CN117811353A - Power semiconductor module and power conversion system - Google Patents
Power semiconductor module and power conversion system Download PDFInfo
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- CN117811353A CN117811353A CN202410231990.3A CN202410231990A CN117811353A CN 117811353 A CN117811353 A CN 117811353A CN 202410231990 A CN202410231990 A CN 202410231990A CN 117811353 A CN117811353 A CN 117811353A
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 49
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 22
- 238000001914 filtration Methods 0.000 claims abstract description 14
- 239000003990 capacitor Substances 0.000 claims description 70
- 238000005070 sampling Methods 0.000 claims description 65
- 238000000605 extraction Methods 0.000 claims description 27
- 230000003321 amplification Effects 0.000 claims description 11
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 11
- 238000012545 processing Methods 0.000 claims description 4
- 230000009467 reduction Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 9
- 238000013461 design Methods 0.000 description 6
- 239000000758 substrate Substances 0.000 description 6
- 230000007935 neutral effect Effects 0.000 description 5
- 238000007789 sealing Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
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- 230000007547 defect Effects 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
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- 230000003071 parasitic effect Effects 0.000 description 1
- 238000004382 potting Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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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
- H02M1/123—Suppression of common mode voltage or current
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
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- Electromagnetism (AREA)
- Power Conversion In General (AREA)
Abstract
The invention provides a power semiconductor module and a power conversion system, wherein the power semiconductor module comprises a package body, and a power unit and an active filter unit which are arranged in the package body; the power unit is used for converting direct current and alternating current; the active filtering unit is connected with the power unit and is used for extracting the noise of the designated frequency band of the common mode noise signal of the DC side or the AC side of the power unit to obtain a reverse noise signal, and correspondingly reinjecting the reverse noise signal to the DC side or the AC side of the power unit to eliminate the noise. The invention solves the problems of large volume and high cost of the existing noise reduction scheme.
Description
Technical Field
The present invention relates to the field of integrated circuit design, and in particular, to a power semiconductor module and a power conversion system.
Background
The power semiconductor module is widely applied to the field of energy conversion, and is different from a traditional linear power supply, the power converter formed by the power semiconductor module works in a PWM-modulated high-frequency switch working state, and the high-frequency switch working state can enable the power converter to generate high-frequency noise.
EMC electromagnetic compatibility related standards define the amplitude of common mode and differential mode noise output by the power converter. To meet the certification, it is currently common practice to meet the relevant standards by adding an EMI filter assembly, but external EMI filter assemblies are bulky, costly, and present a significant challenge to the application in the relevant field.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a power semiconductor module and a power conversion system for solving the problems of large volume and high cost of the existing noise reduction scheme.
To achieve the above and other related objects, the present invention provides a power semiconductor module including:
the power unit and the active filter unit are arranged in the package body;
the power unit is used for converting direct current and alternating current;
the active filtering unit is connected with the power unit and is used for extracting the noise of the designated frequency band of the common mode noise signal of the direct current side or the alternating current side of the power unit to obtain a reverse noise signal, and the reverse noise signal is correspondingly reinjected to the direct current side or the alternating current side of the power unit to eliminate the noise.
Optionally, the power unit comprises a single-phase converter or a three-phase converter, wherein the three-phase converter comprises a three-phase three-wire converter or a three-phase four-wire converter.
Optionally, the active filtering unit includes: a noise sampling part, a noise extracting part, a driving amplifying part and a noise reinjection part;
the noise sampling part is connected with the power unit and is used for sampling primary noise signals of the direct current side or the alternating current side of the power unit;
the noise extraction part is connected with the noise sampling part and is used for eliminating the differential mode component in the primary noise signal to obtain the common mode noise signal, and carrying out noise extraction of a specified frequency band on the common mode noise signal to obtain a reverse extraction signal;
the driving amplification part is connected with the noise extraction part and is used for driving and amplifying the reverse extraction signal to obtain a reverse noise signal;
the noise reinjection part is connected with the driving amplification part and is used for reinjecting the reverse noise signal to the direct current side or the alternating current side of the power unit correspondingly.
Optionally, the noise sampling part includes sampling capacitors, wherein the number of the sampling capacitors is equal to the number of terminals of the direct current side or the alternating current side of the power unit.
Optionally, the noise extraction section includes: the device comprises a signal conditioner, an analog-to-digital converter, a programmable processor and a digital-to-analog converter;
the signal conditioner is connected with the noise sampling part and is used for eliminating the differential mode component in the primary noise signal to obtain the common mode noise signal;
the analog-to-digital converter is connected with the signal conditioner and is used for carrying out analog-to-digital conversion on the common-mode noise signal to obtain a digital common-mode noise signal;
the programmable processor is connected with the analog-to-digital converter and is used for carrying out fast Fourier transform on the digital common-mode noise signal and extracting harmonic signals of a specified frequency band from the digital common-mode noise signal to obtain an extracted signal, and carrying out signal inversion on the extracted signal to obtain a digital reverse extracted signal;
the digital-to-analog converter is connected with the programmable processor and is used for carrying out digital-to-analog conversion on the digital reverse extraction signal to obtain the reverse extraction signal.
Optionally, the signal conditioner performs addition processing on the signal output by the noise sampling part to eliminate a differential mode component to obtain the common mode noise signal; and the programmable processor obtains the extracted signal by carrying out proportional amplification processing of the corresponding proportional coefficient on the harmonic signal.
Optionally, the driving amplifying section includes: a first transistor, a second transistor, a first resistor, a second resistor, and a third resistor; the bases of the first transistor and the second transistor are connected with each other and receive the reverse extraction signal through the first resistor, the collector of the first transistor is connected with the working voltage, the emitter of the first transistor is connected with the emitter of the second transistor through the second resistor and the third resistor in sequence, and the collector of the second transistor is grounded; and a connection node of the second resistor and the third resistor outputs the reverse noise signal.
Optionally, the noise reinjection part includes: the first capacitor, the second capacitor, the third capacitor, the fourth resistor, the fifth resistor and the sixth resistor; one end of the first capacitor receives the reverse noise signal, the other end of the first capacitor is connected with one ends of the second capacitor and the third capacitor, and the fourth resistor is connected in parallel with two ends of the first capacitor; the other end of the second capacitor is used for reinjecting the reverse noise signal to the direct current side or the alternating current side of the power unit through the fourth capacitor, and the fifth resistor is connected in parallel with the two ends of the second capacitor; the other end of the third capacitor is grounded through the sixth resistor.
The invention also provides a power conversion system comprising the power semiconductor module.
Optionally, the power conversion system further comprises a three-phase alternating current source, a passive filter and a direct current source or load; the three-phase alternating current source is connected with the alternating current side of the power semiconductor module through the passive filter, and the direct current source or the load is connected with the direct current side of the power semiconductor module.
As described above, the power semiconductor module and the power conversion system of the invention not only make the design of the active filter unit more compact, but also solve the heat dissipation problem thereof by integrating the active filter unit in the module, thereby being beneficial to improving the working performance, and simultaneously, greatly reducing the size of the external passive filter, and reducing the size of the filtering magnetic ring of the external passive filter to be less than 1/4 of the original size, thereby being beneficial to reducing the cost and the size; in addition, the power semiconductor module has a programmable frequency selecting function, so that noise treatment is more targeted, noise treatment is carried out at the source, standardized design is facilitated, and the power semiconductor module is convenient to use and popularize.
Drawings
Fig. 1 is a schematic package diagram of a power semiconductor module according to the present invention.
Fig. 2 shows an exemplary circuit schematic of the power semiconductor module of the present invention.
Fig. 3 is a schematic circuit diagram of the power semiconductor module shown in fig. 2 when sampling and reinjection electrical connection are implemented externally.
Fig. 4 shows another exemplary circuit schematic of the power semiconductor module of the present invention.
Fig. 5 is a schematic circuit diagram of the power semiconductor module shown in fig. 4 when sampling and reinjection electrical connection are implemented externally.
Fig. 6 shows a schematic circuit diagram of a power semiconductor module according to another exemplary embodiment of the invention.
Fig. 7 is a schematic circuit diagram of the power semiconductor module shown in fig. 6 when sampling and reinjection electrical connection are implemented externally.
Fig. 8 is a schematic circuit diagram of an active filter unit corresponding to the power semiconductor module shown in fig. 2 and 3.
Fig. 9 is a schematic circuit diagram of an active filter unit corresponding to the power semiconductor module shown in fig. 4 and 5.
Fig. 10 is a schematic circuit diagram of an active filter unit corresponding to the power semiconductor module shown in fig. 6 and 7.
Fig. 11 is a schematic circuit diagram of a power conversion system according to the present invention.
Description of element numbers: 10 power semiconductor module, 100 package, 110 package substrate, 120 sealing layer, 200 power unit, 300 active filter unit, 310 noise sampling part, 320 noise extraction part, 321 signal conditioner, 322 analog-to-digital converter, 323 programmable processor, 324 digital-to-analog converter, 330 driving amplifying part, 340 noise reinjection part, 20 three phase alternating current source, 30 passive filter, 40 direct current source or load.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention.
Please refer to fig. 1 to 11. It should be noted that, the illustrations provided in the present embodiment merely illustrate the basic concept of the present invention by way of illustration, and only the components related to the present invention are shown in the drawings rather than the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complex.
The applicant has found by analyzing the power semiconductor module that: the du/dt and di/dt generated by the switching action of the module are noise sources, and the voltage and current of the power device in the module which are rapidly changed during switching can cause the strong change of the du/dt and di/dt, so that strong electromagnetic noise is caused, and electromagnetic interference such as conduction, near-field coupling, far-field coupling and the like is generated by a noise source on other electromagnetic sensitive equipment, so that the whole circuit system cannot reliably work, and even EMC authentication test cannot meet the requirements.
Based on the above findings, the applicant starts from a power semiconductor module as a source of electromagnetic noise, reduces EMI problems caused by the switching action of the module by integrating an active filter unit inside the module, forms a governance at the source of noise, and reduces the electromagnetic noise output by the module.
As shown in fig. 1 to 7, the present embodiment provides a power semiconductor module 10, which includes a package 100, and a power unit 200 and an active filter unit 300 disposed in the package 100.
As shown in fig. 1, the package body 100 includes a package substrate 110 and a sealing layer 120; the power unit 200 and the active filter unit 300 are disposed on the package substrate 110 and sealed by the sealing layer 120. As an alternative, the package substrate 110 includes a ceramic substrate, and the material of the sealing layer 120 includes epoxy.
The active filter unit 300 and the power unit 200 are arranged on the ceramic substrate together and integrated in the module, so that the heat dissipation problem of the active filter unit 300 can be effectively solved, and the working reliability of the active filter unit is improved; meanwhile, the active filter unit 300 is subjected to solid insulation by using a potting or plastic packaging technology, so that the design is more compact, the size of the whole circuit system is reduced, parasitic parameters of the active filter unit can be reduced, the performance of the active filter unit is improved, and the electromagnetic interference of the power semiconductor module 10 to back-end equipment is effectively reduced.
As shown in fig. 2-7, the power unit 200 is configured to convert between dc power and ac power, for example, to convert dc power to ac power or to convert ac power to dc power.
As an example, the power unit 200 includes a single-phase inverter or a three-phase inverter, wherein the three-phase inverter includes a three-phase three-wire system inverter or a three-phase four-wire system inverter. It should be noted that fig. 2-7 only take three-phase converters with two-level topologies as an example, and in practice, other topologies are possible without substantial impact on the present embodiment.
As shown in fig. 2-7, the active filtering unit 300 is connected to the power unit 200, and is configured to perform noise extraction of a specified frequency band on a common mode noise signal on a dc side or an ac side of the power unit 200 to obtain a reverse noise signal, and correspondingly reinject the reverse noise signal to the dc side or the ac side of the power unit 200 to perform noise cancellation.
As an example, as shown in fig. 8 to 10, the active filtering unit 300 includes a noise sampling part 310, a noise extraction part 320, a driving amplification part 330, and a noise reinjection part 340.
The noise sampling part 310 is connected to the power unit 200 for sampling a primary noise signal of the dc side or the ac side of the power unit 200.
In one possible implementation, the noise sampling section 310 is connected to the dc side of the power unit 200 for sampling the primary noise signal of the dc side of the power unit 200, as shown in fig. 2.
Specifically, the noise sampling section 310 includes sampling capacitors, wherein the number of sampling capacitors is equal to the number of terminals on the dc side of the power cell 200.
The dc sides of the single-phase converter and the three-phase converter each have two terminals, such as a v+ terminal and a V-terminal, so that the number of sampling capacitors in the noise sampling portion 310 corresponding to the single-phase converter and the three-phase converter is equal to two, and as shown in fig. 8, the single-phase converter and the three-phase converter include a first sampling capacitor Cs1 and a second sampling capacitor Cs2, which respectively correspond to the two terminals on the dc side of the power unit 200.
In another possible implementation, the noise sampling portion 310 is connected to the ac side of the power unit 200 for sampling the primary noise signal of the ac side of the power unit 200, as shown in fig. 4 and 6.
Specifically, the noise sampling section 310 includes sampling capacitors, the number of which is equal to the number of terminals on the ac side of the power unit 200.
Since the number of terminals on the ac side of the single-phase inverter and the three-phase inverter are different and the number of terminals on the ac side of the three-phase three-wire system inverter and the three-phase four-wire system inverter are also different in the three-phase inverter, the number of sampling capacitors in the noise sampling portion 310 corresponding to each inverter is also different.
For single-phase converters: since the ac side of the single-phase inverter has two terminals, such as a live wire terminal and a neutral wire terminal, the number of sampling capacitors in the noise sampling portion 310 corresponding to the single-phase inverter is two, corresponding to the two terminals of the ac side of the power unit 200, respectively.
For a three-phase three-wire system converter: since the ac side of the three-phase three-wire converter has three terminals, such as a U-phase terminal, a V-phase terminal, and a W-phase terminal, the number of sampling capacitors in the noise sampling portion 310 corresponding to the three-phase three-wire converter is three, and as shown in fig. 9, the three sampling capacitors include a first sampling capacitor Cs1, a second sampling capacitor Cs2, and a third sampling capacitor Cs3, which correspond to the three terminals of the ac side of the power unit 200, respectively.
For a three-phase four-wire converter: since the ac side of the three-phase four-wire converter has four terminals, such as a U-phase terminal, a V-phase terminal, a W-phase terminal, and a neutral line terminal, the number of sampling capacitors in the noise sampling portion 310 corresponding to the three-phase four-wire converter is four, and as shown in fig. 10, the sampling capacitors include a first sampling capacitor Cs1, a second sampling capacitor Cs2, a third sampling capacitor Cs3, and a fourth sampling capacitor Cs4, which correspond to the four terminals of the ac side of the power unit 200, respectively.
In application, the electrical connection between the sampling capacitor and the dc side or ac side terminal of the power unit 200 may be implemented inside the module or outside the module. When the inside of the module is finished, metal wiring can be used for electrical connection, as shown in fig. 2, 4 and 6; when the module is completed outside, a corresponding port needs to be reserved in the module, as shown in fig. 3, 5 and 7.
The noise extraction part 320 is connected to the noise sampling part 310, and is configured to cancel a differential mode component in the primary noise signal to obtain a common mode noise signal, and perform noise extraction of a specified frequency band on the common mode noise signal to obtain a reverse extraction signal.
Specifically, the noise extraction portion 320 includes a signal conditioner 321, an analog-to-digital converter 322, a programmable processor 323, and a digital-to-analog converter 324.
The signal conditioner 321 is connected to the noise sampling section 310, and is configured to cancel a differential mode component in the primary noise signal to obtain a common mode noise signal. The signal conditioner 321 eliminates the differential mode component by adding the signals (such as the signals output by the sampling capacitors) output by the noise sampling portion 310 to obtain a common mode noise signal, and in practice, the signal conditioner 321 may perform the adding process after performing the filtering process on the signals output by the sampling capacitors.
The analog-to-digital converter 322 is connected to the signal conditioner 321, and is configured to perform analog-to-digital conversion on the common-mode noise signal to obtain a digital common-mode noise signal.
The programmable processor 323 is connected to the analog-to-digital converter 322, and is configured to perform a fast fourier transform on the digital common mode noise signal, extract a harmonic signal of a specified frequency band from the digital common mode noise signal to obtain an extracted signal, and perform signal inversion on the extracted signal to obtain a digital inverted extracted signal.
The programmable processor 323 obtains the extracted signal by performing a proportional amplification process on the harmonic signal with a corresponding proportional coefficient, where the proportional coefficient is greater than 0 and less than or equal to 1.
For the DC side sampling scheme, whether it is a single-phase converter or a three-phase converter, the programmable processor 323 obtains an extracted signal by 1/2 of the proportional amplification of the harmonic signal, i.e., the proportionality coefficient is equal to 1/2.
For the ac side sampling scheme, if the power unit 200 includes a single-phase converter or a three-phase four-wire converter, the programmable processor 323 directly uses the harmonic signal as the extraction signal, i.e., the scaling factor is equal to 1; if the power unit 200 includes a three-phase three-wire converter, the programmable processor 323 obtains an extracted signal by performing 1/3 of the proportional amplification processing on the harmonic signal, i.e., the proportionality coefficient is equal to 1/3.
As an alternative, programmable processor 323 includes a Field Programmable Gate Array (FPGA); the frequency selection function of the active filter unit 300, that is, setting a specified frequency band, can be realized by programming the FPGA, so that noise cancellation of the specified frequency band according to the noise requirement of the user is realized. In practice, a programming port PR is reserved in the module to facilitate programming of the FPGA.
The digital-to-analog converter 324 is coupled to the programmable processor 323 for digital-to-analog conversion of the digital back-extracted signal to obtain a back-extracted signal.
The driving amplifying section 330 is connected to the noise extracting section 320 for driving amplifying the reverse extracted signal to obtain a reverse noise signal.
Specifically, the driving amplifying section 330 includes a first transistor Q1, a second transistor Q2, a first resistor R1, a second resistor R2, and a third resistor R3.
The bases of the first transistor Q1 and the second transistor Q2 are connected with each other and receive a reverse extraction signal through a first resistor R1, the collector of the first transistor Q1 is connected with an operating voltage, the emitter of the second transistor Q2 is connected with the emitter of the third transistor R3 through a second resistor R2 and a third resistor R3 in sequence, and the collector of the second transistor Q2 is grounded; wherein, the connection node of the second resistor R2 and the third resistor R3 outputs an inverse noise signal.
The noise reinjection part 340 is connected to the driving amplification part 330 for reinjecting the reverse noise signal to the direct current side or the alternating current side of the power unit 200, respectively.
Specifically, the noise reinjection portion 340 includes a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6.
One end of the first capacitor C1 receives the reverse noise signal, the other end of the first capacitor C1 is connected with one ends of the second capacitor C2 and the third capacitor C3, and the fourth resistor R4 is connected in parallel with two ends of the first capacitor C1; the other end of the second capacitor C2 is used for reinjecting the reverse noise signal to the direct current side or the alternating current side of the power unit 200 via the fourth capacitor C4, and the fifth resistor R5 is connected in parallel to two ends of the second capacitor C2; the other end of the third capacitor C3 is grounded via a sixth resistor R6.
In fact, when the different converters perform noise reinjection, the types and the numbers of the terminals corresponding to the reinjection are slightly different, and at this time, the number of the fourth capacitors C4 may be one or a plurality (for example, equal to the number of the reinjection terminals), which has no substantial influence on the embodiment.
When the number of the fourth capacitors C4 is one, the terminals of each reinjection correspond to the fourth capacitor C4, that is, the reverse noise signal is reinjected to each corresponding terminal through the fourth capacitor C4, regardless of whether the number of reinjected terminals is one or plural.
When the number of fourth capacitances C4 is plural, as in the case of the number of terminals of the reinjection being equal:
for the dc side sampling scheme, the noise reinjection part 340 reinjects the reverse noise signal to the dc side of the power unit 200; as described above, the dc sides of the single-phase inverter and the three-phase inverter each have two terminals, and thus the number of the fourth capacitors C4 is two, corresponding to the two terminals of the dc side of the power unit 200, respectively, as shown in fig. 8.
For the ac side sampling scheme, the noise reinjection section 340 reinjects the inverted noise signal to the ac side of the power unit 200. For a three-phase three-wire system converter without a neutral line, the noise reinjection section 340 reinjects the reverse noise signal to the U, V, W phase terminal on the ac side of the power unit 200, at which time the number of fourth capacitors C4 is three, as shown in fig. 9. For a single-phase converter and a three-phase four-wire converter having a neutral line, the noise reinjection section 340 reinjects the reverse noise signal to the neutral line terminal of the ac side of the power unit 200, at which time the number of fourth capacitors C4 is one, as shown in fig. 10.
As shown in fig. 11, the present embodiment further provides a power conversion system, which includes the power semiconductor module 10 described above, and further includes a three-phase ac source 20, a passive filter 30, and a dc source or load 40.
The three-phase ac source 20 is connected to the ac side of the power semiconductor module 10 via a passive filter 30, and the dc source or load 40 is connected to the dc side of the power semiconductor module 10.
Compared with the conventional power conversion system (i.e., the power semiconductor module only includes the power unit, and noise suppression is performed by providing the external passive filter component), the size of the passive filter 30 can be greatly reduced by integrating the active filter unit 300 in the power semiconductor module 10, so that the size of the filtering magnetic ring of the passive filter 30 is reduced to 1/4 or less, which is beneficial to reducing the size and cost.
In summary, according to the power semiconductor module and the power conversion system, the active filtering unit is integrated in the module, so that the active filtering unit is more compact in design, the heat dissipation problem of the active filtering unit is solved, the working performance is improved, meanwhile, the size of the external passive filter can be greatly reduced, the size of a filtering magnetic ring of the external passive filter is reduced to be less than 1/4 of the original size, and the cost and the size are reduced; in addition, the power semiconductor module has a programmable frequency selecting function, so that noise treatment is more targeted, noise treatment is carried out at the source, standardized design is facilitated, and the power semiconductor module is convenient to use and popularize. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (9)
1. A power semiconductor module, the power semiconductor module comprising:
the power unit and the active filter unit are arranged in the package body;
the power unit is used for converting direct current and alternating current;
the active filtering unit is connected with the power unit and is used for extracting the noise of a designated frequency band from the common mode noise signal of the DC side or the AC side of the power unit to obtain a reverse noise signal, and correspondingly reinjecting the reverse noise signal to the DC side or the AC side of the power unit to eliminate the noise;
wherein the active filtering unit includes: a noise sampling part, a noise extracting part, a driving amplifying part and a noise reinjection part;
the noise sampling part is connected with the power unit and is used for sampling primary noise signals of the direct current side or the alternating current side of the power unit;
the noise extraction part is connected with the noise sampling part and is used for eliminating the differential mode component in the primary noise signal to obtain the common mode noise signal, and carrying out noise extraction of a specified frequency band on the common mode noise signal to obtain a reverse extraction signal;
the driving amplification part is connected with the noise extraction part and is used for driving and amplifying the reverse extraction signal to obtain a reverse noise signal;
the noise reinjection part is connected with the driving amplification part and is used for reinjecting the reverse noise signal to the direct current side or the alternating current side of the power unit correspondingly.
2. The power semiconductor module of claim 1, wherein the power unit comprises a single-phase converter or a three-phase converter, wherein the three-phase converter comprises a three-phase three-wire converter or a three-phase four-wire converter.
3. The power semiconductor module according to claim 1, wherein the noise sampling section includes sampling capacitors, wherein the number of sampling capacitors is equal to the number of terminals on the dc side or the ac side of the power cell.
4. The power semiconductor module according to claim 1, wherein the noise extraction section includes: the device comprises a signal conditioner, an analog-to-digital converter, a programmable processor and a digital-to-analog converter;
the signal conditioner is connected with the noise sampling part and is used for eliminating the differential mode component in the primary noise signal to obtain the common mode noise signal;
the analog-to-digital converter is connected with the signal conditioner and is used for carrying out analog-to-digital conversion on the common-mode noise signal to obtain a digital common-mode noise signal;
the programmable processor is connected with the analog-to-digital converter and is used for carrying out fast Fourier transform on the digital common-mode noise signal and extracting harmonic signals of a specified frequency band from the digital common-mode noise signal to obtain an extracted signal, and carrying out signal inversion on the extracted signal to obtain a digital reverse extracted signal;
the digital-to-analog converter is connected with the programmable processor and is used for carrying out digital-to-analog conversion on the digital reverse extraction signal to obtain the reverse extraction signal.
5. The power semiconductor module according to claim 4, wherein the signal conditioner obtains the common-mode noise signal by adding signals output from the noise sampling section to cancel differential-mode components; and the programmable processor obtains the extracted signal by carrying out proportional amplification processing of the corresponding proportional coefficient on the harmonic signal.
6. The power semiconductor module according to claim 1, wherein the driving amplifying section includes: a first transistor, a second transistor, a first resistor, a second resistor, and a third resistor; the bases of the first transistor and the second transistor are connected with each other and receive the reverse extraction signal through the first resistor, the collector of the first transistor is connected with the working voltage, the emitter of the first transistor is connected with the emitter of the second transistor through the second resistor and the third resistor in sequence, and the collector of the second transistor is grounded; and a connection node of the second resistor and the third resistor outputs the reverse noise signal.
7. The power semiconductor module of claim 1, wherein the noise reinjection portion comprises: the first capacitor, the second capacitor, the third capacitor, the fourth resistor, the fifth resistor and the sixth resistor; one end of the first capacitor receives the reverse noise signal, the other end of the first capacitor is connected with one ends of the second capacitor and the third capacitor, and the fourth resistor is connected in parallel with two ends of the first capacitor; the other end of the second capacitor is used for reinjecting the reverse noise signal to the direct current side or the alternating current side of the power unit through the fourth capacitor, and the fifth resistor is connected in parallel with the two ends of the second capacitor; the other end of the third capacitor is grounded through the sixth resistor.
8. A power conversion system, characterized in that the power conversion system comprises a power semiconductor module according to any of claims 1-7.
9. The power conversion system according to claim 8, further comprising a three-phase alternating current source, a passive filter, and a direct current source or load; the three-phase alternating current source is connected with the alternating current side of the power semiconductor module through the passive filter, and the direct current source or the load is connected with the direct current side of the power semiconductor module.
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| CN209399538U (en) * | 2018-01-31 | 2019-09-17 | 大金工业株式会社 | Electronic component unit and air-conditioning device |
| CN111244956A (en) * | 2020-02-24 | 2020-06-05 | 广东电科院能源技术有限责任公司 | Tunable wave filtering device and system and harmonic filtering method |
| US20210313876A1 (en) * | 2020-04-07 | 2021-10-07 | Texas Instruments Incorporated | Active noise filtering for switch mode power supplies |
| DE102021102950A1 (en) * | 2021-02-09 | 2022-08-11 | Avl Software And Functions Gmbh | Active filter in the semiconductor module |
| CN116325407A (en) * | 2020-09-30 | 2023-06-23 | 大金工业株式会社 | Power conversion device |
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| CN209399538U (en) * | 2018-01-31 | 2019-09-17 | 大金工业株式会社 | Electronic component unit and air-conditioning device |
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| US20210313876A1 (en) * | 2020-04-07 | 2021-10-07 | Texas Instruments Incorporated | Active noise filtering for switch mode power supplies |
| CN116325407A (en) * | 2020-09-30 | 2023-06-23 | 大金工业株式会社 | Power conversion device |
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