature controller according to claim 1 is characterized in that described MCU main control circuit also is connected with temperature sensing circuit.

3. a kind of big lcd touch formula Programmable Temperature controller according to claim 2 is characterized in that described MCU main control circuit also is connected with the storage of subscriber data circuit.

4. a kind of big lcd touch formula Programmable Temperature controller according to claim 3 is characterized in that described MCU main control circuit also is connected with the wire jumper circuit.

5. a kind of big lcd touch formula Programmable Temperature controller according to claim 4 is characterized in that described MCU main control circuit also is connected with buzzer alarm circuit.

6. a kind of big lcd touch formula Programmable Temperature controller according to claim 1 is characterized in that wherein crystal oscillating circuit is made up of major clock electronic circuit and secondary clock electronic circuit.

7. a kind of big lcd touch formula Programmable Temperature controller according to claim 2 is characterized in that wherein temperature sensing circuit is connected with corresponding gauge tap.

8. according to any described a kind of big lcd touch formula Programmable Temperature controller of claim 1-5, it is characterized in that wherein power circuit is formed by exchanging 24 volts of power supply electronic circuits and battery power electronic circuit.

9. according to any described a kind of big lcd touch formula Programmable Temperature controller of claim 1-5, it is characterized in that wherein people-machine display circuit is made up of touch-screen electronic circuit, liquid crystal display electronic circuit and backlight screen electronic circuit.

10. according to any described a kind of big lcd touch formula Programmable Temperature controller of claim 1-5, it is characterized in that wherein key circuit is stirred the key electronic circuit by three button key electronic circuits and two and formed.

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