CN104797064A - Emc circuit - Google Patents
Emc circuit Download PDFInfo
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- CN104797064A CN104797064A CN201510136000.9A CN201510136000A CN104797064A CN 104797064 A CN104797064 A CN 104797064A CN 201510136000 A CN201510136000 A CN 201510136000A CN 104797064 A CN104797064 A CN 104797064A
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- common mode
- capacitance
- inductance
- circuit
- differential
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The invention relates to an EMC circuit which comprises a differential mold filtering circuit and a common mold filtering circuit which are connected in sequence. The common mold filtering circuit comprises a common mold capacitance C1 and a common mold capacitance C2 which are connected in series, wherein the contacts of the common mold capacitance C1 and the common mold capacitance C2 are connected with a grounding wire, and an inductance L is arranged on the grounding wire. The EMC circuit can effectively restrain the influence of the triangular wave in the input current on the conducted interference, not only can meet the requirements for the input current harmonic content limit value of the electronic ballast which is larger than 25W by the national standard GBl7625 1998, but also can meet the requirements for the EMC by the national standard GBl7743 1999, and can meet the requirements for the EMC by the national standard GBl7743 1999 in the middle-frequency band and the high-frequency band.
Description
Technical field
The present invention relates to a kind of electric ballast, specifically, relate to a kind of EMC circuit for APFC in electric ballast, belong to electric ballast technical field.
Background technology
Input current in active power factor circuit is the triangular wave of a string frequency change, and its frequency spectrum is very abundant, and input current intermediate cam ripple be suppressed the impact of conducted interference, must adopt complicated passive filter circuit.Traditional passive filter circuit as shown in Figure 1, passive filter circuit comprises differential mode filter circuit and common mode filtering circuit, differential mode filter circuit comprises differential mode inductance Ld, differential mode capacitor Cdl and differential mode capacitor Cd2, common mode filtering circuit comprises common mode inductance LCl, common mode capacitance Cl and common mode capacitance C2, differential mode inductance Ld and differential mode capacitor Cdl is connected on the two ends of power supply, common mode inductance LCl and differential mode capacitor Cd2 is in parallel with differential mode capacitor Cdl, in parallel with differential mode capacitor Cd2 after common mode capacitance Cl and common mode capacitance C2 series connection, the direct ground connection of contact of common mode capacitance Cl and common mode capacitance C2.
In order to illustrate that in filter circuit, differential mode filter circuit and common mode filtering circuit are to the effect suppressing conducted interference, frequency range 9kHZ to the 30MKZ that one electric ballast EMC tests is divided into basic, normal, high three frequency ranges, i.e. about 9-150kHZ, about 150kHZ-2.0MKZ, 2.0-30MKZ tri-sections, for 9kHz-150kHz low-frequency range, adopt differential mode filter circuit more effective; And adopt common mode filtering circuit more effective to the middle and high frequency range of 150kHz-30MKZ, sometimes use one-level common mode filtering circuit filter effect good not, also to adopt two-stage common mode filtering circuit, as shown in Figure 2, above this traditional filter circuit is difficult to accomplish to meet at Mid Frequency and high band the requirement tested EMC simultaneously.In the selection of parameter, often meet the requirement of Mid Frequency, the requirement of high band cannot be met, or conversely, meet the requirement of high band, the requirement of Mid Frequency cannot be met, be difficult to the requirement taking into account two aspects.
Summary of the invention
The problem to be solved in the present invention is for above problem, provides a kind of EMC circuit that simultaneously can meet EMC test request at Mid Frequency and high band.
For overcoming the above problems, the technical solution adopted in the present invention is: EMC circuit, comprise the differential mode filter circuit and common mode filtering circuit that connect successively, described common mode filtering circuit comprises common mode capacitance Cl and the common mode capacitance C2 of series connection, the contact of common mode capacitance Cl and common mode capacitance C2 is connected with earth connection, it is characterized in that: described earth connection is provided with inductance L.
The further improvement of technique scheme:
Described differential mode filter circuit comprises differential mode inductance Ld, differential mode capacitor Cdl and differential mode capacitor Cd2, common mode filtering circuit also comprises common mode inductance LCl, differential mode inductance Ld and differential mode capacitor Cdl is connected on the two ends of power supply, common mode inductance LCl and differential mode capacitor Cd2 is in parallel with differential mode capacitor Cdl, in parallel with differential mode capacitor Cd2 after common mode capacitance Cl and common mode capacitance C2 series connection.
Described common mode inductance LCl is in series with common mode inductance LC2.
The present invention takes above technical scheme, have the following advantages: after adopting this programme, effectively suppress input current intermediate cam ripple on the impact of conducted interference, both met to the requirement of more than >25W electric ballast about Harmonics of Input prohibitive content in standard GB/T l7625.1-1998, the requirement of standard GB/T l7743-1999 about EMC can have been met again.Requirement about EMC in GBl7743-1999 national standard can be met at Mid Frequency and high band simultaneously.
Accompanying drawing explanation
Accompanying drawing l is the circuit diagram of a kind of scheme of EMC circuit in prior art;
Accompanying drawing 2 is the circuit diagram of the another kind of scheme of EMC circuit in prior art;
Accompanying drawing 3 is the circuit diagram of EMC circuit in embodiment of the present invention l;
Accompanying drawing 4 is the circuit diagram of EMC circuit in the embodiment of the present invention 2.
Embodiment
EXAMPLE l, accompanying drawing 3 is the circuit diagram of EMC circuit, comprise the differential mode filter circuit and common mode filtering circuit that connect successively, common mode filtering circuit is electrically connected with APFC, differential mode filter circuit comprises differential mode inductance Ld, differential mode capacitor Cdl and differential mode capacitor Cd2, common mode filtering circuit comprises common mode inductance LCl, common mode capacitance Cl and common mode capacitance C2, differential mode inductance Ld and differential mode capacitor Cdl is connected on the two ends of power supply, common mode inductance LCl and differential mode capacitor Cd2 is in parallel with differential mode capacitor Cdl, in parallel with differential mode capacitor Cd2 after common mode capacitance Cl and common mode capacitance C2 series connection, the contact of common mode capacitance Cl and common mode capacitance C2 is through inductance L ground connection.
The computational methods of inductance L are as follows:
At Mid Frequency, get f=300kHZ, get common mode capacitance Cl, common mode capacitance C2 is 2200pF, its capacitive reactance is:
，
For making common mode capacitance Cl, common mode capacitance C2 be short circuit over the ground, can make inductance L induction reactance be common mode capacitance
The half of the capacitive reactance of Cl, common mode capacitance C2, then
，
，
Can calculate thus: L=64 u H,
Now the induction reactance of common mode capacitance Cl, common mode capacitance C2 and inductance L is cancelled out each other, and can be considered as short circuit over the ground, ensures common mode capacitance Cl, common mode capacitance C2 shorted to earth;
At high band, get f=10MHZ and recall, one spike appears near 10MHZ, then the induction reactance of inductance L is:
，
Visible, much larger than the capacitive reactance of common mode capacitance Cl, common mode capacitance C2 of the induction reactance of inductance L, the capacitive reactance of common mode capacitance C2 is that 7.2 Ω, common mode capacitance Cl, common mode capacitance C2 can be considered as open circuit over the ground.Thus meet Mid Frequency and high band to the requirement of common mode capacitance Cl, common mode capacitance C2.
The value of inductance L should between 47 u H ~ l00u H.
Embodiment 2, accompanying drawing 4 is the circuit diagram of EMC circuit, comprise the differential mode filter circuit and common mode filtering circuit that connect successively, common mode filtering circuit is electrically connected with APFC, differential mode filter circuit comprises differential mode inductance Ld, differential mode capacitor Cdl and differential mode capacitor Cd2, common mode filtering circuit comprises common mode inductance LCl, common mode inductance LC2, common mode capacitance Cl and common mode capacitance C2, differential mode inductance Ld and differential mode capacitor Cdl is connected on the two ends of power supply, differential mode capacitor Cd2 is in parallel with differential mode capacitor Cdl, common mode inductance LCl, common mode inductance LC2 is in parallel with differential mode capacitor Cdl after connecting, in parallel with differential mode capacitor Cd2 after common mode capacitance Cl and common mode capacitance C2 series connection, the contact of common mode capacitance Cl and common mode capacitance C2 is through inductance L ground connection.
The computational methods of inductance L are identical with the computational methods of EXAMPLE l.
Claims (3)
1.EMC circuit, comprise the differential mode filter circuit and common mode filtering circuit that connect successively, described common mode filtering circuit comprises common mode capacitance Cl and the common mode capacitance C2 of series connection, and the contact of common mode capacitance Cl and common mode capacitance C2 is connected with earth connection, it is characterized in that: described earth connection is provided with inductance L.
2. the EMC circuit as described in claim l, it is characterized in that: described differential mode filter circuit comprises differential mode inductance Ld, differential mode capacitor Cdl and differential mode capacitor Cd2, common mode filtering circuit also comprises common mode inductance LCl, differential mode inductance Ld and differential mode capacitor Cdl is connected on the two ends of power supply, common mode inductance LCl and differential mode capacitor Cd2 is in parallel with differential mode capacitor Cdl, in parallel with differential mode capacitor Cd2 after common mode capacitance Cl and common mode capacitance C2 series connection.
3. EMC circuit as claimed in claim 2, is characterized in that: described common mode inductance LCl is in series with common mode inductance LC2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510136000.9A CN104797064A (en) | 2015-03-26 | 2015-03-26 | Emc circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510136000.9A CN104797064A (en) | 2015-03-26 | 2015-03-26 | Emc circuit |
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| Publication Number | Publication Date |
|---|---|
| CN104797064A true CN104797064A (en) | 2015-07-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510136000.9A Pending CN104797064A (en) | 2015-03-26 | 2015-03-26 | Emc circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107204704A (en) * | 2016-03-18 | 2017-09-26 | 广东美的生活电器制造有限公司 | Mixer and the electromagnetic interference suppression circuit for mixer |
| CN108051671A (en) * | 2017-12-08 | 2018-05-18 | 中国核动力研究设计院 | A kind of wide frequency ranges inhibit the device and method of power cord conducted emission |
| WO2022017049A1 (en) * | 2020-07-22 | 2022-01-27 | 京东方科技集团股份有限公司 | Anti-power environment suppression circuit, touch screen, and touch display device |
-
2015
- 2015-03-26 CN CN201510136000.9A patent/CN104797064A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107204704A (en) * | 2016-03-18 | 2017-09-26 | 广东美的生活电器制造有限公司 | Mixer and the electromagnetic interference suppression circuit for mixer |
| CN107204704B (en) * | 2016-03-18 | 2020-12-22 | 广东美的生活电器制造有限公司 | Mixer and be used for electromagnetic interference suppression circuit of mixer |
| CN108051671A (en) * | 2017-12-08 | 2018-05-18 | 中国核动力研究设计院 | A kind of wide frequency ranges inhibit the device and method of power cord conducted emission |
| WO2022017049A1 (en) * | 2020-07-22 | 2022-01-27 | 京东方科技集团股份有限公司 | Anti-power environment suppression circuit, touch screen, and touch display device |
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Legal Events
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| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150722 |
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| WD01 | Invention patent application deemed withdrawn after publication |