CN201126959Y - Protective circuit capable of preventing compressor from demagnetization - Google Patents
Protective circuit capable of preventing compressor from demagnetization Download PDFInfo
- Publication number
- CN201126959Y CN201126959Y CNU2007201904691U CN200720190469U CN201126959Y CN 201126959 Y CN201126959 Y CN 201126959Y CN U2007201904691 U CNU2007201904691 U CN U2007201904691U CN 200720190469 U CN200720190469 U CN 200720190469U CN 201126959 Y CN201126959 Y CN 201126959Y
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- China
- Prior art keywords
- compressor
- demagnetization
- resistance
- protective circuit
- utility
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- 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 - Lifetime
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Abstract
The utility model relates to compressor field, which discloses a protective circuit for avoiding the compressor from demagnetization. The protective circuit comprises a comparer and a control chip and serially connected resistor R1, R2; the resistor R1 is connected to the power source; R2 is connected to the ground; the resistance ratio of R1 and R2 is not less than (U/R[S]I[DCOC])-1, wherein U is the voltage at two ends of the R1 and R2; Rs is the resistance value of the concrete resistance of a compressor drive module; I[DCOC]is the maximum demagnetization current of the compressor; The input end of the comparer is connected to r2; another end is connected to the concrete resistance; the output end is connected to the chip. The utility model solves the problem of demagnetization while constant high current of the compressor and assures the normal operation of the compressor; the utility model has the characteristics of simple structure and low cost.
Description
Technical field
The utility model relates to compressor field, particularly relates to a kind of protective circuit that prevents the compressor demagnetization.
Background technology
Enhancing along with people's awareness of saving energy, use the air conditioner of DC frequency-changeable compressor and come into huge numbers of families gradually, and the magnetic raw material that compressor adopts now are the magnetic materials such as compound of ferrite lattice, rear earth element nd and iron, boron, when these materials just the phenomenon of demagnetizing can occur during at the maximum current that can bear by it.
In order to prevent that demagnetization from appearring in compressor; the size that the developer has designed by Control current prevents the compressor demagnetization; because the reaction time of its protection is longer relatively; but the demagnetization of compressor is to take place moment; thereby making so defencive function just plays the phase current size that detects compressor increases various frequency reducing points and plays the frequency that reduces compressor and reduce phase current in the program, and can not play a protective role moment during the big electric current of appearance suddenly when compressor.When making compressor big electric current occur for some reason, demagnetization just can appear in compressor, damages compressor.
Along with people's perfect gradually to the direct current compressor Drive Control Technique, and the understanding of compressor material, people can test out the demagnetization current of compressor accurately, therefore, according to the size of cement resistor electric current on the driven compressor module, come compressor is controlled.When the electric current on the module was excessive, driver module quit work, and sent F0 signal (fault-signal), thereby reached the purpose that prevents the compressor demagnetization.Utilize the voltage of cement resistor to realize driving to compressor; but in selecting the process of cement resistor more be for single-chip microcomputer in the convenience of program internal calculation; thereby the driver of same version may correspondingly use on the compressor of a lot of models; this problem just occurred: for the compressor of a certain model; the demagnetization current that compressor can occur is less than the protective current by cement resistor on the control module; when this happens; thereby play the frequency that reduces compressor and reduce phase current by increasing various frequency reducing points; but can not play rapid protective effect because reaction is slow; and the protection of playing by the cement resistor protective circuit is big owing to its de-magnetization point of sending the current ratio compressor of fault-signal FO flows, so the purpose that prevents the compressor demagnetization is not played in above-mentioned two kinds of guard methods; cause the damage of compressor.
The utility model content
The purpose of this utility model provides a kind of simple, practical protective circuit, and a kind of protective circuit that prevents the compressor demagnetization particularly is provided.
For achieving the above object, the technical solution of the utility model provides a kind of protective circuit that prevents the compressor demagnetization, comprises comparator and control chip; also comprise the resistance R 1, the R2 that are connected in series; described resistance R 1 is connected with power supply, R2 ground connection, and the resistance ratio of R1 and R2 is not less than
Wherein, U is the voltage at described resistance R 1, R2 two ends in the formula, and Rs is the resistance of the cement resistor of driven compressor module, I
DCOCBe the maximum demagnetization current of compressor; Input one end of described comparator is connected with R2, and the other end is connected with described cement resistor, and output is connected with control chip.
Wherein, also comprise capacitor C 1, described C1 is connected in parallel on described resistance R 2 two ends.
Wherein, the voltage U at described resistance R 1, R2 two ends is+5V.
Wherein, also comprise capacitor C 2, described C2 one end ground connection, the other end is connected with the output of described comparator.
Above-mentioned utility model technical scheme only is an optimal technical scheme of the present utility model; have following advantage: the technical program is by adopting two resistance series connection dividing potential drops; when the voltage on the cement resistor surpasses the voltage of design; control chip will be protected compressor; thereby prevented that compressor from demagnetizing, and protected compressor when instantaneous large-current occurs.
Description of drawings
Fig. 1 is a kind of circuit principle structure schematic diagram that prevents the protective circuit of compressor demagnetization of the utility model embodiment.
Embodiment
Below in conjunction with drawings and Examples, embodiment of the present utility model is described in further detail.Following examples only are used for the technical solution of the utility model more clearly is described, and can not limit protection range of the present utility model with this.
Fig. 1 is a kind of circuit principle structure schematic diagram that prevents the protective circuit of compressor demagnetization of the utility model embodiment.As shown in Figure 1, resistance R 1, R2 series connection, resistance R 1 is connected with power supply, resistance R 2 ground connection, the voltage U between resistance R 1, the R2 are+5V that one end of comparator input terminal is connected with resistance R 2, the other end is connected with the cement resistor of compressor control module, output is connected with control chip MCU, at resistance R 2 two ends shunt capacitance C1, inserts capacitor C 2 between the output of control chip MCU and ground.
Present embodiment is realized protection by voltage on the comparison resistance R2 that comes that uses the comparator that has existed and the magnitude of voltage on the cement resistor.When electric current moment of compressor becomes big; voltage on the cement resistor surpasses the magnitude of voltage on the resistance R 2, and comparator is transferred to control chip MCU to signal, stops the output of the driver module of compressor after control chip MCU detects; compressor shuts down, thereby the protection press prevents demagnetization.The voltage that wherein is added on the R2 is:
By the detected voltage of cement resistor is Vsoc, and wherein its value size is
V
soc＝R
s·I
DCOC
Wherein, Rs is the resistance of cement resistor;
I
DCOCBe the maximum demagnetization current of compressor.
When equating when the voltage on the detected R2 with by the voltage that cement resistor detects, i.e. Vsoc=Vocref has following formula:
The ratio that can be drawn R1 and R2 by following formula is:
Knowing the size of Rs, just can calculate the numerical values recited of R1/R2, still, should be pointed out that the numerical value of the R1/R2 that is obtained by following formula only is priority scheme, because I
DCOCBe the maximum demagnetization current of compressor, so, as long as the ratio of R1 and R2 is not less than
Can realize the purpose of compressor demagnetization protection.But consider the operate as normal needs of compressor, getting the maximum demagnetization current of compressor is that design current is an optimal case.Therefore, select the resistance ratio of suitable R 1 and R2, can realize the purpose of compressor demagnetization protection.
As can be seen from the above embodiments, the utility model embodiment has increased by two resistance that resistance ratio is suitable, has just realized preventing the purpose of compressor demagnetization.Have simple in structure, characteristics that cost is low, and can realize preventing the purpose of compressor demagnetization at the compressor of different model.
The above only is a preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the utility model know-why; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (4)
1, a kind of protective circuit that prevents the compressor demagnetization comprises comparator and control chip, it is characterized in that also comprise the resistance R 1, the R2 that are connected in series, described resistance R 1 is connected with power supply, R2 ground connection, and the resistance ratio of R1 and R2 is not less than
Wherein, U is the voltage at described resistance R 1, R2 two ends in the formula, and Rs is the resistance of the cement resistor of driven compressor module, and IDCOC is the maximum demagnetization current of compressor;
Input one end of described comparator is connected with R2, and the other end is connected with described cement resistor, and output is connected with control chip.
2, a kind of protective circuit that prevents the compressor demagnetization as claimed in claim 1 is characterized in that also comprise capacitor C 1, described C1 is connected in parallel on described resistance R 2 two ends.
3, a kind of protective circuit that prevents the compressor demagnetization as claimed in claim 1 is characterized in that the voltage U at described resistance R 1, R2 two ends is+5V.
4, a kind of protective circuit that prevents the compressor demagnetization as claimed in claim 1 is characterized in that, also comprises capacitor C 2, described C2 one end ground connection, and the other end is connected with the output of described comparator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201904691U CN201126959Y (en) | 2007-11-29 | 2007-11-29 | Protective circuit capable of preventing compressor from demagnetization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201904691U CN201126959Y (en) | 2007-11-29 | 2007-11-29 | Protective circuit capable of preventing compressor from demagnetization |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201126959Y true CN201126959Y (en) | 2008-10-01 |
Family
ID=40000423
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201904691U Expired - Lifetime CN201126959Y (en) | 2007-11-29 | 2007-11-29 | Protective circuit capable of preventing compressor from demagnetization |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201126959Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102761103A (en) * | 2012-02-24 | 2012-10-31 | 珠海格力电器股份有限公司 | Compressor demagnetization protection circuit and demagnetization protection method and air conditioner |
| CN103124064A (en) * | 2011-11-18 | 2013-05-29 | 广东美芝制冷设备有限公司 | Protection method for preventing frequency conversion compressor from demagnetization |
| CN103501147A (en) * | 2013-09-23 | 2014-01-08 | 广东美芝精密制造有限公司 | Method for preventing compressor from demagnetizing |
| CN104389775A (en) * | 2014-11-03 | 2015-03-04 | 宁波奥克斯空调有限公司 | Method for protecting air conditioner compressor in case of abnormal power failure |
| CN104753188A (en) * | 2013-12-30 | 2015-07-01 | 丹佛斯（天津）有限公司 | Motor, compressor and method for controlling motor or compressor |
-
2007
- 2007-11-29 CN CNU2007201904691U patent/CN201126959Y/en not_active Expired - Lifetime
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103124064A (en) * | 2011-11-18 | 2013-05-29 | 广东美芝制冷设备有限公司 | Protection method for preventing frequency conversion compressor from demagnetization |
| CN104617554A (en) * | 2011-11-18 | 2015-05-13 | 广东美芝制冷设备有限公司 | Protection method for preventing inverter compressor against demagnetization |
| CN103124064B (en) * | 2011-11-18 | 2015-07-01 | 广东美芝制冷设备有限公司 | Protection method for preventing frequency conversion compressor from demagnetization |
| CN102761103A (en) * | 2012-02-24 | 2012-10-31 | 珠海格力电器股份有限公司 | Compressor demagnetization protection circuit and demagnetization protection method and air conditioner |
| CN102761103B (en) * | 2012-02-24 | 2013-05-29 | 珠海格力电器股份有限公司 | Compressor demagnetization protection circuit and demagnetization protection method and air conditioner |
| WO2013123820A1 (en) * | 2012-02-24 | 2013-08-29 | 珠海格力电器股份有限公司 | Compressor demagnetization protection circuit, demagnetization protection method and air conditioner |
| CN103501147A (en) * | 2013-09-23 | 2014-01-08 | 广东美芝精密制造有限公司 | Method for preventing compressor from demagnetizing |
| CN103501147B (en) * | 2013-09-23 | 2016-04-06 | 广东美芝精密制造有限公司 | Prevent the method that compressor demagnetizes |
| CN104753188A (en) * | 2013-12-30 | 2015-07-01 | 丹佛斯（天津）有限公司 | Motor, compressor and method for controlling motor or compressor |
| CN104753188B (en) * | 2013-12-30 | 2018-01-23 | 丹佛斯（天津）有限公司 | The method of motor, compressor and controlled motor or compressor |
| US10090793B2 (en) | 2013-12-30 | 2018-10-02 | Danfoss (Tianjin) Ltd. | Electric motor, compressor, and method for controlling electric motor or compressor |
| CN104389775A (en) * | 2014-11-03 | 2015-03-04 | 宁波奥克斯空调有限公司 | Method for protecting air conditioner compressor in case of abnormal power failure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20081001 |