CN206211829U - Electromagnetic compatibility filter circuit, dc source and household electrical appliance - Google Patents
Electromagnetic compatibility filter circuit, dc source and household electrical appliance Download PDFInfo
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- CN206211829U CN206211829U CN201621237182.5U CN201621237182U CN206211829U CN 206211829 U CN206211829 U CN 206211829U CN 201621237182 U CN201621237182 U CN 201621237182U CN 206211829 U CN206211829 U CN 206211829U
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- inductor
- power interface
- filter circuit
- capacitor
- electromagnetic compatibility
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Abstract
The utility model is related to electromagnetic compatibility technical field of filtering, and in particular to electromagnetic compatibility filter circuit, dc source and household electrical appliance, and wherein the electromagnetic compatibility filter circuit is specifically included：AC power interface, AC power interface includes the first AC power interface for connecting AC power live wire and the second AC power interface for connecting AC power zero line；Capacitor, the two ends of capacitor are respectively connecting to the first AC power interface and the second AC power interface；Inductor；One end that capacitor is connected with the second AC power interface is connected to the first end of inductor, and load is adapted between the second end of inductor and the first AC power interface.Thus, simple and inexpensive circuit structure design is make use of, just can enables to have the electric equipment of the electromagnetic compatibility filter circuit to be tested by Electro Magnetic Compatibility (EMC), and effectively reduce production cost.
Description
Technical field
The utility model is related to electromagnetic compatibility technical field of filtering, in particular it relates to a kind of electromagnetic compatibility filter circuit, straight
Stream power supply and household electrical appliance.
Background technology
Electric equipment is connected to power network by power line, and the interference signal that electric equipment itself is produced can be by power line
Pass on power network, online other equipment is constituted and is endangered.Therefore, having formulated household electrical appliances EMC (Electro Magnetic
Compatibility Electro Magnetic Compatibilities) test regulation defines conduction test frequency range, and the in-band signal amplitude
Limit value, signal contamination will not be caused to ensure that electric equipment accesses power network to power network.
On the one hand, tested to pass through household electrical appliances EMC, household electrical appliances business men needs to set up EMC filter circuit for household appliances.It is existing
In technology Π types or multiple-order low-pass filter circuit, and the Π types or multiple-order low-pass filter are set up generally by power end
More than wave circuit by the way of the multistage filtering based on common mode inductance plus differential mode filter circuit composition so that household appliances
Can be tested by EMC；But, production cost can be caused to increase using multiple-order low-pass filter circuit, more reduce Power convert
Efficiency, while also increasing the complexity of circuit design in household appliances.
On the other hand, the revision of regulation is tested with the new household electrical appliances EMC of IEC 2016, by the frequency range of conduction test by
150kHz~30MHz is changed to 9KHz~30MHz.Obviously, for the EMC filtering designed by old household electrical appliances EMC test laws and regulations requirements
Circuit cannot meet the requirement that EMC tests regulation relative to the filter effect of household appliances.
It follows that a design is simple, with low cost and can cause that household appliances meet household electrical appliances EMC test defineds
Electromagnetic compatibility filter circuit is current industry technical barrier urgently to be resolved hurrily.
It should be noted that above technical problem is the present inventor being found during the utility model is put into practice.
The content of the invention
It is simple, with low cost and can be so that household appliances pass through that the purpose of the utility model one side is to provide a kind of design
The electromagnetic compatibility filter circuit of household electrical appliances EMC tests；The purpose of the utility model another aspect is to provide one kind comprising above-mentioned electromagnetism
The dc source of compatible filter circuit, the purpose of the utility model further aspect is to provide one kind and includes the filtering of above-mentioned electromagnetic compatibility
The household electrical appliance of circuit or above-mentioned dc source, to the technical problem at least solving to be illustrated in above-mentioned background technology.
To achieve these goals, on the one hand the utility model embodiment provides a kind of electromagnetic compatibility filter circuit, including：
AC power interface, above-mentioned AC power interface includes the first AC power for connecting AC power live wire
Interface and the second AC power interface for connecting AC power zero line；
Capacitor, the two ends of above-mentioned capacitor are respectively connecting to above-mentioned first AC power interface and above-mentioned second alternating current
Source interface；
Inductor；
One end that above-mentioned capacitor is connected with above-mentioned second AC power interface is connected to the first end of above-mentioned inductor,
Load is adapted between second end of above-mentioned inductor and above-mentioned first AC power interface, wherein above-mentioned load includes electrical equipment
Control circuit.
Preferably, above-mentioned capacitor is X-type safety capacitor.
Preferably, the size of the capacitance of above-mentioned capacitor is 0.1 μ F~10 μ F.
Preferably, the size of the capacitance of above-mentioned capacitor is 2 μ F~5.5 μ F.
Preferably, the size of the inductance value of above-mentioned inductor is 20 μ H~10mH.
Preferably, above-mentioned inductor comprising inductance coil and magnetic core, the size of the inductance value of above-mentioned inductor is 200-
400 μ H, and above-mentioned magnetic core is amorphous magnetic core.
Preferably, above-mentioned inductor comprising inductance coil and magnetic core, the size of the inductance value of above-mentioned inductor is 300-
450 μ H, and above-mentioned magnetic core is iron silicon magnetic core.
Preferably, above-mentioned inductance coil includes copper enamel-covered wire and/or copper facing aluminium enamel-covered wire.
Preferably, in above-mentioned electromagnetic compatibility filter circuit：
Wherein, f refers to the cut-off frequency of above-mentioned electromagnetic compatibility filter circuit, and L refers to the inductance value of above-mentioned inductor, and C refers to
For the capacitance of above-mentioned capacitor.
On the other hand the utility model embodiment provides a kind of dc source, and the dc source includes electromagnetism above-mentioned above
Compatible filter circuit, and rectification module, above-mentioned rectification module are input into FireWire port port and exchange input zero line port comprising exchange；
Above-mentioned second end of inductance is connected to the above-mentioned exchange input zero line side of above-mentioned rectification module in above-mentioned electromagnetic compatibility filter circuit
Mouthful；And the above-mentioned exchange input FireWire port port of above-mentioned rectification module be connected in above-mentioned electromagnetic compatibility filter circuit above-mentioned the
One AC power interface.
Preferably, above-mentioned rectification module is rectifier bridge.
The another aspect of the utility model embodiment provides a kind of household electrical appliance, including：Electromagnetic compatibility filtering above-mentioned above
Circuit；Above-mentioned second end of the above-mentioned inductor in above-mentioned electromagnetic compatibility filter circuit and above-mentioned electromagnetic compatibility filter circuit
In above-mentioned first AC power interface between electrical apparatus control circuit.
The another aspect of the utility model embodiment provides a kind of household electrical appliance, including：Above-mentioned dc source above；And
It is connected to the electrical apparatus control circuit of the output end of above-mentioned rectification module.
By above-mentioned technical proposal, based on the electromagnetic compatibility with low-frequency filter characteristicses that inductor and capacitor are constituted
Filter circuit, can effective attenuation or filter electric current working frequency range exceed cut-off frequency high-frequency noise, for decay low frequency
Conducted noise has a significant effect, and the electromagnetic compatibility filter circuit also has, and structure design is simple, increase electric energy heat turn
Efficiency is changed, the advantage of low cost is highly suitable for household electrical appliance, especially applies in small household appliances product.
Other features and advantages of the utility model will be described in detail in subsequent specific embodiment part.
Brief description of the drawings
Accompanying drawing is further understood to of the present utility model for providing, and constitutes a part for specification, and following
Specific embodiment be used to explain the utility model together, but do not constitute to limitation of the present utility model.In the accompanying drawings：
Fig. 1 is illustrated that the structural representation of the electromagnetic compatibility filter circuit of the embodiment of the utility model one；
Fig. 2 is illustrated that structure of the dc source comprising electromagnetic compatibility filter circuit shown in Fig. 1 under an embodiment is shown
It is intended to；
Fig. 3 is illustrated that block schematic illustration of the dc source under an embodiment shown in application drawing 2；
Fig. 4 is illustrated that structure of the household electrical appliance comprising electromagnetic compatibility filter circuit shown in Fig. 1 under an embodiment is shown
It is intended to；
Fig. 5 is illustrated that structural representation of the household electrical appliance comprising dc source shown in Fig. 2 under an embodiment.
Description of reference numerals
10th, 301 electromagnetic compatibility filter circuits 20,41 dc sources
30th, 40 household electrical appliance 302,42 electrical apparatus control circuits
ACL the first AC power interface the second AC power interfaces of ACN
L1Inductor C1Capacitor
AC rectifier bridges exchange end V+ rectifier bridge direct-flow positive poles end
V- rectifier bridge direct current negative pole ends
Specific embodiment
Specific embodiment of the present utility model is described in detail below in conjunction with accompanying drawing.It should be appreciated that herein
Described specific embodiment is merely to illustrate and explains the utility model, is not limited to the utility model.
Those skilled in the art of the present technique be appreciated that used in specification of the present utility model wording " including " refer to deposit
In features described above, integer, step, operation, element and/or component, but it is not excluded that in the presence of or add one or more other
Feature, integer, step, operation, element, component and/or combinations thereof.It should be understood that when we claim element be " connected " or
During " coupled " to another element, it can be directly connected or coupled to other elements, or can also there is intermediary element.This
Outward, " connection " used herein or " coupling " can include wireless connection or wireless coupling.Wording "and/or" bag used herein
Include one or more associated wholes or any cell of listing item and all combine.
The structural representation of the electromagnetic compatibility filter circuit of the embodiment of the utility model one is illustrated that referring to Fig. 1, wherein,
The electromagnetic compatibility filter circuit 10 includes：Power interface, power interface includes first of the live wire for connecting AC power
AC power interface ACL and the second AC power interface ACN for connecting AC power zero line；Capacitor C1, capacitor C1's
Two ends are respectively connecting to the first AC power interface ACL and the second AC power interface ACN, are hereby based on differential mode capacitor device C1
DM EMI can be suppressed；Inductor L1；Capacitor C1The one end being connected with the second AC power interface ACN is connected to inductor
L1First end, in inductor L1The second end and the first AC power interface ACL between for connect load so that electric
Magnetic compatibility filter circuit has LC low-frequency filter characteristicses.
In order that obtain the present embodiment to be easier to be understood by the public, following discloses should have low pass LC filtering characteristics electromagnetism simultaneous
The design philosophy of capacitor filter circuit：High-frequency conduction noise on power interface (including power line) can use differential mode and common-mode noise
Signal is described；Differential mode noise flows between two transfer wires, belongs to asymmetry interference；Common-mode noise spread out of wire with
Transmitted between ground, belong to symmetry interference, so needing to enter in terms of differential mode and common mode two for the LPF of power interface
Hand.Therefore, differential mode capacitor C is used in the present embodiment1To suppress DM EMI, and combine using inductance L1It is common mode choke, its
To be wound on a pair of coils on same magnetic core in the same direction, for common-mode interference current, the magnetic field of two coil generations is equidirectional
, common mode choke shows larger impedance, so as to play a part of the interference signal that decays, and for difference mode signal, two
The magnetic field cancellation that coil is produced, so not interfering with the power delivery function of circuit again.It is pointed out that the electromagnetic compatibility is filtered
A part for the technical essential of wave circuit is capacitor C1With inductor L1The residing position in the electromagnetic compatibility filter circuit
Put, the present embodiment should be limited inductor L1Positioned at C1Afterwards, can not be located at C1Before.
In some optional embodiments of the present embodiment, inductor L of the selection with specific inductance value1With with specific
The capacitor C of inductance value1So that the electromagnetic compatibility wave filter has outstanding low pass LC filtering characteristics, by the electromagnetism of circuit
Compatibility calibrates to aspiration level.Preferably, capacitor C1It is adapted to the safety electric capacity of the X-type from Large Copacity, capacitor C1's
Pressure voltage should exceed line voltage value, such as when this circuit to be accessed the utility grid of China, differential mode capacitor C1It is resistance to
Pressure value should exceed to obtain 220V；Inductor L1Inductance coil (not shown) can select copper enamel-covered wire and/or copper facing aluminium enamel-covered wire；
Inductor L1Magnetic core (not shown) be selected from one or more of：Ferrite, iron silicon magnetic core, magnetic powder core, amorphous magnetic core, by
This coordinates X-type safety electric capacity, can realize good filter effect.By the electromagnetic compatibility filter circuit used with LC
The design of LPF so that the electromagnetic compatibility filter circuit has the cut-off frequency corresponding with the LC LPFs,
To can be filtered out by the interference signal in the electric current of the electromagnetic compatibility filter circuit more than the cut-off frequency.
Knot of the dc source comprising electromagnetic compatibility filter circuit shown in Fig. 1 under an embodiment is illustrated that referring to Fig. 2
Structure schematic diagram, the dc source 20 includes power interface, and power interface includes first of the live wire for connecting AC power
AC power interface ACL and the second AC power interface ACN for connecting AC power zero line；Capacitor C1, capacitor C1's
Two ends are respectively connecting to the first AC power interface ACL and the second AC power interface ACN, are hereby based on differential mode capacitor device C1
DM EMI can be suppressed；Inductor L1；Capacitor C1The one end being connected with the second AC power interface ACN is connected to inductor
L1First end, in inductor L1The second end and the first AC power interface ACL between exchange input for connect rectifier bridge
End, the DC output end of the rectifier bridge is adapted to load, so that the dc source 20 has LC filtering characteristics；Need
Bright, the rectifier bridge in the present embodiment is only used as example, and the rectifier bridge can be replaced by other components, as long as energy
Enough realizing the rectification module of the functional effect of corresponding rectification should all belong in protection domain of the present utility model.With reference to Fig. 3,
The application of the dc source provided the present embodiment is further elaborated, can connecting circuit in the DC output end of rectifier bridge
Control circuit, the AC power can choose utility grid.
Knot of the household electrical appliance comprising electromagnetic compatibility filter circuit shown in Fig. 1 under an embodiment is illustrated that referring to Fig. 4
Structure schematic diagram, the household electrical appliance 30 include electromagnetic compatibility filter circuit 301 and electrical apparatus control circuit 302, on electromagnetic compatibility filter
The concrete structure of wave circuit 301 may refer to the above description, therefore not in this to go forth.The electromagnetic compatibility filter circuit is arranged on and leans on
At nearly power interface, and it is connected with electrical control circuit, can effectively controls the operating current frequency range of electrical control circuit under working condition, is protected
The electrical control circuit under working condition is hindered without interference with utility grid, the regulation requirement of EMC tests can have been met.
Structural representation of the household electrical appliance comprising dc source shown in Fig. 2 under an embodiment is illustrated that referring to Fig. 5,
The household electrical appliance 40 include dc source 41 and electrical apparatus control circuit 42, and the concrete structure on dc source 41 is referred to above
Description, therefore not in this to go forth.It is understood that electrical apparatus control circuit 302 can be connected in above-mentioned dc source 41
The DC output end (V+ and V- in specific corresponding diagram 2) of rectifier bridge.In order that obtain the household electrical appliance 40 can be by household electrical appliances EMC
Test, the present embodiment is down to EMC rules and regulations conduction test frequency ranges using electromagnetic compatibility filter circuit by power frequency is conducted
One value 2KHz of below lower limit 9KHz.It is using in electromagnetic compatibility filter circuit 101 on illustrating that it is realized
Cut-off frequency under LC low-frequency filter characteristicses, will be above the current attenuation of the cut-off frequency and filters, and the cut-off frequency should be by
Inductor L1Inductance value and capacitor C1Capacitance determined；In the present embodiment, on inductor L1With capacitor C1's
Type selecting and determination, should determine according to the required EMC standards for reaching；Correspondingly, on inductor L1With capacitor C1Choosing
Type can refer to it is described above, as inductor L1Inductance value span be 20 μ H~10mH, capacitor C1Capacitance take
When value scope is 0.1 μ F~10 μ F, can effective guarantee it is thus determined that the cut-off frequency of electromagnetic compatibility wave filter disclosure satisfy that EMC
The requirement of regulation.Determination method on above-mentioned inductance value and capacitance span can be：According to test data, surplus will
Ask and make the Insertion Loss curve of EMC wave filters, and then acquire amplitude fading, calculated according to the value after the frequency multiplication of amplitude fading/10
Go out the cut-off frequency of EMC wave filters, then the corresponding relation according to the cut-off frequency and capacitance and inductance value converts to determine
Span.
Because in filter circuit, the effect of capacitor is exactly to intercept low frequency by high frequency, and the capacitance of capacitor is bigger
Low frequency is less susceptible to pass through；In filtering, the capacitor of small capacitances amount is exactly to filter high frequency, such as electric capacity in the utility model
Capacitor of the scope in 0.1 μ F-10 μ F is measured, exactly for filtering high frequency, and use of being arranged in pairs or groups in filter circuit " logical direct current,
The inductor L of resistance exchange "1, preferably filter effect can be realized.More specifically, on inductor L1Inductance value and capacitor
C1Specific value may be referred to formula：Wherein f refers to cutting for above-mentioned electromagnetic compatibility filter circuit
Only frequency；It should be noted that in order to meet the requirement that current household electrical appliances EMC tests regulation, in allowing also for filter circuit
The factor that noise floats, should be set to EMC rules and regulations conduction test frequently by the cut-off frequency of the electromagnetic compatibility filter circuit
One value of below the lower limit 9KHz of section, the cut-off frequency of selected filter circuit is 2KHz in the present embodiment, thus, it is possible to
The frequency range of enough safeguard work electric currents can be effectively filtered out in the interference signal of more than 9KHz；It is understood that the present embodiment
In filter circuit cut-off frequency for 2KHz it is merely exemplary, cut-off frequency less than 9KHz filter circuit all should be category
In the protection domain that the utility model is covered.Based on the present embodiment, just with single order LC filter circuits, house is just enabled to
Electrical appliance meets the requirement of EMC regulations；Meanwhile, compared to multistage filter circuit or Π type filter circuits, in this embodiment scheme
Circuit design it is simple and can effectively reduce the additional production cost of household electrical appliance.
In the present embodiment, household electrical appliance 40 can be electromagnetic oven, because of the Electromagnetic Heating work of generally electromagnetic oven
When current work frequency range be 20KHz~40KHz, it is clear that such current work frequency range be cannot meet EMC test regulation
Requirement.But after electromagnetic compatibility circuit 10 or dc source 20 is employed, just can realize ensureing production cost
Enable that electromagnetic oven is tested by household electrical appliances EMC under conditions of control.It is understood that the household electrical appliance in the present embodiment should
Electromagnetic oven is not only shall be limited only to the extent, the household electrical appliance such as washing machine, air-conditioning can also be included.
Need to illustrate again herein, the specific type selecting of inductor, capacitor disclosed in the utility model, and
Thus filter circuit determined by type selecting, is a key factor for realizing utility model purpose of the present utility model.Can be with this
Understand, be that can not realize the utility model part if different from the utility model for the type selecting of inductor or capacitor
Utility model target.
Preferred embodiment of the present utility model is described in detail above in association with accompanying drawing, but, the utility model is not limited
Detail in above-mentioned implementation method, in range of the technology design of the present utility model, can be to skill of the present utility model
Art scheme carries out various simple variants, and these simple variants belong to protection domain of the present utility model.
It is further to note that each particular technique feature described in above-mentioned specific embodiment, in not lance
In the case of shield, can be combined by any suitable means in order to avoid unnecessary repetition, the utility model is to each
Possible combination is planted no longer separately to illustrate.
Additionally, can also be combined between a variety of implementation methods of the present utility model, as long as it is not disobeyed
Thought of the present utility model is carried on the back, it should equally be considered as content disclosed in the utility model.
Claims (13)
1. a kind of electromagnetic compatibility filter circuit, it is characterised in that including：
AC power interface, the AC power interface includes the first AC power interface for connecting AC power live wire
With the second AC power interface for connecting AC power zero line；
Capacitor, the two ends of the capacitor are respectively connecting to first AC power interface and second AC power connects
Mouthful；
Inductor；
One end that the capacitor is connected with second AC power interface is connected to the first end of the inductor, described
Load is adapted between second end of inductor and first AC power interface, wherein the load includes electrical equipment control
Circuit.
2. circuit according to claim 1, it is characterised in that：
The capacitor is X-type safety capacitor.
3. circuit according to claim 2, it is characterised in that：
The size of the capacitance of the capacitor is 0.1 μ F~10 μ F.
4. the circuit according to Claims 2 or 3, it is characterised in that：
The size of the capacitance of the capacitor is 2 μ F~5.5 μ F.
5. circuit according to claim 4, it is characterised in that：
The size of the inductance value of the inductor is 20 μ H~10mH.
6. circuit according to claim 5, the inductor includes inductance coil and magnetic core, it is characterised in that：
The size of the inductance value of the inductor is 200-400 μ H, and
The magnetic core is amorphous magnetic core.
7. circuit according to claim 5, the inductor includes inductance coil and magnetic core, it is characterised in that：
The size of the inductance value of the inductor is 300-450 μ H, and
The magnetic core is iron silicon magnetic core.
8. the circuit according to claim 6 or 7, it is characterised in that：
The inductance coil includes copper enamel-covered wire and/or copper facing aluminium enamel-covered wire.
9. circuit according to claim 5, it is characterised in that：
Wherein, f refers to the cut-off frequency of the electromagnetic compatibility filter circuit, and L refers to the inductance value of the inductor, and C refers to institute
State the capacitance of capacitor.
10. a kind of dc source, it is characterised in that the dc source includes the electricity according to any one of claim 1-9
Magnetic compatibility filter circuit, and
Rectification module, the rectification module is input into FireWire port port and exchanges input zero line port comprising exchange；
Second end of inductance is connected to the exchange input zero of the rectification module in the electromagnetic compatibility filter circuit
Line end mouthful；And
The exchange input FireWire port port of the rectification module is connected in the electromagnetic compatibility filter circuit described first
AC power interface.
11. dc sources according to claim 10, it is characterised in that the rectification module is rectifier bridge.
A kind of 12. household electrical appliance, it is characterised in that including：
Electromagnetic compatibility filter circuit described in claim any one of 1-9；
Second end of the inductor in the electromagnetic compatibility filter circuit and the electromagnetic compatibility filter circuit
In first AC power interface between electrical apparatus control circuit.
A kind of 13. household electrical appliance, it is characterised in that including：
Dc source described in claim 10 or 11；And
It is connected to the electrical apparatus control circuit of the output end of the rectification module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621237182.5U CN206211829U (en) | 2016-11-18 | 2016-11-18 | Electromagnetic compatibility filter circuit, dc source and household electrical appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621237182.5U CN206211829U (en) | 2016-11-18 | 2016-11-18 | Electromagnetic compatibility filter circuit, dc source and household electrical appliance |
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| Publication Number | Publication Date |
|---|---|
| CN206211829U true CN206211829U (en) | 2017-05-31 |
Family
ID=58749320
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621237182.5U Expired - Fee Related CN206211829U (en) | 2016-11-18 | 2016-11-18 | Electromagnetic compatibility filter circuit, dc source and household electrical appliance |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108075626A (en) * | 2016-11-18 | 2018-05-25 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic compatibility filter circuit, DC power supply and household electrical appliance |
-
2016
- 2016-11-18 CN CN201621237182.5U patent/CN206211829U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108075626A (en) * | 2016-11-18 | 2018-05-25 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic compatibility filter circuit, DC power supply and household electrical appliance |
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