CN101272086B - EMC equipment - Google Patents
EMC equipment Download PDFInfo
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- CN101272086B CN101272086B CN2007100897873A CN200710089787A CN101272086B CN 101272086 B CN101272086 B CN 101272086B CN 2007100897873 A CN2007100897873 A CN 2007100897873A CN 200710089787 A CN200710089787 A CN 200710089787A CN 101272086 B CN101272086 B CN 101272086B
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- 230000000694 effects Effects 0.000 abstract description 4
- 239000003990 capacitor Substances 0.000 abstract 5
- 230000003071 parasitic effect Effects 0.000 description 5
- 230000006698 induction Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000036039 immunity Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
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Abstract
The invention discloses EMC equipment which comprises a device susceptible to high-frequency interference, wherein a capacitor is connected in parallel to the device susceptible to high-frequency interference. The capacitor is connected in parallel with the device of the EMC equipment which is easy to be interfered by high frequency, the effect of the capacitor is weak at low frequency, the capacitive reactance of the capacitor is reduced at high frequency, and the high frequency interference picked up by the device which is easy to be interfered by high frequency is short-circuited by the capacitor and cannot be continuously transmitted, so that the high frequency interference is reduced, and the performance of the EMC equipment is improved.
Description
Technical field
The present invention relates to electromagnetic compatibility (Electro Magnetic Compatibility is called for short EMC), relate in particular to a kind of EMC equipment.
Background technology
Electromagnetic compatibility (EMC) is meant that the equipment operation that meets the requirements does not produce the ability of intolerable electromagnetic interference to any equipment in its environment in its electromagnetic environment.Therefore, EMC comprises the requirement of two aspects: the equipment that is meant on the one hand can not surpass certain limit value to the electromagnetic interference that the place environment produces in normal course of operation; The equipment that is meant on the other hand has to a certain degree immunity to interference, i.e. electromagnetic susceptibility to the electromagnetic interference that exists in the environment of place.Existing EMC equipment is easy to suffer space or High-frequency Interference along the line, influences the performance of equipment.
Switching Power Supply is a kind of EMC equipment that needs better EMC performance, and along with the continuous miniaturization of Switching Power Supply, power density improve constantly, LLC resonance DC/direct current (DC/DC) converter arises at the historic moment.The characteristics of LLC controlled resonant converter are: main magnetic element air gap is big especially, and leakage field is strong especially, and leakage field not only has low-frequency component, and radio-frequency component is also arranged.Even suitably shielded, the filter of Switching Power Supply still is in the stronger space radiation environment, picks up spatial interference easily, influences the performance of LLC controlled resonant converter.
Summary of the invention
The present invention is exactly in order to overcome above deficiency, to have proposed a kind of EMC equipment, can reducing High-frequency Interference.
Technical problem of the present invention is solved by following technical scheme: a kind of EMC equipment, comprise the device that is subject to High-frequency Interference, and be parallel with electric capacity on the described device that is subject to High-frequency Interference; The span of the capacity of described electric capacity be 10pf extremely
Wherein, f is the switching frequency of Switching Power Supply, and L is the sensibility reciprocal of the filter inductance DIFF_L of the first order.
Technical problem of the present invention is further solved by following technical scheme:
Described EMC equipment is Switching Power Supply, described Switching Power Supply comprises AC power, alternating current filter, circuit of power factor correction, DC/DC converter and the DC filter that links to each other successively, and the described device that is subject to High-frequency Interference is the filter inductance of described alternating current filter or described DC filter.
Described DC/DC converter is the LLC topology.
Described filter inductance is the first order inductance of described alternating current filter.
The beneficial effect that the present invention is compared with the prior art is: the present invention is parallel with electric capacity on the device that is subject to High-frequency Interference of EMC equipment, the effect of electric capacity is faint when low frequency, when high frequency, the capacitive reactance of electric capacity diminishes, the High-frequency Interference that device picked up that is subject to High-frequency Interference is fallen by capacitance short-circuit, can't continue to propagate, thereby reduce High-frequency Interference, promote the performance of EMC equipment.
The present invention has further eliminated existing technology prejudice, electric capacity in parallel on the inductance of the alternating current filter of Switching Power Supply, thus eliminate the influence of spatial high-frequency to Switching Power Supply.The present invention is shunt capacitance on the first order filter inductance of alternating current filter especially, eliminate the easiest interference that device brought that picks up High-frequency Interference, and the secondary filter inductance that passes through alternating current filter is eliminated the noise of propagating along the line, thereby reduce various interference, make the performance of Switching Power Supply of the present invention more excellent.
Description of drawings
Fig. 1 is the structural representation of Switching Power Supply of the present invention;
Fig. 2 is the structural representation of the alternating current filter of Switching Power Supply of the present invention;
Fig. 3 a, 3b, 3c, 3d are the structural representations of the DC/DC converter of Switching Power Supply of the present invention;
Fig. 4 a, 4b are the effect comparison schematic diagrames before and after of the present invention the use.
Embodiment
Principle of the present invention is as follows: EMC equipment generally all comprises a device that is subject to High-frequency Interference, and the present invention is subject to shunt capacitance on the device of High-frequency Interference at this.The described device that is subject to High-frequency Interference is an inductance.
Switching Power Supply as shown in Figure 1 comprises AC power 1, alternating current filter 2, circuit of power factor correction (PFC) 3, DC/DC converter 4 and DC filter 5.Described alternating current filter 2 is connected between AC power 1 and the circuit of power factor correction 3, and described DC/DC converter 4 is connected between circuit of power factor correction 3 and the DC filter 5.Shown in Fig. 2 a, described alternating current filter 2 is used for the interference of filtering DC/DC converter 4 by PFC3 output, and described alternating current filter 2 is divided into multistage, and wherein the filter inductance DIFF_L of the first order easily picks up the spatial high-frequency interference.Shown in Fig. 2 b, the present invention is parallel with electric capacity at the filter inductance DIFF_L of the described first order, the range of capacity of described electric capacity be 10pf extremely
Wherein, f is the switching frequency of Switching Power Supply, and L is the sensibility reciprocal of the filter inductance DIFF_L of the first order.Obviously, also can be on other inductance of alternating current filter 2 shunt capacitance, also can be on the inductance of described DC filter 5 shunt capacitance.
Described DC/DC converter is preferably LLC topology and its several versions shown in Fig. 3 a, 3b, 3c, 3d.Obviously, even be not the LLC topology,, all be suitable for being subject to be parallel with electric capacity on the device of High-frequency Interference as long as inductance suffers the High-frequency Interference in space.
In the more intense occasion of spatial high-frequency (such as 20MHZ) radiated interference, the filter inductance of alternating current filter 2, particularly first order inductance easily picks up this interference, and AC power 1 is brought adverse influence.And the filter inductance of alternating current filter 2 (particularly first order inductance) is general main for low frequency (such as 200KHZ) design, and therefore an electric capacity in parallel (such as 0.5nF.) just can be with High-frequency Interference short circuit filtering on this filter inductance.
With the little electric capacity of 10uH differential mode inductance 0.5nF high frequency in parallel is example, and the capacitive reactance of electric capacity is 1.59E+03OHM when low frequency 200KHZ, and the induction reactance of inductance is 1.26E+01, and the capacitive reactance of electric capacity is much larger than the induction reactance of inductance, and the effect of electric capacity is faint.When high frequency 20MHZ, the capacitive reactance of electric capacity is 1.59E+01OHM, and the induction reactance of inductance is 1.26E+03, and the capacitive reactance of electric capacity is much smaller than the induction reactance of inductance, and the High-frequency Interference that inductance picked up is fallen by capacitance short-circuit, can't continue to propagate.
In the 134th page of " the electro permanent magnetic design and the test of Switching Power Supply " book, mention the actual electrical sensor owing to have parasitic capacitance and series resistance, therefore can produce a self-resonant frequency, this parasitic capacitance is in parallel with inductor.In order to increase the resonance frequency of inductor, should reduce parasitic capacitance, thereby make the service behaviour of inductance good more.At the 135th page of this book, also to mention especially to reducing parasitic capacitance, inductor has adopted the way of segmentation coiling.Also mentioning inductor 219 pages of " the EMC technology (third edition) in the product design " book has resonance frequency, and impedance begins to descend after surpassing.Use the filter circuit of common mode choke can its performance be suffered restraints owing to the influence of choke self-capacitance usually.All be to avoid producing the parasitic capacitance in parallel in existing EMC equipment as far as possible, improve the performance of equipment with inductor.
The present invention has exactly overcome this prejudice, and electric capacity in parallel on inductor makes the spatial high-frequency that picks up on the inductor disturb to be fallen by capacitance short-circuit.Further illustrate the beneficial effect that the present invention brings from the experimental result shown in Fig. 4 a, the 4b by experiment.From Fig. 4 a as can be seen, the interference volume at high frequency (20MHZ) when not setting up electric capacity is 60dB μ V, from Fig. 4 b as can be seen, reduces to about 45dB μ V at the interference volume of high frequency (20MHZ) after setting up electric capacity.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (4)
1. EMC equipment, described EMC equipment is Switching Power Supply, comprises the device of the High-frequency Interference that is subject to the space, it is characterized in that:
The described device that is subject to the High-frequency Interference in space is an inductance, is parallel with electric capacity on the described inductance; The span of the capacity of described electric capacity be 10pf extremely
Wherein, f is the switching frequency of Switching Power Supply, and L is the sensibility reciprocal of described inductance.
2. EMC equipment according to claim 1 is characterized in that:
Described Switching Power Supply comprises AC power, alternating current filter, circuit of power factor correction, DC/DC converter and the DC filter that links to each other successively, and the described device that is subject to High-frequency Interference is the filter inductance of described alternating current filter or described DC filter.
3. EMC equipment according to claim 2 is characterized in that:
Described DC/DC converter is the LLC topology.
4. according to claim 2 or 3 described EMC equipment, it is characterized in that:
Described filter inductance is the first order inductance of described alternating current filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100897873A CN101272086B (en) | 2007-03-19 | 2007-03-19 | EMC equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100897873A CN101272086B (en) | 2007-03-19 | 2007-03-19 | EMC equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101272086A CN101272086A (en) | 2008-09-24 |
| CN101272086B true CN101272086B (en) | 2010-12-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007100897873A Active CN101272086B (en) | 2007-03-19 | 2007-03-19 | EMC equipment |
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| CN (1) | CN101272086B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101834540A (en) * | 2010-05-24 | 2010-09-15 | 佛山市顺德区正吉电子科技有限公司 | Switch power supply of electric motor saver |
| CN104485810A (en) * | 2014-12-08 | 2015-04-01 | 厦门银江智慧城市技术有限公司 | Power supply filtering circuit |
| EP3193437B1 (en) * | 2016-01-14 | 2018-09-19 | Aircontech GmbH | Step-up converter |
| DE102016103447A1 (en) | 2016-02-26 | 2017-08-31 | Epcos Ag | Filter component and use of a filter device |
| CN112019038A (en) * | 2019-05-29 | 2020-12-01 | 湖南中车时代电动汽车股份有限公司 | EMC filter equipment |
| CN111092603A (en) * | 2019-11-28 | 2020-05-01 | 四川泛华航空仪表电器有限公司 | Anti-conduction interference filter circuit of aviation high-temperature ignition device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1797912A (en) * | 2004-12-14 | 2006-07-05 | 国际整流器公司 | Emi noise-reduction circuit and method for no-bridge power factor correction circuit |
-
2007
- 2007-03-19 CN CN2007100897873A patent/CN101272086B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1797912A (en) * | 2004-12-14 | 2006-07-05 | 国际整流器公司 | Emi noise-reduction circuit and method for no-bridge power factor correction circuit |
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| CN101272086A (en) | 2008-09-24 |
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Effective date of registration: 20110323 Address after: The United States of Ohio city F Lorain Street No. 1122 Patentee after: Emerson Network Power Co., Ltd. Address before: Sweden Stockholm Taylor's grid Street No. 1 Patentee before: Emerson Network Power Co., Ltd. |
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Address after: No. 1510, Kansas Avenue, lureen, Ohio, USA Patentee after: Walteff energy systems company Address before: The United States of Ohio city F Lorain Street No. 1122 Patentee before: Emerson Network Power Co., Ltd. |
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Effective date of registration: 20201116 Address after: Columbo Road, Ohio, Dearborn 1050 Patentee after: Dimension Corp. Address before: 1510 Kansas Avenue, Loren, Ohio, USA Patentee before: Emerson Energy Systems, AB |
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