CN2077613U - Control circuit for protecting compressor of household refrigerator - Google Patents
Control circuit for protecting compressor of household refrigerator Download PDFInfo
- Publication number
- CN2077613U CN2077613U CN 90218211 CN90218211U CN2077613U CN 2077613 U CN2077613 U CN 2077613U CN 90218211 CN90218211 CN 90218211 CN 90218211 U CN90218211 U CN 90218211U CN 2077613 U CN2077613 U CN 2077613U
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- China
- Prior art keywords
- compressor
- protection
- circuit
- refrigerator
- overload
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- 238000005057 refrigeration Methods 0.000 claims description 8
- 238000005070 sampling Methods 0.000 claims description 5
- 230000005856 abnormality Effects 0.000 abstract 1
- 238000001514 detection method Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 230000004888 barrier function Effects 0.000 description 10
- 239000007787 solid Substances 0.000 description 10
- 230000005611 electricity Effects 0.000 description 4
- 238000004804 winding Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000001012 protector Effects 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Landscapes
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
The control circuit for protecting compressor of domestic refrigerator is formed from working current detection circuit, working state comparator, digital counter and digital logic circuit. The method can realize the failure of normal shutdown of the compressor and the judgment of overload faults of the compressor, and can realize the functions of power-on delay and power grid voltage abnormality protection. Overload and non-stop protection is a fault judging system which sends the detected current signal of the refrigerator to a control circuit, and when the circuit judges that the current signal is faulty, the digital logic circuit carries out protection. The overload protection cannot automatically reset after the power supply is cut off. The non-stop protection adopts a timing mode to intermittently supply power to the refrigerator.
Description
Touch upon a kind of control circuit of household electric refrigerator compressor protection of the utility model.
Typical prior art is the various refrigerator protectors of selling in the market.They mainly contain following form: (one) utilizes 555 time-base circuits and RC element to realize energising time-delay in 5--10 minute.(2) comparator that utilizes operational amplifier to form is realized superpressure and under-voltage tripping protection to power supply.(3), add the electrical leakage breaking power protection based on above-mentioned two kinds of circuit.
The purpose of this utility model provides compared with prior art a kind of, can some unexpected solid barrier of refrigerator be detected and judge, when thinking when fault is arranged, realizes a kind of control circuit of corresponding protection.
The control circuit that the utility model provides is characterised in that: the total current to refrigerator is taken a sample, after amplifying rectification, send into the operating state comparator of two different reference voltages, by comparing, judge the running status of compressor for refrigeration with the reference voltage of setting.Comparison signal is sent into Digital Logical Circuits, starts different compressor operating time-delay passage, compares with the compressor running time with the time that the compressor operating of setting is allowed under various states.The compressor operating time, behind the left alone without help machine of compressor, logical circuit automatically reset to initial condition as during the time, thinking promptly that refrigerator does not have solid barrier less than the permission under certain state.The running time of compressor is when being set under certain state the time that allows, and the utility model control circuit thinks that promptly refrigerator has solid barrier, and the logical circuit action is taked the corresponding protection measure according to different solid barriers.All defencive functions of the utility model circuit are realized by a digital logic system, and the employing mains frequency is a time-base signal.Digital logic system can increase compressor operating Current Control point (d type flip flop of every increase, a not gate, a comparator can increase a control point) as required.
The utility model household electric refrigerator compressor protection can be realized four kinds of defencive functions with control circuit:
1, overload protection function
When compressor for refrigeration can not normal starting, as PTC component wear or starter relay damage etc.Or overload in running, occurs, as freeze stifled etc.The utility model control circuit protection compressor of will cutting off the electricity supply.Above-mentioned two kinds of solid barriers all may burn compressor.General household electric refrigerator only depends on the overload protective relay protection of self; even and overload protective relay is in that not have the situation that hinders admittedly also longer following operate time; the compressor coil has been raised to higher temperature during outage, so just may accelerate the ageing of insulation of coil, and the compressor life-span is reduced.
2, can not the orderly closedown protection
When the utility model control circuit thinks that compressor for refrigeration is can not be normal left alone without help, just realize protection.Compressor can not shut down solid barrier mainly due to temperature controller have that solid barrier, refrigerator doors are not closed tight, thermostat regulates turn-knob and is screwed into the quick-frozen shelves and forgets cycle, refrigerating system to hinder admittedly and reason such as can not normally freeze causes.Refrigerator occurs above-mentioned when hindering admittedly, and compressor can only turn round continuously, has so not only consumed electric energy and also there is certain influence in life-span of compressor for refrigeration.Because protector is cut off the electricity supply and made food thawing in the refrigerator, the utility model control circuit will be realized keeping on the go with timing mode intermittently to the refrigerator power supply after realizing protection in order to prevent.Thereby play the effect of promptly protecting refrigerator to protect food in the refrigerator again.
Above-mentioned two kinds of defencive functions can not automatically reset, and reset if desired, and switch on and get final product a moment of cutting off the electricity supply.
3, on-delay function
If send a telegram here again after running into outage, just the utility model control circuit can be powered incoming call time delay certain hour again to refrigerator.
4, the not normal protection of line voltage
When line voltage was higher than certain value or is lower than certain value, the utility model control circuit just can be cut off the electricity supply.But automatic time delay energising after line voltage is normal.
Existing the giving with reference to the accompanying drawings by example of the performance of the utility model household electric refrigerator compressor protection control circuit describes.Accompanying drawing is the electrical schematic diagram of the utility model household electric refrigerator compressor protection with control circuit.
Entire circuit comprises: 2 have Schmidt's NAND gate IC1 and the IC2 that gate control function is used for the time-base signal shaping; A binary counter group IC3+IC4 who plays time-lag action; One is used for two trigger ends of counter group zero clearing are descended
Trigger monostable flipflop IC5; Three are respectively applied for on-delay; can not hinder judgement and protection admittedly by normal left alone without help machine; the d type flip flop IC6 that the solid barrier of overload is judged and protected; IC7; IC10; three are respectively applied for and keep on the go; can not hinder the locked and two locked input NAND gate IC8 of the solid barrier protection of overload of protection admittedly by orderly closedown; IC9; IC11; the undesired protection of a voltage inverter ic 13; one three input and a door IC12; a refrigerator operating current sampling amplifier A2; a double-limit comparator A1 who is used for the not normal protection of line voltage, two are respectively applied for comparator A3 and the A4 that compressor runs well and overload is judged; sampling transformer B; drive triode BG; relay J and some resistance; electric capacity; diode constitutes.The circuit working principle is as follows:
Energized moment, the RC network of three d type flip flop IC6, IC7 and IC10 QR end is with the trigger zero clearing, in like manner counter group IC3+IC4 also is cleared simultaneously.This moment, IC6, IC7Q held output low level, and door IC8 is by locked output high level.IC10 Q exports high level, and then two of three inputs with door IC12 are that one of high level is low level, are output as low level, and BG ends, and relay is in normally open, the refrigerator outage.Because IC6 Q end output high level, IC1 is opened, and time-base signal is sent into counter group IC3+IC4 after shaping, and counter begins counting, and (base when adopting 50Hz is 2 between counter when counter group the tenth Pyatyi is exported to the high level saltus step
14÷ 300=5.5 branch); The IC6 upset, the Q end becomes high level, and Q becomes low level, and this moment, then it exported high level because three inputs of IC12 are high level entirely, BG conducting, J adhesive, refrigerator energising.Simultaneously, because Q(IC6) end jumped to low by height, and then door IC1 is by locked, and IC5 triggers, and exports a quenching pulse, makes the zero clearing of counter group.If compressor does not turn round, A2 detects less than current signal, and comparator A3 exports high level, and IC9 output low level door IC2 is blocked, and no time-base signal enters the counter group, and then circuit is in initial condition.When compressor start, transformer B detects current signal, gives A2 through the secondary output voltage signal, A2 with the signal amplification, rectification and filtering after, send into A3 and A4 compares.When compressor has just started, because electric current is bigger, A3 and A4 are overturn, do not have solid barrier as refrigerator, electric current enters normal range (NR) very soon, and A4 withdraws from upset, and the output high level makes the IC10D end be in low level by NAND gate IC11, and then IC10 is invalid clock active state.After the A3 upset, output low level, IC9 exports high level.Door IC2 is opened, and IC3+IC4 begins counting, and the IC7D end is high level, is in to jump the upset standby condition.Upset takes place IC7 is when the 20th grade of moment that output is jumped on high level by low level of counter, and base when adopting 50Hz is approximately through 2
10÷ 300=174.76 minute.If the running of compressor one-time continuous is less than this setting-up time, after current signal disappeared, circuit resetted again, and IC2 is closed, and the counter group is cleared.When the compressor continuous operation time surpasses above-mentioned setting-up time, IC7 will overturn, and Q hold output low level, and NAND gate IC9 is exported high level by locked, and an IC2 is forever opened.The Q end is exported high level simultaneously, and IC8 is opened, because this hour counter group Q16 output low level, NAND gate IC8 exports high level.When counter count down to Q16 end again and becomes high level, in the time of 10.9 minutes, IC8 just was output as low level approximately, and relay J is thrown off, the refrigerator outage, and compressor is by left alone without help machine.The Q16 end becomes low level again after 10.9 minutes again, relay adhesive, compressor start running.Circulation is gone down like this, and compressor for refrigeration realizes that under the control of the utility model control circuit opening left alone without help ratio is keeping on the go of 1:1.
Make A4 when upset when detected current strength reaches, this control circuit thinks that promptly compressor for refrigeration is in overload.This moment, A4 was output as low level, by NAND gate IC11, made trigger IC10D termination high level, and IC10 just is in and jumps the upset standby condition.Take place when being starting as overload, then overload time will be with the starting time of setting---the 8th grade of output Q8 of counter goes up and jumps required time (base about 2 when adopting 50Hz
7÷ 50=2.56 second) compare, when overload time surpasses this time, IC10 will overturn, the Q output low level, and relay is thrown off, and refrigerator cuts off the power supply, and prevents to burn compressor.If overload takes place when compressor operating, then the power-off protection time is at random (by the state decision of counter), but the longest operate time of protection is 2.56 seconds.
Supply voltage surpasses or is lower than the normal working voltage protection is to be realized by double-limit comparator A1.A1 compares detected supply voltage with reference voltage, when surpassing the voltage range that sets, and the A1 upset, the output high level is by zero clearing makes the refrigerator outage to d type flip flop IC6 zero clearing with to the counter group.After line voltage is normal, the A1 output low level that resets, IC3+IC4 counting, time-delay certain hour (base about 2 when adopting 50Hz
14÷ 50=5.46 branch) energized realizes automatically reseting.
The utility model control circuit element is selected and is adjusted:
The utility model control circuit can adopt cmos circuit, TTL circuit or both mixed forms to realize.This example is chosen the mixed form of CMOS and TTL circuit.Its advantage is: can reduce the quantity of integrated circuit, simultaneously the better operating state of driven for emitting lights diode indicating circuit again.Two controlled IC1 and IC2 and IC5 are with three doors among the CD4093; IC3+IC4 adopts the serial connection form to constitute with two CD4040; Trigger IC6, IC7, IC10 are with two 74LS74; IC8, IC9, IC11 and IC13 are with a 74LS00; The IC12 door of 74LS11, the relay J contact capacity is 5A.220
The 12V relay; Sampling transformer B is with the transformation of the way of small-sized magnet ring or miniature transformer, elementaryly passes with lead, and is secondary around 40---50 circles; Other element does not have specific (special) requirements.A1, A2, A3, A4 get final product with LM324.
The utility model control circuit has three parts to need to adjust.The reference voltage of normal operating conditions comparator A3 is adjusted W3 and can be set compressor running current starting point, for satisfying the needs of various household electric refrigerators, can be set in refrigerator electric power loop electric current when being 0.35A, the A3 upset.The reference voltage of overload comparator A4 is adjusted W4 and can be set overload of compressor state current starting point, and can be set in refrigerator electric power loop electric current is 1.5A(330W) time, the A4 upset.Double-limit comparator line voltage protection range is adjusted: adjust the size adjustment that W2 can set the normal voltage scope, adjust W1 protection range central point.General domestic refrigerator compressor normal rating operating voltage is 180V-240V.Consider that the data that provide all have certain surplus, then can set 175V within the range having a lower limit of, on be limited to 245V, be central point promptly at 210V.± 16.7% scope is all thought normal working voltage, promptly realizes cutting off the refrigerator power supply above this scope and is protected.
For guaranteeing that the line voltage protection is not subjected to the influence of circuit load (relay), supply transformer should possess two windings.One 12
Winding is supplied with digital circuit+5V stabilized voltage power supply and LM324, relay required+12V brute supply.Another for the double-limit comparator sampling, has enough protection precision to guarantee the not normal protection of line voltage around winding.
Claims (6)
1, a kind of on-delay, the not normal cut-out of line voltage, compressor realized can not protect the household electric refrigerator compressor protection control circuit of protecting with overload of compressor by normal left alone without help organizational security, it is characterized in that: have refrigerator operating current detector, operating state comparator and can hinder the Digital Logical Circuits of judging, protecting admittedly to the refrigerator accident and form.
2, according to the circuit of claim 1, it is characterized in that: the refrigerator current detector is to utilize sampling transformer B and operational amplifier A 2 to constitute.
3, according to the circuit of claim 1, it is characterized in that: by operating state comparator A3 and A4, trigger IC7 and IC10, counter group IC3+IC4 form compressor for refrigeration can not normal left alone without help machine and overload of compressor hinder admittedly and judge and protection system.
4, according to the circuit of claim 1, it is characterized in that: on-delay, the not normal protection of line voltage, can not the orderly closedown protection and four kinds of defencive functions of overload protection only with the digital circuit realization of a cover.
5, according to the circuit of claim 1, it is characterized in that: on-delay, overload are judged time-delay and can not the shared counter group of orderly closedown judgement time-delay be finished.
6, according to the circuit of claim 1; it is characterized in that: compressor for refrigeration can not hinder protection by orderly closedown admittedly; be to utilize trigger IC7 to open NAND gate IC8; by the 16 grade of output Q16 control of counter group IC3+IC4 NAND gate, again by realizing out that by the transistor controls relay J left alone without help ratio is keeping on the go of 1:1 with door IC12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90218211 CN2077613U (en) | 1990-08-19 | 1990-08-19 | Control circuit for protecting compressor of household refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90218211 CN2077613U (en) | 1990-08-19 | 1990-08-19 | Control circuit for protecting compressor of household refrigerator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2077613U true CN2077613U (en) | 1991-05-22 |
Family
ID=4897075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90218211 Withdrawn CN2077613U (en) | 1990-08-19 | 1990-08-19 | Control circuit for protecting compressor of household refrigerator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2077613U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1821578B (en) * | 2001-03-27 | 2010-12-22 | 艾默生环境优化技术有限公司 | Compressor diagnostic system |
| CN103439878A (en) * | 2013-08-28 | 2013-12-11 | 淮北市平祥感应炉有限公司 | Second-time switch-on resistant control device |
| CN104162181B (en) * | 2014-08-05 | 2017-02-08 | 衢州昀睿工业设计有限公司 | Circuit for refrigerator deodorizing preserving device |
-
1990
- 1990-08-19 CN CN 90218211 patent/CN2077613U/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1821578B (en) * | 2001-03-27 | 2010-12-22 | 艾默生环境优化技术有限公司 | Compressor diagnostic system |
| CN1821577B (en) * | 2001-03-27 | 2013-08-14 | 艾默生环境优化技术有限公司 | Compressor diagnostic system |
| CN103439878A (en) * | 2013-08-28 | 2013-12-11 | 淮北市平祥感应炉有限公司 | Second-time switch-on resistant control device |
| CN103439878B (en) * | 2013-08-28 | 2016-04-13 | 淮北市平祥感应炉有限公司 | Anti-secondary closing control device |
| CN104162181B (en) * | 2014-08-05 | 2017-02-08 | 衢州昀睿工业设计有限公司 | Circuit for refrigerator deodorizing preserving device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| 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 |