CN108361183B - A kind of current protection control method and device - Google Patents
A kind of current protection control method and device Download PDFInfo
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- CN108361183B CN108361183B CN201810140447.7A CN201810140447A CN108361183B CN 108361183 B CN108361183 B CN 108361183B CN 201810140447 A CN201810140447 A CN 201810140447A CN 108361183 B CN108361183 B CN 108361183B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/10—Other safety measures
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Control Of Ac Motors In General (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The present invention provides a kind of current protection control method and devices, this method comprises: the first electric current and the first operating frequency when determining a upper monitoring moment；The second electric current and room temperature when determining the current monitor moment；Current change quantity is calculated according to the first electric current and the second electric current, room temperature and preset set temperature when according to the current monitor moment determine that frequency changes amplitude；According to the first electric current, current change quantity, the second electric current, frequency correction value is determined；According to the first operating frequency, frequency variation amplitude and frequency correction value, the second operating frequency is calculated；Operating frequency when controlling the current monitor moment is the second operating frequency, and using the current monitor moment as a upper monitoring moment, so circulation is executed.It is periodically based on curent change speed, the operating frequency of corresponding adjustment compressor avoids curent change from overshooting and cause compressor shutdown so that compressor operation is stablized.Therefore, this programme can alleviate compressor halting problem repeatedly.
Description
Technical field
The present invention relates to field of computer technology, in particular to a kind of current protection control method and device.
Background technique
The compressor operation frequency range of frequency conversion electric appliance is usually wider.For example, the operating model of market major part convertible frequency air-conditioner
It is trapped among 10-120Hz.Due to compressor operation wide frequency range, frequency conversion electric appliance working environment complexity and longevity of service, therefore becoming
During frequency electrical work, curent change range is usually larger.For compressor, control circuit and the first device for protecting frequency conversion electric appliance
Part needs to control the input current of frequency conversion electric appliance within the safe range operated for a long time.
Currently, corresponding control measure can be taken when current value exceeds preset range with real-time detection electric current.Than
Such as, compressor operation frequency can be reduced, if or even the current value still over range after reducing frequency, can be with close compressor.
But this implementation easily causes compressor halting problem repeatedly.
Summary of the invention
The present invention provides a kind of current protection control method and devices, can alleviate compressor halting problem repeatedly.
In order to achieve the above object, the present invention is achieved through the following technical solutions:
On the one hand, the present invention provides a kind of current protection control methods, comprising:
S1: the first electric current and the first operating frequency when a monitoring moment are determined；
S2: when determining to reach periodical monitoring condition, the second electric current and Indoor Temperature when the current monitor moment are determined
Degree；
S3: according to first electric current and second electric current, calculating current variable quantity, and according to the current monitor
Room temperature and preset set temperature when the moment determine that frequency changes amplitude；
S4: according to first electric current, the current change quantity, second electric current, frequency correction value is determined；
S5: according to first operating frequency, frequency variation amplitude and the frequency correction value, the second operating is calculated
Frequency；
S6: operating frequency when controlling the current monitor moment is second operating frequency, and with the current prison
The moment was controlled as a upper monitoring moment, executes S1.
Further, before the S1 further include:
A1: outdoor temperature and indoor temperature and the set temperature when according to the booting moment determine initial operation frequency
Rate and maximum allowable operating frequency；
A2: through software scans, judging whether shut down because of overcurrent protection when a upper shutdown moment, if so, A3 is executed,
Otherwise, A4 is executed；
A3: whether third operating frequency when judging the upper shutdown moment is greater than the initial operation frequency, if
It is to execute A4, otherwise, executes A5；
A4: judging whether the initial operation frequency is greater than the maximum allowable operating frequency, if so, determining booting operating
Frequency is equal to the maximum allowable operating frequency, and executes A6, otherwise, it determines booting operating frequency is equal to the initial operation frequency
Rate, and execute A6；
A5: judging whether the third operating frequency is greater than the maximum allowable operating frequency, if so, determining booting operating
Frequency is equal to the maximum allowable operating frequency, and executes A6, otherwise, it determines booting operating frequency is equal to third operating frequency
Rate, and the maximum allowable operating frequency is updated, so that the maximum allowable operating frequency is equal to the third operating frequency, and
Execute A6；
A6: operating frequency when control booting moment is the booting operating frequency determined, and when with the booting
It carves and was used as a upper monitoring moment, execute S1.
Further, before the S6 further include: judge second operating frequency whether be greater than it is predetermined most
It is big to allow operating frequency, if so, second operating frequency is updated, so that second operating frequency is equal to described maximum allowable
Operating frequency, and S6 is executed, otherwise, execute S6.
Further, this method further include: outdoor temperature and indoor temperature when according to the booting moment determines frequency limit electricity
Stream, shuts down electric current at frequency reducing electric current；
After the S5 further include:
B1: judging whether second electric current is greater than the frequency limit electric current, if so, executing B2, otherwise, executes S6；
B2: judging whether second operating frequency is greater than predetermined maximum allowable operating frequency, if so, updating institute
The second operating frequency is stated, so that second operating frequency is equal to the maximum allowable operating frequency, and executes B3, otherwise, more
The new maximum allowable operating frequency, so that the maximum allowable operating frequency is equal to second operating frequency, and executes B3；
B3: judging whether second electric current is greater than the frequency reducing electric current, if so, according to second electric current, the electricity
Variable quantity, the shutdown electric current are flowed, determines frequency reducing amplitude, and according to second operating frequency and the frequency reducing amplitude, is calculated
4th operating frequency, and B4 is executed, otherwise, execute S6；
B4: judging whether the 4th operating frequency is greater than the maximum allowable operating frequency, if so, updating the described 4th
Operating frequency so that the 4th operating frequency is equal to the maximum allowable operating frequency, and executes B5, otherwise, executes S6；
B5: judging whether second electric current is greater than the shutdown electric current, if so, close compressor and the current stream of end
Otherwise journey executes S6.
Further, in the S3, the current change quantity meets formula one；
In the S5, second operating frequency meets formula two；
The formula one includes: △ I=Ii-Ii-1
The formula two includes: Fi=Fi-1+△F1+△F2
Wherein, △ I is the current change quantity, IiFor second electric current, Ii-1For first electric current, FiIt is described
Two operating frequencies, Fi-1For first operating frequency, △ F1Change amplitude, △ F for the frequency2For the frequency correction value.
On the other hand, the present invention provides a kind of current protection control apparatus, comprising:
First determination unit, for determining the first electric current and the first operating frequency when a upper monitoring moment；
Second determination unit, for when determining to reach periodical monitoring condition, determining when the current monitor moment
Two electric currents and room temperature；
First processing units, for according to first electric current and second electric current, calculating current variable quantity, Yi Jigen
Room temperature and preset set temperature when according to the current monitor moment determine that frequency changes amplitude；According to described first
Electric current, the current change quantity, second electric current, determine frequency correction value；According to first operating frequency, the frequency
Change amplitude and the frequency correction value, calculates the second operating frequency；
The second processing unit is second operating frequency for operating frequency when controlling the current monitor moment,
And using the current monitor moment as a upper monitoring moment, first determination unit was triggered.
Further, current protection control apparatus further include: third processing unit, room when for according to the booting moment
Outer temperature and room temperature and the set temperature, determine initial operation frequency and maximum allowable operating frequency；It is swept through software
It retouches, judges whether shut down because of overcurrent protection when a upper shutdown moment, if so, triggering fourth processing unit, otherwise, triggering
5th processing unit；
Whether the fourth processing unit is greater than institute for third operating frequency when judging the upper shutdown moment
Initial operation frequency is stated, if so, otherwise triggering the 5th processing unit triggers the 6th processing unit；
5th processing unit, for judging whether the initial operation frequency is greater than the maximum allowable operating frequency
Rate if so, determining that booting operating frequency is equal to the maximum allowable operating frequency, and triggers the 7th processing unit, otherwise, it determines
The operating frequency that is switched on is equal to the initial operation frequency, and triggers the 7th processing unit；
6th processing unit, for judging whether the third operating frequency is greater than the maximum allowable operating frequency
Rate if so, determining that booting operating frequency is equal to the maximum allowable operating frequency, and triggers the 7th processing unit, otherwise,
It determines that booting operating frequency is equal to the third operating frequency, and updates the maximum allowable operating frequency, so that the maximum
Allow operating frequency to be equal to the third operating frequency, and triggers the 7th processing unit；
7th processing unit is the booting operating frequency determined for operating frequency when controlling the booting moment
Rate, and using the booting moment as a upper monitoring moment, trigger first determination unit.
Further, it is predetermined to be also used to judge whether second operating frequency is greater than for described the second processing unit
Maximum allowable operating frequency, if so, second operating frequency is updated, so that second operating frequency is equal to the maximum
Allow operating frequency, and using the current monitor moment as a upper monitoring moment, and triggers first determination unit, it is no
Then, using the current monitor moment as a upper monitoring moment, first determination unit was triggered.
Further, current protection control apparatus further include: the 8th processing unit, room when for according to the booting moment
Outer temperature and room temperature determine frequency limit electric current, frequency reducing electric current, shut down electric current；It is described to judge whether second electric current is greater than
Frequency limit electric current, if so, otherwise the 9th processing unit of triggering triggers described the second processing unit；
9th processing unit, for judging whether second operating frequency is greater than predetermined maximum allowable fortune
Turn frequency, if so, second operating frequency is updated, so that second operating frequency is equal to the maximum allowable operating frequency
Rate, and the tenth processing unit is triggered, otherwise, the maximum allowable operating frequency is updated, so that the maximum allowable operating frequency
Equal to second operating frequency, and trigger the tenth processing unit；
Tenth processing unit, for judging whether second electric current is greater than the frequency reducing electric current, if so, according to institute
State the second electric current, the current change quantity, the shutdown electric current, determine frequency reducing amplitude, and according to second operating frequency and
The frequency reducing amplitude calculates the 4th operating frequency, and triggers the 11st processing unit and otherwise trigger described the second processing unit；
11st processing unit, for judging whether the 4th operating frequency is greater than the maximum allowable operating frequency
Rate, if so, the 4th operating frequency is updated, so that the 4th operating frequency is equal to the maximum allowable operating frequency, and
The 12nd processing unit is triggered, otherwise, triggers described the second processing unit；
12nd processing unit, for judging whether second electric current is greater than the shutdown electric current, if so, closing
Compressor simultaneously terminates, and otherwise, triggers described the second processing unit.
Further, the first processing units utilize public affairs specifically for calculating the current change quantity using formula one
Formula two calculates second operating frequency；
The formula one includes: △ I=Ii-Ii-1
The formula two includes: Fi=Fi-1+△F1+△F2
Wherein, △ I is the current change quantity, IiFor second electric current, Ii-1For first electric current, FiIt is described
Two operating frequencies, Fi-1For first operating frequency, △ F1Change amplitude, △ F for the frequency2For the frequency correction value.
The present invention provides a kind of current protection control method and devices, this method comprises: determining a upper monitoring moment
When the first electric current and the first operating frequency；The second electric current and room temperature when determining the current monitor moment；According to the first electricity
Stream and the second electric current calculate current change quantity, and the room temperature and preset set temperature when according to the current monitor moment determine frequency
Rate changes amplitude；According to the first electric current, current change quantity, the second electric current, frequency correction value is determined；According to the first operating frequency,
Frequency changes amplitude and frequency correction value, calculates the second operating frequency；Operating frequency when controlling the current monitor moment is second
Operating frequency, and using the current monitor moment as a upper monitoring moment, so circulation executes.It is periodically fast based on curent change
Slowly, the operating frequency of corresponding adjustment compressor avoids curent change from overshooting and cause compressor and stop so that compressor operation is stablized
Machine.Therefore, the present invention can alleviate compressor halting problem repeatedly.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is the present invention
Some embodiments for those of ordinary skill in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is a kind of flow chart for current protection control method that one embodiment of the invention provides；
Fig. 2 is the flow chart for another current protection control method that one embodiment of the invention provides；
Fig. 3 is a kind of schematic diagram for current protection control apparatus that one embodiment of the invention provides；
Fig. 4 is the schematic diagram for another current protection control apparatus that one embodiment of the invention provides.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments, based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
As shown in Figure 1, may comprise steps of the embodiment of the invention provides a kind of current protection control method:
Step 101: determining the first electric current and the first operating frequency when a monitoring moment.
Step 102: the second electric current and room when determining to reach periodical monitoring condition, when determining the current monitor moment
Interior temperature.
Step 103: according to first electric current and second electric current, calculating current variable quantity, and being worked as according to described
Room temperature and preset set temperature when the preceding monitoring moment determine that frequency changes amplitude.
Step 104: according to first electric current, the current change quantity, second electric current, determining frequency correction value.
Step 105: according to first operating frequency, the frequency variation amplitude and frequency correction value, calculating the
Two operating frequencies.
Step 106: operating frequency when controlling the current monitor moment is second operating frequency, and is worked as with described
The preceding monitoring moment as a upper monitoring moment, executed step 101.
The embodiment of the invention provides a kind of current protection control methods, determine the first electric current when a monitoring moment
With the first operating frequency；The second electric current and room temperature when determining the current monitor moment；According to the first electric current and the second electric current
Calculating current variable quantity, room temperature and preset set temperature when according to the current monitor moment determine that frequency changes amplitude；
According to the first electric current, current change quantity, the second electric current, frequency correction value is determined；Change amplitude according to the first operating frequency, frequency
With frequency correction value, the second operating frequency is calculated；Operating frequency when controlling the current monitor moment is the second operating frequency, and with
The current monitor moment executed as a upper monitoring moment, so circulation.Periodically it is based on curent change speed, corresponding adjustment pressure
The operating frequency of contracting machine avoids curent change from overshooting and cause compressor shutdown so that compressor operation is stablized.Therefore, this hair
Bright embodiment can alleviate compressor halting problem repeatedly.
More common, current protection control method described in the embodiment of the present invention can be adapted for this change of convertible frequency air-conditioner
Frequency electric appliance, in this way, above-mentioned electric current can with for convertible frequency air-conditioner work when complete machine input current, above-mentioned operating frequency can with for
The operating frequency of convertible frequency air-conditioner inner compressor.For ease of description, description of Related Art can be carried out by object of convertible frequency air-conditioner
Explanation.
In an embodiment of the invention, above-mentioned periodical monitoring condition can be, opposite with default supervision interval duration
The monitoring moment answered.For example, being based on a upper monitoring moment t when default supervision interval when a length of 3mini-1It is delayed after 3min, i.e.,
Reach current monitor moment ti=ti-1+3。
In an embodiment of the invention, more commonly, above-mentioned current change quantity can be the first electric current and the second electricity
Difference between stream.
Therefore, in an embodiment of the invention, in the step 103, the current change quantity meets following formula
(1)；
△ I=Ii-Ii-1 (1)
Wherein, △ I is the current change quantity, IiFor second electric current, Ii-1For first electric current.
In an embodiment of the invention, can be according to preset empirical value, for example can accordingly be tabulated in advance by inquiring
Lattice, to determine corresponding frequency variation amplitude according to room temperature and set temperature.Similarly, frequency correction value equally can be with
It is determined and tabling look-up.
In detail, in convertible frequency air-conditioner operational process, at the different monitoring moment, the indexs such as electric current, operating frequency, room temperature
Constantly variation.Electric current, operating frequency, room temperature, set temperature when based on the nearest two monitoring moment, available frequency become
Change amplitude and frequency correction value, the operating frequency progress that the two values can be current to compressor is appropriate to be optimized and revised, to reach
To the effect for guaranteeing compressor stable operation.
In an embodiment of the invention, in the step 105, second operating frequency meets following formula (2)；
Fi=Fi-1+△F1+△F2 (2)
Wherein, FiFor second operating frequency, Fi-1For first operating frequency, △ F1Change width for the frequency
Value, △ F2For the frequency correction value.
In this way, the second operating frequency can control compressor current with for the operating frequency after optimizing and revising
Operating frequency when monitoring the moment is second operating frequency, to complete this current protection control loop, and is entered next
A current protection control loop needs to execute above-mentioned steps 101 again to step 106.
In detail, based on the design principle of overcurrent protection, when the electric current of convertible frequency air-conditioner at any one time reaches overcurrent
When protecting corresponding predetermined current threshold, compressor closing can control, so that convertible frequency air-conditioner is shut down.In this way, working as convertible frequency air-conditioner
When being switched on each time, situation can be shut down according to the last time, to determine compressor operation frequency when booting.
In an embodiment of the invention, in order to illustrate a kind of side of being able to achieve of compressor operation frequency when control booting
Formula, so, further comprise before the step 101:
A1: outdoor temperature and indoor temperature and the set temperature when according to the booting moment determine initial operation frequency
Rate and maximum allowable operating frequency；
A2: through software scans, judging whether shut down because of overcurrent protection when a upper shutdown moment, if so, A3 is executed,
Otherwise, A4 is executed；
A3: whether third operating frequency when judging the upper shutdown moment is greater than the initial operation frequency, if
It is to execute A4, otherwise, executes A5；
A4: judging whether the initial operation frequency is greater than the maximum allowable operating frequency, if so, determining booting operating
Frequency is equal to the maximum allowable operating frequency, and executes A6, otherwise, it determines booting operating frequency is equal to the initial operation frequency
Rate, and execute A6；
A5: judging whether the third operating frequency is greater than the maximum allowable operating frequency, if so, determining booting operating
Frequency is equal to the maximum allowable operating frequency, and executes A6, otherwise, it determines booting operating frequency is equal to third operating frequency
Rate, and the maximum allowable operating frequency is updated, so that the maximum allowable operating frequency is equal to the third operating frequency, and
Execute A6；
A6: operating frequency when control booting moment is the booting operating frequency determined, and when with the booting
It carves and was used as a upper monitoring moment, execute S1.
In the embodiment of the present invention, initial operation frequency is F1, maximum allowable operating frequency is Fmax, third operating frequency is
F0.Wherein, the required operating frequency reached, can theoretically be equal to F when convertible frequency air-conditioner is switched on1, and in convertible frequency air-conditioner operational process
The operating frequency of any moment, theoretically may not exceed Fmax。
But consider the problems of to obtain overcurrent protection and cause to shut down, it should be according to F0、F1、Fmax, to integrate determining booting
Operating frequency.
Based on above content it is found that the convertible frequency air-conditioner last time shut down the reason of be overcurrent shut down when, it is desirable that booting operating
Frequency is F0、F1、FmaxIn minimum value；The reason of convertible frequency air-conditioner last time shuts down is not overcurrent shutdown, such as orderly closedown
When, it is desirable that booting operating frequency is F1、FmaxIn minimum value.In addition, if convertible frequency air-conditioner last time overcurrent is shut down, and Fmax>
F0When, it needs to update FmaxValue, such as can be by FmaxValue be updated to F0Value.
As can be seen that based on different convertible frequency air-conditioner operating condition, FmaxValue correspondence change, pass through control frequency conversion
The compressor operation frequency of air-conditioning at any one time is no more than maximum allowable operating frequency, it is possible to reduce the hair of overcurrent situations
It is raw.
Based on above content, to guarantee that the operating frequency of any moment is no more than maximum allowable operating frequency, therefore in this hair
In bright one embodiment, before the step 106, further comprise: judging whether second operating frequency is greater than in advance
Determining maximum allowable operating frequency, if so, second operating frequency is updated, so that second operating frequency is equal to described
Maximum allowable operating frequency, and step 106 is executed, otherwise, execute step 106.
In detail, in convertible frequency air-conditioner operational process any moment operating frequency, theoretically may not exceed maximum allowable fortune
Turn frequency.In this way, can be verified to its numerical values recited after calculating the second operating frequency in step 105, if it is greater than most
It is big to allow operating frequency, then need to be updated it, such as the value of the second operating frequency can be updated to it is maximum allowable
The value of operating frequency is equal.
As an example it is assumed that Fmax=100Hz, is computed, the second operating frequency Fi=110Hz, Fi> Fmax, therefore can enable
Fi=Fmax=100Hz.
By periodically controlling the operating frequency of compressor, control convertible frequency air-conditioner can be played indirectly at the corresponding moment
The effect of complete machine input current.But the variation of electric current is not only related with operating frequency, it is also related with other factors such as negative
Load degree, indoor/outdoor temperature-difference mutation, set temperature mutation etc., therefore other than controlling operating frequency, it can also be directly right
Electric current is controlled.
Based on above content, in an embodiment of the invention, this method further comprises: room when according to the booting moment
Outer temperature and room temperature determine frequency limit electric current, frequency reducing electric current, shut down electric current；
After the step 105, further comprise:
B1: judging whether second electric current is greater than the frequency limit electric current, if so, executing B2, otherwise, executes step 106；
B2: judging whether second operating frequency is greater than predetermined maximum allowable operating frequency, if so, updating institute
The second operating frequency is stated, so that second operating frequency is equal to the maximum allowable operating frequency, and executes B3, otherwise, more
The new maximum allowable operating frequency, so that the maximum allowable operating frequency is equal to second operating frequency, and executes B3；
B3: judging whether second electric current is greater than the frequency reducing electric current, if so, according to second electric current, the electricity
Variable quantity, the shutdown electric current are flowed, determines frequency reducing amplitude, and according to second operating frequency and the frequency reducing amplitude, is calculated
4th operating frequency, and B4 is executed, otherwise, execute step 106；
B4: judging whether the 4th operating frequency is greater than the maximum allowable operating frequency, if so, updating the described 4th
Operating frequency so that the 4th operating frequency is equal to the maximum allowable operating frequency, and executes B5, otherwise, executes step
106；
B5: judging whether second electric current is greater than the shutdown electric current, if so, close compressor and the current stream of end
Otherwise journey executes step 106.
As can be seen that in B1, if the second electric current is greater than frequency limit electric current, frequency limit processing can be carried out.In this way, in B2
In, it, can be with corresponding to the second operating frequency based on the numerical values recited comparison between the second operating frequency and maximum allowable operating frequency
The numerical value of rate or maximum allowable operating frequency is updated.
For example, if Fi=110Hz, Fmax=100Hz, then enable Fi=Fmax=100Hz；If Fi=90Hz, Fmax=100Hz,
Then enable Fmax=Fi=90Hz.
Based on above content it is found that needing further whether judge the second electric current if the second electric current is greater than frequency limit electric current
Greater than frequency reducing electric current.In B3, if the second electric current is greater than frequency reducing electric current, down conversion process can be carried out.In this way, in B3, it can
To calculate frequency reducing amplitude, and corresponding down conversion process is carried out according to frequency reducing amplitude.
In one embodiment of the invention, when frequency reducing amplitude is positive value, the 4th operating frequency can subtract for the second operating frequency
The difference of frequency reducing amplitude is gone, conversely, the 4th operating frequency can be the adduction of the second operating frequency and frequency reducing amplitude.
Same as above, calculated 4th operating frequency needs are compared with maximum allowable operating frequency, if the 4th fortune
Turn frequency greater than maximum allowable operating frequency, then the value to the 4th operating frequency is needed to be updated.
Accordingly, if the second electric current is greater than frequency reducing electric current, need further to judge whether the second electric current is greater than shutdown electricity
Stream.Once monitor that current current value reaches shutdown electric current, can close compressor so that convertible frequency air-conditioner shut down.
As shown in Fig. 2, one embodiment of the invention provides another current protection control method, this method is for change
For the current protection control of frequency air-conditioning, specifically includes the following steps:
Step 201: outdoor temperature and indoor temperature and set temperature when according to the convertible frequency air-conditioner booting moment determine
Initial operation frequency and maximum allowable operating frequency；Outdoor temperature and indoor temperature when according to the convertible frequency air-conditioner booting moment, really
Fixed limit frequency electric current, shuts down electric current at frequency reducing electric current.
Step 202: through software scans, judging whether stop because of overcurrent protection when a shutdown moment on convertible frequency air-conditioner
Otherwise machine, executes step 204 if so, executing step 203.
Step 203: whether third operating frequency when judging a shutdown moment on convertible frequency air-conditioner is greater than initial operation frequency
Otherwise rate, executes step 205 if so, executing step 204.
Step 204: judging whether initial operation frequency is greater than maximum allowable operating frequency, if so, determining booting operating frequency
Rate is equal to maximum allowable operating frequency, and executes step 206, otherwise, it determines booting operating frequency is equal to initial operation frequency, and
Execute step 206.
Step 205: judging whether third operating frequency is greater than maximum allowable operating frequency, if so, determining booting operating frequency
Rate is equal to maximum allowable operating frequency, and executes step 206, otherwise, it determines booting operating frequency is equal to third operating frequency, and
Maximum allowable operating frequency is updated, so that maximum allowable operating frequency is equal to third operating frequency, and executes step 206.
Step 206: the operating frequency when control compressor booting moment is the booting operating frequency determined, and with booting
Moment as a upper monitoring moment, executed step 207.
Step 207: determining the first electric current and the first operating frequency when a monitoring moment.
Step 208: the second electric current and room when determining to reach periodical monitoring condition, when determining the current monitor moment
Interior temperature.
Step 209: according to the first electric current and the second electric current, calculating current variable quantity, and when according to the current monitor moment
Room temperature and set temperature, determine frequency change amplitude.
Step 210: according to the first electric current, current change quantity, the second electric current, determining frequency correction value.
Step 211: according to the first operating frequency, frequency variation amplitude and frequency correction value, calculating the second operating frequency.
Step 212: judging whether the second operating frequency is greater than maximum allowable operating frequency, if so, updating the second operating frequency
Rate so that the second operating frequency is equal to maximum allowable operating frequency, and executes step 213, otherwise, executes step 213.
Step 213: judging whether the second electric current is greater than frequency limit electric current, if so, executing step 214, otherwise, execute step
218。
Step 214: judging whether the second operating frequency is greater than maximum allowable operating frequency, if so, updating the second operating frequency
Rate so that the second operating frequency is equal to maximum allowable operating frequency, and executes step 215, otherwise, updates maximum allowable operating frequency
Rate so that maximum allowable operating frequency is equal to the second operating frequency, and executes step 215.
Step 215: judging whether the second electric current is greater than frequency reducing electric current, if so, according to the second electric current, current change quantity, stopping
Electromechanics stream determines frequency reducing amplitude, and according to the second operating frequency and frequency reducing amplitude, calculates the 4th operating frequency, and execute step
216, otherwise, execute step 218.
Step 216: judging whether the 4th operating frequency is greater than maximum allowable operating frequency, if so, updating the 4th operating frequency
Rate so that the 4th operating frequency is equal to maximum allowable operating frequency, and executes step 217, otherwise, executes step 218.
Step 217: judge whether the second electric current is greater than shutdown electric current, if so, close compressor and terminate current process, it is no
Then, step 218 is executed.
Step 218: the operating frequency when control compressor current monitor moment is the second operating frequency, and with current monitor
Moment as a upper monitoring moment, executed step 207.
In the embodiment of the present invention, after convertible frequency air-conditioner starting up, first determine whether the shutdown of air-conditioning last time occurs because of overcurrent
Protection is shut down, and is shut down if there is overcurrent protection, is controlled the maximum frequency of operation, avoid causing to trigger because of operation of air conditioner frequency height
Overcurrent is shut down again.In convertible frequency air-conditioner operational process, detects the complete machine input current of air-conditioning and record the variation of input current
Situation, according to the variation speed of electric current, when input current is close to frequency limit electric current, reduce convertible frequency air-conditioner frequency raising frequency amplitude and
Rate avoids electric current from overshoot occur, be more than frequency reducing electric current, leads to compressor frequency reducing to keep the revolution electric current of compressor to stablize
And the frequency of occurrences fluctuates.
In conclusion current protection control method provided in an embodiment of the present invention, the control of operating frequency not only only root
Judged according to system temperature sensor, while also current information is added in governing factor, is beneficial to avoid rising as far as possible
Occurs overcurrent reducing frequency phenomenon again after frequency repeatedly.The detection for increasing current changing rate during operation of air conditioner, according to curent change
Rate determines compressor operation frequency, to reach steady running effect, frequency fluctuation problem caused by alleviating because of overcurrent protection frequency reducing.
Therefore, the embodiment of the present invention can alleviate frequency fluctuation situation that convertible frequency air-conditioner occurs in current protection and air-conditioning in weight
Because of the halting problem repeatedly of overcurrent protection appearance under load behavior.
As shown in figure 3, one embodiment of the invention provides a kind of current protection control apparatus, comprising:
First determination unit 301, for determining the first electric current and the first operating frequency when a upper monitoring moment；
Second determination unit 302, for when determining to reach periodical monitoring condition, determining the current monitor moment
Second electric current and room temperature；
First processing units 303, for according to first electric current and second electric current, calculating current variable quantity, with
And room temperature and preset set temperature when according to the current monitor moment, determine that frequency changes amplitude；According to described
First electric current, the current change quantity, second electric current, determine frequency correction value；According to first operating frequency, described
Frequency changes amplitude and the frequency correction value, calculates the second operating frequency；
The second processing unit 304 is the second operating frequency for operating frequency when controlling the current monitor moment
Rate, and using the current monitor moment as a upper monitoring moment, trigger first determination unit 301.
In an embodiment of the invention, referring to FIG. 4, the current protection control apparatus further include:
Third processing unit 401, outdoor temperature and indoor temperature and the setting temperature when for according to the booting moment
Degree, determines initial operation frequency and maximum allowable operating frequency；Through software scans, whether because of mistake when judging a upper shutdown moment
Current protection and shut down, if so, triggering fourth processing unit 402, otherwise, trigger the 5th processing unit 403；
Whether the fourth processing unit 402 is big for third operating frequency when judging the upper shutdown moment
In the initial operation frequency, if so, otherwise triggering the 5th processing unit 403 triggers the 6th processing unit 404；
5th processing unit 403, for judging whether the initial operation frequency is greater than the maximum allowable operating
Frequency if so, determining that booting operating frequency is equal to the maximum allowable operating frequency, and triggers the 7th processing unit 405, no
Then, it determines that booting operating frequency is equal to the initial operation frequency, and triggers the 7th processing unit 405；
6th processing unit 404, for judging whether the third operating frequency is greater than the maximum allowable operating
Frequency if so, determining that booting operating frequency is equal to the maximum allowable operating frequency, and triggers the 7th processing unit 405,
Otherwise, it determines booting operating frequency is equal to the third operating frequency, and the maximum allowable operating frequency is updated, so that described
Maximum allowable operating frequency is equal to the third operating frequency, and triggers the 7th processing unit 405；
7th processing unit 405 is the booting fortune determined for operating frequency when controlling the booting moment
Turn frequency, and using the booting moment as a upper monitoring moment, and triggers first determination unit 301.
In an embodiment of the invention, described the second processing unit 304 is also used to judge that second operating frequency is
It is no to be greater than predetermined maximum allowable operating frequency, if so, second operating frequency is updated, so that the second operating frequency
Rate is equal to the maximum allowable operating frequency, and using the current monitor moment as a upper monitoring moment, triggering described the
Otherwise one determination unit 301 using the current monitor moment as a upper monitoring moment, triggered first determination unit
301。
In an embodiment of the invention, referring to FIG. 4, the current protection control apparatus further include:
8th processing unit 406, for according to booting the moment when outdoor temperature and indoor temperature, determine frequency limit electric current,
Frequency reducing electric current shuts down electric current；Judge whether second electric current is greater than the frequency limit electric current, if so, the 9th processing unit of triggering
407, otherwise, trigger described the second processing unit 304；
9th processing unit 407, for judging it is predetermined maximum fair whether second operating frequency is greater than
Perhaps operating frequency, if so, second operating frequency is updated, so that second operating frequency is equal to the maximum allowable operating
Frequency, and the tenth processing unit 408 is triggered, otherwise, the maximum allowable operating frequency is updated, so that the maximum allowable operating
Frequency is equal to second operating frequency, and triggers the tenth processing unit 408；
Tenth processing unit 408, for judging whether second electric current is greater than the frequency reducing electric current, if so, root
According to second electric current, the current change quantity, the shutdown electric current, frequency reducing amplitude is determined, and according to the second operating frequency
Rate and the frequency reducing amplitude calculate the 4th operating frequency, and trigger the 11st processing unit 409, otherwise, at triggering described second
Manage unit 304；
11st processing unit 409, for judging whether the 4th operating frequency is greater than the maximum allowable fortune
Turn frequency, if so, the 4th operating frequency is updated, so that the 4th operating frequency is equal to the maximum allowable operating frequency
Rate, and trigger the 12nd processing unit 410 and otherwise trigger described the second processing unit 304；
12nd processing unit 410, for judging whether second electric current is greater than the shutdown electric current, if so,
Close compressor simultaneously terminates, and otherwise, triggers described the second processing unit 304.
In an embodiment of the invention, the first processing units 303 are specifically used for calculating using above-mentioned formula (1)
The current change quantity calculates second operating frequency using above-mentioned formula (2).
The contents such as the information exchange between each unit, implementation procedure in above-mentioned apparatus, due to implementing with the method for the present invention
Example is based on same design, and for details, please refer to the description in the embodiment of the method for the present invention, and details are not described herein again.
In conclusion each embodiment of the invention at least has the following beneficial effects:
1, in the embodiment of the present invention, the first electric current and the first operating frequency when a monitoring moment are determined；Determination is worked as
The second electric current and room temperature when the preceding monitoring moment；Current change quantity is calculated according to the first electric current and the second electric current, according to working as
Room temperature and preset set temperature when the preceding monitoring moment determine that frequency changes amplitude；According to the first electric current, curent change
Amount, the second electric current, determine frequency correction value；According to the first operating frequency, frequency variation amplitude and frequency correction value, second is calculated
Operating frequency；Operating frequency when controlling the current monitor moment is the second operating frequency, and using the current monitor moment as upper one
A monitoring moment, so circulation execute.It is periodically based on curent change speed, corresponds to the operating frequency of adjustment compressor, so that
Compressor operation is stablized, and curent change is avoided to overshoot and cause compressor shutdown.Therefore, the embodiment of the present invention can alleviate compression
Machine halting problem repeatedly.
2, current protection control method provided in an embodiment of the present invention, the control of operating frequency is not only only according to system temperature
Degree sensor is judged, while also current information is added in governing factor, is beneficial to avoid as far as possible after raising frequency repeatedly
There is overcurrent reducing frequency phenomenon again.The detection for increasing current changing rate during operation of air conditioner, determines according to current changing rate and presses
Contracting machine operating frequency, to reach steady running effect, frequency fluctuation problem caused by alleviating because of overcurrent protection frequency reducing.Therefore, originally
Inventive embodiments can alleviate the frequency fluctuation situation that convertible frequency air-conditioner occurs in current protection and air-conditioning in heavy duty operating condition
The lower halting problem repeatedly occurred by overcurrent protection.
It should be noted that, in this document, such as first and second etc relational terms are used merely to an entity
Or operation is distinguished with another entity or operation, is existed without necessarily requiring or implying between these entities or operation
Any actual relationship or order.Moreover, the terms "include", "comprise" or its any other variant be intended to it is non-
It is exclusive to include, so that the process, method, article or equipment for including a series of elements not only includes those elements,
It but also including other elements that are not explicitly listed, or further include solid by this process, method, article or equipment
Some elements.In the absence of more restrictions, the element limited by sentence " including a 〃 〃 ", it is not excluded that
There is also other identical factors in the process, method, article or apparatus that includes the element.
Those of ordinary skill in the art will appreciate that: realize that all or part of the steps of above method embodiment can pass through
The relevant hardware of program instruction is completed, and program above-mentioned can store in computer-readable storage medium, the program
When being executed, step including the steps of the foregoing method embodiments is executed；And storage medium above-mentioned includes: ROM, RAM, magnetic disk or light
In the various media that can store program code such as disk.
Finally, it should be noted that the foregoing is merely presently preferred embodiments of the present invention, it is merely to illustrate skill of the invention
Art scheme, is not intended to limit the scope of the present invention.Any modification for being made all within the spirits and principles of the present invention,
Equivalent replacement, improvement etc., are included within the scope of protection of the present invention.
Claims (10)
1. a kind of current protection control method, which is characterized in that be applied to convertible frequency air-conditioner, comprising:
S1: the first electric current and the first operating frequency when a monitoring moment are determined；
S2: the second electric current and room temperature when determining to reach periodical monitoring condition, when determining the current monitor moment；
S3: according to first electric current and second electric current, calculating current variable quantity, and according to the current monitor moment
When room temperature and preset set temperature, determine frequency change amplitude；
S4: according to first electric current, the current change quantity, second electric current, frequency correction value is determined；
S5: according to first operating frequency, frequency variation amplitude and the frequency correction value, the second operating frequency is calculated
Rate；
S6: operating frequency when controlling the current monitor moment is second operating frequency, and when with the current monitor
It carves and was used as a upper monitoring moment, execute S1.
2. the method according to claim 1, wherein further comprising before the S1:
A1: according to booting the moment when outdoor temperature and indoor temperature and the set temperature, determine initial operation frequency and
Maximum allowable operating frequency；
A2: through software scans, judging whether shut down because of overcurrent protection when a upper shutdown moment, if so, A3 is executed, it is no
Then, A4 is executed；
A3: whether third operating frequency when judging the upper shutdown moment is greater than the initial operation frequency, if so, holding
Otherwise row A4 executes A5；
A4: judging whether the initial operation frequency is greater than the maximum allowable operating frequency, if so, determining booting operating frequency
Equal to the maximum allowable operating frequency, and A6 is executed, otherwise, it determines booting operating frequency is equal to the initial operation frequency,
And execute A6；
A5: judging whether the third operating frequency is greater than the maximum allowable operating frequency, if so, determining booting operating frequency
Equal to the maximum allowable operating frequency, and A6 is executed, otherwise, it determines booting operating frequency is equal to the third operating frequency,
And the maximum allowable operating frequency is updated, so that the maximum allowable operating frequency is equal to the third operating frequency, and hold
Row A6；
A6: operating frequency when controlling the booting moment is the booting operating frequency determined, and with booting moment work
For a upper monitoring moment, S1 was executed.
3. the method according to claim 1, wherein
Before the S6, further comprise: judging whether second operating frequency is greater than predetermined maximum allowable fortune
Turn frequency, if so, second operating frequency is updated, so that second operating frequency is equal to the maximum allowable operating frequency
Rate, and S6 is executed, otherwise, execute S6.
4. the method according to claim 1, wherein
Further comprise: outdoor temperature and indoor temperature when according to the booting moment determines frequency limit electric current, frequency reducing electric current, shuts down
Electric current；
After the S5, further comprise:
B1: judging whether second electric current is greater than the frequency limit electric current, if so, executing B2, otherwise, executes S6；
B2: judging whether second operating frequency is greater than predetermined maximum allowable operating frequency, if so, updating described the
Two operating frequencies so that second operating frequency is equal to the maximum allowable operating frequency, and execute B3, otherwise, update institute
Maximum allowable operating frequency is stated, so that the maximum allowable operating frequency is equal to second operating frequency, and executes B3；
B3: judging whether second electric current is greater than the frequency reducing electric current, if so, being become according to second electric current, the electric current
Change amount, the shutdown electric current determine frequency reducing amplitude, and according to second operating frequency and the frequency reducing amplitude, calculate the 4th
Operating frequency, and B4 is executed, otherwise, execute S6；
B4: judging whether the 4th operating frequency is greater than the maximum allowable operating frequency, if so, updating the 4th operating
Frequency so that the 4th operating frequency is equal to the maximum allowable operating frequency, and executes B5, otherwise, executes S6；
B5: judging whether second electric current is greater than the shutdown electric current, if so, closing the compressor inside the convertible frequency air-conditioner
And terminate current process, otherwise, execute S6.
5. according to claim 1 to any method in 4, which is characterized in that
In the S3, the current change quantity meets formula one；
In the S5, second operating frequency meets formula two；
The formula one includes: △ I=Ii-Ii-1
The formula two includes: Fi=Fi-1+△F1+△F2
Wherein, △ I is the current change quantity, IiFor second electric current, Ii-1For first electric current, FiFor second fortune
Turn frequency, Fi-1For first operating frequency, △ F1Change amplitude, △ F for the frequency2For the frequency correction value.
6. a kind of current protection control apparatus, which is characterized in that be applied to convertible frequency air-conditioner, comprising:
First determination unit, for determining the first electric current and the first operating frequency when a upper monitoring moment；
Second determination unit, for when determining to reach periodical monitoring condition, determining the second electricity when the current monitor moment
Stream and room temperature；
First processing units are used for according to first electric current and second electric current, calculating current variable quantity, and according to institute
The room temperature and preset set temperature when the current monitor moment are stated, determines that frequency changes amplitude；According to first electric current,
The current change quantity, second electric current, determine frequency correction value；Changed according to first operating frequency, the frequency
Amplitude and the frequency correction value calculate the second operating frequency；
The second processing unit is second operating frequency for operating frequency when controlling the current monitor moment, and with
The current monitor moment as a upper monitoring moment, triggered first determination unit.
7. current protection control apparatus according to claim 6, which is characterized in that further include:
Third processing unit, outdoor temperature and indoor temperature and the set temperature when for according to the booting moment, determines
Initial operation frequency and maximum allowable operating frequency；Through software scans, whether because of over current protection when judging a upper shutdown moment
It protects and shuts down, if so, otherwise triggering fourth processing unit triggers the 5th processing unit；
Whether the fourth processing unit is greater than described first for third operating frequency when judging the upper shutdown moment
Beginning operating frequency, if so, otherwise triggering the 5th processing unit triggers the 6th processing unit；
5th processing unit, for judging whether the initial operation frequency is greater than the maximum allowable operating frequency, if
It is to determine that booting operating frequency is equal to the maximum allowable operating frequency, and trigger the 7th processing unit, otherwise, it determines booting
Operating frequency is equal to the initial operation frequency, and triggers the 7th processing unit；
6th processing unit, for judging whether the third operating frequency is greater than the maximum allowable operating frequency, if
It is to determine that booting operating frequency is equal to the maximum allowable operating frequency, and triggers the 7th processing unit, otherwise, it determines
The operating frequency that is switched on is equal to the third operating frequency, and updates the maximum allowable operating frequency, so that described maximum allowable
Operating frequency is equal to the third operating frequency, and triggers the 7th processing unit；
7th processing unit, operating frequency when for controlling the booting moment is the booting operating frequency determined,
And using the booting moment as a upper monitoring moment, first determination unit was triggered.
8. current protection control apparatus according to claim 6, which is characterized in that
Described the second processing unit, is also used to judge whether second operating frequency is greater than predetermined maximum allowable operating
Frequency, if so, second operating frequency is updated, so that second operating frequency is equal to the maximum allowable operating frequency,
And using the current monitor moment as a upper monitoring moment, first determination unit was triggered, otherwise, with the current prison
The moment was controlled as a upper monitoring moment, triggers first determination unit.
9. current protection control apparatus according to claim 6, which is characterized in that further include:
8th processing unit, outdoor temperature and indoor temperature when for according to the booting moment determine frequency limit electric current, frequency reducing electricity
Stream shuts down electric current；Judge whether second electric current is greater than the frequency limit electric current, if so, the 9th processing unit of triggering, otherwise,
Trigger described the second processing unit；
9th processing unit, for judging whether second operating frequency is greater than predetermined maximum allowable operating frequency
Rate, if so, second operating frequency is updated, so that second operating frequency is equal to the maximum allowable operating frequency, and
The tenth processing unit is triggered, otherwise, updates the maximum allowable operating frequency, so that the maximum allowable operating frequency is equal to institute
The second operating frequency is stated, and triggers the tenth processing unit；
Tenth processing unit, for judging whether second electric current is greater than the frequency reducing electric current, if so, according to described
Two electric currents, the current change quantity, the shutdown electric current, determine frequency reducing amplitude, and according to second operating frequency and described
Frequency reducing amplitude calculates the 4th operating frequency, and triggers the 11st processing unit and otherwise trigger described the second processing unit；
11st processing unit, for judging whether the 4th operating frequency is greater than the maximum allowable operating frequency,
If so, updating the 4th operating frequency, so that the 4th operating frequency is equal to the maximum allowable operating frequency, and trigger
Otherwise 12nd processing unit triggers described the second processing unit；
12nd processing unit, for judging whether second electric current is greater than the shutdown electric current, if so, described in closing
Otherwise compressor and end inside convertible frequency air-conditioner trigger described the second processing unit.
10. according to the current protection control apparatus any in claim 6 to 9, which is characterized in that
The first processing units are calculated described specifically for calculating the current change quantity using formula one using formula two
Second operating frequency；
The formula one includes: △ I=Ii-Ii-1
The formula two includes: Fi=Fi-1+△F1+△F2
Wherein, △ I is the current change quantity, IiFor second electric current, Ii-1For first electric current, FiFor second fortune
Turn frequency, Fi-1For first operating frequency, △ F1Change amplitude, △ F for the frequency2For the frequency correction value.
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| CN110160296B (en) * | 2019-05-23 | 2020-10-09 | 百尔制冷(无锡)有限公司 | Dynamic control method for current of screw parallel unit |
| CN110822595A (en) * | 2019-11-12 | 2020-02-21 | 常州瑞创电器科技有限公司 | Operation method and device of full-direct-current solar variable frequency air conditioner |
| CN111156654B (en) * | 2019-12-23 | 2021-05-28 | 珠海格力电器股份有限公司 | Variable-capacity compressor air conditioner system operation control method, computer readable storage medium and air conditioner |
| CN111720975A (en) * | 2020-06-22 | 2020-09-29 | 珠海格力电器股份有限公司 | Control method, system and device of air conditioner |
| CN112065703A (en) * | 2020-09-29 | 2020-12-11 | 广东芬尼克兹节能设备有限公司 | Segmented control method and device for operating frequency of compressor |
| CN113280488B (en) * | 2021-05-31 | 2023-04-25 | 广东美的制冷设备有限公司 | Air conditioner control method, air conditioner and computer storage medium |
| CN114183953A (en) * | 2021-12-14 | 2022-03-15 | 广东申菱商用空调设备有限公司 | Compressor operation control method, device, equipment and storage medium |
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