CN2035864U - Computerized protector for refrigerator - Google Patents
Computerized protector for refrigerator Download PDFInfo
- Publication number
- CN2035864U CN2035864U CN 88209804 CN88209804U CN2035864U CN 2035864 U CN2035864 U CN 2035864U CN 88209804 CN88209804 CN 88209804 CN 88209804 U CN88209804 U CN 88209804U CN 2035864 U CN2035864 U CN 2035864U
- Authority
- CN
- China
- Prior art keywords
- circuit
- diode
- negative pole
- input
- positive pole
- 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.)
- Withdrawn
Links
- 230000001012 protector Effects 0.000 title claims abstract description 20
- 238000001514 detection method Methods 0.000 claims abstract description 6
- 239000003990 capacitor Substances 0.000 claims description 10
- 238000004804 winding Methods 0.000 claims description 6
- 230000003321 amplification Effects 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims 1
- 238000002844 melting Methods 0.000 claims 1
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Images
Landscapes
- Devices That Are Associated With Refrigeration Equipment (AREA)
- Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
Abstract
The utility model provides a computerized protector for refrigerator, which is used for the protection of the refrigerator compressors, composed of a current detection circuit, a voltage detection circuit, a logic circuit, a delay circuit, a driving-and-amplifying circuit, a starting current buffer circuit, a current discrimination circuit, an alarm circuit and a protection control circuit. Two sets of window voltage comparators are adopted in the logic circuit; thus, when the power-off protection is conducted through the over-current, the reasons for the over-current can be analysed and judged and corresponding measures can be taken according to the different situations in the over-current. The refrigerator compressors can be guaranteed not to be burnt out under any situations.
Description
The utility model relates to a kind of improved electronic protection, particularly a kind of intelligent refrigerator protector.
Existing refrigerator protector mainly contains two kinds of voltage-type and current modes.The voltage-type protector postpones after 5 minutes when supply voltage is higher than 250 volts or when being lower than 170 volts, protector can disconnect the power supply of refrigerator immediately, connects power supply again automatically, and Chinese patent CN85204183 number disclosed just belongs to that this is a kind of.There is following shortcoming in the protector of this form: when supply voltage just often; if the refrigerator motor blocks and do not change or the lead-in wire of motor winding comes off, ices stifled, dirty stifled, starting relay contact oxidation loose contact etc. when causing the compressor electric motor overcurrent, the voltage-type protector is powerless to this.Cut off the electricity supply when the current mode protector is compressor electric motor generation overcurrent, delay time and connected power supply in 5～10 minutes again, Chinese patent CN87206118 number disclosed just belongs to that this is a kind of.Its effect is identical with the hot protective relay of refrigerator inside.Do not eliminate (getting stuck) if cause the factor of overcurrent as the long-time on the low side or motor of supply voltage, then above-mentioned power on/off process will be carried out repeatedly, understand the serious harm compressor equally and shorten its service life, particularly when supply voltage is higher than 270V, compressor makes insulation breakdown and damages easilier under high-voltage great-current repeatedly impacts.SG215-84 household electric refrigerator standard three, (2) regulation supply voltage scope are 180～240V; the refrigerator that has still can be worked in 150～270V scope; even but exceed this voltage range refrigerator endure; also will exert an influence to the refrigerator life-span; cut off the electricity supply this moment; stop using to belong to necessity, and the current mode protector does not have this function to the protection freezer compressor is real.
The objective of the invention is to avoid above-mentioned weak point of the prior art and provide a kind of and have the current/voltage defencive function and can discern the breakdown of refrigerator reason and the novel fridge protector of dealing with.
The purpose of this utility model can reach by following measure: the utility model is by current detection circuit; signal amplification driving circuit, delay circuit, protection control circuit, voltage detecting circuit, logic circuit; the electric current discriminator circuit, compositions such as starting current buffer circuit, warning circuit.The utility model adopts current transformer to detect refrigerator operating current size, if refrigerator because of certain reason generation overcurrent, the electric current identification circuit is amplified this signal, drives the protective relay action, cuts off the refrigerator power supply.Meanwhile, voltage detecting circuit and power connection and devote oneself to work.Form two group window voltage comparators (logic circuit) by phase inverter F3, F4, F5, F6 and diode D11, D12, D13, D14 and according to the voltage sample situation overcurrent reason is made logic judgement and processing: supply voltage is in 180～240V scope, overcurrent is caused by breakdown of refrigerator certainly, therefore gives the alarm.(150V or) 280V if supply voltage, overcurrent and supply voltage are closely related, so by F2 cut-out refrigerator power supply, stop refrigerator work, but alarm is not reported to the police.If supply voltage is in 150～180V or 240～280V scope; this moment is because various refrigerator quality differences; overcurrent may be relevant with voltage; also may be relevant with internal fault; survey so protector carries out 5 minutes overcurrents once on the one hand, wait for voltage change on the one hand, normal if supply voltage recovers; the fault-free refrigerator can normally start running, has the fault refrigerator then can not start protector and sends chimes of doom.After delay circuit mainly is the protector power-off protection, every 5～10 minutes refrigerator is carried out over-current detection one time,, will normally move,, continue to carry out power-off protection if still have overcurrent if the refrigerator over current fault is got rid of by the effect of capacitor C 7.The starting current buffer circuit cushions the normal starting electric current effectively by the time-delay of capacitor C 3, prevents that relay J from producing misoperation.
The utility model is described in further detail below in conjunction with (accompanying drawing) embodiment:
Figure (one) is the utility model control principle block diagram.
Figure (two) is the utility model electrical schematic diagram.
With reference to figure () and figure (two), the power supply input circuit of refrigerator by the end L of plug CT through the contact of the elementary winding of BX summation current transformer B1, protective relay J 2,3 ends, to accessory power outlet CZ, by arriving attaching plug CT other end N behind the refrigerator.
Current detection circuit is by transformer B1, and commutation diode D1 and filter capacitor C1 form.The elementary windings in series of B1 is in the power supply input circuit of refrigerator, and the B1 secondary windings connects the current rectifying and wave filtering circuit of being made up of D1, C1, and the DC voltage of the last generation of C1 is directly proportional with the refrigerator operating current.This voltage offers driving triode BG1 by D7 and control relay J makes work voltage, makes work voltage through the R2 current limliting after D2 supplies with 14 pin of IC 1, gives the electric current discriminator circuit through R3, D3 simultaneously.During the refrigerator operate as normal, B1 secondary induction voltage is very little, can only do luminous for LED1 by resistance R 1.
The electric current discriminator circuit is made up of the F1 among the IC1, F2 two-stage phase inverter, the input 9 of F1 connects the negative pole of diode D3 by R5, and output 8 connects the input 5 of F2 by R6, and 7 pin of F1 are to ground (being 7 pin of IC1) in addition, the output 6 of F2 is received the D9 negative pole through R7, and the D9 positive pole links to each other with BG1.During refrigerator generation overcurrent, the F1 input signal is higher than its valve level, the F1 output low level, and F2 exports high level signal, makes BG1 saturated, drives the J adhesive, cuts off the refrigerator power supply, realizes overcurrent protection.
Meanwhile by relay J B2 is inserted power circuit, voltage detecting circuit is devoted oneself to work, and transformer B2 is the civil power step-down, and one group through the D17 rectification, provides IC1 after the C5 filtering, and it is luminous for LED2 through R9 simultaneously that relay J and BG1, BG2, BG3 make work voltage; Another group makes to detect voltage behind D10, C4 rectifying and wave-filtering.By F3, F4, D13, D14 and F5, F6, D11, D12 constitutes two group window voltage comparators (logic circuit), the F5 input 13 of IC1 is connected with the mid point of potentiometer W1 in the logic circuit, output 12 is connected with the input 11 of F6 among the IC1 by diode D11, the output 10 of F6 is connected with the input of warning circuit by diode D15, the negative pole of diode D12 links to each other with 11 pin of the negative pole of D11 and F6, the positive pole of D12 is connected with the mid point of potentiometer W2, the input 1 of F3 is connected with the mid point of potentiometer W3 among the IC1, output 2 is connected with the input 3 of F4 among the IC1 by diode D13, the output 4 of F4 is connected with input 5 pin of F2 among the IC1 by diode D16, the negative pole of diode D14 is connected with the input 3 of the negative pole of D13 and F4, the positive pole of D14 is connected with the mid point of potentiometer W4,14 pin of F4 also with diode D4, D2, D18, the positive pole of the negative pole of D19 and capacitor C 6 connects, DC voltage supply side as IC1, W1, W2, W3, the end of W4 is connected to each other ground, the other end is connected to each other through resistance R 8 and is connected secondary 7.5 of the positive pole of D10 and B2 with the negative pole of diode D10 and the positive pole of filter capacitor C4
Winding connects.By adjusting the mid point that W1 and W2 can make logic circuit F5 input 13(W1 when supply voltage is 180～240V) voltage greater than its valve level, F6 end (mid point of potentiometer W2) input voltage is less than its valve level, then F6 exports high level signal, the alarm work that triggering is made up of elements such as BG2, BG3, HTD sends chimes of doom.When supply voltage during less than 180V, F5 end (mid point of W1) input voltage becomes and is lower than the valve level, F6 end (mid point of W2) still is lower than the valve level, so F6 output low level signal, and when supply voltage during greater than 240V, F5 end (mid point of W1) and F6 end (mid point of W2) voltage are all greater than the valve level, and then F6 output also is low level signal, and the both of these case alarm is not worked.In like manner, by adjusting W3 and W4.When supply voltage during in 150～270V scope, F4 exports high level signal, because D16 isolates, it does not have influence to F2, but when voltage during less than 150V or greater than 270V, F4 output low level signal, 5 pin of F2 also are low level signal, force F2 output high level, the refrigerator power supply is cut off in the relay J adhesive.This kind situation will continue always, and when mains voltage variations to 150～270V scope, F4 exports high level, cancels the control action to F2.If supply voltage is in 150～180V or 240～270V scope, the F6 output low level is not reported to the police, and F4 exports high level, and F2 is not had control action, and the electric current discriminator circuit will be controlled by delay circuit.
Delay circuit mainly is made up of C7, R4.The negative terminal of C7 joins by R5 and F1 input 9, and is connected with the negative pole of resistance R 4, R5 and diode D3, D5, the positive pole of D4, and the positive pole of C7 is connected with the positive pole of D18 and R10.When carrying out power-off protection; in the B2 place in circuit; the positive pole of C7 (A point) produces the voltage close with D19 voltage stabilizing value immediately, and the negative pole (B point) of C7 produces and A point equivalent voltage simultaneously, and this voltage and several palmistrys of F1 operating voltage are together; force F1 output low level signal; make F2 output high level signal, J keeps adhesive, and refrigerator keeps off-position; after this C7 slowly charges by R4; the C7 both end voltage constantly rises, and the last voltage of R4 constantly descends, after 5～10 minutes; when the B point voltage is reduced under the F1 valve level; F1 exports high level, the F2 output low level, and J discharges; connect the refrigerator power supply; if the refrigerator over current fault is got rid of, will normally move, if still have overcurrent; J is adhesive again; continue to carry out power-off protection and since supply voltage rest on the time of 150～180V or 240～270V scope generally can be very not long, and some refrigerator still can operate as normal in this voltage range; chance and number of times that overcurrent takes place can be not too many, can not cause harmful effect to refrigerator so of short duration overcurrent is surveyed.
R7, C3 and D9 form the starting current buffer circuit, and the D9 negative pole links to each other with C3 positive pole and R7, and the D9 positive pole links to each other with the BG1 base stage, and the C3 negative pole links to each other with ground.Because the delayed-action of C3 and R7 has cushioned the normal starting electric current effectively, prevent that relay J from producing misoperation.
The effect of diode D4 is that the voltage Pliers that B is ordered is positioned at the IC1 operating voltage; protection F1 input is not damaged by high-voltage pulse; D2, D6, D7, D18 play the power supply buffer action; current protection and voltage protection circuit two parts working power are independent of each other; the D8 that is connected in the relay J two ends is a fly-wheel diode; D5 is the input protection diode, and C2 is an anti-interference capacitor.
R9, LED2 and R1, LED1 form protection indication and refrigerator operation indicating circuit respectively.
The utility model has following advantage compared to existing technology:
1, has current/voltage defencive function and can identify the breakdown of refrigerator reason and deal with.
2, cost is low, function is many, and main function is only finished by a cheapness six not gate CMOS integrated circuit CD4069, and control circuit is only used a small-sized middle power relay of single contact.
3, working stability, dependable performance is debug easily.
Claims (5)
1; a kind of intelligent refrigerator protector; by current detection circuit; the signal amplification driving circuit; voltage detecting circuit; warning circuit is formed; it is characterized in that: the input 13 of not gate F5 is connected with the mid point of potentiometer W1 in the IC 1; output 12 is connected with the input 11 of not gate F6 among the IC1 by diode D11; the output 10 of F6 is connected with the input of warning circuit by diode D15; the negative pole of diode D12 links to each other with 11 pin of the negative pole of D11 and F6; the positive pole of D12 is connected with the mid point of potentiometer W2; the input 1 of not gate F3 is connected with the mid point of potentiometer W3 among the IC1; output 2 is connected with the input 3 of not gate F4 among the IC1 by diode D13; the output 4 of F4 is connected with input 5 pin of F2 among the IC1 by diode D16; the negative pole of diode D14 is connected with the input 3 of the negative pole of D13 and F4; the positive pole of D14 is connected with the mid point of potentiometer W4; 14 pin of F4 also with diode D4; D2; D18; the positive pole of the negative pole of D19 and capacitor C 6 connects; operating voltage supply side as IC1; W1; W2; W3; the end of W4 is connected to each other ground; the other end is connected to each other through resistance R 8 and is connected secondary 7.5 of the positive pole of D10 and B2 with the negative pole of diode D10 and the positive pole of filter capacitor C4
Winding connects.
2, protector according to claim 1; it is characterized in that protecting an end of relay J in the control circuit to be connected with the positive pole of BG1 colelctor electrode and diode D8; the other end is connected with the negative pole of diode D6, D7, D8; the contact 1 of relay J is connected with transformer B2 primary coil; contact 2 is connected with socket CZ, and melting point 3 is connected with (1) end of current transformer B1.
3, protector according to claim 1 is characterized in that capacitor C 7 positive poles in the delay circuit are connected with positive pole and the R10 of D18, and negative pole is connected with the negative pole of resistance R 4, R5 and diode D3, D5, the positive pole of D4.
4, protector according to claim 1; it is characterized in that in the electric current identification circuit; the input 9 of F1 is connected with the negative pole of D3, D5, the negative pole of C7, positive pole and the R4 of D4 by resistance R 5 in the IC 1; the output 8 of F1 links to each other by input 5 pin of F2 among resistance R 6 and the IC1, the positive pole of capacitor C 2, the positive pole of D16, and the output of F2 passes through resistance R 7 and links to each other with the base stage of BG1 with diode D9.
5, protector according to claim 1 is characterized in that the positive pole of C3 in the starting current buffer circuit and the negative pole of resistance R 7 and diode D9 join, and the negative pole of C3 links to each other with ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88209804 CN2035864U (en) | 1988-08-15 | 1988-08-15 | Computerized protector for refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88209804 CN2035864U (en) | 1988-08-15 | 1988-08-15 | Computerized protector for refrigerator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2035864U true CN2035864U (en) | 1989-04-12 |
Family
ID=4843379
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88209804 Withdrawn CN2035864U (en) | 1988-08-15 | 1988-08-15 | Computerized protector for refrigerator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2035864U (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 |
| CN103487637A (en) * | 2013-09-30 | 2014-01-01 | 常熟市明阳电器安装工程有限公司 | Electric device abnormal current monitoring system |
| CN105387679A (en) * | 2014-08-29 | 2016-03-09 | 李京岐 | Multi-functional temperature display, control and prompt system |
-
1988
- 1988-08-15 CN CN 88209804 patent/CN2035864U/en not_active Withdrawn
Cited By (4)
| 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 |
| CN103487637A (en) * | 2013-09-30 | 2014-01-01 | 常熟市明阳电器安装工程有限公司 | Electric device abnormal current monitoring system |
| CN105387679A (en) * | 2014-08-29 | 2016-03-09 | 李京岐 | Multi-functional temperature display, control and prompt system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101192751A (en) | Intelligent home electrical appliance and automatic power reclosing protection breaker | |
| CN205883038U (en) | Current foldback circuit and have display screen of this circuit | |
| CN102570198B (en) | Human body induction energy-saving electric shock preventing socket | |
| CN1787308A (en) | Protecting circuit for electrical equipment | |
| CN2035864U (en) | Computerized protector for refrigerator | |
| CN1152459C (en) | High-safety power supply controller | |
| CN1072294A (en) | Multi-function automatic monitor for power consumption | |
| CN2304936Y (en) | Multifunctional wide range constant voltage protector | |
| CN2262116Y (en) | Vacuum control box of oil pumping machine | |
| CN2351767Y (en) | Insulation resistance automatic display device for electric machine | |
| CN2888712Y (en) | Multifunctional household electrical appliance/electric source protector | |
| CN222508770U (en) | Overvoltage protection circuit formed by MOS (metal oxide semiconductor) tube | |
| CN2410731Y (en) | Safety power supply controller | |
| CN1117213A (en) | Full-function protector for electric machine | |
| CN2165557Y (en) | Multifunctional protector for motor | |
| CN2152330Y (en) | Electric monitoring protector for electric appliance computerized safety | |
| CN2208283Y (en) | Five function electronic protector for sigle phase motor | |
| CN2454968Y (en) | Three-phase asynchronous motor protector | |
| CN2140577Y (en) | Intelligent energy saving protector for electric motor | |
| CN2287348Y (en) | Protective energy saving contactor for motor | |
| CN2165555Y (en) | Multifunctional protector for electric appliances | |
| CN2261681Y (en) | Phase-loss protector for ac motor with optical coupling isolating air switch | |
| CN2164604Y (en) | Multi-function safety current limiter | |
| CN2081596U (en) | Electronic thermorelay | |
| CN2165556Y (en) | All-purpose automatic protection switch for motor |
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 |