CN110247601A - A kind of current calculation method and system of compressor - Google Patents
A kind of current calculation method and system of compressor Download PDFInfo
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- CN110247601A CN110247601A CN201910588281.XA CN201910588281A CN110247601A CN 110247601 A CN110247601 A CN 110247601A CN 201910588281 A CN201910588281 A CN 201910588281A CN 110247601 A CN110247601 A CN 110247601A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/14—Estimation or adaptation of machine parameters, e.g. flux, current or voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The invention discloses a kind of current calculation methods of compressor, including reconstructing three-phase current according to the current sampling data of acquisition, and the three-phase electricity flow valuve of compressor are calculated；The three-phase electricity flow valuve is subjected to Clark transformation, Park transformation, obtains current phasor component Id, the Iq of compressor phase current under rotor coordinate；Phase current values are calculated according to described current phasor component Id, IqThe current calculation method of compressor provided in an embodiment of the present invention can be obtained compressor current without current transformer, reduce hardware cost, producting process difficulty, while improving production efficiency.The present invention also provides a kind of electric current computing systems of compressor.
Description
Technical field
The present invention relates to compressor control technical fields, a kind of current calculation method more particularly, to compressor and are
System.
Background technique
As compressor control is more and more extensive using converter technique, frequency-changeable compressor in use, needs to obtain
On the one hand the current current value of compressor, accessed current value can be used for judging whether frequency conversion board has reached hardware
The limit of design controls compressor frequency reducing when frequency conversion board reaches capacity, so that hardware be avoided to burn；On the other hand can pass through
The size of current value is limited, the high-pressure of frequency conversion board temperature rise and compressor application system is controlled, to improve the stabilization of system
Property；The input power of complete machine can also be calculated according to input voltage value, recycle the refrigeration or heats power of complete machine, calculate
The efficiency of complete machine is obtained, whether the working condition for judging complete machine is normal.
And the method for the electric current of traditional measurement compressor is that current transformer is passed through using the phase line of compressor, Current Mutual Inductance
Collected signal is transmitted to current sampling module by device, and finally according to current sampling module, treated that current signal obtains electricity
Flow valuve.But it using the current value of conventional method measurement compressor, has the problem that
1, it needs to cause hardware cost higher using current transformer；
2, batch production needs to increase the work of threading overcurrent mutual inductor, causes production technology more complex, production efficiency
It is low.
Summary of the invention
The embodiment of the invention provides a kind of current calculation method of compressor and systems, to solve traditional compressor
Current measurement needs the technical issues of using current transformer, without using current transformer that compressor current can be realized
Measurement, reduce hardware cost and producting process difficulty, while improving production efficiency.
In order to solve the above-mentioned technical problem, in a first aspect, the embodiment of the invention provides a kind of calculating of the electric current of compressor
Method at least includes the following steps:
Three-phase current is reconstructed according to the current sampling data of acquisition, and the three-phase electricity flow valuve of compressor is calculated；
The three-phase electricity flow valuve is subjected to Clark transformation, Park transformation, obtains compressor phase current under rotor coordinate
Current phasor component Id, Iq；
Phase current values are calculated according to described current phasor component Id, Iq
Preferably, the method also includes:
According to the voltage sample data reconstruction three-phase voltage of acquisition, and the three-phase voltage value of compressor is calculated；
The three-phase voltage value is subjected to Clark transformation, Park transformation, obtains compressor phase voltage under rotor coordinate
Voltage vector component Vd, Vq；
According to the voltage vector component Vd, Vq, described current phasor component Id, Iq, two quadrature powers are calculated
The conjunction performance number of vector
The phase voltage value U of compressor is obtained using voltage sample module；
According to the conjunction performance numberPhase current values I=P/ is calculated in the phase voltage value U
U。
Preferably, described that three-phase current is reconstructed according to the current sampling data of acquisition and compressor is calculated
Three-phase electricity flow valuve, specifically:
By the bus of single resistance connect compressor to obtain the current sampling data；
Three-phase current reconstruct is carried out according to the current sampling data, and the three-phase electricity flow valuve is calculated.
Preferably, the method also includes:
Using oscillograph test to obtain the current phasor component Id fixed error value and the current phasor component Iq
Fixed error value Iq '；
The fixed error of the phase current values is calculated according to the fixed error value Id ', the fixed error value Iq '
According to the fixed errorTo the phase current valuesCarry out deviation compensation.
Preferably, when calculating the input current value of frequency conversion drive plate of compressor, pass through the frequency conversion of compressor
Driving plate obtains the three-phase electricity flow valuve and the three-phase voltage value of compressor using vector control method；
The voltage sample module collects the input voltage of the frequency conversion drive plate of the compressor, and by the input
Phase voltage value U of the voltage as the compressor, so that the phase current values I=P/U is the input of the frequency conversion drive plate
Current value.
Second aspect, the embodiment of the present invention also provide a kind of electric current computing system of compressor, comprising:
Three-phase electricity flow valuve computing module for reconstructing three-phase current according to the current sampling data of acquisition, and is calculated
The three-phase electricity flow valuve of compressor；
Electric current coordinate transformation module, for the three-phase electricity flow valuve to be carried out Clark transformation, Park is converted, and is compressed
Current phasor component Id, the Iq of machine phase current under rotor coordinate；
First current calculation module, for phase current values to be calculated according to described current phasor component Id, Iq
Preferably, further includes:
Three-phase voltage value computing module for the voltage sample data reconstruction three-phase voltage according to acquisition, and is calculated
The three-phase voltage value of compressor；
Voltage coordinate conversion module, for the three-phase voltage value to be carried out Clark transformation, Park is converted, and is compressed
Voltage vector component Vd, the Vq of machine phase voltage under rotor coordinate；
Power computation module is closed, for according to the voltage vector component Vd, Vq, described current phasor component Id, Iq, meter
Calculation obtains the conjunction performance number of two quadrature power vectors
Voltage sample module, for obtaining the phase voltage value U of compressor using voltage sample module；
Second current calculation module, for according to the conjunction performance numberThe phase voltage value U
Phase current values I=P/U is calculated.
Preferably, the three-phase electricity flow valuve computing module, is used for:
By the bus of single resistance connect compressor to obtain the current sampling data；
Three-phase current reconstruct is carried out according to the current sampling data, and the three-phase electricity flow valuve is calculated.
Preferably, further includes:
Error measurement module obtains the fixed error value of the current phasor component Id for testing using oscillograph, and
The fixed error value Iq ' of the current phasor component Iq；
Error calculating module, it is described for being calculated according to the fixed error value Id ', the fixed error value Iq '
The fixed error of phase current values
Deviation compensating module, for according to the fixed errorTo the phase current valuesCarry out deviation compensation.
Preferably, when calculating the input current value of frequency conversion drive plate of compressor,
The three-phase electricity flow valuve and the institute of compressor are obtained using vector control method by the frequency conversion drive plate of compressor
State three-phase voltage value；
The voltage sample module collects the input voltage of the frequency conversion drive plate of the compressor, and by the input
Phase voltage value U of the voltage as the compressor, so that the phase current values I=P/U is the input of the frequency conversion drive plate
Current value.
The current calculation method and system of compressor provided in an embodiment of the present invention, method include using vector control method
Obtain the three-phase electricity flow valuve of compressor；The three-phase electricity flow valuve is subjected to Clark transformation, Park transformation, obtains compressor mutually electricity
Flow current phasor component Iq, Id under rotor coordinate；According to described current phasor component Iq, Id, Pythagorean theorem meter is utilized
Calculation obtains phase current valuesThe embodiment of the present invention obtains the three-phase current of compressor using vector control method
Value, the phase current values of compressor are calculated by coordinate transformation method, without using current transformer to pass through phase line, into
And it eliminates because of current transformer bring cost problem and technological problems.
Detailed description of the invention
Fig. 1 is the process step figure of the current calculation method of the compressor of the embodiment of the present invention one；
Fig. 2 is the structural schematic diagram of the electric current computing system of the compressor of the embodiment of the present invention one；
Fig. 3 is the structural schematic diagram of the electric current computing system of the compressor of the prior art；
Fig. 4 is the process step figure of the current calculation method of the compressor of the embodiment of the present invention two；
Fig. 5 is the structural schematic diagram of the electric current computing system of the compressor of the embodiment of the present invention two；
Fig. 6 is the structural schematic diagram of the electric current computing system of the compressor of the prior art.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
First embodiment of the invention:
A kind of current calculation method of compressor is provided, is included at least with Fig. 2, first embodiment of the invention referring to Figure 1
Following steps:
S101, three-phase current is reconstructed according to the current sampling data of acquisition, and the three-phase electricity flow valuve of compressor is calculated.
In embodiments of the present invention, using the technology of single resistance sampling reconstruct three-phase current, the three-phase electricity of compressor is obtained
Flow valuve, by the bus of single resistance connect compressor to obtain the current sampling data, single resistance sampling data are sent to
In three-phase reconstructed module, to carry out three-phase current reconstruct according to the current sampling data, and then pass through frequency conversion drive plate
The three-phase electricity flow valuve is calculated in MCU.
S102, the three-phase electricity flow valuve is carried out to Clark transformation, Park transformation, obtains compressor phase current and is sat in rotor
Current phasor component Id, Iq under mark system.
In the present embodiment, the MCU of the frequency conversion drive plate passes through three phase transformation two-phases according to the three-phase electricity flow valuve
The Park of Clark coordinate transformation and rest frame to rotor rotating coordinate system converts, and obtains compressor phase current and sits in rotor
Mark Id the and Iq shaft current vector component fastened.
S103, phase current values are calculated according to described current phasor component Id, Iq
In the present embodiment, since Id the and Iq shaft current vector component on rotor coordinate is relative to rotor coordinate,
Therefore phase current values are calculated by Pythagorean theorem for DC quantity in two current phasor modulus valueTo institute
State frequency conversion drive plate can be judged automatically according to the three-phase electricity flow valuve whether can with raising frequency, frequency reducing or protection shut down.
Wherein, the inside of the frequency conversion drive plate is equipped with according to the soft of the phase current values control compressor frequency function of receiving
Part code, to control compressor frequency reducing, avoids so as to judge whether frequency conversion drive plate has reached the limit of hardware design
Hardware is burnt, or by limitation phase current size, controls the high-pressure of the temperature rise of frequency conversion drive plate and compressor application system, from
And improve the stability of system.
Compared to the prior art shown in Fig. 3, using any phase line that current transformer passes through compressor cause hardware at
The problem that this height, production technology are complicated and production efficiency is lower, the embodiment of the present invention obtain compressor using vector control method
Three-phase electricity flow valuve, the phase current values of compressor are calculated by coordinate transformation method, without using current transformer
It across phase line, and then eliminates because of current transformer bring cost problem and technological problems, advantageously reduces production technology behaviour
Make difficulty and improves production efficiency.
In the present embodiment, it should be noted that described that three-phase current is reconstructed according to the current sampling data of acquisition and is counted
Calculation obtains the three-phase electricity flow valuve of compressor, specifically:
By the bus of single resistance connect compressor to obtain the current sampling data；
Three-phase current reconstruct is carried out according to the current sampling data, and the three-phase electricity flow valuve is calculated.
The present embodiment only needs resistance to obtain electric current in negative busbar, using three-phase reconstruction software and coordinate transformation software,
The phase current values that available software calculates are eliminated without being measured by current transformer because of current transformer
Bring cost problem and technological problems.Wherein, frequency conversion drive plate, three-phase reconstruction software (module), coordinate transformation software etc. are equal
Known to those skilled in the art, herein without repeating.
In addition, it is contemplated that resistance uniformity error and resistance sampling modular circuit conformity error, can make software estimate
Phase current values and the test of practical oscillograph phase current values there are certain deviation, and error participates in software calculating, error amount
For a stationary value.Therefore as one of preferred method, comprising:
Using oscillograph test to obtain the current phasor component Id fixed error value and the current phasor component Iq
Fixed error value Iq '；
The fixed error of the phase current values is calculated according to the fixed error value Id ', the fixed error value Iq '
According to the fixed errorTo the phase current valuesCarry out deviation compensation.
In the present embodiment, the phase current values estimated by software can be with actual value under different size of current, partially
Difference is constant always, since hardware error is a fixed value, then leads to have the fixed fixed error value Id ', described solid
Determine error amount Iq '；Therefore, the fixed error of the phase current valuesThe fixed error of the phase current values exists
When each out-of-phase current calculates, it is involved in calculating.
Therefore the stabilization deviation for passing through actual measurement and software estimated value is compensated estimated value partially by software compensation program
After difference, the phase current values of as actual compressor, to calibrated by deviation compensation method to improve and calculate standard
Exactness.
Matched with first embodiment of the invention is the electric current computing system of compressor, is implemented for executing the present invention first
The method of example, comprising:
Three-phase electricity flow valuve computing module for reconstructing three-phase current according to the current sampling data of acquisition, and is calculated
The three-phase electricity flow valuve of compressor；
Electric current coordinate transformation module, for the three-phase electricity flow valuve to be carried out Clark transformation, Park is converted, and is compressed
Current phasor component Id, the Iq of machine phase current under rotor coordinate；
First current calculation module, for phase current values to be calculated according to described current phasor component Id, Iq
Preferably, the three-phase electricity flow valuve computing module, is used for:
By the bus of single resistance connect compressor to obtain the current sampling data；
Three-phase current reconstruct is carried out according to the current sampling data, and the three-phase electricity flow valuve is calculated.
Preferably, further includes:
Error measurement module obtains the fixed error value of the current phasor component Id for testing using oscillograph, and
The fixed error value Iq ' of the current phasor component Iq；
Error calculating module, it is described for being calculated according to the fixed error value Id ', the fixed error value Iq '
The fixed error of phase current values
Deviation compensating module, for according to the fixed errorTo the phase current valuesCarry out deviation compensation.
Second embodiment of the invention:
On the basis of first embodiment of the invention, the method for first embodiment of the invention is applied to the frequency conversion of compressor
The calculating of driving plate input current, as shown in Figure 3 and Figure 4, method includes:
S201, the voltage sample data reconstruction three-phase voltage according to acquisition, and the three-phase voltage value of compressor is calculated.
In the present embodiment, using the technology of single resistance sampling reconstruct three-phase voltage, the three-phase voltage value of compressor is obtained,
By the bus of single resistance connect compressor to obtain the voltage sample data, single resistance sampling data are sent to three-phase weight
In structure module, so that three-phase voltage reconstruct is carried out according to the voltage sample data, so that meter is counted by the MCU of frequency conversion drive plate
Calculation obtains the three-phase voltage value.
S202, the three-phase voltage value is carried out to Clark transformation, Park transformation, obtains compressor phase voltage and is sat in rotor
Voltage vector component Vd, Vq under mark system；
In the present embodiment, the MCU of frequency conversion drive plate passes through the Clark of three phase transformation two-phases according to the three-phase voltage value
The Park of coordinate transformation and rest frame to rotor rotating coordinate system converts, and available compressor phase current is in rotor coordinate
Vd the and Vq shaft voltage vector component fastened.
S203, according to the voltage vector component Vd, Vq, described current phasor component Id, Iq, be calculated two it is orthogonal
The conjunction performance number of power vector
In the present embodiment, since Id the and Iq shaft current vector component is relative to rotor coordinate, 2 electric currents
The modulus value of 2 voltage vectors of vector sum is DC quantity and angle is 90 DEG C, and the power vector for then calculating separately d axis component is Pd
After the power vector Pq=Vq+Iq of=Vd+Id and q axis component, by Pythagorean theorem, two quadrature power vectors are calculated
Conjunction power be
S204, the phase voltage value U that compressor is obtained using voltage sample module.
S205, according to the conjunction performance numberPhase current values are calculated in the phase voltage value U
I=P/U.
The embodiment of the present invention obtains three-phase electricity flow valuve, the three-phase voltage value of compressor using vector control method, passes through seat
The conjunction power of compressor is calculated in mark transform method, and the phase voltage value U of module is then used according to the voltage, without
Phase line is passed through using current transformer, and then is eliminated because of current transformer bring cost problem and technological problems.
Preferably, when calculating the input current value of frequency conversion drive plate of compressor, pass through the frequency conversion of compressor
Driving plate obtains the three-phase electricity flow valuve and the three-phase voltage value of compressor using vector control method；
The voltage sample module collects the input voltage of the frequency conversion drive plate of the compressor, and by the input
Phase voltage value U of the voltage as the compressor, to obtain the frequency conversion of the compressor by the phase current values I=P/U
The input current value of driving plate, the phase current values are the input current value of the frequency conversion drive plate.
Matched with second embodiment of the invention is the electric current computing system of compressor, is implemented for executing the present invention second
The method of example, comprising:
Three-phase electricity flow valuve computing module for reconstructing three-phase current according to the current sampling data of acquisition, and is calculated
The three-phase electricity flow valuve of compressor；
Electric current coordinate transformation module, for the three-phase electricity flow valuve to be carried out Clark transformation, Park is converted, and is compressed
Current phasor component Id, the Iq of machine phase current under rotor coordinate；
First current calculation module, for phase current values to be calculated according to described current phasor component Id, Iq
Three-phase voltage value computing module for the voltage sample data reconstruction three-phase voltage according to acquisition, and is calculated
The three-phase voltage value of compressor；
Voltage coordinate conversion module, for the three-phase voltage value to be carried out Clark transformation, Park is converted, and is compressed
Voltage vector component Vd, the Vq of machine phase voltage under rotor coordinate；
Power computation module is closed, for according to the voltage vector component Vd, Vq, described current phasor component Id, Iq, meter
Calculation obtains the conjunction performance number of two quadrature power vectors
Voltage sample module, for obtaining the phase voltage value U of compressor using voltage sample module；
Second current calculation module, for according to the conjunction performance numberThe phase voltage value U
Phase current values I=P/U is calculated.
Preferably, when calculating the input current value of frequency conversion drive plate of compressor,
The three-phase electricity flow valuve and the institute of compressor are obtained using vector control method by the frequency conversion drive plate of compressor
State three-phase voltage value；
The voltage sample module collects the input voltage of the frequency conversion drive plate of the compressor, and by the input
Phase voltage value U of the voltage as the compressor, to obtain the frequency conversion of the compressor by the phase current values I=P/U
The input current value of driving plate.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (10)
1. a kind of current calculation method of compressor, which is characterized in that at least include the following steps:
Three-phase current is reconstructed according to the current sampling data of acquisition, and the three-phase electricity flow valuve of compressor is calculated；
The three-phase electricity flow valuve is subjected to Clark transformation, Park transformation, obtains electricity of the compressor phase current under rotor coordinate
Flow vector component Id, Iq；
Phase current values are calculated according to described current phasor component Id, Iq
2. the current calculation method of compressor as described in claim 1, which is characterized in that the method also includes:
According to the voltage sample data reconstruction three-phase voltage of acquisition, and the three-phase voltage value of compressor is calculated；
The three-phase voltage value is subjected to Clark transformation, Park transformation, obtains electricity of the compressor phase voltage under rotor coordinate
Press vector component Vd, Vq；
According to the voltage vector component Vd, Vq, described current phasor component Id, Iq, two quadrature power vectors are calculated
Conjunction performance number
The phase voltage value U of compressor is obtained using voltage sample module；
According to the conjunction performance numberPhase current values I=P/U is calculated in the phase voltage value U.
3. the current calculation method of compressor as claimed in claim 1 or 2, which is characterized in that the electric current according to acquisition
Sampled data reconstructs three-phase current, and the three-phase electricity flow valuve of compressor is calculated, specifically:
By the bus of single resistance connect compressor to obtain the current sampling data；
Three-phase current reconstruct is carried out according to the current sampling data, and the three-phase electricity flow valuve is calculated.
4. the current calculation method of compressor as described in claim 1, which is characterized in that the method also includes:
It tests to obtain the fixed error value of the current phasor component Id and consolidating for the current phasor component Iq using oscillograph
Determine error amount Iq '；
The fixed error of the phase current values is calculated according to the fixed error value Id ', the fixed error value Iq '
According to the fixed errorTo the phase current valuesCarry out deviation compensation.
5. the current calculation method of compressor as claimed in claim 2, which is characterized in that in the frequency conversion drive for calculating compressor
When the input current value of plate, the three-phase electricity flow valuve and institute are obtained using vector control method by the frequency conversion drive plate of compressor
State three-phase voltage value；
The voltage sample module collects the input voltage of the frequency conversion drive plate, and using the input voltage as described in
The phase voltage value U of compressor, so that the phase current values I=P/U is the input current value of the frequency conversion drive plate.
6. a kind of electric current computing system of compressor characterized by comprising
For reconstructing three-phase current according to the current sampling data of acquisition, and compression is calculated in three-phase electricity flow valuve computing module
The three-phase electricity flow valuve of machine；
Electric current coordinate transformation module, for the three-phase electricity flow valuve to be carried out Clark transformation, Park is converted, and obtains compressor phase
Current phasor component Id, the Iq of electric current under rotor coordinate；
First current calculation module, for phase current values to be calculated according to described current phasor component Id, Iq
7. the electric current computing system of compressor as claimed in claim 6, which is characterized in that further include:
For the voltage sample data reconstruction three-phase voltage according to acquisition, and compression is calculated in three-phase voltage value computing module
The three-phase voltage value of machine；
Voltage coordinate conversion module, for the three-phase voltage value to be carried out Clark transformation, Park is converted, and obtains compressor phase
Voltage vector component Vd, the Vq of voltage under rotor coordinate；
Power computation module is closed, for calculating according to the voltage vector component Vd, Vq, described current phasor component Id, Iq
To the conjunction performance number of two quadrature power vectors
Voltage sample module, for obtaining the phase voltage value U of compressor using voltage sample module；
Second current calculation module, for according to the conjunction performance numberThe phase voltage value U is calculated
Obtain phase current values I=P/U.
8. the electric current computing system of compressor as claimed in claims 6 or 7, which is characterized in that the three-phase electricity flow valuve calculates
Module is used for:
By the bus of single resistance connect compressor to obtain the current sampling data；
Three-phase current reconstruct is carried out according to the current sampling data, and the three-phase electricity flow valuve is calculated.
9. the electric current computing system of compressor as claimed in claim 6, which is characterized in that further include:
Error measurement module, for testing to obtain the fixed error value of the current phasor component Id and described using oscillograph
The fixed error value Iq ' of current phasor component Iq；
Error calculating module, for the phase electricity to be calculated according to the fixed error value Id ', the fixed error value Iq '
The fixed error of flow valuve
Deviation compensating module, for according to the fixed errorTo the phase current values
Carry out deviation compensation.
10. the electric current computing system of compressor as claimed in claim 7, which is characterized in that driven in the frequency conversion for calculating compressor
When the input current value of movable plate, the three-phase of compressor is obtained using vector control method by the frequency conversion drive plate of compressor
Current value and the three-phase voltage value；
The voltage sample module collects the input voltage of the frequency conversion drive plate of the compressor, and by the input voltage
As the phase voltage value U of the compressor, so that the phase current values I=P/U is the input current of the frequency conversion drive plate
Value.
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| CN109756167A (en) * | 2017-11-06 | 2019-05-14 | 深圳市蓝海华腾技术股份有限公司 | Evaluation method, controller and the automobile of controller bus current |
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| CN101509694A (en) * | 2009-03-16 | 2009-08-19 | 宁波德斯科电子科技有限公司 | DC frequency converting air-conditioner compressor intelligent controller and control method thereof |
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