CN205725450U - EMI filter and power EMI filter access circuit - Google Patents
EMI filter and power EMI filter access circuit Download PDFInfo
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- CN205725450U CN205725450U CN201620552295.8U CN201620552295U CN205725450U CN 205725450 U CN205725450 U CN 205725450U CN 201620552295 U CN201620552295 U CN 201620552295U CN 205725450 U CN205725450 U CN 205725450U
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 35
- 238000004804 winding Methods 0.000 claims description 23
- 229910052742 iron Inorganic materials 0.000 claims description 8
- 238000003780 insertion Methods 0.000 abstract description 13
- 230000037431 insertion Effects 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 7
- 238000001914 filtration Methods 0.000 abstract description 4
- 239000003990 capacitor Substances 0.000 abstract 6
- 238000010586 diagram Methods 0.000 description 7
- 230000004907 flux Effects 0.000 description 7
- 230000005611 electricity Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000004832 voltammetry Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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Abstract
The utility model provides a EMI wave filter and power EMI wave filter access circuit, wherein, this EMI wave filter includes: an adjustable common mode inductor; the first differential mode working capacitor is connected with the input end of the adjustable common mode inductor in parallel; the second differential mode working capacitor is connected with the output end of the adjustable common mode inductor in parallel; the input end of the adjustable differential mode inductor is connected with the output end of the adjustable common mode inductor in series; the first common mode working capacitor and the second common mode working capacitor are connected with the input end of the adjustable differential mode inductor in series, and a parallel structure is formed between the first common mode working capacitor and the second common mode working capacitor. Through the embodiment of the utility model provides a make EMI wave filter can provide higher insertion loss in conducted interference frequency range to furthest attenuates EMI signal, makes the electromagnetism of equipment can satisfy the standard, has effectively improved the filtering effect.
Description
Technical field
This utility model relates to circuit filtering technical field, in particular to a kind of electromagnetic interface filter and power supply EMI filter
Ripple device accesses circuit.
Background technology
Along with electronic product and the extensive application of the converting means relevant with power electronic devices, electromagnetic interference
(Electromagnetic Interference, referred to as EMI) is day by day serious, and becomes a kind of public hazards.Air-conditioning produces
Conduction Interference can be reduced in the range of electromagnetic compatibility standard requires by EMI power-supply filter.The insertion of electromagnetic interface filter
Loss has direct relation, therefore, even if the insertion loss design load of electromagnetic interface filter can reach with source impedance and load impedance
Standard, if to electromagnetic interface filter improper use, it is also possible to can not get optimal filter because of source impedance and the change of load impedance
Ripple effect.
For the problems referred to above, effective solution is the most not yet proposed.
Utility model content
This utility model embodiment provides a kind of electromagnetic interface filter, and in order to improve filter effect, this electromagnetic interface filter includes:
Adjustable common mode inductance；First differential mode mutual capacitance, in parallel with the input of described adjustable common mode inductance；Second differential mode
Mutual capacitance, in parallel with the outfan of described adjustable common mode inductance；Adjustable differential mode inductance, input and described adjustable common mode inductance
Outfan series connection；First common mode operation electric capacity and the second common mode operation electric capacity, with the input string of described adjustable differential mode inductance
Connection, described first common mode operation electric capacity and described second common mode operation electric capacity form parallel-connection structure each other；Wherein, described
One differential mode mutual capacitance and described second differential mode mutual capacitance form two-stage LC-filter with described adjustable differential mode inductance.
In one embodiment, above-mentioned electromagnetic interface filter also includes: bleeder resistance, is connected in parallel on described adjustable common mode inductance
Outfan and the input of described adjustable differential mode inductance between.
In one embodiment, above-mentioned electromagnetic interface filter also includes: controller, with the input port of described electromagnetic interface filter
It is connected with the output port of described electromagnetic interface filter, for sampling the voltage and current signal of described electromagnetic interface filter input port and defeated
Go out the voltage and current signal of port, and according to the voltage and current signal of described input port and the voltage and current signal of output port
Calculate source impedance and load impedance, determine described adjustable common mode inductance and described adjustable according to described source impedance and load impedance
The inductance value of differential mode inductance.
In one embodiment, the iron core of described adjustable common mode inductance is tubular structure, described adjustable differential mode inductance
Iron core is tubular structure.
In one embodiment, described adjustable common mode inductance is around with exchange along tubular iron in-core and controls winding, along managing
Being surrounded with direct current main winding outside shape iron core, wherein, alternating current-direct current winding and corresponding alternating current-direct current magnetic flux are mutually orthogonal.
In one embodiment, described adjustable differential mode inductance is around with DC control winding along tubular iron in-core, along pipe
Being surrounded with exchanging main winding outside shape iron core, wherein, alternating current-direct current winding and corresponding alternating current-direct current magnetic flux are mutually orthogonal.
This utility model embodiment additionally provides a kind of EMI power filter and accesses circuit, and this circuit includes: power supply；Source
Impedance, with described power sources in series；Above-mentioned electromagnetic interface filter, input port forms parallel-connection structure with described power supply and described source impedance；
Load impedance, forms parallel-connection structure with the output port of described electromagnetic interface filter.
In the above-described embodiments, electromagnetic interface filter is provided with the inductance of two Parameter adjustable, common mode operation electric capacity of arranging in pairs or groups
A power supply EMI dual stage filter is formed with differential mode mutual capacitance, because the parameter of inductance is adjustable, therefore can be according to reality
Border needs to carry out the adjustment of inductance parameters, so that electromagnetic interface filter can be able to provide relatively in Conduction Interference frequency range
High insertion loss, in order to EMI signal of farthest decaying so that the electromagnetism of equipment can meet standard, is effectively improved filter
Ripple effect.
Accompanying drawing explanation
The accompanying drawing of the part constituting the application is used for providing being further appreciated by of the present utility model, of the present utility model
Schematic description and description is used for explaining this utility model, is not intended that improper restriction of the present utility model.At accompanying drawing
In:
Fig. 1 is the circuit diagram of the electromagnetic interface filter according to this utility model embodiment；
Fig. 2 is the circuit diagram that the EMI power filter according to this utility model embodiment accesses circuit；
Fig. 3 is the physical circuit schematic diagram of the electromagnetic interface filter according to this utility model embodiment；
Fig. 4 is the electromagnetic structure schematic diagram of the adjustable common mode inductance according to this utility model embodiment；
Fig. 5 is the electromagnetic structure schematic diagram of the adjustable differential mode inductance according to this utility model embodiment.
Detailed description of the invention
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with embodiment and attached
Figure, is described in further details this utility model.Here, exemplary embodiment of the present utility model and explanation thereof are used for solving
Release this utility model, but be not intended as restriction of the present utility model.
Parameter in view of each device of conventional air conditioner power source electromagnetic interface filter is all fixing, due to source impedance and
The change of load impedance, often can not get preferable filter effect.To this end, provide one in this utility model embodiment
Electromagnetic interface filter, as it is shown in figure 1, may include that
Adjustable common mode inductance L1；Differential mode mutual capacitance CX, in parallel with the input of adjustable common mode inductance L1；Common mode operation electricity
Hold CY and adjustable differential mode inductance L2 and form LC second-order filter；Adjustable differential mode inductance L2, input is defeated with adjustable common mode inductance L1's
Go out end series connection；Differential mode mutual capacitance CX connects in the loop, eliminates difference mode signal common mode operation electric capacity CY and is directly grounded, eliminates altogether
Mould signal,
In the above-described embodiments, electromagnetic interface filter is provided with the inductance of two Parameter adjustable, common mode operation electric capacity of arranging in pairs or groups
A power supply EMI dual stage filter is formed with differential mode mutual capacitance, because the parameter of inductance is adjustable, therefore can be according to reality
Border needs to carry out the adjustment of inductance parameters, so that electromagnetic interface filter can be able to provide relatively in Conduction Interference frequency range
High insertion loss, in order to EMI signal of farthest decaying so that the electromagnetism of equipment can meet standard.
As it is shown in figure 1, electromagnetic interface filter can also include: bleeder resistance R, it is connected in parallel on the output of described adjustable common mode inductance
Between end and the input of described adjustable differential mode inductance, the resistance of R is higher, when not working, R releases rapidly and is stored in CX
Electricity, in order to avoid electric shock operator.
In order to realize the regulation of the inductance value to controllable impedance, above-mentioned electromagnetic interface filter can also arrange a controller, should
Controller is connected with the input port of electromagnetic interface filter and the output port of electromagnetic interface filter, is used for electromagnetic interface filter input of sampling
Mouthful voltage and current signal and the voltage and current signal of output port, and according to the voltage and current signal of input port and outfan
Mouthful voltage and current signal calculate source impedance and load impedance, according to source impedance and load impedance determine adjustable common mode inductance and
The inductance value of adjustable differential mode inductance.
Concrete, the iron core of above-mentioned adjustable common mode inductance L1 can be tubular structure, the iron core of adjustable differential mode inductance L2
Can be tubular structure, adjustable common mode inductance be around with exchange along tubular iron in-core and controls winding, is wound with along tubulose iron core periphery
Direct current main winding, wherein, alternating current-direct current winding and corresponding alternating current-direct current magnetic flux are mutually orthogonal.Adjustable differential mode inductance is along tubular iron in-core
It is around with DC control winding, is wound with exchange main winding, wherein, alternating current-direct current winding and corresponding alternating current-direct current along tubulose iron core periphery
Magnetic flux is mutually orthogonal.
In this utility model embodiment, additionally provide a kind of EMI power filter based on above-mentioned electromagnetic interface filter to access
Circuit, this circuit includes: power supply；Source impedance, with power sources in series；Electromagnetic interface filter, input port and described power supply and the resistance of described source
Anti-formation parallel-connection structure；Load impedance, forms parallel-connection structure with the output port of electromagnetic interface filter.
That is, a kind of Parameter adjustable single phase poaer supply electromagnetic interface filter control method is proposed, by detection input, output end voltage
Current signal calculates source impedance and load impedance, then coupling electromagnetic interface filter Two-port netwerk impedance, in Conduction Interference frequency range
The insertion loss that interior offer is higher, makes EMI signal obtain the decay of maximum.
Below in conjunction with a specific embodiment, above-mentioned electromagnetic interface filter and EMI power filter are accessed circuit to illustrate,
It is important to note, however, that this specific embodiment is merely to be better described this utility model, it is not intended that this practicality new
The improper restriction of type.
It is insertion transferred-impedance net between interference source and sensitive equipment in view of the purpose accessing electromagnetic interface filter in circuit
Network, it can make the smooth mistake of useful signal, limit useless EMI signal and pass through, so that along the EMI signal of line transmission
Energy is attenuated to minimum.Insertion loss is the important indicator weighing electromagnetic interface filter performance, refers to that wave filter does not has line attachment
Time and line attachment after sent to the power ratio of load by source.
For source impedance ZS and load impedance ZL circuit not etc., if as in figure 2 it is shown, by a port identity impedance
The preferable two-port network of ZC1 and ZC2 respectively equal to source internal resistance ZS and load impedance ZL be connected on source and negative cut out between, the most now two
Port network only plays coupling hindrance function, and the power that source can be provided by will all be supported absorption.
As it is shown on figure 3, the circuit of wave filter is passive network, it has reciprocity, and load is received the power end of filtering
(Lin end and Nin end), or receive load end (Lout end and Nout end), the most all it is possible, particularly at the internal resistance of source
When (source impedance) is equal with load resistance (load impedance), the insertion loss that this interchangeability records also is equal.Such as Fig. 3 institute
Be shown as the single phase poaer supply electromagnetic interface filter circuit topology schematic diagram of Parameter adjustable, EMI power filter be by common mode filtering circuit and
Differential mode filter circuit is comprehensively constituted, and L1 is common mode choke, and L2 is differential mode choke coil, and CX is differential mode mutual capacitance, and CY is common mode
Mutual capacitance, R is bleeder resistance (resistance is higher), when not working, R the electricity being stored in CX of releasing rapidly, Yi Mian electricity
Hit operator.
It is illustrated in figure 4 the electromagnetic structure schematic diagram of adjustable common mode inductance, is illustrated in figure 5 the electromagnetism of adjustable differential mode inductance
Structural representation, iron core uses tubular structure, and adjustable differential mode inductance is around with DC control winding along tubular iron in-core, along tubulose
Being surrounded with outside iron core exchanging main winding, adjustable common mode inductance is around with exchange along tubular iron in-core and controls winding, along tubulose iron core
It is surrounded with outward direct current main winding, alternating current-direct current winding and corresponding alternating current-direct current magnetic flux thereof mutually orthogonal.Therefore, alternating current-direct current magnetic flux is mutual
Not affecting, DC current does not interferes with the linear characteristic of reactor.Additionally, the core structure that DC circuit magnetic loop is Guan Bi, produce relatively
Needed for strong DC control magnetic field, dc power is less, and horizontal D.C. magnetic field is the strongest, then longitudinal flux conductance is the lowest.From the angle of energy
Degree is said, the existence of horizontal D.C. magnetic field improves the anisotropy energy of iron core, thus inhibits the pcrmeability of iron core.With regard to adjustable electric
For sense, when without superposition D.C. magnetic field, the pcrmeability of iron core is the highest, and inductance value is the most maximum.Along with the enhancing of D.C. magnetic field, ferrum
The core pcrmeability in AC magnetic field direction declines, thus the inductance value of inductance reduces therewith.
The insertion loss of electromagnetic interface filter has direct relation with source impedance and load impedance, therefore, even if electromagnetic interface filter
Insertion loss design load is up to standard, if its improper use is also possible to can not get because of source impedance and the change of load impedance
Good filter effect, it could even be possible to make EMI signal obtain gain because there is resonance.Sampling filter input in this example
Port and output port voltage, current signal, can calculate corresponding source impedance and load impedance in input MCU, and MCU passes through
Pwm signal controls DC source output to be come, thus changes the inductance value of controllable impedance, it is achieved the Dynamic Matching of impedance.
Another the fairly simple algorithm in voltammetry is used to design RLC digital electric bridge, i.e. only it is to be understood that tested unit
The voltage at part two ends and the electric current flowing through testing element, it is possible to determine the impedance of detected element, again because measuring resistance is
Known, therefore, as long as recording the voltage of standard resistor at two terminals.Tested impedance ZxThe voltage U at two endsxWith normal impedance Zs
The voltage U at two endssBetween relation be:
Zx=Ux/Ix=Ux/Us Rs
Above-mentioned electromagnetic interface filter is applied in air conditioner power source, when compressor of air conditioner changed power, ensures that impedance is with this
Under conditions of big mismatch, when making filter network real work, existing bigger insertion loss, there is again the reflection loss of maximum, from
And realize the effective suppression to EMI signal.
As can be seen from the above description, this utility model embodiment achieves following technique effect: filter at EMI
Device is provided with the inductance of two Parameter adjustable, collocation common mode operation electric capacity and differential mode mutual capacitance and forms a power supply EMI two
Level wave filter, because the parameter of inductance is adjustable, therefore can carry out the adjustment of inductance parameters according to actual needs, so that
Obtain the insertion loss that electromagnetic interface filter can provide higher in Conduction Interference frequency range, in order to farthest decay
EMI signal so that the electromagnetism of equipment can meet standard.
The foregoing is only preferred embodiment of the present utility model, be not limited to this utility model, for this
For the technical staff in field, this utility model embodiment can have various modifications and variations.All in spirit of the present utility model
Within principle, any modification, equivalent substitution and improvement etc. made, within should be included in protection domain of the present utility model.
Claims (8)
1. an electromagnetic interface filter, it is characterised in that including:
Adjustable common mode inductance；
First differential mode mutual capacitance, in parallel with the input of described adjustable common mode inductance；
Second differential mode mutual capacitance, in parallel with the outfan of described adjustable common mode inductance；
Adjustable differential mode inductance, input is connected with the outfan of described adjustable common mode inductance；
First common mode operation electric capacity and the second common mode operation electric capacity, connect with the input of described adjustable differential mode inductance, and described
One common mode operation electric capacity and described second common mode operation electric capacity form parallel-connection structure each other；
Wherein, described first differential mode mutual capacitance and described second differential mode mutual capacitance form second order with described adjustable differential mode inductance
LC wave filter.
Electromagnetic interface filter the most according to claim 1, it is characterised in that also include: bleeder resistance, is connected in parallel on described adjustable
Between outfan and the input of described adjustable differential mode inductance of common mode inductance.
Electromagnetic interface filter the most according to claim 1, it is characterised in that also include:
Controller, is connected with the output port of the input port of described electromagnetic interface filter and described electromagnetic interface filter, is used for the institute that samples
State the voltage and current signal of electromagnetic interface filter input port and the voltage and current signal of output port, and according to described input port
Voltage and current signal and the voltage and current signal of output port calculate source impedance and load impedance, according to described source impedance and
Load impedance determines described adjustable common mode inductance and the inductance value of described adjustable differential mode inductance.
Electromagnetic interface filter the most according to any one of claim 1 to 3, it is characterised in that the ferrum of described adjustable common mode inductance
Core is tubular structure, and the iron core of described adjustable differential mode inductance is tubular structure.
Electromagnetic interface filter the most according to claim 4, it is characterised in that described adjustable common mode inductance is along outside tubular iron in-core
It is wound with exchange and controls winding, be wound with direct current main winding, wherein, alternating current-direct current winding and corresponding alternating current-direct current magnetic along tubulose iron core periphery
Logical mutually orthogonal.
Electromagnetic interface filter the most according to claim 4, it is characterised in that described adjustable differential mode inductance is along outside tubular iron in-core
It is wound with DC control winding, is wound with exchange main winding, wherein, alternating current-direct current winding and corresponding alternating current-direct current magnetic along tubulose iron core periphery
Logical mutually orthogonal.
7. an EMI power filter accesses circuit, it is characterised in that including:
Power supply；
Source impedance, with described power sources in series；
Electromagnetic interface filter according to any one of claim 1 to 6, input port is formed also with described power supply and described source impedance
Connection structure；
Load impedance, forms parallel-connection structure with the output port of described electromagnetic interface filter.
EMI power filter the most according to claim 7 accesses circuit, it is characterised in that described power supply is air conditioner power source.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620552295.8U CN205725450U (en) | 2016-06-08 | 2016-06-08 | EMI filter and power EMI filter access circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620552295.8U CN205725450U (en) | 2016-06-08 | 2016-06-08 | EMI filter and power EMI filter access circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2017211104A1 (en) * | 2016-06-08 | 2017-12-14 | 珠海格力电器股份有限公司 | Emi filter and power emi filter access circuit |
| CN109687805A (en) * | 2018-12-29 | 2019-04-26 | 淄博京科电气有限公司 | A kind of controller of the switched reluctance machines for new-energy automobile |
| CN112303805A (en) * | 2020-10-19 | 2021-02-02 | 青岛海信日立空调***有限公司 | Communication circuit and air conditioner |
| CN112303806A (en) * | 2020-10-19 | 2021-02-02 | 青岛海信日立空调***有限公司 | Communication circuit and air conditioner |
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2016
- 2016-06-08 CN CN201620552295.8U patent/CN205725450U/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017211104A1 (en) * | 2016-06-08 | 2017-12-14 | 珠海格力电器股份有限公司 | Emi filter and power emi filter access circuit |
| CN107482896A (en) * | 2016-06-08 | 2017-12-15 | 珠海格力电器股份有限公司 | EMI filter and power EMI filter access circuit |
| CN107359784A (en) * | 2017-09-05 | 2017-11-17 | 贵州航天林泉电机有限公司 | A kind of the input EMC wave filters and preparation method of HVDC input power supply |
| CN107359784B (en) * | 2017-09-05 | 2019-11-08 | 贵州航天林泉电机有限公司 | A kind of the input EMC filter and production method of high voltage direct current input power supply |
| CN109687805A (en) * | 2018-12-29 | 2019-04-26 | 淄博京科电气有限公司 | A kind of controller of the switched reluctance machines for new-energy automobile |
| CN112303805A (en) * | 2020-10-19 | 2021-02-02 | 青岛海信日立空调***有限公司 | Communication circuit and air conditioner |
| CN112303806A (en) * | 2020-10-19 | 2021-02-02 | 青岛海信日立空调***有限公司 | Communication circuit and air conditioner |
| CN112303806B (en) * | 2020-10-19 | 2023-11-17 | 青岛海信日立空调***有限公司 | Communication circuit and air conditioner |
| CN112303805B (en) * | 2020-10-19 | 2023-11-28 | 青岛海信日立空调***有限公司 | Communication circuit and air conditioner |
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