CN108039815B - Electromagnetic interference suppression circuit and operation method thereof - Google Patents
Electromagnetic interference suppression circuit and operation method thereof Download PDFInfo
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- CN108039815B CN108039815B CN201711354163.XA CN201711354163A CN108039815B CN 108039815 B CN108039815 B CN 108039815B CN 201711354163 A CN201711354163 A CN 201711354163A CN 108039815 B CN108039815 B CN 108039815B
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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
Abstract
The invention discloses an electromagnetic interference suppression circuit and an operation method thereof, and the electromagnetic interference suppression circuit comprises a direct current bus, wherein the direct current bus is connected with a direct current input end of an inverter after passing through magnetic rings respectively used for suppressing common mode interference and suppressing differential mode interference, the output of an alternating current bridge port of the inverter is respectively connected with a three-phase outgoing line of the bridge port through an inductor and a breaker QF1, the three-phase outgoing line of the bridge port is respectively connected with three-phase outgoing line ends A, B and C after passing through a common mode inductor L11, a differential mode inductor L12 and the magnetic rings, and high-frequency interference of each frequency band is suppressed through the magnetic rings and the inductor. Through the mutual cooperation of the common-mode inductor and the differential-mode inductor, a high-frequency suppression device is added at the source of a high-frequency interference source, namely, a mode of adding a common-mode suppression magnetic ring on the filter inductor of the inverter is adopted, so that the electromagnetic interference of the inverter is greatly reduced, the anti-jamming capability of the inverter is effectively improved, the interference to an external power grid is reduced, and the grid-connected operation of equipment is facilitated.
Description
Technical Field
The invention belongs to the technical field of electromagnetic interference suppression, and particularly relates to an electromagnetic interference suppression circuit and an operation method thereof.
Background
At present, more and more countries have adopted the electromagnetic compatibility standard as the evaluation basis of the performance of products such as switching power adapters, chargers, power transformers, photovoltaic inverters, electric vehicle chargers, battery chargers, and the like. More and more countries are beginning to enforce the electromagnetic compatibility standard, especially in the countries of the united states and europe, the electromagnetic compatibility index becomes one of the legal indexes that manufacturers of power electronic equipment must pass, and if the designers of the equipment do not consider the related problems in the initial circuit design, the products finally cannot pass the electromagnetic compatibility test, cannot obtain the related certification, and finally cannot go to the market.
The electromagnetic compatibility technology is a technology for solving the problems related to electromagnetic interference. The electromagnetic compatibility design is designed to suppress (eliminate) electromagnetic interference on small-sized switching power supplies and power electronic equipment, and provides the switching power supplies and the power electronic equipment with operation stability and reliability in severe electromagnetic environments. In recent years, the importance of electromagnetic compatibility design techniques has increased. This is mainly due to two aspects: first, the switching power supply and the power electronic equipment are increasingly complex, and especially, the situation that analog circuits and digital circuits are mixed is more and more, the operating frequency of switching devices is higher and the power of the equipment is higher, so that the interference on the circuits is more serious. If the designer of the circuit does not know the related design technology, the development period of the product is too long, and even high-frequency interference is serious, so that the development fails. Secondly, in order to ensure that the switching power supply and the power electronic equipment reliably work, electromagnetic radiation pollution is reduced, and electromagnetic pollution to a power grid is reduced.
In the design of power electronic equipment such as inverters and the like, a large number of high-frequency power electronic devices are used, and with the increasing requirements on the inverters and the power electronic equipment, the operating frequency of the power electronic devices is also increasing, and accordingly, serious high-frequency interference is brought to a power grid. Through reasonable electromagnetic interference suppression design, the interference of the equipment to the power grid and other equipment can be effectively reduced.
Disclosure of Invention
The present invention provides an emi suppression circuit and an operating method thereof, aiming at the above-mentioned deficiencies in the prior art, and improves the problems of single emi suppression mode, unreasonable filtering position, no mutual matching between filters, etc. used in the current inverter.
The invention adopts the following technical scheme:
an electromagnetic interference suppression circuit comprises a direct current bus, wherein the direct current bus is connected with a direct current input end of an inverter after passing through magnetic rings for suppressing common mode interference and differential mode interference respectively, an alternating current bridge port output of the inverter is connected with a three-phase outgoing line of a bridge port through an inductor and a breaker QF1 respectively, the three-phase outgoing line of the bridge port is connected with a three-phase outgoing line end A, B and a three-phase outgoing line C respectively after passing through a common mode inductor L11, a differential mode inductor L12 and the magnetic rings, and high-frequency interference of each frequency band is suppressed through the magnetic rings and the inductor.
Specifically, the direct current bus comprises a positive bus DC + and a negative bus DC-, the positive bus DC + is connected with the direct current input of the inverter through an inductor L3 and the negative bus DC-is connected with the direct current input of the inverter through an inductor L4, a magnetic ring L1 and a magnetic ring L2 are sequentially arranged between the positive bus DC + and the inductor L3 and between the negative bus DC-and the inductor L4, and the inductor L3 is connected with the inductor L4 through a capacitor C1 and a capacitor C2 in sequence.
Specifically, outgoing lines of an alternating current bridge port of the inverter comprise AO, BO and CO, and the outgoing lines AO, BO and CO are respectively connected with outgoing lines AO1, BO1 and CO1 of a circuit breaker through the circuit breaker QF 1.
Furthermore, an outlet AO of an AC bridge port of the inverter is connected with one end of a filter inductor L8 after passing through a magnetic ring L5, and the other end of the filter inductor L8 is connected with an outlet AO1 of the breaker after passing through a magnetic ring L5 and passing through a breaker QF 1;
an outgoing line BO of an alternating current bridge port of the inverter penetrates through a magnetic ring L6 and then is connected with one end of a filter inductor L9, and the other end of the filter inductor L9 penetrates through a magnetic ring L6 and then is connected with a breaker outgoing line BO1 through a breaker QF 1;
an outlet line CO of an inverter alternating current bridge port penetrates through a magnetic ring L7 and then is connected with one end of a filter inductor L10, and the other end of the filter inductor L10 penetrates through a magnetic ring L5 and then is connected with a breaker outlet line CO1 through a breaker QF 1.
Furthermore, breaker outgoing lines AO1, BO1 and CO1 are respectively connected with three-phase outputs AO2, BO2 and CO2 of a common mode inductor L11 after passing through a three-phase common mode inductor L11, the three-phase outputs AO2, BO2 and CO2 are connected with an input end of a differential mode inductor L12, an output end AO3 penetrates through a magnetic ring L14 to be connected with a leading-out terminal a, an output end BO3 penetrates through a magnetic ring L15 to be connected with a leading-out terminal B, and an output end CO3 penetrates through a magnetic ring L16 to be connected with a leading-out terminal C.
Further, a magnetic ring L13 is arranged between the three-phase outputs AO3, BO3 and CO3 and the outlet ends A, B and C, and the three-phase outputs AO3, BO3 and CO3 jointly penetrate through the magnetic ring L13.
A method of operating an electromagnetic interference suppression circuit, comprising the steps of:
s1, a magnetic ring L1 and a magnetic ring L2 which are good in high-frequency performance are penetrated into the input sides of a positive bus DC + and a negative bus DC-of direct current together, the positive bus DC + and the negative bus DC-are connected with the direct current input of the three-phase inverter, and the magnetic ring L1 and the magnetic ring L2 are used for inhibiting common mode interference;
s2, filtering is carried out on an inductor at the output side of an alternating current bridge port of the inverter by using one or more groups of different magnetic rings to inhibit harmonic waves of each phase, so that high-frequency interference generated by the inductor is locally attenuated;
and S3, a common-mode inductor L11, a differential-mode inductor L12 and a magnetic ring are matched on the alternating current output side of the inverter to suppress high-frequency interference of each frequency band.
Specifically, in step S1, one end of the positive bus DC + is connected to the inductor L3, and one end of the negative bus DC-is connected to the inductor L4 to form a filter loop, and the inductor L3 and the inductor L4 are used to suppress differential mode interference.
Specifically, in step S2, the outgoing line AO of the bridge port passes through the magnetic ring L5 and is filtered by the filter inductor L8, and then the outgoing line of the filter inductor L8 reversely passes through the magnetic ring L5;
leading an outgoing line BO of a bridge port to pass through a magnetic ring L6 and filter through a filter inductor L9, and then leading the outgoing line of the filter inductor L9 to reversely pass through a magnetic ring L6;
and leading the outlet CO of the bridge port to pass through a magnetic ring L7 and filter through a filter inductor L10, and then leading the outlet of the filter inductor L10 to reversely pass through a magnetic ring L7.
Specifically, in step S3, a three-phase common mode inductor L11 is used for suppressing common mode interference on three-phase outgoing lines AO1, BO1, and CO1 of the inverter, the three-phase outgoing lines of the inverter are connected to one end of a common mode inductor L11, a three-phase output of the common mode inductor L11 is connected to input terminals AO2, BO2, and CO2 of a differential mode inductor L12, output terminals AO3, BO3, and CO3 of the differential mode inductor L12 pass through a magnetic ring L13 together, and pass through a magnetic ring L14, a magnetic ring L15, and a magnetic ring L16 to be connected to three-phase outgoing lines A, B and C, respectively.
Compared with the prior art, the invention has at least the following beneficial effects:
the electromagnetic interference suppression circuit of the invention adds a high-frequency suppression device at the source of a high-frequency interference source by the mutual matching of the common-mode inductor and the differential-mode inductor, namely, a mode of adding a common-mode suppression magnetic ring on the filter inductor of the inverter, thereby greatly reducing the electromagnetic interference of the inverter, effectively improving the anti-interference capability of the inverter, reducing the interference to an external power grid and being beneficial to the grid-connected operation of equipment.
Furthermore, the common-mode interference of the output at the direct current side is subjected to the previous-stage suppression through the magnetic rings L1 and L2, the differential-mode interference of the output at the direct current side is subjected to the previous-stage suppression through the magnetic rings L3 and L4, and the interference of the external equipment at the direct current side and the external equipment is effectively suppressed by matching with the filter capacitors C1 and C2.
Furthermore, outgoing lines AO, BO and CO are respectively connected with outgoing lines AO1, BO1 and CO1 of the circuit breaker through a circuit breaker QF1, each path of outgoing lines penetrates through a magnetic ring and then is connected with an inductor, and then penetrates through the magnetic ring and is connected with the circuit breaker, and the magnetic ring is output close to a bridge opening of the inverter as far as possible, namely the AO, BO and CO sides. By the mode, common-mode interference generated by each phase output can be effectively inhibited at a source, and an interference source is inhibited from the source, so that the diffusion of electromagnetic interference is reduced.
Furthermore, the breaker outgoing lines AO1, BO1 and CO1 are connected through a three-phase common mode inductor L11, and are matched with a differential mode inductor L12 to realize the suppression of common mode signals and differential mode signals of lower frequencies in alternating current output interference.
Further, a magnetic ring L13 is arranged between the three-phase outputs AO3, BO3 and CO3 and the outlet ends A, B and C, and inductance exists on the lead due to the fact that the outlet ends are connected with the three-phase outputs through the lead. After the equipment is connected to a power grid, high-frequency spikes can be generated on the wire by high-frequency interference signals output by the power grid and the equipment, so that electromagnetic interference is formed, and the inductance of the wire to the high-frequency signals is increased by adding the magnetic ring L13 and the magnetic rings L14-L16 between the three-phase output and the wire outlet end, so that the electromagnetic interference is reduced.
The invention also discloses an operation method of the electromagnetic interference suppression circuit, wherein a magnetic ring L1 and a magnetic ring L2 with good high-frequency performance are jointly penetrated into the input sides of the direct-current positive bus DC + and the negative bus DC-, the positive bus DC + and the negative bus DC-are connected with the direct-current input of the three-phase inverter, and the magnetic ring L1 and the magnetic ring L2 are used for suppressing common-mode interference; on the inductor at the output side of the AC bridge port of the inverter, one or more groups of different magnetic rings are used for filtering to inhibit harmonic waves of each phase, so that high-frequency interference generated by the inductor is attenuated locally, and interference sources are prevented from diffusing; the common-mode inductor L11, the differential-mode inductor L12 and the magnetic ring are matched to suppress high-frequency interference of each frequency band on the alternating current output side, because the performance of the common-mode inductor, the differential-mode inductor and the magnetic ring with different high-frequency characteristics is different under different frequency bands, harmonic interference of each frequency in a large range cannot be well suppressed by a single inductor, electromagnetic interference of lower frequencies in three-phase output is suppressed by the common-mode inductor L11 and the differential-mode inductor L12, and electromagnetic interference above 1MHz is suppressed by the magnetic ring L13 and the magnetic rings L14-L16.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a schematic diagram of an EMI suppression circuit according to the present invention.
Detailed Description
The invention provides an electromagnetic interference suppression circuit and an operation method thereof, wherein a high-frequency suppression device is added at the source of a high-frequency interference source through mutual matching of a common-mode inductor and a differential-mode inductor, namely, a mode of adding a common-mode suppression magnetic ring on a filter inductor of an inverter is adopted, the electromagnetic interference of the inverter is greatly reduced, the anti-interference capability of the inverter is effectively improved, the interference to an external power grid is reduced, and the grid-connected operation of equipment is facilitated.
Referring to fig. 1, the electromagnetic interference suppression circuit of the present invention includes a dc bus, an inverter and an inductor, the dc bus is connected to the inverter, magnetic rings for suppressing common mode interference and suppressing differential mode interference are respectively disposed between the dc bus and the inverter, an ac bridge port output of the inverter is connected to a three-phase outgoing line of the bridge port through the inductor and a breaker QF1, the three-phase outgoing line of the bridge port is connected to three-phase outgoing line terminals A, B and C through a common mode inductor L11, a differential mode inductor L12 and a magnetic ring, respectively, and high frequency interference of each frequency band is suppressed through the magnetic rings and the inductors made of different materials.
The direct-current bus comprises a positive bus DC + and a negative bus DC-, the positive bus DC + is connected with the direct-current input of the inverter through an inductor L3 and a negative bus DC-is connected with the direct-current input of the inverter through an inductor L4, a magnetic ring L1 and a magnetic ring L2 are sequentially arranged between the positive bus DC + and an inductor L3 and between the negative bus DC-and the inductor L4, and the inductor L3 is connected with an inductor L4 through a capacitor C1 and a capacitor C2 in sequence.
An outgoing line AO of an AC bridge port of the inverter penetrates through a magnetic ring L5 and then is connected with one end of a filter inductor L8, and the other end of the filter inductor L8 penetrates through a magnetic ring L5 and then is connected with a breaker outgoing line AO1 through a breaker QF 1;
an outgoing line BO of an alternating current bridge port of the inverter penetrates through a magnetic ring L6 and then is connected with one end of a filter inductor L9, and the other end of the filter inductor L9 penetrates through a magnetic ring L6 and then is connected with a breaker outgoing line BO1 through a breaker QF 1;
an outlet line CO of an AC bridge port of the inverter penetrates through a magnetic ring L7 and then is connected with one end of a filter inductor L10, and the other end of the filter inductor L10 penetrates through a magnetic ring L5 and then is connected with a breaker outlet line CO1 through a breaker QF 1;
the output lines AO1, BO1 and CO1 are respectively connected with three-phase outputs AO2, BO2 and CO2 of a common mode inductor L11 after passing through a three-phase common mode inductor L11, the three-phase outputs AO2, BO2 and CO2 are connected with the input end of a differential mode inductor L12, the output end AO3 penetrates through a magnetic ring L14 to be connected with a wire outlet end A, the output end BO3 penetrates through a magnetic ring L15 to be connected with a wire outlet end B, and the output end CO3CO2 penetrates through a magnetic ring L16 to be connected with a wire outlet end C.
A magnetic ring L13 is arranged between the three-phase outputs AO3, BO3 and CO3 and the outlet ends A, B and C, and the three-phase outputs AO3, BO3 and CO3 jointly penetrate through the magnetic ring L13.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The electromagnetic interference suppression method specifically comprises the following steps:
s1, a magnetic ring L1 and a magnetic ring L2 which are good in high-frequency performance are penetrated into the input sides of a positive bus DC + and a negative bus DC-of direct current together, then one end of the positive bus DC + is connected with an inductor L3, one end of the negative bus DC-is connected with an inductor L4 to form a filter loop, then the positive bus DC + and the negative bus DC-are connected with the direct current input of the three-phase inverter, the magnetic ring L1 and the magnetic ring L2 are used for inhibiting common mode interference, and the inductor L3 and the inductor L4 are used for inhibiting differential mode interference;
the magnetic rings can be the combination of magnetic rings with different high-frequency characteristics such as iron silicon, iron silicon aluminum or ferrite, and the suppression of common-mode and differential-mode signals with different frequencies or specific frequency bands is realized through the magnetic rings with different materials and characteristics.
S2, on an inductor L8, an inductor L9 and an inductor L10 at the output side of an alternating current bridge port of the inverter, filtering is carried out by using one or more groups of different magnetic rings to suppress harmonic waves of each phase, so that high-frequency interference generated by the inductor is locally attenuated;
after an outgoing line AO of the bridge port passes through a magnetic ring L5 and is filtered by a filter inductor L8, the outgoing line of the filter inductor L8 reversely passes through a magnetic ring L5;
leading an outgoing line BO of a bridge port to pass through a magnetic ring L6 and filter through a filter inductor L9, and leading the outgoing line of the filter inductor L9 to reversely pass through a magnetic ring L6;
and leading the outlet CO of the bridge port to pass through a magnetic ring L7 and filter through a filter inductor L10, and leading the outlet of the filter inductor L10 to reversely pass through a magnetic ring L7.
And S3, harmonic suppression is performed on the alternating current output side of the inverter in a mode of matching a common mode inductor L11 and a differential mode inductor L12 magnetic ring, and high-frequency interference of each frequency band is effectively suppressed through magnetic elements with different high-frequency characteristics.
Three-phase common mode inductors L11 are used on three-phase outgoing lines AO1, BO1 and CO1 of the inverter to suppress common mode interference, the three-phase outgoing lines of the inverter are connected with one end of the common mode inductor L11, the three-phase output of the common mode inductor L11 is connected with input ends AO2, BO2 and CO2 of a differential mode inductor L12, output ends AO3, BO3 and CO3 of the differential mode inductor L12 pass through a magnetic ring L13 together, and the three-phase outgoing lines A, B and C pass through a magnetic ring L14, a magnetic ring L15 and a magnetic ring L16 respectively.
The invention improves the filtering mode used in the existing single-phase and three-phase inverter filtering circuits and carries out harmonic suppression on the interference source of higher harmonics. The magnetic cores and the filters which are not made of materials and have different frequency characteristics are reasonably configured, corresponding suppression devices are additionally arranged at key positions where high-frequency harmonic leakage easily occurs in a circuit, electromagnetic interference is effectively suppressed from an interference source, and the capability of suppressing the high-frequency harmonic emitted by equipment is enhanced, so that the high-frequency interference of the equipment is greatly reduced, the pollution of an inverter to a power grid during grid connection is reduced, the stability and the reliability of the equipment in a severe working environment of an electromagnetic environment are improved, the service life and the safety of the equipment are further improved, and the economic benefit is higher.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (6)
1. An electromagnetic interference suppression circuit is characterized by comprising a direct current bus, wherein the direct current bus is connected with a direct current input end of an inverter after passing through magnetic rings for suppressing common mode interference and differential mode interference respectively, the output of an alternating current bridge port of the inverter is connected with a three-phase outgoing line of the bridge port through an inductor and a breaker QF1 respectively, the three-phase outgoing line of the bridge port is connected with three-phase outgoing line ends A, B and C after passing through a common mode inductor L11, a differential mode inductor L12 and a magnetic ring respectively, and high-frequency interference of each frequency band is suppressed through the magnetic ring and the inductor;
the direct current bus comprises a positive bus DC + and a negative bus DC-, the positive bus DC + is respectively connected with the direct current input of the inverter through an inductor L3 and a negative bus DC-through an inductor L4, a magnetic ring L1 and a magnetic ring L2 are sequentially arranged between the positive bus DC + and an inductor L3 and between the negative bus DC-and the inductor L4, and the inductor L3 is connected with an inductor L4 through a capacitor C1 and a capacitor C2 in sequence;
the outgoing line of the AC bridge port of the inverter comprises AO, BO and CO, the outgoing lines AO, BO and CO are respectively connected with the outgoing lines AO1, BO1 and CO1 of the circuit breakers through QF1, the outgoing line AO of the AC bridge port of the inverter penetrates through a magnetic ring L5 and then is connected with one end of a filter inductor L8, and the outgoing line of the filter inductor L8 penetrates through a magnetic ring L5 in the reverse direction and then is connected with the outgoing line AO1 of the circuit breaker through the circuit breaker QF 1;
an outgoing line BO of an alternating current bridge port of the inverter penetrates through a magnetic ring L6 and then is connected with one end of a filter inductor L9, and an outgoing line of the filter inductor L9 penetrates through a magnetic ring L6 in a reverse direction and then is connected with a breaker outgoing line BO1 through a breaker QF 1;
an outlet line CO of an inverter AC bridge port penetrates through a magnetic ring L7 and then is connected with one end of a filter inductor L10, and an outlet line of the filter inductor L10 penetrates through a magnetic ring L7 in a reverse direction and then is connected with a breaker outlet line CO1 through a breaker QF 1.
2. The EMI suppression circuit as claimed in claim 1, wherein breaker outgoing lines AO1, BO1 and CO1 pass through a three-phase common mode inductor L11 and then are connected to three-phase outputs AO2, BO2 and CO2 of the common mode inductor L11, the three-phase outputs AO2, BO2 and CO2 are connected to an input terminal of a differential mode inductor L12, the output terminal AO3 passes through a magnetic ring L14 and is connected to a leading-out terminal A, the output terminal BO3 passes through a magnetic ring L15 and is connected to a leading-out terminal B, and the output terminal CO3 passes through a magnetic ring L16 and is connected to a leading-out terminal C.
3. The EMI suppression circuit as claimed in claim 2, wherein a magnetic loop L13 is disposed between the three-phase outputs AO3, BO3 and CO3 and the outlet ends A, B and C, and the three-phase outputs AO3, BO3 and CO3 pass through the magnetic loop L13 together.
4. A method of operating an electromagnetic interference suppression circuit, comprising the steps of:
s1, a magnetic ring L1 and a magnetic ring L2 which are good in high-frequency performance are penetrated into the input sides of a positive bus DC + and a negative bus DC-of direct current together, the positive bus DC + and the negative bus DC-are connected with the direct current input of the three-phase inverter, and the magnetic ring L1 and the magnetic ring L2 are used for inhibiting common mode interference;
s2, filtering is carried out on an inductor on the output side of an alternating current bridge port of the inverter by using one or more groups of different magnetic rings to inhibit harmonic waves of each phase, so that high-frequency interference generated by the inductor is attenuated locally, an outgoing line AO of the bridge port penetrates through a magnetic ring L5 and is filtered by a filter inductor L8, and then the outgoing line of the filter inductor L8 reversely penetrates through the magnetic ring L5;
leading an outgoing line BO of a bridge port to pass through a magnetic ring L6 and filter through a filter inductor L9, and then leading the outgoing line of the filter inductor L9 to reversely pass through a magnetic ring L6;
leading the outlet CO of the bridge port to pass through a magnetic ring L7 and filter through a filter inductor L10, and then leading the outlet of the filter inductor L10 to reversely pass through a magnetic ring L7;
and S3, a common-mode inductor L11, a differential-mode inductor L12 and a magnetic ring are matched on the alternating current output side of the inverter to suppress high-frequency interference of each frequency band.
5. The method as claimed in claim 4, wherein in step S1, one end of the positive bus DC + is connected to the inductor L3, and one end of the negative bus DC-is connected to the inductor L4 to form a filter loop, and the inductor L3 and the inductor L4 are used to suppress the differential mode interference.
6. The operating method of an EMI suppression circuit as claimed in claim 4, wherein in step S3, a three-phase common mode inductor L11 is used to suppress common mode interference on three-phase outgoing lines AO1, BO1 and CO1 of the inverter, the three-phase outgoing lines of the inverter are connected to one end of a common mode inductor L11, the three-phase output of the common mode inductor L11 is connected to the input terminals AO2, BO2 and CO2 of the differential mode inductor L12, and the output terminals AO3, BO3 and CO3 of the differential mode inductor L12 pass through the magnetic ring L13 and are connected to the three-phase outgoing lines A, B and 539C through the magnetic ring L14, the magnetic ring L15 and the magnetic ring L16.
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| EP3883109A1 (en) * | 2020-03-19 | 2021-09-22 | Hamilton Sundstrand Corporation | Power converter pwm |
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| CN112925288B (en) * | 2021-01-20 | 2021-11-02 | 金华职业技术学院 | Integrated electric control device of electric automobile |
| CN113629835A (en) * | 2021-07-16 | 2021-11-09 | 国网浙江省电力有限公司湖州供电公司 | High-power charging system of ship power battery |
| CN113824121B (en) * | 2021-11-23 | 2022-02-22 | 青岛鼎信通讯股份有限公司 | Structure applied to flexible direct-current comprehensive voltage regulating device for inhibiting common-mode interference |
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| CN201138785Y (en) * | 2007-11-29 | 2008-10-22 | 上海美多通信设备有限公司 | Wave filter circuit for switch power supply |
| CN201385176Y (en) * | 2009-03-27 | 2010-01-20 | 成都华远电器设备有限公司 | Output rectification protection circuit of novel inverter welding machine |
| CN202309512U (en) * | 2011-10-25 | 2012-07-04 | 科比传动技术（上海）有限公司 | Electromagnetic interference restraining structure of frequency converter |
| CN203278641U (en) * | 2013-04-08 | 2013-11-06 | 许继集团有限公司 | Photovoltaic grid-connected inverter based on EMI filter |
| CN204316327U (en) * | 2014-12-26 | 2015-05-06 | 北车风电有限公司 | A kind of electromagnetic interface filter for dual feedback wind power generation system |
| CN104638891A (en) * | 2015-02-15 | 2015-05-20 | 无锡上能新能源有限公司 | Common-mode voltage suppression system for photovoltaic grid-connected inverter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3883109A1 (en) * | 2020-03-19 | 2021-09-22 | Hamilton Sundstrand Corporation | Power converter pwm |
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