CN110277902A - A kind of the input peak current detection and method for limiting of inverter - Google Patents
A kind of the input peak current detection and method for limiting of inverter Download PDFInfo
- Publication number
- CN110277902A CN110277902A CN201910473781.9A CN201910473781A CN110277902A CN 110277902 A CN110277902 A CN 110277902A CN 201910473781 A CN201910473781 A CN 201910473781A CN 110277902 A CN110277902 A CN 110277902A
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- Prior art keywords
- err
- current
- input
- inverter
- delta
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
- B23K9/1006—Power supply
- B23K9/1043—Power supply characterised by the electric circuit
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
Abstract
The present invention relates to welding machine inverter control technology fields, disclose the input peak current detection and method for limiting of a kind of inverter, comprising: wait detection input current I1 periodically；Convert input power device peak electric current I2, reduction formula are as follows: I2=I1*T/t；Input peak point current upper limit value is set as IP, if I2 is greater than IP, calculates Errp=KL*(I2-IP)；If I2 is not more than IP, Errp=0；The compensation rate that Errp is used as；Formula is as follows: Err2=Err1, Err1 are error current, and Err2 is last error；Err1=Iset-(IFB is current/n)；Delta=Ki*Err1+Kp*(Err1-Err2)+Errp, Delta is increment；Delta=Delta/K, K are to adjust limit coefficient；Inverter exports electric current Err_Out=Err_Out+Delta；It is calculated using increment type PI or pid algorithm, when peak point current is more than limit value, control loop meeting negative-feedback compensation limits the input peak point current in next period, improves the reliability of inverter.
Description
Technical field
The present invention relates to welding machine inverter control technology fields, more specifically, it relates to which a kind of inverter is defeated
Enter peak current detection and method for limiting.
Background technique
Existing electric welding machine has inverter mostly, in the working principle of electric welding machine, most of existing inversion electricity
Source is only limited the average value of primary current, to achieve the purpose that limit input power.
In the course of work of existing electric welding machine, the switching power device in inverter constantly can be connected and turn off, but
The electricity operation state that be these switching power devices can significantly change in conducting in inverter, will form transient state electricity
Stream is peak current.
Current most inverter does not have the wink after detection input power device i.e. switching power break-over of device
State electric current, also there is no limit transient current and reduce transient current on inverter reliability bring influence.
Summary of the invention
Problem in view of the prior art, the present invention provide input peak current detection and the limitation side of a kind of inverter
Method has the advantages of capable of limiting peak point current and carrying out negative-feedback compensation, improve inverter reliability.
To achieve the above object, the present invention provides the following technical scheme that
A kind of the input peak current detection and method for limiting of inverter, include the following steps:
Deng the input current I of detection inverter periodically1；
The peak point current I to convert in the input power break-over of device time2, reduction formula are as follows: I2=I1* T/t, wherein T is period, t
For turn-on time, that is, pulse-width regulated amount；
Input peak point current upper limit value is set as IPIf I2Greater than IP, then Errp=K is calculatedL* (I2-IP)；If I2No more than IP, then
Errp=0, wherein KLFor penalty coefficient；Compensation rate of the Errp as input peak point current limitation；
Formula is as follows: Err2=Err1, Err1For error current, Err2For last error；
Err1=Iset(IFBCurrently/ n), IFBCurrentlyFor current calculated primary side input current filter value；
Delta=Ki*Err1+Kp* (Err1-Err2)+Errp, Delta is increment, KiFor integral constant, KpFor proportionality constant；
Delta=Delta/K, K are to adjust limit coefficient；
Inverter exports electric current Err_Out=Err_Out+Delta.
Through the above technical solutions, setting the cycle time of acquisition data, the input for monitoring inverter periodically is waited
Electric current uses increasing using the peak point current being converted into the input power break-over of device period, and according to preset upper limit value
Amount formula PI or pid algorithm calculate, and when peak point current is more than limit value, control loop will do it negative-feedback compensation, limit next
Input peak point current in period, to improve the reliability of inverter.
Further, Err_Out=Err_Max, maximum output Err_ if Err_Out is greater than maximum output
Max；
Err_Out=Err_Min if Err_Out is less than minimum output quantity, minimum output quantity are Err_Min.
Through the above technical solutions, the maxima and minima of limitation Err_Out, avoid allowing Err_Out infinitely become larger or
Person infinitely becomes smaller, and prevents actual equipment overload operation or does not export for a long time.
Further, input current I1By the average value of input current in n period, n is integer.
Through the above technical solutions, the output electric current in calculated next period can be allowed more acurrate using number of cycles.
Further, input current I1By the time in n period and the average value of interior input current, n is non-integer.
Through the above technical solutions, the period of non-integer is allowed to participate in calculating, then the output in calculated next period can be allowed
Electric current more can to welding machine current working current state it is more identical.
Further, only one Errp is calculated every time.
Compared with prior art, it the beneficial effects of the present invention are: setting the cycle time of acquisition data, waits and supervises periodically
The input current for surveying inverter, using the peak point current being converted into the input power break-over of device period, and according to pre-
If upper limit value, calculated using increment type PID algorithm, when peak point current be more than limit value when, control loop will do it negative-feedback
Compensation, limits the input peak point current in the next period, to improve the reliability of inverter.
Detailed description of the invention
Fig. 1 is the method flow diagram of the embodiment of the present invention.
Specific embodiment
With reference to the accompanying drawings and examples, the present invention will be described in detail.
Embodiment
A kind of the input peak current detection and method for limiting of inverter, as shown in Figure 1, including the following steps:
Deng the input current I of detection inverter periodically1.Period is welding equipment reverse frequency, such as 50Khz inversion frequency
Rate, sampling period 20ms.
The peak point current I to convert in the input power break-over of device time2, reduction formula are as follows: I2=I1* T/t, wherein T is week
Phase, t are turn-on time, that is, pulse-width regulated amount in the period；Input current I1For the average value of input current in the period.
Input peak point current upper limit value is set as IPIf I2Greater than IP, then Errp=K is calculatedL* (I2-IP)；If I2It is not more than
IP, then Errp=0, wherein KLFor penalty coefficient；Compensation rate of the Errp as input peak point current limitation；In different time sections
K in ErrpLCan not be identical, and difference KLWith different compensation effects, the anti-interference ability of formula can be improved.
Formula is as follows: Err2=Err1, Err1For error current, Err2For last error；
Err1=Iset(IFBCurrently/ n), IFBCurrentlyFor current calculated primary side input current filter value；
Delta=Ki*Err1+Kp* (Err1-Err2)+Errp, Delta is increment, KiFor integral constant, KpFor proportionality constant；
Delta=Delta/K, K are to adjust limit coefficient.
Inverter exports regulated quantity Err_Out=Err_Out+Delta.
Err_Out=Err_Max, maximum output Err_Max if Err_Out is greater than maximum output；If Err_
Out is less than minimum output quantity then Err_Out=Err_Min, and minimum output quantity is Err_Min.Err_Min < IP≤Err_Max。
The maxima and minima for limiting Err_Out, avoids that Err_Out is allowed infinitely to become larger or infinitely become smaller.
The cycle time for setting acquisition data waits the input current for monitoring inverter periodically, defeated using being converted into
Enter the peak point current in power device turn-on time section, and according to preset upper limit value, uses increment type PI or pid algorithm
It calculates, when peak point current is more than limit value, control loop will do it negative-feedback compensation, limit the input peak value in the next period
Electric current, to improve the reliability of inverter.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (5)
1. the input peak current detection and method for limiting of a kind of inverter, which comprises the steps of:
Deng the input current I of detection inverter periodically1；
The peak point current I to convert in the input power break-over of device time2, reduction formula are as follows: I2=I1* T/t, wherein T is period, t
For turn-on time, that is, pulse-width regulated amount；
Input peak point current upper limit value is set as IPIf I2Greater than IP, then Errp=K is calculatedL* (I2-IP)；If I2No more than IP, then
Errp=0, wherein KLFor penalty coefficient；Compensation rate of the Errp as input peak point current limitation；
Formula is as follows: Err2=Err1, Err1For error current, Err2For last error；
Err1=Iset(IFBCurrently/ n), IFBCurrentlyFor current calculated primary side input current filter value；
Delta=Ki*Err1+Kp* (Err1-Err2)+Errp, Delta is increment, KiFor integral constant, KpFor proportionality constant；
Delta=Delta/K, K are to adjust limit coefficient；
Inverter exports regulated quantity Err_Out=Err_Out+Delta.
2. the input peak current detection and method for limiting of inverter according to claim 1, which is characterized in that if
Err_Out is greater than maximum output then Err_Out=Err_Max, maximum output Err_Max；
Err_Out=Err_Min if Err_Out is less than minimum output quantity, minimum output quantity are Err_Min.
3. the input peak current detection and method for limiting of inverter according to claim 2, which is characterized in that input
Electric current I1By the average value of input current in n period, n is integer.
4. the input peak current detection and method for limiting of inverter according to claim 1, which is characterized in that input
Electric current I1By the time in n period and the average value of interior input current, n is non-integer.
5. the input peak current detection and method for limiting of inverter according to claim 1, which is characterized in that every time
Calculate only one Errp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910473781.9A CN110277902B (en) | 2019-06-01 | 2019-06-01 | Method for detecting and limiting input peak current of inverter power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910473781.9A CN110277902B (en) | 2019-06-01 | 2019-06-01 | Method for detecting and limiting input peak current of inverter power supply |
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| CN110277902A true CN110277902A (en) | 2019-09-24 |
| CN110277902B CN110277902B (en) | 2021-02-09 |
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| CN201910473781.9A Active CN110277902B (en) | 2019-06-01 | 2019-06-01 | Method for detecting and limiting input peak current of inverter power supply |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1154282A (en) * | 1995-09-20 | 1997-07-16 | 宫地技术株式会社 | Inverter seam resistance welding electric power supply apparatus |
| US5748462A (en) * | 1995-08-02 | 1998-05-05 | Miyachi Technos Corporation | Apparatus for controlling inverter resistance welding |
| US9853566B2 (en) * | 2015-06-01 | 2017-12-26 | Lsis Co., Ltd. | System for driving inverters in parallel |
-
2019
- 2019-06-01 CN CN201910473781.9A patent/CN110277902B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5748462A (en) * | 1995-08-02 | 1998-05-05 | Miyachi Technos Corporation | Apparatus for controlling inverter resistance welding |
| CN1154282A (en) * | 1995-09-20 | 1997-07-16 | 宫地技术株式会社 | Inverter seam resistance welding electric power supply apparatus |
| US9853566B2 (en) * | 2015-06-01 | 2017-12-26 | Lsis Co., Ltd. | System for driving inverters in parallel |
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| CN110277902B (en) | 2021-02-09 |
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