CN109713983A - Over Current Protection System, controller and over-current protection method - Google Patents
Over Current Protection System, controller and over-current protection method Download PDFInfo
- Publication number
- CN109713983A CN109713983A CN201811636383.6A CN201811636383A CN109713983A CN 109713983 A CN109713983 A CN 109713983A CN 201811636383 A CN201811636383 A CN 201811636383A CN 109713983 A CN109713983 A CN 109713983A
- Authority
- CN
- China
- Prior art keywords
- current
- input
- motor
- power
- over
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Control Of Ac Motors In General (AREA)
Abstract
The present invention relates to a kind of Over Current Protection System, controller and over-current protection method, this Over Current Protection System includes: the AC-DC conversion efficiency that electric efficiency diagram database is suitable for matching controller of the respective model motor under the torque of this operating point and revolving speed according to the torque of a certain operating point of motor, revolving speed；Motor power calculation unit is suitable for obtaining power input to a machine according to input voltage, the electric current of motor；Input power predicting unit is suitable for going out according to power input to a machine and AC-DC conversion efficiency calculation the ac input power of controller；Input voltage predicting unit, which is suitable for obtaining to exchange with DC bus-bar voltage according to ac input power, actually enters voltage；Input current predicting unit is suitable for actually entering voltage according to ac input power and exchange and obtaining and actually enter alternating current；Input current limitation protection location is suitable for basis and actually enters alternating current progress current-limiting protection.
Description
Technical field
The present invention relates to Motor Control Fields, and in particular to a kind of Over Current Protection System, controller and over-current protection method.
Background technique
For motor control, the alternating current that actually enters for needing to monitor in real time motor carries out overcurrent protection, but traditional
Mode is the way acquisition electric current that current sensor etc. is added in the line and increases hardware, which improves testing cost.
Therefore, it is necessary to design the Over Current Protection System and over-current protection method of a kind of low cost.
Summary of the invention
The object of the present invention is to provide a kind of Over Current Protection System, controller and over-current protection methods.
In order to solve the above-mentioned technical problems, the present invention provides a kind of Over Current Protection Systems, comprising:
Electric efficiency diagram database, motor power calculation unit, input power predicting unit, input voltage prediction are single
Member, input current predicting unit and input current limit protection location；Wherein
The electric efficiency diagram database is suitable for matching respective model according to the torque of a certain operating point of motor, revolving speed
The AC-DC conversion efficiency of controller of the motor under the torque of this operating point and revolving speed；
The motor power calculation unit is suitable for obtaining power input to a machine according to input voltage, the electric current of motor；
The input power predicting unit is suitable for going out to control according to power input to a machine and AC-DC conversion efficiency calculation
The ac input power of device；
The input voltage predicting unit be suitable for being obtained according to ac input power with DC bus-bar voltage exchange it is actually defeated
Enter voltage；
The input current predicting unit is suitable for actually entering voltage according to ac input power and exchange and obtaining reality
Input AC electric current；
The input current limitation protection location is suitable for basis and actually enters alternating current progress current-limiting protection.
Another aspect, the present invention also provides a kind of for controlling the controller of motor rotation, is equipped in the controller
Over Current Protection System.
Further, the controller is suitable for the Over Current Protection System.
The third aspect, the present invention also provides a kind of over-current protection methods, comprising:
It obtains to exchange with DC bus-bar voltage according to ac input power and actually enters voltage, and
It actually enters voltage according to ac input power and exchange and obtains and actually enter alternating current；
Current-limiting protection is carried out according to alternating current is actually entered.
Further, the preparation method of the ac input power includes:
AC-DC conversion efficiency is obtained by look-up table；And
Power input to a machine is obtained according to the input voltage of motor, electric current；And
Go out the ac input power of controller according to power input to a machine and AC-DC conversion efficiency calculation.
Further, the method for obtaining AC-DC conversion efficiency by look-up table includes:
Establish an electric efficiency diagram database；
Respective model is matched in the electric efficiency diagram database according to the torque of a certain operating point of motor, revolving speed
The AC-DC conversion efficiency of controller of the motor under the torque of this operating point and revolving speed.
Further, include: according to the method for actually entering alternating current progress current-limiting protection
Setting electric current threshold value, when it is described actually enter alternating current and reach current threshold when, then reduce motor speed.
The invention has the advantages that Over Current Protection System and over-current protection method of the invention can accurately monitor reality
Border input AC electric current is enable to respond quickly especially when motor load changes, and is turned by current regulation motor
Speed avoids motor overload.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is the functional block diagram of Over Current Protection System of the invention；
Fig. 2 is of the invention actually enters when alternating current carries out current-limiting protection and the relational graph of motor speed.
Specific embodiment
In conjunction with the accompanying drawings, the present invention is further explained in detail.These attached drawings are simplified schematic diagram, only with
Illustration illustrates basic structure of the invention, therefore it only shows the composition relevant to the invention.
Fig. 1 is the functional block diagram of Over Current Protection System of the invention；
As shown in Figure 1, present embodiments providing a kind of Over Current Protection System, comprising: electric efficiency diagram database, motor
Power calculation unit, input power predicting unit, input voltage predicting unit, input current predicting unit and input current limit
Protection location processed；Wherein the electric efficiency diagram database is suitable for being matched according to the torque of a certain operating point of motor, revolving speed
The AC-DC conversion efficiency eta of controller of the respective model motor under the torque of this operating point and revolving speed；The power of motor meter
Unit is calculated suitable for the input voltage V according to motord,q, electric current Id,qMultiplication obtains power input to a machine Pmotor, in the present embodiment
Middle input voltage Vd,q, electric current Id,qThe specially virtual value of motor input；The input power predicting unit is suitable for according to motor
Input power PmotorThe ac input power P of controller is calculated with AC-DC conversion efficiency etain；The input voltage prediction
Unit is suitable for according to ac input power PinWith DC bus-bar voltage VDCShow that exchange actually enters voltage Vin；The input electricity
Predicting unit is flowed to be suitable for according to ac input power PinAnd exchange actually enters voltage VinIt obtains and actually enters alternating current
Iin；The input current limitation protection location is suitable for basis and actually enters alternating current progress current-limiting protection.
Related ac input power P in the present embodimentinThe power of motor is input to for controller.
It is suitable for pre-establishing electric efficiency diagram database in the present embodiment, which includes motor model and the types
The homologous thread of number motor corresponding torque, revolving speed and AC-DC conversion efficiency eta under corresponding revolving speed；By motor model with
And the motor model finds the AC-DC conversion of adaptation in certain the corresponding torque of revolving speed (operating point), revolving speed from response curve
Efficiency eta.
By input power PmotorAc input power P can be obtained divided by AC-DC conversion efficiency etain。
Exchange is obtained for input voltage predicting unit and actually enters voltage VinIt can also be realized using look-up table, specifically
, pre-establish ac input power PinWith DC bus-bar voltage VDCCorresponding exchange actually enters voltage VinRelation curve
Figure, according to the ac input power P of inputinWith DC bus-bar voltage VDCIt is real that corresponding exchange is searched on above-mentioned relation curve
Border input voltage Vin。
For input current predicting unit by ac input power PinVoltage V is actually entered divided by exchangeinIt can obtain
Actually enter alternating current Iin。
Fig. 2 is of the invention actually enters when alternating current carries out current-limiting protection and the relational graph of motor speed.
As shown in Fig. 2, in the present embodiment, the input current limitation protection location is suitable for setting electric current threshold value, work as institute
It states when actually entering alternating current and reaching current threshold, then reduces motor speed.
Specifically, when determining to actually enter alternating current IinWhen greater than current threshold, the Over Current Protection System can lead to
Corresponding control module limiting motor revolving speed is crossed, after motor band, which carries, to be changed, although motor speed not will increase, in order to avoid
Actually enter alternating current IinIt is lasting to increase, motor speed is reduced so as to actually enter alternating current IinReduction, it is then right again
Motor speed carries out speed limit, if actually entering alternating current IinAfter persistently reducing and being lower than current threshold, motor speed limit is contacted.
The present embodiment additionally provides a kind of controller rotated for controlling motor, is equipped with above-mentioned overcurrent in the controller
Protection system.
On the basis of above-mentioned Over Current Protection System, the present embodiment additionally provides a kind of over-current protection method, comprising:
According to ac input power PinWith DC bus-bar voltage VDCShow that exchange actually enters voltage Vin, and according to friendship
Flow input power PinAnd exchange actually enters voltage VinIt obtains and actually enters alternating current Iin；According to actually entering alternating current
Flow IinCarry out current-limiting protection.
The ac input power PinPreparation method include: by look-up table obtain AC-DC conversion efficiency eta；And root
According to the input voltage V of motord,q, electric current Id,qObtain power input to a machine Pmotor；And according to power input to a machine Pmotor
The ac input power P of controller is calculated with AC-DC conversion efficiency etain。
The method for obtaining AC-DC conversion efficiency by look-up table includes: to establish an electric efficiency diagram database；
Respective model motor is matched herein in the electric efficiency diagram database according to the torque of a certain operating point of motor, revolving speed
The torque of operating point and the AC-DC conversion efficiency eta of the controller under revolving speed.
It include: setting electric current threshold value according to the method that alternating current carries out current-limiting protection is actually entered, when the reality is defeated
When entering alternating current and reaching current threshold, then motor speed is reduced.
Working principle and the course of work about over-current protection method is similar to Over Current Protection System, and details are not described herein again.
In conclusion this Over Current Protection System and over-current protection method pass through electric efficiency diagram database, power of motor
Computing unit, input power predicting unit, input voltage predicting unit, input current predicting unit and input current limitation are protected
Shield unit match, calculate corresponding intermediate quantity, finally obtain it is true, accurately actually enter alternating current, especially in motor
It when load changes, is enable to respond quickly, and by current regulation motor speed, avoids motor overload.
Taking the above-mentioned ideal embodiment according to the present invention as inspiration, through the above description, relevant staff is complete
Various changes and amendments can be carried out without departing from the scope of the technological thought of the present invention' entirely.The technology of this invention
Property range is not limited to the contents of the specification, it is necessary to which the technical scope thereof is determined according to the scope of the claim.
Claims (7)
1. a kind of Over Current Protection System characterized by comprising
It is electric efficiency diagram database, motor power calculation unit, input power predicting unit, input voltage predicting unit, defeated
Enter current forecasting unit and input current limitation protection location；Wherein
The electric efficiency diagram database is suitable for matching respective model motor according to the torque of a certain operating point of motor, revolving speed
The AC-DC conversion efficiency of controller under the torque of this operating point and revolving speed；
The motor power calculation unit is suitable for obtaining power input to a machine according to input voltage, the electric current of motor；
The input power predicting unit is suitable for going out controller according to power input to a machine and AC-DC conversion efficiency calculation
Ac input power；
The input voltage predicting unit, which is suitable for obtaining to exchange with DC bus-bar voltage according to ac input power, actually enters electricity
Pressure；
The input current predicting unit is suitable for actually entering voltage according to ac input power and exchange and obtaining and actually enter
Alternating current；
The input current limitation protection location is suitable for basis and actually enters alternating current progress current-limiting protection.
2. a kind of for controlling the controller of motor rotation, which is characterized in that be equipped with Over Current Protection System in the controller.
3. controller according to claim 2, which is characterized in that the controller is suitable for using as described in claim 1
Over Current Protection System.
4. a kind of over-current protection method characterized by comprising
It obtains to exchange with DC bus-bar voltage according to ac input power and actually enters voltage, and
It actually enters voltage according to ac input power and exchange and obtains and actually enter alternating current；
Current-limiting protection is carried out according to alternating current is actually entered.
5. over-current protection method according to claim 4, which is characterized in that
The preparation method of the ac input power includes:
AC-DC conversion efficiency is obtained by look-up table；And
Power input to a machine is obtained according to the input voltage of motor, electric current；And
Go out the ac input power of controller according to power input to a machine and AC-DC conversion efficiency calculation.
6. over-current protection method according to claim 5, which is characterized in that
It is described by look-up table obtain AC-DC conversion efficiency method include:
Establish an electric efficiency diagram database；
Respective model motor is matched in the electric efficiency diagram database according to the torque of a certain operating point of motor, revolving speed
The AC-DC conversion efficiency of controller under the torque of this operating point and revolving speed.
7. over-current protection method according to claim 6, which is characterized in that
Include: according to the method that alternating current carries out current-limiting protection is actually entered
Setting electric current threshold value, when it is described actually enter alternating current and reach current threshold when, then reduce motor speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811636383.6A CN109713983A (en) | 2018-12-29 | 2018-12-29 | Over Current Protection System, controller and over-current protection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811636383.6A CN109713983A (en) | 2018-12-29 | 2018-12-29 | Over Current Protection System, controller and over-current protection method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109713983A true CN109713983A (en) | 2019-05-03 |
Family
ID=66259572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811636383.6A Pending CN109713983A (en) | 2018-12-29 | 2018-12-29 | Over Current Protection System, controller and over-current protection method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109713983A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102281011A (en) * | 2011-08-30 | 2011-12-14 | 江苏物联网研究发展中心 | Single-phase inversion frequency conversion power supply based on sine modulation wave |
| US20140203747A1 (en) * | 2013-01-23 | 2014-07-24 | Juhyoung LEE | Motor control apparatus and method |
| CN107276388A (en) * | 2017-06-30 | 2017-10-20 | 广东美的制冷设备有限公司 | Pfc circuit and transducer air conditioning |
| CN107733312A (en) * | 2017-10-23 | 2018-02-23 | 北京新能源汽车股份有限公司 | Electric machine controller and its DC bus current detection method, device and electric automobile |
| CN108599662A (en) * | 2018-05-31 | 2018-09-28 | 浙江众邦机电科技有限公司 | A kind of sewing machine and its motor braking control method and system |
-
2018
- 2018-12-29 CN CN201811636383.6A patent/CN109713983A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102281011A (en) * | 2011-08-30 | 2011-12-14 | 江苏物联网研究发展中心 | Single-phase inversion frequency conversion power supply based on sine modulation wave |
| US20140203747A1 (en) * | 2013-01-23 | 2014-07-24 | Juhyoung LEE | Motor control apparatus and method |
| CN107276388A (en) * | 2017-06-30 | 2017-10-20 | 广东美的制冷设备有限公司 | Pfc circuit and transducer air conditioning |
| CN107733312A (en) * | 2017-10-23 | 2018-02-23 | 北京新能源汽车股份有限公司 | Electric machine controller and its DC bus current detection method, device and electric automobile |
| CN108599662A (en) * | 2018-05-31 | 2018-09-28 | 浙江众邦机电科技有限公司 | A kind of sewing machine and its motor braking control method and system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102577094B (en) | Controller and method for estimating, managing, and diagnosing motor parameters | |
| CN105474532B (en) | The system and method for rotor time constant online recognition in AC induction machines | |
| CN102710188B (en) | Direct torque control method and device of brushless continuous current dynamo | |
| CN104081657B (en) | Power control | |
| CN104038138B (en) | Controller for motor, heat pump and air conditioner | |
| CN106549620B (en) | A kind of Speed Sensorless Induction Motor vector control system low frequency processing method | |
| CN104993761B (en) | The method and a device for controlling weak magnetism of permanent-magnet brushless DC electric machine | |
| CN106645880A (en) | Method and device for estimating ripple current of capacitor, control method and device for variable frequency air-conditioner, frequency converter and variable frequency air-conditioner | |
| CN108712126A (en) | Applied to the bus current method of estimation in electric machine controller | |
| CN101001075B (en) | Torque control device and method of DC variable frequency compressor | |
| CN107947674A (en) | A kind of switched reluctance machines multiobjective optimization control method | |
| CN102223059B (en) | Control method and control device for voltage source inverter brake circuit | |
| EP2744099A1 (en) | A control system to realize input power changing along with both loads and rotate speed by an inverter bridge dragging many sets of motors | |
| CN106505925A (en) | Motor q axle inductance offline identification methods | |
| CN105790669B (en) | Optimal energy-saving voltage tracking method for asynchronous motor | |
| CN105353220B (en) | The discrimination method of threephase asynchronous electric parameters | |
| US9800139B2 (en) | Motor control system and method for input current protection | |
| Kini et al. | Performance analysis of centrifugal pumps subjected to voltage variation and unbalance | |
| CN109713983A (en) | Over Current Protection System, controller and over-current protection method | |
| CN105007005A (en) | Brushless direct current motor speed adjusting system | |
| CN108631626A (en) | A kind of model prediction direct Power Control method based on fuzzy control | |
| CN106549613A (en) | A kind of current control method of brshless DC motor | |
| CN105634363A (en) | High-input power factor control method for single-phase to three-phase inverter motor drive system | |
| CN203131180U (en) | Control system for electric actuating mechanism of valve | |
| CN110019173B (en) | Equipment energy efficiency control method for big data |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190503 |
|
| RJ01 | Rejection of invention patent application after publication |