CN104753324B - Avoid the device and method of input filter resonance - Google Patents
Avoid the device and method of input filter resonance Download PDFInfo
- Publication number
- CN104753324B CN104753324B CN201310740917.0A CN201310740917A CN104753324B CN 104753324 B CN104753324 B CN 104753324B CN 201310740917 A CN201310740917 A CN 201310740917A CN 104753324 B CN104753324 B CN 104753324B
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- common mode
- mode current
- input
- icm
- resonance
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Classifications
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- 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
- H02M1/12—Arrangements for reducing harmonics from ac input or output
-
- 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
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/123—Suppression of common mode voltage or current
Abstract
There is provided a kind of apparatus and method for avoiding input filter resonance in PWM switch modulation drivers.Described device, including：Common mode current sensor（10）, sensing input common mode current（Icm）；Modulus converter A/D（20）, by the input common mode current sensed（Icm）It is converted into data signal；And microcontroller（30）, by the input common mode current from modulus converter A/D 20（Icm）Digital value be compared with threshold value, according to comparative result, reduce the switching frequency of inverter（Fsw）So that the switching frequency of inverter（Fsw）Less than the common mode resonance frequency of input filter（Fc）, to cause input filter to avoid resonance.
Description
Technical field
This invention relates generally to a kind of device and method for being used to avoid input filter resonance.More particularly, to
A kind of device and the side that avoid PWM switch modulation driver input filters that resonance occurs in the switching frequency range of driver
Method.
Background technology
The driver of motor be typically the civil power or commercial power of input are filtered, rectification, inversion are handled and
There is suitable voltage, the driving source of frequency needed for drive motor.Wherein need access defeated in the importation of driver
Enter wave filter to meet the requirement in terms of EMC, the inversion of usually used PWM high switching frequency in the inversion processing of driver
Adjust to obtain suitable driving source.
Fig. 1 shows the input filter of driver.Fig. 2 shows the common mode current path of driver input filter.
Referring to Fig. 1, L1 is common-mode inductor, also referred to as common mode choke, and it has leakage inductance Ldiff and common mode inductance
Lcm.X capacitors Cxa, Cxb therein constitutes π type differential mode filters together with L1 leakage inductance Ldiff, leakage inductance Ldiff's
Inductance value is very small, about the 1%~5% of common mode inductance Lcm, therefore the resonant frequency of differential mode filter is very high, beyond
Switching frequency in PWM used in the inversion processing of driver, PWM used in the inversion processing of driver
Switching frequency is usually 2kHz~16kHz.
Common mode inductance Lcm constitutes common mode filter together with Y capacitor Cy, motor parasitic capacitance Cm, cable parasitic capacitance Cc
Ripple device, common mode inductance Lcm inductance value is typically in the range of 0.2uH~15mH, and the resonant frequency of common-mode filter is relatively low, and
And the resonant frequency of common-mode filter additionally depends on the cable length and motor parasitic capacitance of motor, therefore, common mode filter
The resonant frequency Fc of ripple device is in the switching frequency range in PWM used in the inversion processing of driver in most cases
Within.
When changing motor cable length according to Client application situation, cable parasitic capacitance Cc is also with change, therefore
The resonant frequency Fc of common-mode filter will with change, and common-mode filter resonant frequency Fc as common mode choke
L1 such as ± 30% tolerance and change.
Due to Y capacitor Cy compared with motor parasitic capacitance Cm, cable parasitic capacitance Cc it is smaller, can be ignored,
So the resonant frequency Fc that we can obtain common-mode filter is：
The resonant frequency Fc of common-mode filter is within the scope of one, rather than a fixed value.
Fig. 2 shows the common mode current path of driver input filter.Referring to Fig. 2, when the resonance frequency of common-mode filter
When rate Fc is equal with the switching frequency Fsw in PWM used in the inversion processing of driver, input filter will occur
Resonance, produces very big common mode current Icm, so as to cause common mode choke L1 core satarations so that input filter loses filter
Except the function of noise, and common mode current Icm can also increase, and common mode current Icm can flow into the power supply powered for driver,
So as to cause EMC to disturb.IT jumper in wherein Fig. 1,2（Wire jumper）Equivalent to one switch, the Y capacitor when it is closed
Cy can access wave filter there is provided the path of a common mode current, and when it disconnects, Y capacitor Cy is disconnected, all common mode electricity
Flow the input power that can all stimulate the menstrual flow.
The purpose of the present invention is exactly monitoring input common mode current to avoid input filter by adjusting above-mentioned switching frequency
Device resonance, so as to improve EMC robustness of the driver of motor in different application.
The content of the invention
According to an aspect of the present invention input filter resonance in PWM switch modulation drivers is avoided there is provided a kind of
Device, including：Common mode current sensor, sensing input common mode current；Modulus converter A/D, by the input common mode sensed electricity
Circulation changes data signal into；And microcontroller, by the digital value of the input common mode current from modulus converter A/D 20
It is compared with threshold value, according to comparative result, reduces the switching frequency of inverter so that the switching frequency of inverter is less than input
The common mode resonance frequency of wave filter, to cause input filter to avoid resonance.
Wherein, common mode current sensor uses current transformer.
Wherein, common mode current sensor is sleeved on the cable before the rectifier bridge of driver and input filter.
Wherein, microcontroller is the microcontroller shared with driver.
Wherein, threshold value is 3 times of maximum of input common mode current, the maximum of input common mode current be finger actuator just
Often work, input filter do not have the maximum that common mode current is inputted during resonance.
Wherein, common mode current sensor is placed on the power path of driver, modulus converter A/D and microcontroller
MCU is placed in the control section circuit of driver.
According to another aspect of the present invention input filter resonance in PWM switch modulation drivers is avoided there is provided one kind
Method, including：Sensing input common mode current；The input common mode current sensed and a threshold value are compared；According to comparing
As a result, the switching frequency of inverter is reduced so that the switching frequency of inverter is less than the common mode resonance frequency of input filter, with
So that input filter avoids resonance.
Wherein described comparison step includes：If the input common mode current sensed is less than threshold value, sensing input is returned
Common mode current；If the input common mode current received is more than or equal into threshold value, the Converting Unit PWM of driver is gradually reduced
The switching frequency of modulation, until untill the input common mode current that specific times are sensed is respectively less than threshold value.
Wherein, threshold value is 3 times of maximum of input common mode current, the maximum of input common mode current be finger actuator just
Often work, input filter do not have the maximum that common mode current is inputted during resonance, and specific times are 5 times.
Brief description of the drawings
By following merely illustrative example of and write description with reference to accompanying drawing, come for the technical staff of this area one
Say, example embodiment of the invention is best understood from and become apparent from, in accompanying drawing：
Fig. 1 shows the input filter of motor driver.
Fig. 2 shows the common mode current path of the input filter of motor driver.
Fig. 3 shows the structure chart of the device for avoiding input filter resonance according to the present invention.
Fig. 4 shows the work flow diagram of the method for avoiding input filter resonance according to the present invention.
Fig. 5 shows the artificial circuit figure of the present invention.
Fig. 6,7,8 show the imitative of the switching frequency Fsw of the PWM of the Converting Unit of adjust drivers three kinds of situations
True result.
Embodiment
The design philosophy of the present invention is monitoring input common mode current to judge the working condition of input filter, and is based on
The input common mode current monitored avoids input filter resonance by adjusting above-mentioned switching frequency, so as to improve motor
EMC robustness of the driver in different application.
The present invention is described in detail below by Fig. 3-8.
Fig. 3 shows the structure chart of the device for avoiding input filter resonance according to the present invention.According to keeping away for the present invention
Exempting from the device of input filter resonance includes：Using current transformer（ZCT）ZCT sensors 10, modulus converter A/D 20,
Microcontroller 30.
ZCT sensors 10 are sleeved on the cable before the rectifier bridge of motor driver and input filter, for feeling
Survey input common mode current Icm.The input common mode current Icm sensed is converted into data signal to carry by modulus converter A/D 20
Supply microcontroller 30.Microcontroller 30 can be the microcontroller shared with driver, if MCU30 is detected
Digital value to the input common mode current Icm received increases suddenly, is greater than inputting the 3 of common mode current Icm maximum
Times, then MCU30 reduces the switching frequency Fsw of the PWM of the Converting Unit of driver, so that input filter is total to
Mould resonant frequency Fc is more than the switching frequency Fsw of the PWM of driver Converting Unit, and then input filter is avoided resonance
（Saturation）Condition, now, due to departing from saturation conditions, so input common mode current Icm can decline, common mode choke L1 temperature
Degree is with decline, when common mode choke L1 temperature is less than its Curie temperature, the common mode choke L1 of input filter magnetic
Characteristic will be recovered, so that avoiding input filter loses the function of filtering out noise.
Needed to be placed in motor driving according to the ZCT sensors 10 of the device for avoiding input filter resonance of the present invention
On the input power path of device, according to the modulus converter A/D 20 of the device for avoiding input filter resonance of the present invention and micro-
Controller MCU30 can be placed in the control section circuit of motor driver.
Fig. 4 shows the work flow diagram of the method for avoiding input filter resonance according to the present invention.
In step S41, sensing input common mode current Icm.
In step S42, the input common mode current Icm sensed is compared with a threshold value, the threshold value is, for example, input
3 times of common mode current Icm maximum, wherein input common mode current Icm maximum is finger actuator normal work, input filter
Ripple device does not have the maximum that common mode current Icm is inputted during resonance.If the input common mode current Icm received is less than into threshold value,
Then return to step S41；If the input common mode current Icm received is more than or equal into threshold value, then it is assumed that input filter is present
Resonance, proceeds to step S43.
In step S43, making the switching frequency Fsw of the PWM of the Converting Unit of driver reduces a specific frequency, for example
0.2kHz, then proceeds to step S44.
In step S44, with the specific times sensing input common mode current Icm of such as 5 times, step S45 is then proceeded to.
In step S45, judge whether the input common mode current Icm sensed with specific times has sensing value at least one times big
In threshold value, if it is, returning to step S43, continue to reduce the switching frequency Fsw of the PWM of the Converting Unit of driver.
If the input common mode current Icm respectively less than threshold values sensed with specific times, this method is terminated in step S46.
As an example, Fig. 5 shows the artificial circuit figure of the present invention, Fig. 6,7,8 show the inverting part of adjust drivers
The simulation result of the switching frequency Fsw for the PWM divided three kinds of situations.
In figure 6, switching frequency Fsw=5035Hz of PWM, resonant frequency Fc=5035Hz of input filter, this
When input filter produce resonance, input common mode current Icm maximums are 34.9A, input common mode current Icm effective average value
For 22.1A.
In the figure 7, switching frequency Fsw=4500Hz of PWM, resonant frequency Fc=5035Hz of input filter, this
When input filter do not produce resonance, input common mode current Icm maximums are 23.2A, and input common mode current Icm's is effectively average
It is worth for 10.9A.
In fig. 8, switching frequency Fsw=4000Hz of PWM, resonant frequency Fc=5035Hz of input filter, this
When input filter do not produce resonance, input common mode current Icm maximums are 11.7A, and input common mode current Icm's is effectively average
It is worth for 5.7A.
It can be seen that according to the present invention and can effectively be kept away by adjusting above-mentioned switching frequency from Fig. 6-8 simulation result
Exempt from the resonance of input filter, greatly reduce input common-mode current value, so as to improve the input filter of the driver of motor
The EMC robustness of ripple device.
Although the present invention is illustrated by taking motor driver as an example, it should be apparent that application of the invention is not limited
In electric device driver.
Although so describing above example embodiment, it will be understood that can carry out it is various modification, replace and/or
Change.Change and/or change it will be understood by those skilled in the art that other can be carried out to specific embodiment, without departing from such as wide
The spirit or scope of the present invention described generally.Therefore, no matter which point the present embodiment will be considered illustrative from the point of view of
Rather than it is restricted.
Claims (10)
1. a kind of device for avoiding input filter resonance in PWM switch modulation drivers, including：
Common mode current sensor (10), sensing input common mode current (Icm)；
Modulus converter A/D (20), data signal is converted into by the input common mode current (Icm) sensed；And
Microcontroller (30), will digital value and threshold value from the input common mode current (Icm) of modulus converter A/D (20)
It is compared, according to comparative result, reduces the switching frequency (Fsw) of inverter so that the switching frequency (Fsw) of inverter is less than
The common mode resonance frequency (Fc) of input filter, to cause input filter to avoid resonance.
2. device as claimed in claim 1, wherein
Common mode current sensor (10) uses current transformer.
3. device as claimed in claim 1, wherein
Common mode current sensor (10) is sleeved on the cable before the rectifier bridge of driver and input filter.
4. device as claimed in claim 1, wherein
Microcontroller (30) is the microcontroller shared with driver.
5. device as claimed in claim 1, wherein
Threshold value is 3 times of the maximum of input common mode current (Icm), and the maximum of input common mode current (Icm) is finger actuator
Normal work, input filter do not have the maximum that common mode current (Icm) is inputted during resonance.
6. device as claimed in claim 1, wherein
Common mode current sensor (10) is placed on the power path of driver, modulus converter A/D (20) and microcontroller
(30) it is placed in the control section circuit of driver.
7. a kind of method for avoiding input filter resonance in PWM switch modulation drivers, including：
Sensing input common mode current (Icm)；
The input common mode current (Icm) sensed is compared with a threshold value；
According to comparative result, reduce the switching frequency (Fsw) of inverter so that the switching frequency (Fsw) of inverter is less than input
The common mode resonance frequency (Fc) of wave filter, to cause input filter to avoid resonance.
8. method as claimed in claim 7, wherein the comparison step includes：
If the input common mode current (Icm) sensed is less than threshold value, sensing input common mode current (Icm) is returned；
If the input common mode current (Icm) received is more than or equal to threshold value, the Converting Unit PWM for gradually reducing driver is adjusted
The switching frequency (Fsw) of system, until untill the input common mode current (Icm) that specific times are sensed is respectively less than threshold value.
9. method as claimed in claim 7, wherein
Threshold value is 3 times of the maximum of input common mode current (Icm), and the maximum of input common mode current (Icm) is finger actuator
Normal work, input filter do not have the maximum that common mode current (Icm) is inputted during resonance.
10. method as claimed in claim 8, wherein
Specific times are 5 times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310740917.0A CN104753324B (en) | 2013-12-27 | 2013-12-27 | Avoid the device and method of input filter resonance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310740917.0A CN104753324B (en) | 2013-12-27 | 2013-12-27 | Avoid the device and method of input filter resonance |
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| CN104753324A CN104753324A (en) | 2015-07-01 |
| CN104753324B true CN104753324B (en) | 2017-08-11 |
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| CN201310740917.0A Active CN104753324B (en) | 2013-12-27 | 2013-12-27 | Avoid the device and method of input filter resonance |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101040427A (en) * | 2004-10-04 | 2007-09-19 | 大金工业株式会社 | Power converter |
| CN101202496A (en) * | 2006-10-06 | 2008-06-18 | 施耐德东芝换流器欧洲公司 | Common-mode filtering device and speed variator comprising such a device |
| CN101710719A (en) * | 2009-12-16 | 2010-05-19 | 上海永大吉亿电机有限公司 | Circuit structure for common-mode inductors with damping resistors applied to energy feedback devices |
| CN103001188A (en) * | 2011-09-07 | 2013-03-27 | 西门子公司 | Method of operating a residual current circuit breaker and residual current circuit breaker for a frequency converter |
-
2013
- 2013-12-27 CN CN201310740917.0A patent/CN104753324B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101040427A (en) * | 2004-10-04 | 2007-09-19 | 大金工业株式会社 | Power converter |
| CN101202496A (en) * | 2006-10-06 | 2008-06-18 | 施耐德东芝换流器欧洲公司 | Common-mode filtering device and speed variator comprising such a device |
| CN101710719A (en) * | 2009-12-16 | 2010-05-19 | 上海永大吉亿电机有限公司 | Circuit structure for common-mode inductors with damping resistors applied to energy feedback devices |
| CN103001188A (en) * | 2011-09-07 | 2013-03-27 | 西门子公司 | Method of operating a residual current circuit breaker and residual current circuit breaker for a frequency converter |
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| Publication number | Publication date |
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| CN104753324A (en) | 2015-07-01 |
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