CN202009367U - High frequency conduction wave filter - Google Patents
High frequency conduction wave filter Download PDFInfo
- Publication number
- CN202009367U CN202009367U CN2010206448803U CN201020644880U CN202009367U CN 202009367 U CN202009367 U CN 202009367U CN 2010206448803 U CN2010206448803 U CN 2010206448803U CN 201020644880 U CN201020644880 U CN 201020644880U CN 202009367 U CN202009367 U CN 202009367U
- Authority
- CN
- China
- Prior art keywords
- high frequency
- signal
- frequency
- wave filter
- disturbance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Filters And Equalizers (AREA)
Abstract
The utility model discloses a high frequency conduction wave filter which has absorbing and filtering functions for conducting high frequency electromagnetic disturbance and is applied to electronic and electric equipment that produces high frequency disturbance. A metal lead wire is specially designed to form a radio frequency emitting conductor, and high frequency absorbing materials are coated on the emitting conductor to form into a high frequency resistor which has a radio frequency disturbance absorbing function; an earthed filter capacitor is connected with a signal input end of the high frequency resistor to realize the high frequency wave filtering function; and the high frequency resistor and the filter capacitor form a high frequency conduction wave filter together. In order to prevent a high frequency disturbance signal from leaking, a metal shielding shell is externally sleeved on the high frequency conduction wave filter; and in order to prevent possible leakage of electricity, a layer of insulation materials can be added between the high frequency conduction wave filter and the metal shielding shell. The high frequency conduction wave filter has the following characteristics: (1) the high frequency disturbance signal can be inhibited, and high frequency disturbance energy can be released simultaneously; (2) the radio frequency emitting conductor adopts a plane structure, so that the distributed capacitance can be reduced to the utmost extent, and the phenomenon of crosstalk can be reduced; (3) the radio frequency emitting conductor adopts an open loop structure, so that distributed inductance can be reduced to the utmost extent, and possibility of resonance can be reduced; (4) the metal shielding shell is adopted, so that the leakage problem of the internal radio frequency signal is eliminated, and the effect of external disturbance signal on the transmission signal is avoided simultaneously; and (5) the input lead wire and the output lead wire adopt shielding wires, so that the high frequency disturbance signal can be prevented from directly coupling from the lead wire at the input end to the lead wire at the output end.
Description
Affiliated technical field
This high frequency conduction filter is that the alternating-current resistance that utilizes the high frequency absorption material to form suppresses and the high-frequency electromagnetic that filters in the lead is harassed, and uses the high-frequency filter capacitor of ground connection simultaneously, high frequency is harassed the signal bypass go into ground.In the electronic electric equipment circuit, realize suppressing the function of conduction high-frequency electromagnetic harassing and wrecking, belong to the electromagnetic compatibility technology field.
Background technology
When high-frequency electromagnetic harassing and wrecking signal in transmission line when lead transmit, part signal will be along conductive line surfaces to space radiation, the generation radio frequency
[1]Harassing and wrecking.The relevant world and national standard require high frequency to harass the limit value that should not surpass regulation, and many type switching power electronic electric equipments can not satisfy the requirement of standard.
At present, electromagnetic compatibility filter circuit commonly used is made of inductance capacitance as shown in Figure 1 in electronic electric equipment.Two capacitor C y are used to filter high frequency harassing and wrecking signal, and inductance L is used to stop low frequency common mode harassing and wrecking signal, and capacitor C x is used to filter the low frequency difference mode signal.Such filter circuit can do effective filtration low frequency disturbance signal and a spot of high frequency harassing and wrecking signal.For high frequency harassing and wrecking signal, there are the following problems for it:
(1) capacitor C y can not be excessive, otherwise cause leakage current excessive; When high frequency harassing and wrecking signal was very strong, two Cy electric capacity can not the capacity bypass.
(2) along with the rising of frequency, the magnetic permeability of inductance L magnetic core reduces, and inductance value reduces, and distributed capacitance increases, and the inductance L capacitive is main, is equivalent to short circuit for high frequency harassing and wrecking signal.
(3) capacitor C x is equivalent to short circuit to high frequency harassing and wrecking signal.
Therefore, for high-intensity high frequency harassing and wrecking signal, electromagnetic compatibility filter commonly used does not almost have filter effect, and a large amount of high frequency harassing and wrecking signals enter power supply circuits, cause the electronic electric equipment electromagnetic compatibility not meet the requirement of the relevant world/domestic standard.For this reason, specialized designs of the present invention high frequency conduction filter, utilize the high frequency absorption material that most of high frequency harassing and wrecking signal losses is fallen; Utilize the alternating-current resistance characteristic of high frequency absorption material, high frequency is harassed signal stop, make it not enter power supply circuits at device interior; Utilize filter capacitor will be stopped in the bypass of the interior high frequency harassing and wrecking of equipment signal and go into ground.
Summary of the invention
Plain conductor is designed to the radio-frequency transmissions conductor, and the high frequency absorption material is coated on the emission conductor, makes the alternating-current resistance with radio environment absorption function; Connect the high-frequency filter capacitor of ground connection at the signal input part of alternating-current resistance, realize the High frequency filter function; Alternating-current resistance and high-frequency filter capacitor constitute high frequency conduction filter jointly.
For preventing high frequency harassing and wrecking signal leakage, use the metallic shield shell that high frequency is conducted filter and encase; Be the electric leakage that prevents to occur, can conduct between filter and the metallic shield shell at high frequency and add one deck insulating material.
Description of drawings
Fig. 1 uses electromagnetic compatibility filter circuit figure always
Fig. 2 high frequency conduction filter graph architecture
Fig. 3 high frequency conduction filter equivalent electric circuit
Fig. 4 enhancement mode high frequency conduction filter graph architecture
Embodiment
Select for use circular metal conductor (hollow or solid conductor) to be processed into the radio-frequency transmissions conductor, structure as shown in Figure 2; The high frequency absorption material is coated on (sintering or bonding) on the radio-frequency transmissions conductor; High-frequency filter capacitor is connected on the signal upstream end lead, and the electric capacity other end connects screening can; Screening can ground connection.Signal input lead and output lead should use electromagnetic shielding line.
Operation principle:
When high frequency harassing and wrecking signal transmitted along conductor, a part formed radio environment along conductive surface to external radiation; The high frequency absorption material absorbs the radio environment signal along the emission conductive surface, and the electromagnetic energy of radio environment signal is converted to heat energy, and thermal energy consumption is in the high frequency absorption material.The high frequency absorption material is equivalent to an alternating-current resistance, can stop the transmission of high frequency harassing and wrecking signal, for this reason, at the high-frequency filter capacitor of signal input part connection ground connection, provides the high frequency harassing and wrecking signal passage that ground is gone in a bypass.
Equivalent circuit Fig. 3.Alternating-current resistance is equivalent to a resistance and an inductance series connection, and resistance value and inductance value are all with frequency change; Ground capacity at input constitutes the high frequency bypass circuit.
High frequency conduction filter characteristics:
(1) not only can suppress high frequency harassing and wrecking signal, can harass energy by the bypass high frequency simultaneously;
(2) the radio-frequency transmissions conductor uses planar structure, can at utmost reduce distributed capacitance, reduces the phenomenon that occurs crosstalking;
(3) the radio-frequency transmissions conductor uses open loop structure, can at utmost reduce distributed inductance, reduces the possibility that resonance occurs;
(4) use the metallic shield shell, not only eliminated the leakage problem of internal radio frequency signal, avoided of the influence of outside harassing and wrecking signal simultaneously transmission signals;
(5) input lead and output lead use shielding conductor, can prevent that high frequency harassing and wrecking signal is directly coupled to wire of output terminal from the input lead.
Radio-frequency transmissions conductor feature:
(1) effect of radio-frequency transmissions conductor is radiated radio frequency (RF) harassing and wrecking in transmission current.Be made of metal material, conductor commonly used is metal alloys such as copper, aluminium, iron.
(2) shape of radio-frequency transmissions conductor such as Fig. 1 vertical view are parallel and bend away ring structure in a plane, reduced distributed capacitance and distributed inductance.
(3) sectional area of radio-frequency transmissions conductor depends on the size of current of passing through.Electric current is big, and sectional area is big; Electric current is little, and sectional area is little.
(4) in order to strengthen skin effect
[3], select the circular solids lead during little electric current for use, select the circular hollow lead for use during big electric current, conductive line surfaces is through coarse processing.
The high frequency absorption material characteristics:
(1) effect of high frequency absorption material is absorbing high-frequency harassing and wrecking signals, and Main Ingredients and Appearance is a soft magnetic material
[4]Thickness is big more, and assimilation effect is good more, is difficult for saturated more.Different soft magnetic materials has different optimal absorption frequency ranges, and magnetic permeability is high more usually, and the lower-frequency limit of inhibition is low more.Select the material that magnetic permeability is big, saturation magnetization is high, as ferromagnetic oxide powder, carbonyl iron dust etc.
(2) to low-frequency range (referring to less than 1MHz here), the absorbing material loss is very little, although the high frequency absorption material has higher magnetic permeability; Because the open loop in one plane of radio-frequency transmissions conductor distributes (not forming the closed-loop path), therefore the inductance value that produces is less, and the conductor internal resistance is also very little, and the whole piece cable is the lead of a small inductor small resistor.
(3) to high band (referring to greater than 1MHz here), along with frequency raises, the magnetic permeability of high frequency absorption material reduces, and inductance value reduces, and the loss of high frequency absorption material increases, and the alternating-current resistance composition increases, and can keep higher impedance in quite wide frequency range.When high-frequency signal passed through the high frequency absorption material, the form that radio environment was absorbed and converted to heat energy dissipated, thereby realized the high-frequency suppressing effect.
(4) the high frequency absorption material can the direct sintering moulding, also can mix with the heatproof binding agent to constitute, and closely is coated on the conductor thread core equably.Thickness is big more, and assimilation effect is good more, is difficult for saturated more.
The high-frequency filter capacitor feature:
The effect of high-frequency filter capacitor is bypass high frequency harassing and wrecking signals, should select the high pressure ceramic disc capacitor for use, and wiring is short more good more.
The metallic shield cover characteristics:
The effect of metallic shield sheathing material is crosstalking of the inside and outside high-frequency signal of shielding, can select copper, aluminium, ferroalloy etc. for use.In order to realize filter function, shell is answered ground connection; Shell is earth-free can only realize the high frequency absorption function.
Input lead/output lead feature:
Input lead/output lead is used for the transmission signals electric current, selects the insulated conductor of band metallic shield overcoat for use.
The insulating protective layer feature:
The effect of insulating protective layer is to electric insulation, prevents the leaky that radio-frequency transmissions conductor or high-frequency filter capacitor may occur.
The mutation of high frequency conduction filter:
Based on the structure of Fig. 1, big electric current is harassed situation by force, select for use the thick conductor of diameter as the radio-frequency transmissions conductor, vertically pass the radio-frequency transmissions conductor with thin wire, form sending antenna structure, strengthen radio-frequency transmissions efficient, as shown in Figure 4.In order to reduce distributed capacitance, antenna structure is unsuitable oversize.
Using method:
Input termination input signal, output termination output signal, the earthing of casing.
List of references:
[1]Wikipedia.Radio?frequency[EB/OL].http://en.wikipedia.org/wiki/Radio_frequency，2010-11-26/2010-12-01.
[2] Baidu's encyclopaedia. magnetic bead [EB/OL] .http: //baike.baidu.com/view/261693.htm, 2010-08-17/2010-12-01.
[3]Wikipedia.Skin?effect[EB/OL].http://en.wikipedia.org/wiki/Skin_effect，2010-11-28/2010-12-01.
[4] Baidu's encyclopaedia. soft magnetic material [EB/OL] .http: //baike.baidu.com/view/30113.htm, 2010-08-26/2010-12-01.
Claims (1)
1. a high frequency conducts filter, and plain conductor is designed to the radio-frequency transmissions conductor, and the high frequency absorption material is coated on the emission conductor, makes the alternating-current resistance with radio environment absorption function; Connect the high-frequency filter capacitor of ground connection at the signal input part of alternating-current resistance, realize the High frequency filter function; Alternating-current resistance and high-frequency filter capacitor constitute high frequency conduction filter jointly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206448803U CN202009367U (en) | 2010-12-07 | 2010-12-07 | High frequency conduction wave filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206448803U CN202009367U (en) | 2010-12-07 | 2010-12-07 | High frequency conduction wave filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202009367U true CN202009367U (en) | 2011-10-12 |
Family
ID=44751019
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206448803U Expired - Fee Related CN202009367U (en) | 2010-12-07 | 2010-12-07 | High frequency conduction wave filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202009367U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9920909B2 (en) | 2012-02-03 | 2018-03-20 | Philips Lighting Holding B.V. | Lighting driver and housing having internal electromagnetic shielding layer configured for direct connection to circuit ground |
| CN108288848A (en) * | 2018-03-09 | 2018-07-17 | 天地（常州）自动化股份有限公司 | Underground coal mine motor electric leakage blocking device |
| CN113054332A (en) * | 2019-12-27 | 2021-06-29 | 阿里巴巴集团控股有限公司 | Filter and quantum chip measurement and control system |
-
2010
- 2010-12-07 CN CN2010206448803U patent/CN202009367U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9920909B2 (en) | 2012-02-03 | 2018-03-20 | Philips Lighting Holding B.V. | Lighting driver and housing having internal electromagnetic shielding layer configured for direct connection to circuit ground |
| CN108288848A (en) * | 2018-03-09 | 2018-07-17 | 天地（常州）自动化股份有限公司 | Underground coal mine motor electric leakage blocking device |
| CN108288848B (en) * | 2018-03-09 | 2024-05-03 | 天地（常州）自动化股份有限公司 | Electric leakage locking device for underground coal mine motor |
| CN113054332A (en) * | 2019-12-27 | 2021-06-29 | 阿里巴巴集团控股有限公司 | Filter and quantum chip measurement and control system |
| CN113054332B (en) * | 2019-12-27 | 2023-02-28 | 阿里巴巴集团控股有限公司 | Filter and quantum chip measurement and control system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4194019B2 (en) | Signal transmission cable with connector | |
| US20010042632A1 (en) | Filter for wire and cable | |
| TWI482585B (en) | Shielding composite diaphragm | |
| KR102569682B1 (en) | Magnetic core, inductor and emi filter comprising the same | |
| KR102359198B1 (en) | noise suppression assembly | |
| JP2017051085A (en) | Active noise suppressing device | |
| CN202009367U (en) | High frequency conduction wave filter | |
| JP2866054B2 (en) | Line radiation prevention element | |
| WO2020147853A1 (en) | Wireless energy transmission device with noise reduction design | |
| KR101765482B1 (en) | Installation method for attenna apparatus with ntc attenna annd wireless charging coil | |
| KR101765487B1 (en) | Installation method for attenna apparatus with ntc attenna annd wireless charging coil | |
| CN202110880U (en) | High-frequency conduction absorbing cable | |
| CN206610637U (en) | The insulated electric conductor and integrated inductor wave filter and inductor of a kind of magnetic glue insulating wrapped | |
| CN212136184U (en) | Low-loss high-power common mode inductor | |
| CN207124107U (en) | A kind of wireless electric energy transmission device with electromagnet shield effect | |
| CN205810511U (en) | A kind of common mode inductance | |
| CN207302830U (en) | A kind of anti-short-circuit common mode inductance | |
| KR102483815B1 (en) | Hybrid Inductor and EMI Filter Using the Same | |
| JP5912278B2 (en) | Electromagnetic interference suppressor | |
| CN109559868A (en) | A kind of high power plate electromagnetic interface filter | |
| CN202068186U (en) | Combined type filter used for shielding shelter power and signal of low-leakage current | |
| KR100621422B1 (en) | Multi-Layer Type Flexible Electro-magnetic wave absorber | |
| JP3142060B2 (en) | Noise filter | |
| CN203119064U (en) | Enhancement type high-frequency transduction filter | |
| CN213462857U (en) | Electromagnetic radiation suppression device and electronic component |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111012 Termination date: 20151207 |
|
| EXPY | Termination of patent right or utility model |