CN202261012U - EMI (Electro-Magnetic Interference) filter for industrial frequency converter - Google Patents
EMI (Electro-Magnetic Interference) filter for industrial frequency converter Download PDFInfo
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- CN202261012U CN202261012U CN2011203463897U CN201120346389U CN202261012U CN 202261012 U CN202261012 U CN 202261012U CN 2011203463897 U CN2011203463897 U CN 2011203463897U CN 201120346389 U CN201120346389 U CN 201120346389U CN 202261012 U CN202261012 U CN 202261012U
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- emi
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- industrial frequency
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Abstract
The utility model discloses an EMI (Electro-Magnetic Interference) filter for an industrial frequency converter, which is characterized by comprising a capacitor group and an inductor group, wherein the capacitor group comprises three first capacitors and the three first capacitors are parallel connected with a phase A, a phase B and a phase C which are in a four-wire and three-phase type; and the inductor group comprises four inductors and the four inductors are serially connected with the phase A, the phase B, the phase C and a wire N which are in the four-wire and three-phase type. With regard to that high-frequency current has high impedance, capacitor-inductor combination adopted by the EMI filter in the utility model can effectively inhibit influences on equipment by high frequency interference in an alternative-current power grid and can inhibit the equipment at the same time, particularly the interference on the alternative-current power grid through a high-frequency switch power supply, thereby assuring the operation safety and the reliability of the power grid which the industrial frequency converter is in. Through a correctly-designed filter, the EMI emission strength of the system can be reduced to be less than EMC (Electro Magnetic Compatibility) standard limit value, so as to play an important role in realizing electromagnetic compatibility and power grid environment purification of electric equipment and system.
Description
Technical field
The utility model relates to a kind of industrial frequency transformer and uses electromagnetic interface filter.
Background technology
During industrial frequency transformer is used at the scene; Often run into the interference problem of frequency converter: because a lot of computer control boards of industry spot do not meet the EMC international standard to computer control board; So after adopting frequency converter, the conduction of generation and radiated interference often cause the control system operation irregularity.
For example, the modern electrical machine drive system, a typical industrial frequency transformer develops into the power inverter drive controlling that adopts pulse modulation technology (PWM), i.e. PWM motor driven systems by the original simple direct drive controlling of power frequency supply.Though this systematic function has obtained significantly improving, owing to the reason of PWM pulse-width modulation strategy will inevitably make system's generation common mode EMI.
To this, electromagnetic interface filter is installed in input additional to frequency converter, can effectively suppress the conducted interference of frequency converter to electrical network.But at present a lot of electromagnetic interface filter parameter designing are unreasonable, not only increased unnecessary volume and cost, and can produce negative influence to THD value and electrical safety.
The utility model content
The purpose of the utility model is in order to overcome deficiency of the prior art, to provide a kind of effective inhibition frequency converter that the industrial frequency transformer of the conducted interference of electrical network is used electromagnetic interface filter.
For realizing above purpose, the utility model is realized through following technical scheme:
Industrial frequency transformer is used electromagnetic interface filter, it is characterized in that, comprising:
Capacitance group, said capacitance group comprise three first electric capacity, and A phase, B that three first electric capacity is connected in parallel on four-wire three-phase system reach C mutually and go up mutually;
Inductive bank, said inductive bank comprise four inductance, and four inductance are connected on A phase, B phase, C phase and the N line of four-wire three-phase system.
Preferably, also comprise resistor group, said resistor group comprises three resistance, and A phase, B that three resistance is connected in parallel on four-wire three-phase system go up with C mutually mutually.
Preferably, also comprise one second electric capacity, said second electric capacity is arranged between N line and the ground wire.
Preferably, also comprise three the 3rd electric capacity, A phase, B that said the 3rd electric capacity is connected in parallel on four-wire three-phase system go up with C mutually mutually.The 3rd electric capacity can play the effect that absorbs DM EMI between phase line and zero line.
The utility model can be used for the frequency converter equipment of present all working in system voltage is the four-wire three-phase system industrial electrical network of 400VAC.
The capacitor and inductor combination that the electromagnetic interface filter that designs in the utility model adopts; Present high impedance for high-frequency current; Can effectively suppress High-frequency Interference in the AC network to the influence of equipment; Simultaneously again can suppression equipment, especially high frequency switch power to the interference of AC network, guarantee the safe and reliable of industrial frequency transformer place operation of power networks.Filter through correct design can make system's EMI emissive porwer be reduced to below the EMC standard limited value, and these realize that to electric equipment and system electromagnetic compatibility, purification power grid environment have played important function.
Description of drawings
Fig. 1 is the utility model circuit theory diagrams.
Embodiment
Below in conjunction with accompanying drawing the utility model is carried out detailed description:
As shown in Figure 1, industrial frequency transformer is used electromagnetic interface filter, comprising:
Capacitance group, capacitance group comprise first capacitor C
1, first capacitor C
2With first capacitor C
3, first capacitor C
1, first capacitor C
2With first capacitor C
3Be connected in parallel on respectively between A line, B line and the C line and N line of four-wire three-phase system, promptly be connected in parallel on A phase, B respectively and go up mutually with C mutually.
Inductive bank, said inductive bank comprises inductance L
1, inductance L
2, inductance L
3And inductance L
4Inductance L
1, inductance L
2, inductance L
3And inductance L
4Be arranged on A phase, B phase, C phase and the N line, and inductance L
1, inductance L
2, inductance L
3And inductance L
4Series connection.
Resistor group comprises resistance R
1, resistance R
2, resistance R
3, resistance R
1, resistance R
2, resistance R
3Be connected in parallel on respectively between A line, B line and the C line and N line of four-wire three-phase system, promptly be connected in parallel on A phase, B respectively and go up mutually with C mutually.
Second capacitor C
4Be arranged between N line and the ground wire.
The 3rd capacitor C
5, the 3rd capacitor C
6With the 3rd capacitor C
7Be connected in parallel on respectively between A line, B line and the C line and N line of four-wire three-phase system, promptly be connected in parallel on A phase, B respectively and go up mutually with C mutually.
Embodiment in the utility model only is used for the utility model is described, and does not constitute the restriction to the claim scope, and other substituting of being equal in fact that those skilled in that art can expect are all in the utility model protection range.
Claims (4)
1. industrial frequency transformer is used electromagnetic interface filter, it is characterized in that, comprising:
Capacitance group, said capacitance group comprise three first electric capacity, and A phase, B that three first electric capacity is connected in parallel on four-wire three-phase system reach C mutually and go up mutually;
Inductive bank, said inductive bank comprise four inductance, and four inductance are connected on A phase, B phase, C phase and the N line of four-wire three-phase system.
2. industrial frequency transformer according to claim 1 is used electromagnetic interface filter, it is characterized in that, also comprises resistor group, and said resistor group comprises three resistance, and A phase, B that three resistance is connected in parallel on four-wire three-phase system go up with C mutually mutually.
3. industrial frequency transformer according to claim 1 is used electromagnetic interface filter, it is characterized in that, also comprises one second electric capacity, and said second electric capacity is arranged between N line and the ground wire.
4. industrial frequency transformer according to claim 1 is used electromagnetic interface filter, it is characterized in that, also comprises three the 3rd electric capacity, and A phase, B that said the 3rd electric capacity is connected in parallel on four-wire three-phase system go up with C mutually mutually.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203463897U CN202261012U (en) | 2011-09-15 | 2011-09-15 | EMI (Electro-Magnetic Interference) filter for industrial frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203463897U CN202261012U (en) | 2011-09-15 | 2011-09-15 | EMI (Electro-Magnetic Interference) filter for industrial frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202261012U true CN202261012U (en) | 2012-05-30 |
Family
ID=46122194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203463897U Expired - Lifetime CN202261012U (en) | 2011-09-15 | 2011-09-15 | EMI (Electro-Magnetic Interference) filter for industrial frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202261012U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151908A (en) * | 2013-01-08 | 2013-06-12 | 科比传动技术（上海）有限公司 | Filtering unit and frequency converter |
| CN103401588A (en) * | 2013-08-02 | 2013-11-20 | 成都博高科技有限责任公司 | Low-voltage power line carrier three-phase coupling circuit |
-
2011
- 2011-09-15 CN CN2011203463897U patent/CN202261012U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151908A (en) * | 2013-01-08 | 2013-06-12 | 科比传动技术（上海）有限公司 | Filtering unit and frequency converter |
| CN103401588A (en) * | 2013-08-02 | 2013-11-20 | 成都博高科技有限责任公司 | Low-voltage power line carrier three-phase coupling circuit |
| CN103401588B (en) * | 2013-08-02 | 2015-06-10 | 成都博高科技有限责任公司 | Low-voltage power line carrier three-phase coupling circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHANGHAI CHINA ROLLAY ELECTRIC (SHANGHAI) CO., LTD Free format text: FORMER NAME: SHANGHAI CHINA ELECTRONIC ROLLAY DIGITAL TECHNOLOGY (SHANGHAI) CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: Fengxian District Jinhui Town money highway 201407 Shanghai City No. 411 Building 2 room 115 Patentee after: China Rollay Electric (Shanghai) Co., Ltd. Address before: Fengxian District Jinhui Town money highway 201407 Shanghai City No. 411 Building 2 room 115 Patentee before: China Rollary Digital Technology (Shanghai) Co., Ltd. |
|
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Fengxian District Jinhui Town money highway 201407 Shanghai City No. 411 Building 2 room 115 Patentee after: Shanghai ROLLAY electrical Limited by Share Ltd Address before: Fengxian District Jinhui Town money highway 201407 Shanghai City No. 411 Building 2 room 115 Patentee before: China Rollay Electric (Shanghai) Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120530 |