CN108075628A - Electromagnetic compatibility wave filter and household electrical appliance - Google Patents
Electromagnetic compatibility wave filter and household electrical appliance Download PDFInfo
- Publication number
- CN108075628A CN108075628A CN201611018755.XA CN201611018755A CN108075628A CN 108075628 A CN108075628 A CN 108075628A CN 201611018755 A CN201611018755 A CN 201611018755A CN 108075628 A CN108075628 A CN 108075628A
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- electromagnetic compatibility
- wave filter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
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Abstract
The present invention relates to electromagnetic compatibility technical field of filtering, disclose a kind of electromagnetic compatibility wave filter and household electrical appliance, and wherein the electromagnetic compatibility wave filter includes：Power interface, power interface are used to be connected to AC power；Rectification module, rectification module include ac input end mouth and direct current output port, and wherein ac input end mouth includes exchange input FireWire port port and includes direct-flow positive pole port and direct current cathode port with input zero curve port and direct current output port is exchanged；Capacitance, capacitance bridge the exchange input FireWire port port of rectification module and exchange input zero curve port between rectification module and power interface；Inductance, the first end of inductance are connected to direct-flow positive pole port, are adapted to load between the second end of inductance and direct current cathode port.There is provided as a result, it is a design it is simple, of low cost and can so that household appliances meet household electrical appliances EMC test defined electromagnetic compatibility wave filter.
Description
Technical field
The present invention relates to electromagnetic compatibility technical field of filtering, and in particular, to a kind of electromagnetic compatibility wave filter and household electric
Device.
Background technology
Electrical equipment is connected to power grid by power cord, and the interference signal that electrical equipment itself generates can pass through power cord
It passes on power grid, online other equipment is formed and is endangered.For this purpose, household electrical appliances EMC (Electro Magnetic are formulated
Compatibility Electro Magnetic Compatibilities) test regulation define conduction test frequency range and the amplitude of the in-band signal
Limit value, to ensure that electrical equipment access power grid will not cause signal contamination to power grid.
On the one hand, in order to be tested by household electrical appliances EMC, household electrical appliances business men needs to add EMC filter circuit for household appliances.It is existing
In technology Π types either multiple-order low-pass filter circuit and the filter of the Π types or multiple-order low-pass are added generally by power end
Wave circuit is mostly by the way of the multistage filtering formed based on common mode inductance plus differential mode filter circuit so that household appliances
It can be tested by EMC；But production cost can be caused to increase using multiple-order low-pass filter circuit, more reduce power supply conversion
Efficiency, while also increase the complexity of circuit design in household appliances.
On the other hand, with the revision of the new household electrical appliances EMC tests regulation of IEC 2016, by the frequency range of conduction test by
150kHz~30MHz is changed to 9KHz~30MHz.Obviously, filtered for the EMC designed by old household electrical appliances EMC test laws and regulations requirements
Circuit can not meet the requirement of EMC test regulations compared with the filter effect of household appliances.
It follows that a design is simple, of low cost and household appliances can be caused to meet household electrical appliances EMC test defineds
Electromagnetic compatibility wave filter is current industry technical barrier urgently to be resolved hurrily.
It is found it should be noted that Yi Shang technical problem is the present inventor during the present invention is put into practice.
The content of the invention
It is simple, of low cost and can be so that household appliances pass through household electrical appliances that the purpose of one aspect of the present invention is to provide a kind of design
The electromagnetic compatibility wave filter of EMC tests；The purpose of another aspect of the present invention is to provide a kind of comprising above-mentioned electromagnetic compatibility wave filter
Household electrical appliance, the technical issues of at least to solve to illustrate in above-mentioned background technology.
To achieve these goals, on the one hand the embodiment of the present invention provides a kind of electromagnetic compatibility wave filter, including：
Power interface, above-mentioned power interface are used to be connected to AC power；
Rectification module, above-mentioned rectification module include ac input end mouth and direct current output port, wherein above-mentioned exchange inputs
Port includes exchange input FireWire port port and includes direct-flow positive pole end with input zero curve port and above-mentioned direct current output port is exchanged
Mouth and direct current cathode port；
Capacitance, above-mentioned capacitance bridge above-mentioned rectification module between above-mentioned rectification module and above-mentioned power interface
Exchange input FireWire port port and above-mentioned exchange input zero curve port；
Inductance, the first end of above-mentioned inductance are connected to above-mentioned direct-flow positive pole port, in the second end of above-mentioned inductance and above-mentioned
Direct current cathode is adapted to load between port.
Preferably, above-mentioned capacitance is X-type safety capacitance.
Preferably, the size of the capacitance of above-mentioned capacitance is 0.1uF~10uF.
Preferably, the size of the capacitance of above-mentioned capacitance is 2uF~5.5uF.
Preferably, the size of the inductance value of above-mentioned inductance is 20uH~10mH.
Preferably, above-mentioned inductance comprising inductance coil and magnetic core, the size of the inductance value of above-mentioned inductance is 200-
400uH and above-mentioned magnetic core are amorphous magnetic core.
Preferably, above-mentioned inductance comprising inductance coil and magnetic core, the size of the inductance value of above-mentioned inductance is 300-
450uH and above-mentioned magnetic core are iron silicon magnetic core.
Preferably, above-mentioned inductance coil includes copper enameled wire and/or copper facing aluminium enamel-covered wire.
Preferably, in the electromagnetic compatibility circuit：
Wherein, f refers to the cutoff frequency of above-mentioned electromagnetic compatibility wave filter, and L refers to the inductance value of above-mentioned inductance, in C references
State the capacitance of capacitance.
Preferably, above-mentioned rectification module is rectifier bridge.
On the other hand the embodiment of the present invention provides a kind of household electrical appliance, including：Above-mentioned electromagnetic compatibility wave filter above；Electricity
Device control circuit, above-mentioned electrical apparatus control circuit include positive pole port and power cathode port；Above-mentioned positive pole port connects
The above-mentioned second end of above-mentioned inductance is connected to, above-mentioned power cathode port is connected to the above-mentioned direct current in above-mentioned electromagnetic compatibility wave filter
Cathode port.
Through the above technical solutions, the filtering of the electromagnetic compatibility with low-frequency filter characteristics formed based on inductance and capacitance
Device, can effective attenuation or filter out electric current working frequency range be more than cutoff frequency high-frequency noise, for attenuation low-frequency transduction make an uproar
Sound has a significant effect, and the electromagnetic compatibility wave filter also has that structure design is simple, increases electric energy thermal conversion efficiency, into
The advantages of this is low, is highly suitable for household electrical appliance, especially applies in small household appliances product.Further, due to the electromagnetism
Include rectification module in Compatibility filter so that the electromagnetic compatibility wave filter also has while having the function of em filtering
The characteristic of rectification can be used directly as DC power supply.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Description of the drawings
Attached drawing is for providing a further understanding of the present invention, and a part for constitution instruction, with following tool
Body embodiment is together for explaining the present invention, but be not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is illustrated that the structure diagram of the electromagnetic compatibility wave filter of one embodiment of the invention；
Fig. 2 is illustrated that the block schematic illustration using electromagnetic compatibility wave filter shown in FIG. 1；
Fig. 3 is illustrated that structural representation of the household electrical appliance comprising electromagnetic compatibility wave filter shown in Fig. 1 under an embodiment
Figure；
Fig. 4 A and Fig. 4 B are illustrated that when not including filter circuit in appliance circuit circuit, for appliance circuit circuit
EMC test results；
Fig. 5 A and Fig. 5 B are illustrated that when including Π mode filters in appliance circuit circuit, for appliance circuit circuit
EMC test results；
Fig. 6 be illustrated that when in appliance circuit circuit include the embodiment of the present invention in electromagnetic compatibility filter circuit when, pin
To the EMC test results in appliance circuit circuit.
Reference sign
10th, 201 electromagnetic compatibility wave filter, 20 household electrical appliance
202 electrical apparatus control circuit ACL, ACN AC power interfaces
L1Inductance C1Differential mode capacitor
AC rectifier bridges exchange end V+ rectifier bridge direct-flow positive poles end
V- rectifier bridge direct current negative pole ends
Specific embodiment
The specific embodiment of the present invention is described in detail below in conjunction with attached drawing.It should be appreciated that this place is retouched
The specific embodiment stated is merely to illustrate and explain the present invention, and is not intended to limit the invention.
Those skilled in the art of the present technique are appreciated that the wording " comprising " used in the specification of the present invention refers to that there are upper
Feature, integer, step, operation, element and/or component are stated, but it is not excluded that other one or more features of presence or addition,
Integer, step, operation, element, component and/or their group.It should be understood that when we claim element be " connected " or " coupled " to
During another element, it can be directly connected or coupled to other elements or there may also be intermediary elements.In addition, make here
" connection " or " coupling " can include wireless connection or wireless coupling.Wording "and/or" used herein include one or
The whole or any cell of more associated list items and all combination.
The structure diagram of the electromagnetic compatibility wave filter of one embodiment of the invention is illustrated that referring to Fig. 1, wherein, the electromagnetism
Compatibility filter 10 includes：AC power interface ACL and ACN are used to be connected to AC power；Capacitance C1, capacitance C1Both ends point
AC power interface ACL and ACN are not connected to, are hereby based on differential mode capacitor C1It can inhibit DM EMI；Rectifier bridge, this is whole
Flow two ac input ends (exchange input FireWire port port and exchange input zero curve port) of bridge respectively with AC power interface ACL
It is connected with ACN, and also includes inductance L in the electromagnetic compatibility wave filter1, inductance L1One end be connected to rectifier bridge
Direct-flow positive pole port V+, and be adapted to load between the second end of inductance and the direct current cathode port V-.So that
Electromagnetic compatibility wave filter has LC low-frequency filter characteristics.
In order to enable the present embodiment is easier to be understood by the public, following discloses should be simultaneous with low pass LC filtering characteristic electromagnetism
The design philosophy of capacitor filter device：High-frequency conduction noise on power interface (including power cord) can use differential mode and common-mode noise to believe
It number describes；Differential mode noise flows between two transfer wires, belongs to non-title property interference；Common-mode noise is in outflow conducting wire and ground
Between transmit, belong to symmetry interference, so needing to start in terms of differential mode and common mode two for the low-pass filtering of power interface.
Therefore, differential mode capacitor C is used in the present embodiment1To inhibit DM EMI.It is pointed out that the electromagnetic compatibility filter in the present invention
A part for the technical essential of ripple device is capacitance C1, rectifier bridge and inductance L1Relative position in the electromagnetic compatibility wave filter.
There is the circuit design mode of LC low-frequency filter characteristics so that the electromagnetic compatibility is filtered used by due to the electromagnetic compatibility wave filter
Ripple utensil has certain cutoff frequency, can will pass through the frequency range more than the cutoff frequency in the electric current of the electromagnetic compatibility wave filter
Interference signal decayed or filtered out.
In some optional embodiments of the present embodiment, inductance L of the selection with specific inductance value1With with specific electricity
The capacitance C of sensibility reciprocal1So that the electromagnetic compatibility wave filter has outstanding low pass LC filtering characteristics, by the electromagnetic compatibility of circuit
Property calibrates to aspiration level.Preferably, capacitance C1It is suitble to the safety capacitance for selecting the X-type of large capacity, capacitance C1Pressure voltage should
When the voltage value more than AC power, such as when by this circuit access Chinese power grid, differential mode capacitor C1Pressure voltage should
When more than 220V；Inductance L1Inductance coil (not shown) copper enameled wire and/or copper facing aluminium enamel-covered wire can be selected；Inductance L1's
Magnetic core (not shown) is selected from one or more of：Ferrite, iron silicon magnetic core, magnetic powder core, amorphous magnetic core, thus coordinate X-type
Safety capacitance can realize good filter effect.
It should be noted that the rectifier bridge in the present embodiment is only used as example, which can be by other components
It is replaced, should all be belonged to the scope of protection of the present invention as long as being that by the rectification module of the functional effect of corresponding rectification
It is interior.With reference to Fig. 2, the application of the electromagnetic compatibility wave filter provided to the present embodiment is further elaborated, in the straight of rectifier bridge
Flow output terminal can connecting circuit control circuit, which can choose utility grid, then correspondingly power interface ACL and
ACN can be respectively used to be connected to the firewire and zero curve of electricity network.
Structure of the household electrical appliance comprising electromagnetic compatibility wave filter shown in Fig. 1 under an embodiment is illustrated that referring to Fig. 3
Schematic diagram, which includes electromagnetic compatibility wave filter 201 and electrical apparatus control circuit 202, on electromagnetic compatibility wave filter
201 concrete structure may refer to the above description, therefore not in this to go forth.The electromagnetic compatibility wave filter is positioned close to power supply and connects
It at mouthful, and is connected with electrical control circuit, can effectively control the operating current frequency range of electrical control circuit under working condition, ensure work
Electrical control circuit under state can meet the regulation requirement of EMC tests without interference with utility grid.
It is understood that in order to enable the household electrical appliance 20 can be tested by household electrical appliances EMC, the present embodiment utilizes electromagnetism
Conduction power frequency is down to a value of below the lower limiting value 9KHz of EMC rules and regulations conduction test frequency ranges by Compatibility filter
2KHz.On the operation principle of its realization, it is the LC low-frequency filter characteristics using electromagnetic compatibility wave filter 201, is had based on it
Some cutoff frequencies, the interference signal that will be above the cutoff frequency electric current are decayed and are filtered out, and the wherein cutoff frequency can be with
By inductance L1Inductance value and capacitance C1Capacitance determine；In the present embodiment, on inductance L1With capacitance C1Type selecting and
It determines, it should be according to determined by the required EMC statutory standards reached；Further, as inductance L1Inductance value value
Scope is 20uH~10mH, capacitance C1Capacitance value range be 0.1uF~10uF when, can effective guarantee it is thus determined that
The cutoff frequency of electromagnetic compatibility wave filter disclosure satisfy that the requirement of EMC regulations；On above-mentioned inductance value and capacitance value range
Definite method can be：The Insertion Loss curve of EMC wave filters is made according to test data, surplus requirement, and then is acquired
Amplitude fading, using the value after the frequency multiplication of the amplitude fading/10 as the cutoff frequency of the EMC wave filters, then according to the cutoff frequency
The conversion of the correspondence of rate and capacitance and inductance value is with definite value range.
Since in filter circuit, the effect of capacitance is exactly to obstruct low frequency, the bigger low frequency of capacitance of capacitance by high frequency
It is less susceptible to pass through；In filtering, the capacitance of small capacitances amount is exactly to filter out high frequency, as capacitance swing exists in the present invention
The capacitance of 0.1uF-10uF is exactly used for filtering out high frequency, and collocation uses inductance L in filter circuit1, can realize preferably
Filter effect.More specifically, on inductance L1Inductance value and capacitance C1Specific value may be referred to formula：Wherein f refers to the cutoff frequency of above-mentioned electromagnetic compatibility wave filter；It should be noted that in order to accord with
Household electrical appliances EMC tests the requirement of regulation before being fated, and allows also for the factor that noise floats in filter circuit, should be by the electromagnetism
The cutoff frequency of Compatibility filter is arranged to a value of below the lower limiting value 9KHz of EMC rules and regulations conduction test frequency ranges, this
The cutoff frequency of selected filter circuit is 2KHz in embodiment, and the frequency range thus, it is possible to safeguard work electric current is in more than 9KHz
Interference signal can be effectively filtered out；It is understood that the cutoff frequency of filter circuit in the present embodiment for 2KHz only
Only as an example, filter circuit of the cutoff frequency less than 9KHz, which should also be, belongs to the protection domain that the present invention is covered.It is based on
The present embodiment just with single order LC filter circuits, just enables to household electrical appliance to meet the requirement of EMC regulations；Meanwhile it compares
Circuit design in multistage filter circuit or Π type filter circuits, this embodiment scheme is simple and can effectively reduce household electric
The additional production cost of device.
In the present embodiment, household electrical appliance 20 can be electromagnetic oven, because of the electromagnetic heating work of electromagnetic oven under normal circumstances
When current work frequency range be 20KHz~40KHz, it is clear that such current work frequency range be can not meet EMC test regulation
Requirement.But after electromagnetic compatibility circuit 10 is employed, it can realize under conditions of production cost control is ensured
Electromagnetic oven is tested by household electrical appliances EMC.It is understood that the household electrical appliance in the present embodiment should not only shall be limited only to the extent
Electromagnetic oven can also include the household electrical appliance such as washing machine, air-conditioning.
Need again to illustrate herein, disclosed in this invention inductance, capacitance specific type selecting and thus type selecting
Identified filter circuit is a key factor for realizing the goal of the invention of the present invention.Can so it understand, if for electricity
The type selecting of sense or capacitance is different from the present invention, is the part subject invention that can not achieve the present invention.In order to make inventive concept
More the public is made to be convinced with effect, be disclosed below and perform the related of EMC tests to DC power supply shown in Fig. 1 using the prior art
Emulation experiment data：
Selection on EMC test objects is specific as follows：
With reference to experimental subjects one：Not including in appliance circuit circuit has electromagnetic compatibility wave filter, correspondingly its result of the test
It is with reference to Fig. 4 A and 4B, EMC test result：It is exceeded serious；
With reference to experimental subjects two：Include the appliance circuit circuit of general Π mode filters, correspondingly its result of the test is joined
It is according to Fig. 5 A and 5B, EMC test result：Pass through；
Experimental subjects：Comprising the electromagnetic compatibility wave filter in the embodiment of the present invention, correspondingly its result of the test is with reference to Fig. 6,
EMC test results are：Pass through.
Also, although the electromagnetic compatibility wave filter in general Π mode filters and the present embodiment can be realized and pass through EMC
Test, but Fig. 5 A and Fig. 5 B are combined by comparison diagram 6, it can be found that：Using filter caused by the wave filter in the present embodiment
Ripple effect is also more outstanding than Π mode filter..
This type selecting parameter for continuing to disclose the capacitance and inductance under experimental subjects in the electromagnetic compatibility circuit now：Safety is thin
Film X capacitances, capacitance 2-5.5uF；Selection on inductance：Amorphous inductance：Its inductance value is 200uH-400uH.Due to
The relation of length, the present invention also select inductance and have carried out corresponding test in the iron silicon inductance that inductance value is 300-450uH,
The experimental result tested by EMC can be obtained.
The preferred embodiment of the present invention is described in detail above in association with attached drawing, still, the present invention is not limited to above-mentioned realities
The detail in mode is applied, within the scope of the technical concept of the present invention, a variety of letters can be carried out to technical scheme
Monotropic type, these simple variants all belong to the scope of protection of the present invention.
It is further to note that the specific technical features described in the above specific embodiments, in not lance
In the case of shield, can be combined by any suitable means in order to avoid unnecessary repetition, the present invention to it is various can
The combination of energy no longer separately illustrates.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should also be regarded as the disclosure of the present invention.
Claims (11)
1. a kind of electromagnetic compatibility wave filter, which is characterized in that including：
Power interface, the power interface are used to be connected to AC power；
Rectification module, the rectification module includes ac input end mouth and direct current output port, wherein the ac input end mouth
Comprising exchange input FireWire port port and exchange input zero curve port and the direct current output port comprising direct-flow positive pole port with
Direct current cathode port；
Capacitance, the capacitance bridge the described of the rectification module between the rectification module and the power interface
Exchange input FireWire port port and the exchange input zero curve port；
Inductance, the first end of the inductance are connected to the direct-flow positive pole port, second end and the direct current in the inductance
It is adapted to load between cathode port.
2. electromagnetic compatibility wave filter according to claim 1, it is characterised in that：
The capacitance is X-type safety capacitance.
3. electromagnetic compatibility wave filter according to claim 2, it is characterised in that：
The size of the capacitance of the capacitance is 0.1uF~10uF.
4. the circuit according to Claims 2 or 3, it is characterised in that：
The size of the capacitance of the capacitance is 2uF~5.5uF.
5. electromagnetic compatibility wave filter according to claim 4, it is characterised in that：
The size of the inductance value of the inductance is 20uH~10mH.
6. electromagnetic compatibility wave filter according to claim 5, the inductance includes inductance coil and magnetic core, and feature exists
In：
The size of the inductance value of the inductance for 200-400uH and
The magnetic core is amorphous magnetic core.
7. electromagnetic compatibility wave filter according to claim 5, the inductance includes inductance coil and magnetic core, and feature exists
In：
The size of the inductance value of the inductance for 300-450uH and
The magnetic core is iron silicon magnetic core.
8. the electromagnetic compatibility wave filter according to claim 6 or 7, it is characterised in that：
The inductance coil includes copper enameled wire and/or copper facing aluminium enamel-covered wire.
9. electromagnetic compatibility wave filter according to claim 5, it is characterised in that：
<mrow>
<mi>f</mi>
<mo>=</mo>
<mfrac>
<mn>1</mn>
<mrow>
<mn>2</mn>
<mi>&pi;</mi>
<msqrt>
<mrow>
<mi>L</mi>
<mi>C</mi>
</mrow>
</msqrt>
</mrow>
</mfrac>
<mo>&le;</mo>
<mn>2</mn>
<mi>K</mi>
<mi>H</mi>
<mi>z</mi>
</mrow>
Wherein, f refers to the cutoff frequency of the electromagnetic compatibility wave filter, and L refers to the inductance value of the inductance, and C refers to the electricity
The capacitance of appearance.
10. electromagnetic compatibility wave filter according to claim 1, it is characterised in that：The rectification module is rectifier bridge.
11. a kind of household electrical appliance, which is characterized in that including：
Claim 1-10 any one of them electromagnetic compatibility wave filters；
Electrical apparatus control circuit, the electrical apparatus control circuit include positive pole port and power cathode port；
The positive pole port is connected to the second end of the inductance, and the power cathode port is connected to the electromagnetism
The direct current cathode port in Compatibility filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611018755.XA CN108075628A (en) | 2016-11-18 | 2016-11-18 | Electromagnetic compatibility wave filter and household electrical appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611018755.XA CN108075628A (en) | 2016-11-18 | 2016-11-18 | Electromagnetic compatibility wave filter and household electrical appliance |
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| Publication Number | Publication Date |
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| CN108075628A true CN108075628A (en) | 2018-05-25 |
Family
ID=62160290
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| CN201611018755.XA Pending CN108075628A (en) | 2016-11-18 | 2016-11-18 | Electromagnetic compatibility wave filter and household electrical appliance |
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Citations (5)
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|---|---|---|---|---|
| JP2006352217A (en) * | 2005-06-13 | 2006-12-28 | Hitachi Ferrite Electronics Ltd | Low pass filter for dsl |
| CN201509352U (en) * | 2009-10-23 | 2010-06-16 | 山东华琪电器有限公司 | EMC circuit |
| CN203785025U (en) * | 2014-03-26 | 2014-08-20 | 中山市科立泰电器有限公司 | Wide-voltage constant-power electromagnetic oven |
| CN105517216A (en) * | 2014-09-25 | 2016-04-20 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating control device and electromagnetic heating device |
| CN206180833U (en) * | 2016-11-18 | 2017-05-17 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic compatibility wave filter and domestic appliance |
-
2016
- 2016-11-18 CN CN201611018755.XA patent/CN108075628A/en active Pending
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|---|---|---|---|---|
| JP2006352217A (en) * | 2005-06-13 | 2006-12-28 | Hitachi Ferrite Electronics Ltd | Low pass filter for dsl |
| CN201509352U (en) * | 2009-10-23 | 2010-06-16 | 山东华琪电器有限公司 | EMC circuit |
| CN203785025U (en) * | 2014-03-26 | 2014-08-20 | 中山市科立泰电器有限公司 | Wide-voltage constant-power electromagnetic oven |
| CN105517216A (en) * | 2014-09-25 | 2016-04-20 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating control device and electromagnetic heating device |
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Application publication date: 20180525 |