CN104753324A - Device and method of avoiding resonance of input filter - Google Patents

Device and method of avoiding resonance of input filter Download PDF

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Publication number
CN104753324A
CN104753324A CN201310740917.0A CN201310740917A CN104753324A CN 104753324 A CN104753324 A CN 104753324A CN 201310740917 A CN201310740917 A CN 201310740917A CN 104753324 A CN104753324 A CN 104753324A
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China
Prior art keywords
common mode
input
mode current
icm
resonance
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CN201310740917.0A
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CN104753324B (en
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陈奉国
陈景
连孝藩
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Schneider Toshiba Inverter Europe SAS
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Schneider Toshiba Inverter Europe SAS
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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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Control Of Ac Motors In General (AREA)
  • Power Conversion In General (AREA)

Abstract

The invention provides a device and a method of avoiding resonance of an input filter in a PWM switch modulation driver. The device comprises a common-mode current sensor (10) for sensing input common-mode current (Icm), an analog-digital converter A/D (20) for converting the sensed input common-mode current (Icm) into a digital signal, and a microcontroller MCU (30) for comparing the digital value of the input common-mode current (Icm) from the analog-digital converter A/D (20) with a threshold. According to a comparison result, a switching frequency (Fsw) of an inverter is reduced, the switching frequency (Fsw) of the inverter is smaller than a common-mode resonance frequency (Fc) of the input filter, and the input filter can avoid resonance.

Description

Avoid the device and method of input filter resonance
Technical field
Relate generally to of the present invention is a kind of for avoiding the device and method of input filter resonance.More specifically, the device and method that resonance occurs a kind of PWM of avoiding switch modulation driver input filter in the switching frequency range of driver is related to.
Background technology
The driver of motor normally carries out filtering, rectification, inversion process to obtain the drive source with suitable voltage, frequency needed for drive motor to the civil power inputted or commercial power.Wherein need in the importation of driver access input filter to meet the requirement in EMC, in the inversion process of driver, usually use the inversion of the high switching frequency of PWM adjustment to obtain suitable drive source.
Fig. 1 shows the input filter of driver.Fig. 2 shows the common mode current path of driver input filter.
Be common-mode inductor see Fig. 1, L1, also referred to as common mode choke, it has leakage inductance Ldiff and common mode inductance Lcm.X capacitor Cxa wherein, the leakage inductance Ldiff of Cxb and L1 form π type differential mode filter together, the inductance value of leakage inductance Ldiff is very little, be approximately 1% ~ 5% of common mode inductance Lcm, therefore the resonance frequency of differential mode filter is very high, beyond the switching frequency in the PWM that the inversion process of driver uses, the switching frequency of the PWM that the inversion process of driver uses is generally 2kHz ~ 16kHz.
Common mode inductance Lcm forms common-mode filter together with Y capacitor Cy, motor parasitic capacitance Cm, cable parasitic capacitance Cc, the inductance value of common mode inductance Lcm is generally in the scope of 0.2uH ~ 15mH, the resonance frequency of common-mode filter is lower, and the resonance frequency of common-mode filter also depends on cable length and the motor parasitic capacitance of motor, therefore, within the switching frequency range in the PWM that the inversion process that the resonance frequency Fc of common-mode filter is in most cases in driver uses.
When changing motor cable length according to Client application situation, cable parasitic capacitance Cc is also along with change, therefore the resonance frequency Fc of common-mode filter will along with change, and the resonance frequency Fc of common-mode filter also can change because of the tolerance of such as ± 30% of common mode choke L1.
Because Y capacitor Cy is little, negligible compared with motor parasitic capacitance Cm, cable parasitic capacitance Cc, so the resonance frequency Fc that we can obtain common-mode filter is:
The resonance frequency Fc of common-mode filter is within a scope, instead of a fixed value.
Fig. 2 shows the common mode current path of driver input filter.See Fig. 2, when the resonance frequency Fc of common-mode filter is equal with the switching frequency Fsw in the PWM that the inversion process of driver uses, will resonance be there is in input filter, produce very large common mode current Icm, thus cause common mode choke L1 core sataration, make input filter lose the function of filtering noise, and common mode current Icm also can increase, common mode current Icm can flow into the power supply of powering for driver, thus causes EMC to disturb.IT jumper(wire jumper wherein in Fig. 1,2) be equivalent to a switch, when it is closed, Y capacitor Cy can access filter, provides the path of a common mode current, when it disconnects, Y capacitor Cy is disconnected, and all common mode currents all can stimulate the menstrual flow input power.
Object of the present invention monitors that input common mode current is to avoid input filter resonance by adjusting above-mentioned switching frequency exactly, thus improves the EMC robustness of driver in different application of motor.
Summary of the invention
According to an aspect of the present invention, provide a kind of device avoiding input filter resonance in PWM switch modulation driver, comprising: common mode current sensor, sensing input common mode current; Modulus converter A/D, converts the input common mode current sensed to digital signal; And microcontroller, the digital value of the input common mode current from modulus converter A/D 20 and threshold value are compared, according to comparative result, reduce the switching frequency of inverter, make the switching frequency of inverter be less than the common mode resonance frequency of input filter, avoid resonance to make input filter.
Wherein, common mode current sensor makes 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 the maximum of input common mode current, and the maximum of input common mode current is the maximum that finger actuator normally works, input filter does not have to input during resonance common mode current.
Wherein, common mode current sensor is placed on the power path of driver, and modulus converter A/D and microcontroller are placed in the control section circuit of driver.
According to a further aspect in the invention, provide a kind of method avoiding input filter resonance in PWM switch modulation driver, comprising: sensing input common mode current; Sensed input common mode current and a threshold value are compared; According to comparative result, reduce the switching frequency of inverter, make the switching frequency of inverter be less than the common mode resonance frequency of input filter, avoid resonance to make input filter.
Wherein said comparison step comprises: if the input common mode current sensed is less than threshold value, then return sensing input common mode current; If received input common mode current is more than or equal to threshold value, then progressively reduce the switching frequency of the Converting Unit PWM of driver, until be all less than threshold value with the input common mode current of specific times sensing.
Wherein, threshold value is 3 times of the maximum of input common mode current, and the maximum of input common mode current is the maximum that finger actuator normally works, input filter does not have to input during resonance common mode current, and specific times is 5 times.
Accompanying drawing explanation
By following only exemplarily and description of writing by reference to the accompanying drawings, for one, this area technical staff, example embodiment of the present invention will better be understood and more obvious, 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 according to the structure chart avoiding the device of input filter resonance of the present invention.
Fig. 4 shows according to the work flow diagram avoiding the method for input filter resonance of the present invention.
Fig. 5 shows artificial circuit figure of the present invention.
Fig. 6,7,8 shows the simulation result of three kinds of situations of the switching frequency Fsw of the PWM of the Converting Unit of adjustment driver.
Embodiment
Design philosophy of the present invention monitors that input common mode current is to judge the operating state of input filter, and avoid input filter resonance based on monitored input common mode current by adjusting above-mentioned switching frequency, thus improve the EMC robustness of driver in different application of motor.
The present invention is described in detail below by Fig. 3-8.
Fig. 3 shows according to the structure chart avoiding the device of input filter resonance of the present invention.The device of input filter resonance of avoiding according to the present invention comprises: the ZCT transducer 10, modulus converter A/D 20, the microcontroller 30 that adopt current transformer (ZCT).
ZCT transducer 10 is sleeved on the cable before the rectifier bridge of motor driver and input filter, for sensing input common mode current Icm.Modulus converter A/D 20 converts the input common mode current Icm sensed to digital signal to be supplied to microcontroller 30.Microcontroller 30 can be the microcontroller shared with driver, if MCU30 detects that the digital value of received input common mode current Icm increases suddenly, such as be greater than 3 times of the maximum of input common mode current Icm, then MCU30 makes the switching frequency Fsw of the PWM of the Converting Unit of driver reduce, thus make the common mode resonance frequency Fc of input filter be greater than the switching frequency Fsw of the PWM of driver Converting Unit, and then make input filter avoid resonance (saturated) condition, now, owing to having departed from saturation conditions, so input common mode current Icm can decline, the temperature of common mode choke L1 is along with decline, when the temperature of common mode choke L1 is lower than its Curie temperature, the magnetic characteristic of the common mode choke L1 of input filter will be recovered, thus avoid the function that filtering noise lost by input filter.
The ZCT transducer 10 of the device of input filter resonance of avoiding according to the present invention needs to be placed on the input power path of motor driver, and the modulus converter A/D 20 of the device of input filter resonance and the microcontroller 30 avoided according to the present invention can be placed in the control section circuit of motor driver.
Fig. 4 shows according to the work flow diagram avoiding the method for input filter resonance of the present invention.
In step S41, sensing input common mode current Icm.
In step S42, sensed input common mode current Icm and a threshold value are compared, this threshold value is such as 3 times of the maximum of input common mode current Icm, and the maximum wherein inputting common mode current Icm is the maximum that finger actuator normally works, input filter does not have to input during resonance common mode current Icm.If received input common mode current Icm is less than threshold value, then return step S41; If received input common mode current Icm is more than or equal to threshold value, then thinks that input filter exists resonance, proceed to step S43.
In step S43, make the switching frequency Fsw of the PWM of the Converting Unit of driver reduce a characteristic frequency, such as 0.2kHz, then proceeds to step S44.
In step S44, with the specific times of such as 5 times sensing input common mode current Icm, then proceed to step S45.
In step S45, judge whether have sensing value to be at least one times greater than threshold value with the input common mode current Icm of specific times sensing, if so, then to turn back to step S43, continue the switching frequency Fsw of the PWM of the Converting Unit reducing driver.If be all less than threshold value, then in step S46 method ends with the input common mode current Icm of specific times sensing.
Exemplarily, Fig. 5 shows the simulation result that artificial circuit figure, Fig. 6 of the present invention, 7,8 show three kinds of situations of the switching frequency Fsw of the PWM of the Converting Unit of adjustment driver.
In figure 6, the switching frequency Fsw=5035Hz of PWM, the resonance frequency Fc=5035Hz of input filter, now input filter produces resonance, and input common mode current Icm maximum is 34.9A, and effective mean value of input common mode current Icm is 22.1A.
In the figure 7, the switching frequency Fsw=4500Hz of PWM, the resonance frequency Fc=5035Hz of input filter, now input filter does not produce resonance, and input common mode current Icm maximum is 23.2A, and effective mean value of input common mode current Icm is 10.9A.
In fig. 8, the switching frequency Fsw=4000Hz of PWM, the resonance frequency Fc=5035Hz of input filter, now input filter does not produce resonance, and input common mode current Icm maximum is 11.7A, and effective mean value of input common mode current Icm is 5.7A.
As can be seen from the simulation result of Fig. 6-8, effectively can be avoided the resonance of input filter by the above-mentioned switching frequency of adjustment according to the present invention, greatly reduce input common-mode current value, thus improve the EMC robustness of the input filter of the driver of motor.
Although the present invention is illustrated for motor driver, it is apparent that range of application of the present invention is not limited to electric device driver.
Although as described herein above example embodiment, understanding can have been carried out various amendment, replacement and/or change.It will be understood by those skilled in the art that can carry out other to specific embodiment changes and/or amendment, and do not depart from the spirit or scope of the present invention as broadly described.Therefore, which point all the present embodiment to be thought illustrative and not restrictive from.

Claims (9)

1. avoid a device for input filter resonance in PWM switch modulation driver, comprising:
Common mode current sensor (10), sensing input common mode current (Icm);
Modulus converter A/D (20), converts the input common mode current (Icm) sensed to digital signal; And
Microcontroller (30), the digital value of the input common mode current (Icm) from modulus converter A/D 20 and threshold value are compared, according to comparative result, reduce the switching frequency (Fsw) of inverter, make the switching frequency of inverter (Fsw) be less than the common mode resonance frequency (Fc) of input filter, avoid resonance to make input filter.
2. device as claimed in claim 1, wherein
Common mode current sensor (10) makes 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 the maximum that finger actuator normally works, input filter does not have to input during resonance common mode current (Icm).
6. device as claimed in claim 1, wherein
Common mode current sensor (10) is placed on the power path of driver, and modulus converter A/D (20) and microcontroller (30) are placed in the control section circuit of driver.
7. avoid a method for input filter resonance in PWM switch modulation driver, comprising:
Sensing input common mode current (Icm);
Sensed input common mode current (Icm) and a threshold value are compared;
According to comparative result, reduce the switching frequency (Fsw) of inverter, make the switching frequency of inverter (Fsw) be less than the common mode resonance frequency (Fc) of input filter, avoid resonance to make input filter.
8. method as claimed in claim 7, wherein said comparison step comprises:
If the input common mode current (Icm) sensed is less than threshold value, then return sensing input common mode current (Icm);
If received input common mode current (Icm) is more than or equal to threshold value, then progressively reduce the switching frequency (Fsw) of the Converting Unit PWM of driver, until be all less than threshold value with the input common mode current (Icm) of specific times sensing.
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 the maximum that finger actuator normally works, input filter does not have to input during resonance common mode current (Icm),
Specific times is 5 times.
CN201310740917.0A 2013-12-27 2013-12-27 Avoid the device and method of input filter resonance Active CN104753324B (en)

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Application Number Priority Date Filing Date Title
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Citations (4)

* Cited by examiner, † Cited by third party
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
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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