CN2221757Y - Computer controller of refrigerator - Google Patents
Computer controller of refrigerator Download PDFInfo
- Publication number
- CN2221757Y CN2221757Y CN 95200071 CN95200071U CN2221757Y CN 2221757 Y CN2221757 Y CN 2221757Y CN 95200071 CN95200071 CN 95200071 CN 95200071 U CN95200071 U CN 95200071U CN 2221757 Y CN2221757 Y CN 2221757Y
- Authority
- CN
- China
- Prior art keywords
- circuit
- chip microcomputer
- temperature
- refrigerator
- operational amplifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
The utility model relates to a computer controller of a refrigerator, comprising a controller panel and a controller circuit. The controller circuit comprises a single chip computer, detection circuits, an executing drive circuit which is used for driving the pipelines of a refrigerator, a key scanning and displaying circuit which is used for setting and displaying corresponding temperature, wherein, the detection circuits are used for detecting the temperature, overvoltage, undervoltage, defrosting, overcurrent, instantaneous power failure and other states. The single chip computer reads the state of each detection circuit through input port wires; after the judgment of the program of the single chip computer, functions of temperature control, defrosting, etc. are realized through the executing drive circuit. The controller panel is provided with a display screen, state indicating lamps and three keys used for setting the temperature. The utility model solves a problem that an existing refrigerator runs short of intelligent control.
Description
The utility model relates to a kind of refrigerator computer controller, particularly a kind of singlechip controller that is applied to household electric refrigerator.
Existing refrigerator control can be divided into mechanical temperature control; electron temperature-control and computer control temperature three major types are other; wherein mechanical temperature control can only qualitatively preset several grades of temperature; function is extremely simple; temperature-controlled precision is low; electron temperature-control can accomplish to establish continuously gentle temperature control; temperature-controlled precision also increases; corresponding some overvoltage/undervoltages and the delay protection function of having increased; but temperature control method can not change flexibly with user's requirement, can not select power save mode, computer control temperature to have superior disposal ability automatically; refrigerator is moved under programme-control, and temperature control method can change flexibly with customer requirements.Present domestic computer refrigerator controller, as the patent No. is 93207968.7 disclosed " micro computer refrigerator controllers ", shown in Figure 1A, it comprises single-chip microcomputer, memory circuit 5 and temperature sensing circuit 2, the testing circuit 3 that opens the door, overvoltage/undervoltage testing circuit 4, watchdog circuit 6, execution drive circuit 7, display circuit 8 and button 9; Following several shortcomings are arranged on its circuit function:
(1), consider compatible design on the hardware, only be applicable to two refrigerators, can not adapt to the needs of refrigerator to the three-door refrigerator expansion;
(2), open the door to detect and used a photo resistance, can only detect the enabling signal of an icehouse, and there is the problem of poor reliability in photo resistance;
(3), application software regularly starts frost removal and defrosts, and does like this to be unfavorable for energy-conservationly, is unfavorable for that also refrigerator reliably freezes;
(4), in the processing to overvoltage/undervoltage, adopted to detect the method that signal is a close compressor, done like this and caused high frequent to start easily, influenced the life-span;
(5), do not detect the design of momentary power failure on the hardware because the compressor that general refrigerator uses each disconnect and start between, need 3 minutes to 5 minutes blanking time, otherwise, cause stall easily, damage compressor.Because software can't be judged momentary power failure and the time that powers on first; when compressor disconnects owing to momentary power failure; the software performing a programme that powers on; when need driving compressor, judgement just starts compressor; without any safeguard measure; therefore might cause compressor not have and intermittently disconnect continuously and startup, stall takes place.
The purpose of this utility model is to provide a kind of reliability height, and is compatible strong, can set up the intelligent electric refrigerator computer controller of cryogenic temperature according to instructions for use on their own.
For reaching above-mentioned purpose, the utility model is taked following measure:
Expand the testing circuit function, key scan, display circuit, executive circuit be arranged to the circuit of expandable type,
Refrigerator computer controller of the present utility model comprises controller panel and controller circuitry; Controller circuitry comprises: open the door testing circuit, an overvoltage/undervoltage testing circuit, a watchdog circuit and one of a single-chip microcomputer, a memory circuit, a temperature sensing circuit, carried out drive circuit, and it also comprises:
One defrosting testing circuit, an over-current detection circuit, an instantaneous outage detection and delay protection circuit and a key scan and display circuit;
Described single-chip microcomputer by the input port line read temperature sensing circuit, the testing circuit that opens the door, overvoltage/undervoltage testing circuit, defrosting testing circuit, over-current detection circuit and momentary power failure detects and the status data of delay protection circuit, after the program judgement that is pre-stored in described memory circuit, realize temperature control and defrosting by described execution drive circuit; Described memory circuit is by Single-chip Controlling storage Default Value and the relevant temperature through pressing key assignments; Key scanning circuit reads the temperature that is provided with of storing in the described memory circuit by the input port line of single-chip microcomputer, and described watchdog circuit is used for automatically reseting of single-chip microcomputer.
Described controller panel is provided with display screen, is used to indicate indicator lamp and three buttons that are used to set and show refrigerating chamber, refrigerating chamber, environment temperature of power supply, compressor operating and alarm condition.
Described defrosting testing circuit can comprise that one detects the thermistor and an operational amplifier of freezing chamber evaporator actuator temperature; Thermistor is connected in the positive input terminal of operational amplifier, and the negative input end of operational amplifier is connected in a comparative voltage source, and the output of operational amplifier is connected to an input port line of described single-chip microcomputer by a diode;
Described momentary power failure detects and the delay protection circuit can be on described defrosting testing circuit basis, connects a charging capacitor at the negative input end of described operational amplifier.
Described over-current detection circuit can comprise a photoelectrical coupler, an operational amplifier, a bleeder circuit, bleeder circuit is from the line voltage dividing potential drop, the gained voltage signal is through photoelectric coupler isolation and transfer a current signal to, be added to the positive input terminal of described operational amplifier, the negative input end of operational amplifier is connected in a comparative voltage source, and the output of operational amplifier is connected to an input port line of described single-chip microcomputer by a diode;
Described overvoltage/undervoltage testing circuit can comprise two bleeder circuits, two operational amplifiers that input is connected in series mutually, the benchmark high voltage signal that a described bleeder circuit is got from supply voltage Vcc, the benchmark low voltage signal that another bleeder circuit is got from supply voltage Vcc, transport to the positive and negative input of described two operational amplifiers respectively, the public input of two operational amplifiers through two resistance connect respectively+12V is to-detected the voltage signal of 15V, the output of two operational amplifiers all is connected to an input port line of single-chip microcomputer by diode.
Described execution drive circuit comprises that a drive circuit and that is used to control the compressor start and stop is used to control the drive circuit of refrigerator pipeline electromagnetic valve;
It is the integrated circuit of MC1413 that preceding one drive circuit adopts a model;
Back one drive circuit comprises 4 operational amplifiers and 4 pairs of FETs, and the FET that per 2 drain electrodes are connected is corresponding to 1 operational amplifier; The positive input terminal of each operational amplifier is connected to the delivery outlet line of single-chip microcomputer, its negative input end connects a voltage source, its output is connected to the grid of 1 pair of FET respectively through 2 diodes, two source electrodes of every pair of FET connect respectively+15V and-15V voltage, the common point that two drain electrodes of every pair of FET are connected is combined as pair of output with another to the common point that two drain electrodes of FET are connected, and each is connected to the positive and negative contact of respective electrical magnet valve to output.
Described key scan and display circuit can comprise row's resistance, drive circuit, one group of button, one group of charactron and the one group of diode that is made of integrated circuit; The position of charactron drives and the section driving is driven by the PA mouth and the PB mouth of single-chip microcomputer respectively; Key scan is finished by single-chip microcomputer PD6, PA0～PA4 and one drive circuit.
It is the single-chip microcomputer of MC6805R3 that described single-chip microcomputer can adopt model.
The utility model refrigerator computer controller has following effect:
(1), hardware is easy to expansion, owing to adopt the multiplexing and dynamic scan technology of mouthful line, under the prerequisite that does not increase single-chip processor i/o mouth line, button can be expanded to five by present three, LED light can be expanded to eight by present three, can satisfy the requirement of different manufacturers like this, carry out panel designs flexibly.Adopt four groups of isolated gate FET IRF9520 and IRF520 to drive the bistable magnetic valve, under the prerequisite that does not increase element, can expand to by two magnetic valves of present driving and drive three magnetic valves, can be used for the control of three-door refrigerator;
(2), use door switch to detect the enabling signal of two icehouses, reliability height respectively;
(3), a temperature sensor is installed on the evaporimeter of refrigerating chamber, can carry out intelligent defrosting control;
(4), the protection problem under unusual power supply situation, the utility model not only detects the overvoltage/undervoltage signal, and detects the over-current signal of directly obtaining from electrical network, takes hardware detection and software to judge the method that combines, based on over-current signal, the overvoltage signal is auxilliary.Can make compressor obtain reliably protecting, prolong the service life of compressor;
(5), designed momentary power failure on the hardware and detected and the delay protection circuit, Mi has mended the deficiency of pure software delay.
Description of drawings:
Figure 1A: the theory diagram of existing refrigerator computer controller;
Figure 1B: the theory diagram of the utility model refrigerator computer controller;
Fig. 2 A, Fig. 2 B, Fig. 2 C: the circuit diagram of refrigerator computer controller of the present utility model;
Fig. 3: the pipeline schematic diagram of the utility model refrigerator;
Fig. 4: the driving signal schematic representation of the utility model refrigerator magnetic valve;
Fig. 5: the schematic diagram of controller panel of the present utility model and design temperature;
Fig. 6: the main program flow chart of the utility model refrigerator computer controller;
Fig. 7: the utility model temperature control is handled subroutine flow chart;
Fig. 8: subroutine flow chart is handled in the utility model defrosting
Fig. 9: the utility model door opening times and time memory subroutine flow chart;
Figure 10: the utility model abnormal electrical source protection subroutine flow chart.
Reaching embodiment in conjunction with the accompanying drawings is described as follows characteristics of the present utility model:
Shown in Figure 1B, it is the theory diagram of the utility model refrigerator computer controller; Refrigerator computer controller of the present utility model comprises controller panel and controller circuitry; Controller circuitry comprises: open the door testing circuit 3, an overvoltage/undervoltage testing circuit 4, a watchdog circuit 6 and one of a single-chip microcomputer 1, a memory circuit 5, a temperature sensing circuit 2, carried out drive circuit 7, and it also comprises: defrosting testing circuit 10, an over-current detection circuit 11, one instantaneous outage detection and delay protection circuit 12 and a key scan and a display circuit 13;
Described single-chip microcomputer 1 by the input port line read temperature sensing circuit 2, the testing circuit 3 that opens the door, overvoltage/undervoltage testing circuit 4, defrosting testing circuit 10, over-current detection circuit 11 and momentary power failure detects and the state of delay protection circuit 12, after the program judgement that is pre-stored in described memory circuit, realize temperature control and defrost functions by described execution drive circuit 7; Described memory circuit 5 is by single-chip microcomputer 1 control, storage Default Value and the relevant temperature through pressing key assignments; Key scanning circuit reads the temperature that is provided with of storing in the described memory circuit 5 by the input port line of single-chip microcomputer 1, and described watchdog circuit 6 is used for automatically reseting of single-chip microcomputer 1, in order to avoid maloperation.
As shown in Figure 5, it is the schematic diagram of controller panel of the present utility model and design temperature.
Described controller panel is provided with display screen 14, is used to indicate indicator lamp 15 and three buttons 16 that are used to set and show refrigerating chamber, refrigerating chamber, environment temperature of power supply, compressor operating and alarm condition.Show among the figure that numeral 17,18,19 is respectively environment temperature, freezer temperature and temperature of refrigerating chamber.
As shown in Figure 2, it is the circuit diagram of the utility model refrigerator computer controller; Among Fig. 2 A, controller circuitry of the present utility model is a core with single-chip microcomputer 1, it is the integrated circuit of MC6805R3 that single-chip microcomputer 1 of the present utility model adopts model, it is a kind of single-chip microcomputer with good Electro Magnetic Compatibility, A/D change-over circuit wherein can carry out 4 tunnel 8 A/D translation operation, inside is provided with random access memory, the read-only storage of 3776 bytes, 8 bit timing counters, 48 parallel-by-bit interfaces of 112 bytes, its control ability is strong, adopts the internal bus mode to save external bus extended interface.
Among the figure, temperature sensing circuit 2 is by thermistor RT1, RT2, RT3, resistance R 8, R21, R9, R10, R11, R12, and capacitor C 5, C7, C8 form.Thermistor RT1, RT1, RT3 detect refrigerating chamber respectively, the temperature of refrigerating chamber and surrounding environment, by the AN0 of single-chip microcomputer MC6805R3, AN1, AN2 reads in respectively, carries out the A/D conversion, carries out computing by program, draws measurement result, carries out control corresponding.
Shown in Fig. 2 B, intelligent control method detect is adopted in defrosting, and defrosting testing circuit 10 is by thermistor R23, resistance R 20, R22, R24, R3, and amplifier N2D (LM339), diode V5, VK3, VK12, capacitor C 10 is formed.Thermistor R23 detects the temperature of freezer evaporator, and its resistance descends with temperature, during the refrigerating chamber frosting, the temperature of evaporimeter just descends, when reaching certain value, amplifier N2D upset, 13 pin output " 0 " signal of N2D, after the mouth line PD7 of single-chip microcomputer 1 reads energizing signal " 0 ", promptly carry out computing, with the output signal DISP4 of drive circuit mutually or, if draw " 1 ", then judging needs defrosting, promptly carries out defrosting and handles subprogram.This Defrost mode belongs to intelligent defrosting.
Overvoltage/undervoltage testing circuit 4 is by resistance R 3, R13, R14, R15, R16, R26, R27, R33, R34, capacitor C 9, and amplifier N2A, N2B, diode VK2, VK5, VK9, VK10 form.R15 and R16 form bleeder circuit, obtain the high signal of benchmark from VCC.R13 and R14 form bleeder circuit, obtain the benchmark low signal from VCC.4 pin of N2 and 7 pin meet the voltage division signal VOLTAG (being approximately 1.8V) from 12V to-15V respectively, it is high and benchmark is low that 5 pin and 6 pin connect benchmark respectively, when line voltage fluctuates toward eminence, VOLTAG is along with rising, and when surpassing benchmark, N2A overturns, 2 pin output " 0 " signal, after the mouth line PD7 of single-chip microcomputer 1 reads energizing signal " 0 ", promptly carry out computing, with output signal DISP1 mutually or, if draw " 1 ", it is higher then to judge line voltage, and when line voltage fluctuateed toward lower, VOLTAG was along with reduction, when being lower than benchmark, the N2B upset, 1 pin output " 0 " signal is after the mouth line PD7 of single-chip microcomputer 1 reads energizing signal " 0 ", promptly carry out computing, with output signal DISP2 mutually or, if draw " 1 ", it is on the low side then to judge line voltage.
Over-current detection circuit 11 is by diode V6, VK4, VK11, resistance R 2, R3, R18, R19, R25, R30, R31, R32, and electrochemical capacitor C6, photoelectrical coupler V7, amplifier N2C forms.R31, R30 and C6 are from the line voltage dividing potential drop, V7 keeps apart electrical network and low-pressure section, can anti-interferencely can strengthen security performance again, export the current signal of a reflection electrical network simultaneously, when electric current just often, 14 pin of N2 output " 1 " signal is when overcurrent, flow through R2 electric current increase, 9 pin voltages descend, when being lower than certain value, and the N2C upset, 14 pin output " 0 " signal, after the input port line PD7 of single-chip microcomputer 1 reads " 0 ", promptly with output signal DISP3 mutually or, if draw " 1 ", then judge the line voltage overcurrent, promptly change and go to carry out the respective handling subprogram.
Momentary power failure detect and delay protection circuit 12 by thermistor R23, resistance R 20, R22, R24, R3, amplifier N2D, diode V5, VK3, VK12, capacitor C 10 compositions.10 pin of N2D meet electrochemical capacitor C10, can detect momentary power failure, and compressor is prevented rotation-clogging protection.When powering on for the first time; there is not charging charge on the capacitor C 10; then 13 pin are output as " 1 " signal; behind instant cut-off, gathered electric charge on the C10, diode V5 oppositely ends; electric charge on the C10 has only 10 pin leakage discharges by N2; arranged certain blanking time, and therefore behind instant cut-off, 13 pin are output as " 0 " signal; after single-chip microcomputer MC6805R3 powers on; read this mouthful line states earlier,, then down do not carry out if read " 0 " signal; up to the C10 discharge off; when reading " 1 " signal, performing a programme has down so just carried out delay protection from hardware again.
Open the door testing circuit 3 by resistance R 28, R29, R3, and diode VK13, VK14, V15, VK16 form.X3, X4, X2 connect a sense switch, X3 and X2 connect the refrigerating chamber door switch ends, X4 and X2 connect the refrigerating-chamber door switch ends, X2 often connects electronegative potential, when the icehouse door is normally closed, the input port line READ2 of single-chip microcomputer 1 reads is R28 (or R29) and VK2, the R3 voltage division signal (approximately 3.6V) to VCC, be high level " 1 ", when the icehouse door is opened or do not shut, the door switch closure, then X3 or X4 are made as " 0 ", and the input port line of single-chip microcomputer 1 is read " 0 " signal, then carry out computing, the door of judging corresponding icehouse is opened.
Defrosting detection, overvoltage/undervoltage detection, over-current detection, momentary power failure detect and the process that detects of opening the door is: single-chip microcomputer 1 is through the delivery outlet DISP1-4 of drive circuit 80 output scanning signal, be " 0 " as if the signal of reading input port line PD7 during routine processes, then with single-chip microcomputer 1 through the value of drive circuit 80 output mutually or, judge each detection signal, as shown in table 1:
Table 1
| Output | Input | State is judged | ||||||
| DISP1 | DISP2 | DISP3 | DISP4 | | LED2 | PD7 | ||
| 1 | 0 | 0 | 0 | 0 | 0 | 0 | Overvoltage | |
| 0 | 1 | 0 | 0 | 0 | 0 | 0 | Under-voltage | |
| 0 | 0 | 1 | 0 | 0 | 0 | 0 | Overcurrent | |
| 0 | 0 | 0 | 1 | 0 | 0 | 0 | Defrosting | |
| 0 | 0 | 0 | 0 | 1 | 0 | 0 | Refrigerating-chamber door is opened | |
| 0 | 0 | 0 | 0 | 0 | 1 | 0 | Refrigerating chamber door is opened | |
As shown in Figure 3, in the supporting refrigerator pipeline of this refrigerator controller, except that comprising refrigerator evaporator R, freezer evaporator F, condenser capillary and compressor 75, on refrigerator evaporator R and condenser capillary L, be equiped with magnetic valve DSV1 and DSV2 in addition respectively and control the temperature of refrigerating chamber and refrigerating chamber and the purpose of defrosting to reach by control magnetic valve DSV1 and DSV2.The each several part duty is as shown in table 2:
Table 2
| The state of | 1 | 1 | 1 | 0 |
| Magnetic valve DSV1 | 1 | 0 | ||
| Magnetic valve DSV2 | 1 | 1 | 0 | |
| The refrigerator work state | The refrigerating chamber refrigeration | The refrigerating chamber refrigeration | Defrosting | Do not work |
Shown in Fig. 2 C, carry out the drive circuit 71 that drive circuit 7 comprises the drive circuit 70 that is used for drive compression machine 75 and is used to drive magnetic valve DSV1, DSV2, wherein, the start and stop of compressor 75 are to be reached by the closed and disconnected of drive circuit D5:MC1413 (label is POWER, 12 pin of D5:MC1413) control relay by the delivery outlet line PC5 of single-chip microcomputer 1.
Magnetic valve DSV1 and DSV2 control its conducting and disconnection by isolated gate FET IRF9520 and IRF520 (V15-V22).
The break-make of magnetic valve is controlled by voltage pulse signal as shown in Figure 4.
Described magnetic valve is taked the bistable magnetic valve, and driving circuit for electromagnetic valve 71 is made up of resistance R 43～R53,4 operational amplifier N1A～N1D, 8 isolated gate FET V15～V22 and diode V23～V30; Per 2 FETs that are connected in series mutually are corresponding to 1 operational amplifier; The positive input terminal of each operational amplifier is connected to the delivery outlet line of single-chip microcomputer, its negative input end connects a voltage source, its output is connected to the grid of 1 pair of FET respectively through 2 diodes, two source electrodes of every pair of FET connect respectively+15V and-15V voltage, the common point that two drain electrodes of every pair of FET are connected is combined as pair of output with another to the common point that two drain electrodes of FET are connected, and each is connected to the positive and negative contact of respective electrical magnet valve to output; Drain electrode as FET V15 and V16 is connected at contact 72, the source electrode of V15 connects+the 15V power supply, the source electrode of V16 connects-the 15V power supply, the grid of V15 and V16 is connected with the output of operational amplifier N1A by diode V23 and V24 respectively, the common junction 72 of FET V15 and V16, the common junction 72 of FET V17 and V18 ' this two contact 72 and 72 ' be connected to two positive and negative contacts of a magnetic valve.Other each same as described above to FET and corresponding operational amplifier connected mode.
The delivery outlet line PC0 of single-chip microcomputer 1 and PC1 control magnetic valve DSV1, PC2 and PC3 control magnetic valve DSV2, when PC0 output high level " 1 ", isolated gate FET V15 conducting contact 72 outputs+15 signals, while PC1 output low level " 0 ", isolated gate FET V18 conducting, contact output-15V signal, behind the time-delay 200mS, PC0 and PC1 stop output, and contact 72 and contact 72 ' output are unsettled, like this, just just at DSV1, negative terminal formed+narrow pulse signal of 30V, and make magnetic valve DSV1 become conducting, in like manner by disconnection, when PC0 and PC1 export " 0 " and " 1 " respectively, V16, the V17 conducting, contact 72 output-15V signals, contact 72 ' output+15V signal, at DSV1 just, the narrow pulse signal of negative terminal formation-30V makes magnetic valve DSV1 become disconnection by conducting.PC2 and PC3 control DSV2 are by same principle work.In sum, the situation of the delivery outlet line traffic control magnetic valve DSV1 of single-chip microcomputer 1 and DSV2 can be represented by table 3:
Table 3
| The valve state | Open (ON) | Turn-off (OFF) | Floating empty (constant) | The bistable magnetic valve | |
| Mouth line level value | |||||
| The | 1 | 0 | 1 | 0 | DSV1 |
| The PC1 level | 0 | 1 | 1 | 0 | |
| The | 1 | 0 | 1 | 0 | DSV2 |
| The PC3 level | 0 | 1 | 1 | 0 | |
Control three-door refrigerator if desired, then need three bistable magnetic valves, at this moment can be with the output (contact 72) of V15 and V16 as common port, it is the positive and negative end that contact 72 and 72 ' meets DSV1, contact 72 and 73 connects the positive and negative end of DSV2, contact 72 and 73 ' connects the positive and negative terminals of the 3rd magnetic valve, so just can finish control.The mouth line level of single-chip microcomputer 1 is as shown in table 4:
Table 4
| The valve state | Open (ON) | Turn-off (OFF) | Floating empty (constant) | The bistable magnetic valve | |
| Mouth line level value | |||||
| The | 1 | 0 | 1 | 0 | DSV1 |
| The PC1 level | 0 | 1 | 1 | 0 | |
| The | 1 | 0 | 1 | 0 | DSV2 |
| The PC2 level | 0 | 1 | 1 | 0 | |
| The | 1 | 0 | 1 | 0 | DSV3 |
| The PC3 level | 0 | 1 | 1 | 0 | |
In addition, executive circuit also comprises: buzzer, refrigerating chamber gate light, they are respectively moving by D5:MC1413 Lai Ma district by delivery outlet line PA6, the PC4 of single-chip microcomputer 1.
As Fig. 2 B and shown in Figure 13 its is key scan and display circuit:
Keyboard scan and display circuit be by exclusion R7, drive circuit 70, and resistance R 17, button S1-S5, integrated four cloudy charactron H9 altogether, LED lamp H1-H8, diode VK6, VK7, VK8, VK17, VK18 form.Charactron H9 is driven by the PA mouth and the PB mouth of single-chip microcomputer, and key scan is by the PD6 and the PA0-PA4 (driving by drive circuit 70) of single-chip microcomputer 1.
This refrigerator Computerized controller is provided with three button K1, K2, K3, and the user can select mode of operation or preferred temperature is set by the combination of pressing different keys or key.When the user presses key, single-chip microcomputer 1 is read " 0 " signal by input port line PD6, check the state of delivery outlet line DISP1, DISP2, DISP3 then, carry out computing, judge respective keys, for example when DISP1 and DISP2 are output as " 0 " and DISP3 and are output as " 1 ", judge that then S1 and S2 press simultaneously, rotate then and carry out the respective handling subprogram.In addition, as shown in Figure 1, delivery outlet line DISP4 and LED1 can expand to button five.
This controller has three indicator lamps, can indicate power supply, compressor and warning respectively, is controlled the light on and off of lamp by delivery outlet line PB0, PB1, PB2 and the LED2 of single-chip microcomputer.As shown in Figure 1, PB3-PB7 can expand to indicator lamp eight.
This controller is total to cloudy LED charactron TOF3407CX with one integrated four, the preferred temperature that utilization trend scanning technique comes explicit user to be provided with, the temperature of the temperature of surrounding environment and two icehouses.The position drives and is finished by drive circuit 80 by the PA mouth, and section drives and finished by the PB mouth, and pull-up resistor row R7 has increased drive current.
Watchdog circuit:
By time base circuit 60V4 and triode V3, capacitor C 3, resistance R 5, R6, capacitor C 4 is formed, and time base circuit 60 employing models are 555 time base circuit; During the single-chip microcomputer operate as normal, delivery outlet line PA7 sends " a 1 " signal every 100 μ S, makes the V3 conducting, 2 pin of V4 are " 0 ", thus 3 pin outputs " 1 ", and 3 pin of V4 connect the reset terminal of single-chip microcomputer 1, when the single-chip microcomputer clock was random, promptly cisco unity malfunction then can't send " 1 " signal, then capacitor C 4 is charged by R8, when running up to certain program, the upset of 3 pin of V4, output " 0 ", force single-chip microcomputer 1 to reset, guaranteed that from hardware single-chip microcomputer does not carry out maloperation like this.
It is the memory circuit of 93C46 that memory circuit 5 adopts model, and this is a kind of eeprom chip, uses 4 Tiaokou lines of single-chip microcomputer 1 to carry out chip select, reading and writing operation, has adopted software simulation serial transmission technology, and only 1 Tiaokou line PC7 reads, and 1 Tiaokou line PA7 writes.Memory circuit 5 is used for the numerical value that store initialization numerical value and user are provided with, even power down can not lost yet.
The protection of compressor
Application number be in 93207968.7 the patent document about the holding circuit of microcomputer electric refrigerator singlechip controller, be to adopt the method that the overvoltage/undervoltage signal is a close compressor that detects.
Because compressor is subjected to the influence of refrigeration pipe, production technology, behaviour in service, makes the voltage protection scope narrow, this situation for domestic electrical network is more restricted.General refrigerator does not have protector, though be suitable for voltage range more greatly, the danger that has compressor to burn out for some situation.Above-mentioned patent is as cost with the electrical network scope of application of sacrificing the user to the protection of compressor.And design of the present utility model is more reasonable to the protection of compressor, and the electrical network scope of refrigerator work is increased.Line voltage too high and low excessively be the compressor key factor of starting smoothly, but be not the last criterion that protection is carried out.We adopt the detection of current signal, and as the back level protection of electric voltage over press, under-voltage protection, and the processing of software improves its applicability, sees Fig. 9, can improve reliability on the other hand simultaneously.For software control, as auxiliary judgment, the tripping force of compressor is carried out timing apart from holding time by starting current with the overvoltage/undervoltage of line voltage, if satisfy following situation:
(1) in the starting process of compressor, surpass 4A if detect electric current, continue more than three seconds;
(2) after the compressor start, in the normal operation, surpass 4A, continue more than one second if detect electric current; Then can carry out corresponding protection (being close compressor).(software flow as shown in Figure 9).
As shown in Figure 6, it is the main program flow of this refrigerator computer controller:
Program powers on and brings into operation, the I/O mouth of initialization single-chip microcomputer, start watchdog circuit, close magnetic valve, read the value of setting (Default Value or user are provided with) among the EEPROM, survey temperature of refrigerating chamber Tc by above-mentioned temperature sensing circuit, freezer temperature Td, environment temperature Th, show temperature of refrigerating chamber Tc by display circuit, freezer temperature Td, environment temperature Th, detect by key scan and overvoltage/undervoltage, over-current detection, defrosting detects, momentary power failure detects, the testing circuit that opens the door reads the state of button and testing circuit, according to the state of temperature that records and the testing circuit status word of writing a program, default setting program status word (PSW)=01 is after the defrosting testing circuit detects signal, program status word (PSW)=02, after the testing circuit that opens the door detected signal, program status word (PSW)=04 was after overvoltage/undervoltage and over-current detection circuit detect signal, program status word (PSW)=08, if detect the momentary power failure signal, then not down operation of program, circular wait, behind the momentary power failure blackout, down carry out again.The reader status word; if program status word (PSW)=01; then carry out temperature control and handle subprogram; if program status word (PSW)=02; then carry out defrosting and handle subprogram, if program status word (PSW)=04, then carry out door opening times and time memory subprogram; if program status word (PSW)=08, then execute exception power protection subprogram.
As shown in Figure 7, it handles the subprogram flow process for temperature control:
Enter subprogram,, concerning an icehouse, suppose the temperature value that four samplings are arranged, T0, T1, T2, T3, then DT=(T3-T2)-(T1-T0) at first according to sampled value accounting temperature rate of change DT, temperature difference ET, environment temperature Th; ET=current temperature value (Tc or Td)-target temperature value (or user's value of setting); Th is an ambient temperature value.Read door opening times, door opening times whenever measures an enabling signal by the testing circuit that opens the door and just makes the door opening times register add one to obtain.Judge whether that according to DT, ET, Th, door opening times needs are to this chamber refrigeration.If environment temperature is higher than 25 ℃, door opening times is more than 10 times, and rate of temperature change is greater than 1 ℃, and temperature difference is greater than 5 ℃, then to this chamber refrigeration; If environment temperature is higher than 25 ℃, door opening times is less than 10 times, and rate of temperature change is greater than 2 ℃, and temperature difference is greater than 6 ℃, then to this chamber refrigeration; If environment temperature is lower than 25 ℃, door opening times is less than 15 times, and rate of temperature change is greater than 2 ℃, and temperature difference is greater than 6 ℃, then to this chamber refrigeration; Otherwise not to this chamber refrigeration.
As shown in Figure 8, it handles the subprogram flow process for defrosting:
When program is read above-mentioned defrosting inspection otherwise during defrosting signal that electric circuit inspection arrives, then write the corresponding program status word, transfer the execution defrosting from main program and handle subprogram, at first read environment temperature Th and door opening times, if environment temperature is higher than 25 ℃, door opening times is more than 10 times, or environment temperature is lower than 25 ℃, door opening times then defrosts more than 15 times; Otherwise do not defrost.
As shown in Figure 9, its be door opening times and time memory the subprogram flow process:
Enter subprogram, judge whether that at first refrigerating chamber opens the door, if not refrigerating chamber opens the door, judge whether that then refrigerating chamber opens the door,, then make refrigerating chamber (or refrigerating chamber) counter register that opens the door add 1 if refrigerating chamber (or refrigerating chamber) opens the door, start timer conter, if in 3 minutes timings, no longer include enabling signal, then return; If 3 minutes these guests, still have enabling signal, then start buzzer and alarm lamp.
As shown in figure 10, it is an abnormal electrical source protection subprogram flow process:
Enter subprogram, at first judged whether the overcurrent protection sign, then judged whether overvoltage or under-voltage signal, if then close compressor of overvoltage/undervoltage signal is arranged if having; If there is not the overcurrent protection sign then to judge whether overvoltage/undervoltage signal and over-current signal, if there is not the overvoltage/undervoltage signal not have over-current signal then to return yet, if have overvoltage/undervoltage and over-current signal to judge that then whether compressor is for leaving, judge whether again to start if open, if start, judge that then whether over-current signal continues 1 second, if continue 1 second, then puts the overcurrent protection sign; If compressor starts, move, judge that then whether over-current signal continues 3 seconds, if continue 3 seconds, then puts the overcurrent protection sign.Otherwise clear overcurrent protection sign returns.
Claims (7)
1. a refrigerator computer controller comprises controller panel and controller circuitry; Controller circuitry comprises: open the door testing circuit, an overvoltage/undervoltage testing circuit, a watchdog circuit and one of a single-chip microcomputer, a memory circuit, a temperature sensing circuit, carried out drive circuit, it is characterized in that, also comprises:
One defrosting testing circuit, an over-current detection circuit, an instantaneous outage detection and delay protection circuit and a key scan and display circuit;
Described single-chip microcomputer by the input port line read temperature sensing circuit, the testing circuit that opens the door, overvoltage/undervoltage testing circuit, defrosting testing circuit, over-current detection circuit and momentary power failure detects and the status data of delay protection circuit, after the program judgement that is pre-stored in described memory circuit, realize temperature control and defrosting by described execution drive circuit; Described memory circuit is by Single-chip Controlling storage Default Value and the relevant temperature through pressing key assignments; Key scanning circuit reads the temperature that is provided with of storing in the described memory circuit by the input port line of single-chip microcomputer, and described watchdog circuit is used for automatically reseting of single-chip microcomputer.
Described controller panel is provided with display screen, is used to indicate indicator lamp and three buttons that are used to set and show refrigerating chamber, refrigerating chamber, environment temperature of power supply, compressor operating and alarm condition.
2. refrigerator computer controller according to claim 1 is characterized in that, described defrosting testing circuit comprises that one detects the thermistor and an operational amplifier of freezing chamber evaporator actuator temperature; Thermistor is connected in the positive input terminal of operational amplifier, and the negative input end of operational amplifier is connected in a comparative voltage source, and the output of operational amplifier is connected to an input port line of described single-chip microcomputer by a diode;
Described momentary power failure detects and the delay protection circuit is on described defrosting testing circuit basis, connects a charging capacitor at the negative input end of described operational amplifier.
3. refrigerator computer controller according to claim 1, it is characterized in that, described over-current detection circuit comprises a photoelectrical coupler, an operational amplifier, a bleeder circuit, bleeder circuit is from the line voltage dividing potential drop, the gained voltage signal is through photoelectric coupler isolation and transfer a current signal to, be added to the positive input terminal of described operational amplifier, the negative input end of operational amplifier is connected in a comparative voltage source, and the output of operational amplifier is connected to a described input port line by a diode.
4. refrigerator computer controller according to claim 1, it is characterized in that, described overvoltage/undervoltage testing circuit comprises two bleeder circuits, two operational amplifiers that input is connected in series mutually, the benchmark high voltage signal that a described bleeder circuit is got from supply voltage Vcc, the benchmark low voltage signal that another bleeder circuit is got from supply voltage Vcc, just transport to described two operational amplifiers respectively, negative input end, the public input of two operational amplifiers through two resistance connect respectively+12V is to-detected the voltage signal of 15V, the output of two operational amplifiers all is connected to an input port line of single-chip microcomputer by diode.
6. refrigerator computer controller according to claim 1 is characterized in that, described execution drive circuit comprises that a drive circuit and that is used to control the compressor start and stop is used to control the drive circuit of refrigerator pipeline electromagnetic valve;
It is the integrated circuit of MC1413 that preceding one drive circuit adopts a model;
Back one drive circuit comprises 4 operational amplifiers and 4 pairs of FETs, and the FET that per 2 drain electrodes are connected is corresponding to 1 operational amplifier; The positive input terminal of each operational amplifier is connected to the delivery outlet line of single-chip microcomputer, its negative input end connects a voltage source, its output is connected to the grid of 1 pair of FET respectively through 2 diodes, two source electrodes of every pair of FET connect respectively+15V and-15V voltage, the common point that two drain electrodes of every pair of FET are connected is combined as pair of output with another to the common point that two drain electrodes of FET are connected, and each is connected to the positive and negative contact of respective electrical magnet valve to output.
7. refrigerator computer controller according to claim 1 is characterized in that, described key scan and display circuit comprise row's resistance, drive circuit, one group of button, one group of charactron and the one group of diode that is made of integrated circuit; The position of charactron drives and the section driving is driven by the PA mouth and the PB mouth of single-chip microcomputer respectively; Key scan is finished by single-chip microcomputer PD6, PA0～PA4 and one drive circuit.
8. refrigerator computer controller according to claim 1 is characterized in that, it is the single-chip microcomputer of MC6805R3 that described single-chip microcomputer adopts model.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95200071 CN2221757Y (en) | 1995-01-09 | 1995-01-09 | Computer controller of refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95200071 CN2221757Y (en) | 1995-01-09 | 1995-01-09 | Computer controller of refrigerator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2221757Y true CN2221757Y (en) | 1996-03-06 |
Family
ID=33853925
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95200071 Expired - Fee Related CN2221757Y (en) | 1995-01-09 | 1995-01-09 | Computer controller of refrigerator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2221757Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102216708A (en) * | 2008-11-19 | 2011-10-12 | Bsh博世和西门子家用电器有限公司 | Domestic refrigeration appliance |
| CN104930812A (en) * | 2015-06-03 | 2015-09-23 | 合肥美的电冰箱有限公司 | Electric control board integrated with power supply, display, control and illumination and refrigerator |
| CN108001327A (en) * | 2016-10-31 | 2018-05-08 | 比亚迪股份有限公司 | Automobile, car refrigerator anticollision device, collision-prevention device and its control method |
| CN110631324A (en) * | 2019-10-14 | 2019-12-31 | 南京创维电器研究院有限公司 | Control and interaction method of embedded refrigeration equipment |
-
1995
- 1995-01-09 CN CN 95200071 patent/CN2221757Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102216708A (en) * | 2008-11-19 | 2011-10-12 | Bsh博世和西门子家用电器有限公司 | Domestic refrigeration appliance |
| CN102216708B (en) * | 2008-11-19 | 2015-01-28 | Bsh博世和西门子家用电器有限公司 | Domestic refrigeration appliance |
| CN104930812A (en) * | 2015-06-03 | 2015-09-23 | 合肥美的电冰箱有限公司 | Electric control board integrated with power supply, display, control and illumination and refrigerator |
| CN108001327A (en) * | 2016-10-31 | 2018-05-08 | 比亚迪股份有限公司 | Automobile, car refrigerator anticollision device, collision-prevention device and its control method |
| CN108001327B (en) * | 2016-10-31 | 2023-10-17 | 比亚迪股份有限公司 | Anti-collision device for automobile and vehicle-mounted refrigerator and control method thereof |
| CN110631324A (en) * | 2019-10-14 | 2019-12-31 | 南京创维电器研究院有限公司 | Control and interaction method of embedded refrigeration equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106571616B (en) | Power supply suspend mode and wake-up circuit | |
| CN204757538U (en) | Solar energy semiconductor refrigeration box with speech control | |
| CN2221757Y (en) | Computer controller of refrigerator | |
| CN201876792U (en) | Intelligent solar-energy notebook radiator | |
| CN207612096U (en) | A kind of battery combining control circuit and battery combiner | |
| CN201355092Y (en) | General type intelligent energy-saving linked controller | |
| CN108925067B (en) | Anti-fog and anti-freezing floor type advertisement all-in-one machine based on wind power generation and control system thereof | |
| CN2307250Y (en) | Water storage type water heater controlled by microcomputer | |
| CN201260253Y (en) | Lamp control device in aquarium box | |
| CN206788613U (en) | A kind of intelligent switch | |
| CN202573976U (en) | Car and indoor lamp system thereof | |
| CN205726591U (en) | A kind of SCM Based Solar Street Lighting System | |
| CN205176537U (en) | Combination switch control circuit of single channel AD sampling | |
| CN208504840U (en) | Electronic type defrosting timer | |
| CN2559025Y (en) | Automatic temp. controller | |
| KR200328264Y1 (en) | An intelligent photovoltaic street lamp control unit which actively copes with a change in weather | |
| CN209233247U (en) | A kind of Multi-functional Lighting case | |
| CN2515715Y (en) | Radiating fan controller in computer case | |
| CN205430741U (en) | Indoor electric light auto -power -off economizer system | |
| CN2230938Y (en) | Computer controller for air conditioner | |
| CN203167381U (en) | A solar-energy illuminating lamp intelligent controller | |
| CN2499270Y (en) | Refrigerator carried in car | |
| CN88101808A (en) | The demonstration of refrigerator, control device | |
| CN103209523A (en) | Intelligent controller for solar illumination lamp | |
| CN201656822U (en) | Novel solar controller |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |