CN103388579B - The method of the compressor overcurrent protection of air-conditioning equipment and air-conditioning equipment - Google Patents
The method of the compressor overcurrent protection of air-conditioning equipment and air-conditioning equipment Download PDFInfo
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- CN103388579B CN103388579B CN201210141417.0A CN201210141417A CN103388579B CN 103388579 B CN103388579 B CN 103388579B CN 201210141417 A CN201210141417 A CN 201210141417A CN 103388579 B CN103388579 B CN 103388579B
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Abstract
The invention discloses a kind of method and air-conditioning equipment of compressor overcurrent protection of air-conditioning equipment, the method comprises: respond to obtain an alternating current impression electric current to the phase current of compressor power; Be direct current (d.c.) by alternating current impression current conversion; Judge whether the direct current (d.c.) after transforming is greater than predefined value, if so, then starts the overcurrent protection function of compressor.By using the present invention; overcome when the temperature protection action of Screw chiller is not opened; compressor may be in overcurrent for a long time and run; cause the problem of the serious consequence of burning compressor; and then the generation of overcurrent can be prevented by detecting compressor operating current status; well protect compressor, and then extend the working life of air-conditioning equipment.
Description
Technical field
The present invention relates to field of air conditioning, more specifically, relate to a kind of method and air-conditioning equipment of compressor overcurrent protection of air-conditioning equipment.
Background technique
In existing Screw chiller; what the overcurrent protection function of unit relied on is thermorelay; the trigger condition of the protective function of thermorelay is single; only have when the thermorelay temperature that unit over-current and-load causes rises to a certain setting threshold values; protection act just starts; rising due to temperature is a process values; during this, the overcurrent of compressor itself runs and may to exist but unit is not protected; if the situation occurring this compressor overcurrent for a long time and do not protect, the serious consequence of burning compressor can be caused.
In Screw chiller working procedure, after electricity a period of time connected by A.C. contactor, when temperature rises to a certain value, contacting part branch is wherein sticked together, and namely the situation that A.C. contactor burns out occurs.Antiseized connecting plate is exactly before the temperature of A.C. contactor rises to and sticks together, starting protection action, makes A.C. contactor disconnect effect to play protection A.C. contactor.
When the temperature protection action of Screw chiller is not opened, compressor may be in overcurrent for a long time and run, and causes the serious consequence of burning compressor.Further, antiseized connecting plate is arranged separately, and cost is higher, is unfavorable for reducing unit cost.
Summary of the invention
The present invention aims to provide a kind of method and air-conditioning equipment of compressor overcurrent protection of air-conditioning equipment; at least to solve when the temperature protection action of Screw chiller is not opened; compressor may be in overcurrent for a long time and run, and causes the problem of the serious consequence of burning compressor.
According to an aspect of the present invention, provide a kind of method of compressor overcurrent protection of air-conditioning equipment, comprising: respond to obtain an alternating current impression electric current to the phase current of described compressor power; Be direct current (d.c.) by described alternating current impression current conversion; Judge whether the described direct current (d.c.) after transforming is greater than predefined value, if so, then starts the overcurrent protection function of described compressor.
Preferably, the phase current of described compressor power is responded to obtain an alternating current impression electric current and comprises: by current transformer to wherein to respond to mutually, to obtain an alternating current impression electric current in described compressor three phase mains.
Preferably, be that direct current (d.c.) comprises by described alternating current impression current conversion: described alternating current impression electric current is inputed to a current transducer, after the adjusting of described current transducer, mutual inductance, be converted into a direct current (d.c.).
Preferably, judge whether the described direct current (d.c.) after transforming is greater than predefined value, and if so, then the overcurrent protection function starting described compressor comprises: the mainboard described direct current (d.c.) after conversion being exported to described air-conditioning equipment; Described mainboard by the value of described direct current (d.c.) that detects compared with described predefined value; If described DC current values is greater than described predefined value, then start the overcurrent protection function of described compressor.
Preferably, the span of described direct current (d.c.) is 4mA to 24mA.
Preferably, what described air-conditioning equipment adopted is water-cooling screw rod unit.
Preferably, the function that prevents adhesion of A.C. contactor integrated on the mainboard by described air-conditioning equipment carries out the overcurrent protection of described water-cooling screw rod unit.
Preferably; the function that prevents adhesion of A.C. contactor integrated on the mainboard by described air-conditioning equipment carries out the overcurrent protection of described water-cooling screw rod unit; comprise: when described mainboard detects that the temperature of described A.C. contactor rises to the predetermined temperature value occurred before contactor adhesion, disconnect described A.C. contactor.
According to another aspect of the present invention, provide a kind of air-conditioning equipment, comprising: current transformer, the phase current for the compressor power to described air-conditioning equipment is responded to obtain an alternating current impression electric current; Current transducer, input end is connected with the output terminal of described current transformer, for being direct current (d.c.) by described alternating current impression current conversion; Comparison circuit, be positioned on the mainboard of described air-conditioning equipment, its input end is connected with the output terminal of described current transducer, for by transform after direct current (d.c.) compared with predefined value, determine whether according to comparative result the overcurrent protection starting described compressor.
Preferably, the span of described direct current (d.c.) is 4mA to 24mA.
Preferably, what described air-conditioning equipment adopted is water-cooling screw rod unit.
Preferably, the mainboard of described air-conditioning equipment is integrated with the function that prevents adhesion of A.C. contactor.
Present invention employs following method: phase current is converted into direct current (d.c.); and the DC current values obtained and the current value preset are compared; the size of both judgements; if direct current (d.c.) is greater than predefined value; then show that compressor is now in overcurrent working state, then start compressor overcurrent protection function.By using said method; overcome when the temperature protection action of Screw chiller is not opened; compressor may be in overcurrent for a long time and run; cause the problem of the serious consequence of burning compressor; and then the generation of overcurrent can be prevented by detecting compressor operating current status; well protect compressor, and then extend the working life of air-conditioning equipment.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 shows the flow chart of the method for the compressor overcurrent protection of embodiment of the present invention air-conditioning equipment;
Fig. 2 shows the flow chart of the method for the compressor overcurrent protection of preferred embodiment of the present invention air-conditioning equipment;
Fig. 3 shows the structural representation of embodiment of the present invention air-conditioning equipment;
Fig. 4 shows the link position schematic diagram of current transformer in air-conditioning equipment in embodiment of the present invention air-conditioning equipment; And
Fig. 5 shows the link position schematic diagram of current transducer in air-conditioning equipment in embodiment of the present invention air-conditioning equipment.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.
When temperature protection action based on Screw chiller is not opened; compressor may be in overcurrent for a long time and run; cause the problem of the serious consequence of burning compressor; the invention provides a kind of method of compressor overcurrent protection of air-conditioning equipment; its flow process as shown in Figure 1, comprises step S102 to step S106:
Step S102, responds to obtain an alternating current impression electric current to the phase current of compressor power;
Alternating current impression current conversion is direct current (d.c.) by step S104;
Step S106, judges whether the direct current (d.c.) after transforming is greater than predefined value, if so, then starts the overcurrent protection function of compressor.
The present embodiment has used following method: phase current is converted into direct current (d.c.); and the DC current values obtained and the current value preset are compared; the size of both judgements; if direct current (d.c.) is greater than predefined value; then show that compressor is now in overcurrent working state, then start compressor overcurrent protection function.By the method using the present embodiment to provide; overcome when the temperature protection action of Screw chiller is not opened; compressor may be in overcurrent for a long time and run; cause the problem of the serious consequence of burning compressor; and then the generation of overcurrent can be prevented by detecting compressor operating current status; well protect compressor, and then extend the working life of air-conditioning equipment.
The enforcement of step S102 be by current transformer to wherein to respond to mutually in compressor three phase mains, reduce to lower alternating current (a.c.) by the electric current after current transformer by larger electric current, namely obtain an alternating current impression electric current.One of above-mentioned indication is any phase in three phase mains mutually, when passable, a current transformer can be all set for each in three phase mains, then optionally can obtain the induction current of that required phase in varied situations, make it more flexible.
Be that the process of direct current (d.c.) can comprise following process by alternating current impression current conversion in step S104: alternating current impression electric current is inputed to a current transducer, after the adjusting of current transducer, mutual inductance, be converted into a direct current (d.c.).After obtaining direct current (d.c.), perform step S106.Wherein, the span of direct current (d.c.) is 4mA to 24mA.
Step S106 can comprise following process: the mainboard direct current (d.c.) after conversion being exported to air-conditioning equipment; The value of direct current (d.c.) that detects compared with predefined value, is judged the value of direct current (d.c.) and the size of predefined value by mainboard; If DC current values is more than or equal to predefined value, then start the overcurrent protection function of compressor.If the value of direct current (d.c.) is less than predefined value, then show that compressor is in the state of trouble free service, now, continue to perform monitoring (judging the value of direct current (d.c.) and the magnitude relationship of predefined value).
What above-mentioned air-conditioning equipment adopted is water-cooling screw rod unit.In implementation process; the overcurrent protection of water-cooling screw rod unit can be carried out by the function that prevents adhesion of A.C. contactor integrated on the mainboard of air-conditioning equipment; namely, when mainboard detects that the temperature of A.C. contactor rises to the predetermined temperature value occurred before contactor adhesion, A.C. contactor is disconnected.Said process applies the comparison of temperature value, in the process of using air-condition equipment, protects further to compressor.When temperature does not arrive, relatively can judge whether to open overcurrent protection by electric current, when electric current does not exceed predefined value when temperature reaches, temperature protection function can be enabled by C.T again, Screw chiller is protected.
Below in conjunction with preferred embodiment and Fig. 2, above-mentioned mode of execution is described further.
Preferred embodiment
This preferred embodiment relates to the Starting mode of the overcurrent protection function of compressor in water-cooling screw rod unit.
In current Screw chiller, the overcurrent protection of compressor is realized by A.C. contactor, and only have when the temperature of A.C. contactor rises to setting value, compressor overcurrent protection just can start.During this, compressor current may exceed the maximum use electric current of compressor, but ac contactor actuator temperature does not reach protection value, makes compressor operating in over-current and-load state, the of long duration risk that compressor may be had to burn out.
This preferred embodiment provides a kind of method of compressor overcurrent protection of air-conditioning equipment, comprises the step S202 shown in Fig. 2 to step S210:
Step S202, is converted into direct current (d.c.) by the phase current of compressor power.This phase current can be any one in power supply three-phase.
Step S204, judges whether the direct current (d.c.) after transforming is greater than predefined value.If so, then perform step S206, otherwise perform step S208.
Step S206, starts the overcurrent protection function of compressor.
Step S208, continues the temperature of monitoring A.C. contactor, judges whether to reach predefined value.If reach predefined value, then perform step S210, otherwise continue to perform step S202.
Step S210, starts the protective function that prevents adhesion.
The present embodiment is made comparisons by the electric current alarming value in the phase current of direct-detection compressor and mainboard, and when measured current is greater than alarming value, compressor overcurrent protection starts.To be that the compressor in available circuit is a certain add current transformer to specific implementation method mutually, the electric current that current transformer records is recorded by current transducer after adjusting, measured value now, between 4mA ~ 24mA, can detect rear by mainboard and make comparisons with the setting value in mainboard.When measured value is greater than mainboard setting value, compressor protection action launching.
The present embodiment eliminates antiseized connecting plate and independently arranges structure, by its function i ntegration on the mainboard of air-conditioning equipment, when mainboard detect the temperature of A.C. contactor risen to burn out temperature time, mainboard send A.C. contactor disconnect order, A.C. contactor disconnect.The structure be integrated on mainboard also reduces processing cost while playing a protective role equally.
Embodiment one
Detect the electric current of a compressor power three-phase wherein phase; after the induction that ratio is 600:5 current transformer; flow to that alternating current (a.c.) is adjusted by current transducer, mutual inductance; phase current is converted into the direct current (d.c.) of 4mA ~ 24mA; flow to mainboard to detect; the electric current detected and setting electric current are made comparisons by mainboard again, if detect electric current to be greater than setting electric current, compressor protection action launching.The algorithm provided below is only for referencial use, and those skilled in the art can use other algorithms to carry out computing according to actual conditions.
Formula is as follows:
wherein, current transformer induction ratio a=600: 5, current transducer ratio b=5000: 24, in mainboard, compressor overcurrent protection value is set as 10mA.During compressor phase current measured value I=300A, then the electric current that detects of mainboard
now i=12mA > 10mA, compressor overcurrent protection starts.
Embodiment two
Detect the electric current of a compressor power three-phase wherein phase; after the induction that ratio is 800: 5 current transformers; flow to that alternating current (a.c.) is adjusted by current transducer, mutual inductance; phase current is converted into the direct current (d.c.) of 4mA ~ 24mA; flow to mainboard to detect; the electric current detected and setting electric current are made comparisons by mainboard again, if detect electric current to be greater than setting electric current, compressor protection action launching.
Formula is as follows:
wherein, current transformer induction ratio a=600: 5, current transducer ratio b=5000: 24, in mainboard, compressor overcurrent protection value is set as 10mA.During compressor phase current measured value I=225A, then the electric current that detects of mainboard
now i=9mA < 10mA, compressor does not start overcurrent protection function.
Detected the temperature (before carrying out protection act by the antiseized temperature detecting A.C. contactor of winning in succession) of A.C. contactor by mainboard, when the temperature detected reaches protection temperature, mainboard is given an order, start-up temperature protection act.
The embodiment of the present invention additionally provides a kind of air-conditioning equipment, its structural representation (only gives the signal of each annexation) as shown in Figure 3 in schematic diagram, comprise: current transformer 10 (TA), the phase current for the compressor power to air-conditioning equipment is responded to obtain an alternating current impression electric current; Current transducer 20 (TCi), input end is connected with the output terminal of current transformer 10, for being direct current (d.c.) by alternating current impression current conversion; Comparison circuit 30, is positioned on the mainboard of air-conditioning equipment, and its input end is connected with the output terminal of current transducer 20, for by transform after direct current (d.c.) with predefined value compared with, according to comparative result determine whether startup compressor overcurrent protection.Wherein, the span of direct current (d.c.) is 4mA to 24mA.
What above-mentioned air-conditioning equipment adopted is water-cooling screw rod unit.
The mainboard of air-conditioning equipment is also integrated with the function that prevents adhesion of A.C. contactor, when mainboard detects that the temperature of A.C. contactor rises to the predetermined temperature value occurred before contactor adhesion, disconnects A.C. contactor.This function i ntegration arranging antiseized connecting plate independence arranged, on mainboard, reduces unit cost.
In specific implementation process, current transformer 10 is arranged respectively as shown in Figure 4 and Figure 5 with current transducer 20.Fig. 4 shows the setting position of current transformer 10 at air-conditioning equipment, and can be arranged in three phase mains arbitrary goes up mutually for TA, and during air-conditioning work, electric current flows through current transformer 10, obtains alternating current impression electric current.Illustrate only the setting position of current transformer 10 in Fig. 4, after obtaining alternating current impression electric current, this electric current is sent into current transducer 20, and the setting position of current transducer 20 as shown in Figure 5.Wherein, Fig. 4 and Fig. 5 is connected with B line by A line.In Fig. 4, treated electric current delivers to the current transducer 20 in Fig. 5 by A line and B line, is direct current (d.c.) by current conversion, and is compared by this electric current feeding comparison circuit 30.In figure, remaining part is the internal structure of air-conditioning equipment, is not described in detail herein, those skilled in the art can according to the signal in Fig. 4 and Fig. 5 clear and definite current transformer 10 and current transducer 20 in the position of air-conditioning equipment.Above-mentioned comparison circuit 30 can independently be arranged on mainboard, also can combine with the internal structure of mainboard, by the interrelated function realizing comparison circuit of function, is not described in detail herein.
As can be seen from the above description, the above embodiments of the present invention achieve following technique effect:
Over-current and-load is there is in the embodiment of the present invention in compressor During Process of Long-term Operation; but unit does not carry out the phenomenon protected; increase a kind of electric current detecting method; the running current of compressor is limited to below a certain setting value; play the object of protection compressor; namely detect compressor operating current status, prevent overcurrent, play the effect of protection compressor.On the other hand, also cancel antiseized connecting plate, and the function i ntegration that will prevent adhesion is to mainboard, is realized by mainboard, reduces unit cost.By the utilization of the present embodiment, well protect compressor, and then extend the working life of air-conditioning equipment.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general computing device, they can concentrate on single computing device, or be distributed on network that multiple computing device forms, alternatively, they can realize with the executable program-code of computing device, thus they storages can be performed by computing device in the storage device, or they are made into each integrated circuit module respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a method for the compressor overcurrent protection of air-conditioning equipment, is characterized in that, comprising:
Respond to obtain an alternating current impression electric current to the phase current of described compressor power;
Be direct current (d.c.) by described alternating current impression current conversion;
Judge whether the described direct current (d.c.) after transforming is greater than predefined value, if so, then starts the overcurrent protection function of described compressor,
Wherein, what described air-conditioning equipment adopted is water-cooling screw rod unit, and the function that prevents adhesion of A.C. contactor integrated on the mainboard by described air-conditioning equipment carries out the overcurrent protection of described water-cooling screw rod unit.
2. method according to claim 1, is characterized in that, responds to obtain an alternating current impression electric current comprise the phase current of described compressor power:
By current transformer to wherein to respond to mutually, to obtain an alternating current impression electric current in described compressor three phase mains.
3. method according to claim 2, is characterized in that, is that direct current (d.c.) comprises by described alternating current impression current conversion:
Described alternating current impression electric current is inputed to a current transducer, after the adjusting of described current transducer, mutual inductance, is converted into a direct current (d.c.).
4. method according to claim 3, is characterized in that, judges whether the described direct current (d.c.) after transforming is greater than predefined value, and if so, then the overcurrent protection function starting described compressor comprises:
Described direct current (d.c.) after conversion is exported to the mainboard of described air-conditioning equipment;
Described mainboard by the value of described direct current (d.c.) that detects compared with described predefined value;
If described DC current values is greater than described predefined value, then start the overcurrent protection function of described compressor.
5. method according to claim 3, is characterized in that, the span of described direct current (d.c.) is 4mA to 24mA.
6. method according to claim 1, is characterized in that, the function that prevents adhesion of A.C. contactor integrated on the mainboard by described air-conditioning equipment carries out the overcurrent protection of described water-cooling screw rod unit, comprising:
When described mainboard detects that the temperature of described A.C. contactor rises to the predetermined temperature value occurred before contactor adhesion, disconnect described A.C. contactor.
7. an air-conditioning equipment, is characterized in that, comprising:
Current transformer, the phase current for the compressor power to described air-conditioning equipment is responded to obtain an alternating current impression electric current;
Current transducer, input end is connected with the output terminal of described current transformer, for being direct current (d.c.) by described alternating current impression current conversion;
Comparison circuit, be positioned on the mainboard of described air-conditioning equipment, its input end is connected with the output terminal of described current transducer, for by transform after direct current (d.c.) compared with predefined value, determine whether according to comparative result the overcurrent protection starting described compressor,
Wherein, what described air-conditioning equipment adopted is water-cooling screw rod unit, the mainboard of described air-conditioning equipment is integrated with the function that prevents adhesion of A.C. contactor.
8. air-conditioning equipment according to claim 7, is characterized in that, the span of described direct current (d.c.) is 4mA to 24mA.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210141417.0A CN103388579B (en) | 2012-05-08 | 2012-05-08 | The method of the compressor overcurrent protection of air-conditioning equipment and air-conditioning equipment |
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| CN201210141417.0A CN103388579B (en) | 2012-05-08 | 2012-05-08 | The method of the compressor overcurrent protection of air-conditioning equipment and air-conditioning equipment |
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| CN103388579B true CN103388579B (en) | 2016-03-23 |
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| CN105370557B (en) * | 2014-08-28 | 2018-06-22 | 上海海立电器有限公司 | The protection system of frequency-changeable compressor |
| CN105781953B (en) * | 2014-12-25 | 2018-06-12 | Tcl空调器(中山)有限公司 | Prevent control method, controller and the air conditioner of overload of compressor |
| CN105864007A (en) * | 2015-01-23 | 2016-08-17 | 广东美的制冷设备有限公司 | Protection device for compressor control circuit and control method thereof |
| CN106594990A (en) * | 2016-12-15 | 2017-04-26 | 广东美的暖通设备有限公司 | Control method and device for household appliances and household appliances |
| CN107100833A (en) * | 2017-05-24 | 2017-08-29 | 泰州年糕房车技术有限公司 | A kind of compressor protector |
| CN107192022A (en) * | 2017-06-16 | 2017-09-22 | Tcl空调器(中山)有限公司 | Air conditioner and air-conditioner control method, device and storage medium |
| CN107565507B (en) * | 2017-10-09 | 2019-09-10 | 珠海格力电器股份有限公司 | Compressor overcurrent protective device, method and electrical equipment |
| CN111181133B (en) * | 2020-01-09 | 2020-12-11 | 珠海格力电器股份有限公司 | Overcurrent protection method and device, storage medium and air conditioner |
| CN112193018B (en) * | 2020-10-19 | 2022-01-28 | 珠海格力电器股份有限公司 | Vehicle control method, device and system |
| CN113035645B (en) * | 2021-04-19 | 2023-03-21 | 宁波奥克斯电气股份有限公司 | Anti-adhesion contactor, control method thereof and air conditioner |
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