CN108075642A - EMI suppression circuits, Switching Power Supply, DC power supply and household electrical appliance - Google Patents
EMI suppression circuits, Switching Power Supply, DC power supply and household electrical appliance Download PDFInfo
- Publication number
- CN108075642A CN108075642A CN201611016282.XA CN201611016282A CN108075642A CN 108075642 A CN108075642 A CN 108075642A CN 201611016282 A CN201611016282 A CN 201611016282A CN 108075642 A CN108075642 A CN 108075642A
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- China
- Prior art keywords
- power supply
- capacitance
- switching power
- suppression circuits
- emi suppression
- 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.)
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Classifications
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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
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
Abstract
The embodiment of the present invention provides a kind of EMI suppression circuits, Switching Power Supply, DC power supply and household electrical appliance for Switching Power Supply, belongs to electromagnetic interference and inhibits field.The Switching Power Supply is used to the alternating current from AC power being converted to direct current electricity output, and wherein the EMI suppression circuits include：Filter capacitor, the first end of filter capacitor are connected to ground terminal, and second end is connected to the output terminal of Switching Power Supply；First capacitance, the first end of the first capacitance are connected to the first end of filter capacitor, and second end is connected to the zero curve of AC power；And second capacitance, the first end of the second capacitance are connected to firewire, second end is connected to the second end of filter capacitor.Thereby, it is possible to provide a kind of scheme of effective control EMI ground connection, the EMI problems of Switching Power Supply can be effectively eliminated.
Description
Technical field
The present invention relates to electromagnetic interferences to inhibit field, and in particular, to a kind of EMI suppression circuits for Switching Power Supply,
Switching Power Supply, DC power supply and household electrical appliance.
Background technology
Due to linear power supply transfer efficiency it is low the defects of so that the higher Switching Power Supply of transfer efficiency has obtained numerous family expenses
The pro-gaze of electric appliance production firm and popularization and application.
The operation principle of Switching Power Supply is：Alternating current is directly made into DC current by Switching Power Supply in input terminal, and
Under the action of high-frequency oscillating circuits, with the break-make of switch controlled electric current, high-frequency pulse current is formed, then again in the side of inductance
It helps down, exports stable low-voltage dc power supply.Leading to common switching tube has transistor, silicon-controlled, magnetic switch etc..Switching tube works
When cut-off region, the disconnection of mechanical switch is equivalent to；When switching tube is operated in saturation region, mechanical switch is equivalent to
Closure.
But when Switching Power Supply is operated in cut-off and saturation region repeatedly, switchs and constantly disconnect closure, in PN junction
In constantly form di/dt and du/dt energy accumulatings, these transient energies have little time to guide, can in the form of an electromagnetic wave to sky
Between radiate, formed tens million to hundreds of million wideband radiation electromagnetic interference so that current household appliances have jointly
Electromagnetic interference (EMI) problem.
In the prior art in order to solve the problems, such as that Conducted EMI is exceeded, it will usually be set using close to power port one side
Common mode interference signal wave filter, to inhibit to common-mode signal.When the electric power of household appliances is bigger, this can be caused
Kind EMI solutions usually have the shortcomings that following apparent：
Firstth, common mode inhibition device head is bigger, it is necessary to occupy circuit board larger space, is unfavorable for the design of circuit board
And layout；
Secondth, the cost of common mode inhibition device is higher；
3rd, common mode inhibition device heating amount is big, causes the reduction of complete machine thermal conversion efficiency.
A kind of cheap, design is simply as a result, occupancy is small, thermal losses is low and can effectively inhibit Switching Power Supply
The EMI suppression circuits of EMI problems are current industry technical barriers urgently to be resolved hurrily.
It is found it is pointed out that more than technical problem is the present inventor during the present invention is put into practice
's.
The content of the invention
The purpose of one side of the embodiment of the present invention be to provide it is a kind of it is cheap, design is simple, occupies small, thermal losses
The EMI suppression circuits for Switching Power Supply that are low and can effectively inhibiting switch power supply EMI problem；The mesh of another aspect of the present invention
Be to provide a kind of Switching Power Supply comprising above-mentioned EMI suppression circuits, a kind of DC power supply and one for including above-mentioned Switching Power Supply
The household electrical appliance of above-mentioned DC power supply kind are included, the technical issues of at least to solve to illustrate in background technology.
To achieve these goals, on the one hand the embodiment of the present invention provides a kind of EMI suppression circuits for Switching Power Supply,
The Switching Power Supply is used to the alternating current from AC power being converted to direct current electricity output, which is characterized in that the EMI suppression circuits
Including：
Filter capacitor, the first end of above-mentioned filter capacitor are connected to ground terminal, and second end is connected to above-mentioned Switching Power Supply
Output terminal；
First capacitance, the first end of above-mentioned first capacitance are connected to the above-mentioned first end of above-mentioned filter capacitor, and second end connects
It is connected to the zero curve of above-mentioned AC power；And
Second capacitance, the first end of above-mentioned second capacitance are connected to above-mentioned firewire, and second end is connected to above-mentioned filter capacitor
Above-mentioned second end.
Preferably, above-mentioned first capacitance and/or above-mentioned second capacitance are ceramic disc capacitor.
Preferably, the pressure voltage of above-mentioned first capacitance and/or above-mentioned second capacitance is 220-3000VAC.
Preferably, the capacitance size of above-mentioned first capacitance and/or above-mentioned second capacitance is 101-104.
On the other hand the embodiment of the present invention provides a kind of Switching Power Supply, including：
AC-DC converting units, for the alternating current from AC power to be converted to direct current electricity output；And
EMI suppression circuits described above.
Preferably, which also includes：First and second rectifier diode, first and second rectifier diode
Anode is respectively connected to the firewire and zero curve of alternating voltage, and cathode connects the input terminal of above-mentioned AC-DC converting units.
Preferably, above-mentioned AC-DC converting units are exported comprising one or more, wherein each output is equipped with institute above
The EMI suppression circuits stated.
The another aspect of the embodiment of the present invention provides a kind of DC power supply, including：
Switch mentioned above power supply, for the High Level AC Voltage of AC power to be converted to low-voltage direct electricity output；With
And
Rectification module, for the High Level AC Voltage of above-mentioned AC power to be converted to high voltage direct current electricity output.
Preferably, above-mentioned rectification module is rectifier bridge.
Further aspect of the embodiment of the present invention provides a kind of household electrical appliance, including DC power supply described above.
Preferably, which is the household electrical appliances such as electromagnetic oven, electric cooker.
In the EMI suppression circuits that the invention described above technical solution is provided, filtered by being bridged in switched power output
Capacitance, and distinguish flying capcitor in the both sides of the filter capacitor, thus a kind of control EMI ground connection can be effectively provided using above-mentioned
Scheme can effectively eliminate the EMI problems of Switching Power Supply；Common utilization EMI filter circuit is to solve in compared with the prior art
The certainly EMI problems of Switching Power Supply, the EMI suppression circuits of the earthing mode provided by the present invention can more thoroughly eliminate electricity
The problem of magnetic disturbance；And the electronic component employed in the EMI suppression circuits is simple, of low cost, is advantageously implemented this
EMI suppression circuits are widelyd popularize, and are particluarly suitable for promoting and applying in all household electrical appliance.
The other feature and advantage of the embodiment of the present invention will be described in detail in subsequent specific embodiment part.
Description of the drawings
Attached drawing is that the embodiment of the present invention is further understood for providing, and a part for constitution instruction, under
The specific embodiment in face is together for explaining the embodiment of the present invention, but do not form the limitation to the embodiment of the present invention.Attached
In figure：
Fig. 1 is illustrated that the structure diagram of the EMI suppression circuits for Switching Power Supply of one embodiment of the invention；
Fig. 2 is illustrated that the structure diagram of the Switching Power Supply of one embodiment of the invention；
Fig. 3 is illustrated that the structure diagram of the DC power supply of one embodiment of the invention；
Fig. 4 is illustrated that when not including the EMI suppression circuits in the embodiment of the present invention in Switching Power Supply circuit, for opening
The EMI test results of powered-down resource loop；
Fig. 5 is illustrated that when including the EMI suppression circuits in the embodiment of the present invention in Switching Power Supply circuit, for switch
The EMI test results of electric power loop.
Reference sign
ACL AC power firewire ACN AC power zero curves
10EMI filter circuits C1、C2Capacitance
C3Filter capacitor VOSwitched power output
20 Switching Power Supply D1、D2Rectifier diode
AC rectifier bridge input terminal V+, V- rectification bridge output ends
30 DC power supply of GND ground terminals
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 EMI suppression circuits for Switching Power Supply of one embodiment of the invention is illustrated that referring to Fig. 1,
As can be seen from the figure the firewire and zero curve of AC power are connected to using the Switching Power Supply of the EMI suppression circuits, can be incited somebody to action
The alternating current of AC power output is converted to direct current, on the 10 more specific structure of EMI suppression circuits, as shown in Figure 1, bag
Contain：Filter capacitor C3, capacitance C1With capacitance C2；Filter capacitor C3One end be connected to ground terminal GND, filter capacitor C3It is another
End is connected to the output terminal of Switching Power Supply；Capacitance C1One end be connected to filter capacitor C3Connect one end of ground terminal GND side, electricity
Hold C1The other end be connected to AC power zero curve ACN；And capacitance C2One end be connected to AC power firewire ACL, the other end
It is connected to filter capacitor C3One end of the output terminal of connecting valve power supply.It is understood that electronics in the EMI suppression circuits 10
The connection of component and AC power firewire ACL or zero curve ACN should be indirectly connected with, and more specifically the electronic component can be
Based on realizing the company with AC power firewire ACL or zero curve ACN for being connected to the power interface of firewire ACL or zero curve ACN
It connects.In the present embodiment, it is possible to using by C1、C2、C3With ground terminal GND effectively by the interference signal of Switching Power Supply incoming end with
The mode of ground connection is filtered out, and thus eliminates Switching Power Supply generated powerful electromagnetic interference signal during the work time, especially
It is 30MHz-230MHz that it, which can be eliminated using the reluctant band limits of filtering EMI suppression circuits of the prior art,
Interference signal.In some optional embodiments of the invention, the carrier of above-mentioned EMI suppression circuits is PCB circuit board, and the PCB is electric
Road plate is single sided board or multi-layer board, and when the carrier uses multi-layer board, the ground terminal in the present embodiment should individually define Horizon
Face, when the carrier uses lamina, the ground terminal in the present embodiment should schedule out special earth-return；It is dry thus, it is possible to realize
The rapid grounding of signal is disturbed, improves the elimination efficiency of interference signal.
The type selecting parameter of each component in the EMI suppression circuits 10 will be continued to disclose below：Capacitance C1, capacitance C2For resistance to height
Voltage capacitance is preferably ceramic disc capacitor, should require capacitance C1And C2Pressure voltage at least can be more than AC power voltage value；When
When circuit 10 is applied in household appliances, the pressure voltage of capacitance should be set to 220-3000VAC.Capacitance C1Capacitance C2Electricity
Amount of capacity is 101-104, it is to be understood that the method for expressing of the capacitance should be it is well-known to those skilled in the art,
Capacitance size 101 means that 10 multiply 10 first power PF, and capacitance size 104 represents that 10 multiply 10 biquadratic PF；Thus, it is possible to
Enough ensure that Switching Power Supply can work normally, without being burned.Filter capacitor C in the embodiment of the present invention3Model and capacitance
Amount does not limit herein, because connecting filter capacitor C by the output terminal in Switching Power Supply in the embodiment of the present invention3, realize dry
Disturb the coupling grounding of signal.
In order to prove that the EMI suppression circuits that the embodiment of the present invention is provided are directed to electromagnetic interference with good inhibition effect
Fruit, inventor employ control experiment also directed to the embodiment of the present invention, and the wherein reference object in control experiment is：Not comprising having
The Switching Power Supply circuit for the EMI suppression circuits that the embodiment of the present invention is provided；Experimental subjects is：With reference object close to identical
Switching Power Supply circuit differs only in experimental subjects and employs the EMI suppression circuits 10 that the embodiment of the present invention is provided.Fig. 4 and
The EMI supplemental characteristics that Fig. 5 was represented respectively is reference object and experimental subjects is exported, by correction data, with reference to right
The super normal EMI indexs of EMI parameters of elephant are up to 16dB, and the EMI parameters of experimental subjects also leave compared to normal EMI indexs
The surplus of 3dB.Therefore can intuitively determine very much：The EMI suppression circuits that the embodiment of the present invention is provided significantly can effectively press down
The EMI problems in Switching Power Supply circuit processed.
The Switching Power Supply being illustrated that referring to Fig. 2 under one embodiment of the invention, the Switching Power Supply 20 include：AC-DC is converted
Unit, C1、C2And C3；Filter capacitor C3One end be connected to ground terminal GND, filter capacitor C3The other end be connected to AC-DC turn
Change the output terminal of unit；Capacitance C1One end be connected to filter capacitor C3Connect one end of ground terminal GND side, capacitance C1It is another
End is connected to AC power zero curve ACN；And capacitance C2One end be connected to AC power firewire ACL, the other end is connected to filter
Ripple capacitance C3Connect one end of the output terminal of AC-DC converting units；Wherein the AC-DC converting units include AC-DC chips, with
Alternating current from AC power is converted into direct current electricity output VO, the VOGenerally low pressure out-put supply is to connect with Switching Power Supply
The low-voltage control circuit (not shown) power supply connect；It should be noted that as low voltage control load circuit and VODuring connection, capacitor
C3Loop is formed with load circuit so that in C3Upper end and lower end all have noise, although C3Here it is filter circuit, but
It is the presence because the loop, causes C3There is noise at both ends up and down, and noise intensity differs under normal circumstances, is easy to
C3Place forms EMI radiation source again；Therefore through this embodiment in C3Both ends capacitance C is set respectively1With capacitance C2So that C3Both ends
Noise rapidly ground connection and eliminate EMI noise.In some alternative embodiments of the present invention, which also includes first
Rectification diode D1With the second rectification diode D2, rectifier diode D1、D2Anode be connected to AC power firewire ACL, should
Rectifier diode D1、D2Cathode be connected to AC power zero curve ACN, be achieved in input current for AC-DC converting units
Rectification, and can ensure the voltage V that AC-DC converting units are exportedOQuality and transfer efficiency.Some in the present invention are optional
Embodiment in, when above-mentioned low-voltage control circuit need AC-DC converting units have multiplex operation export (not shown) when, correspondingly
EMI suppression circuits 10 are fitted with for each output of AC-DC converting units, from there through by the electromagnetism in each branch
Interference signal is filtered out, and can more effectively reduce the electromagnetic interference (EMI) emissions in Switching Power Supply circuit.
The structure diagram of the DC power supply of further embodiment of this invention is illustrated that referring to Fig. 3, which wraps
Containing switching power supply parts, the switching power supply parts are defeated for the High Level AC Voltage of AC power to be converted to low-voltage DC
Go out, the concrete structure on the switching power supply parts is referred to foregoing embodiments, therefore not in this to go forth, the DC power supply
Also include rectifier bridge, the output terminal V+ and V- of the rectifier bridge are used to export high voltage direct current electricity output so that high-voltage load works.
It is thus achieved that by low voltage control end high-voltage load circuit being controlled to work, generated electricity when reducing low-pressure end control work
Magnetic disturbance.It should be noted that the rectifier bridge in the embodiment of the present invention can also be by other rectification modules with rectification function
It is replaced, all should be to belong to the protection domain that the present invention is covered.
In an alternative embodiment of the invention, a kind of household electrical appliance are also provided, which includes DC power supply.On straight
The structure in galvanic electricity source is referred to above-described embodiment, therefore not in this to go forth.By being equipped with the DC power supply for household electrical appliance,
The electromagnetic interference (EMI) emissions of household electrical appliance can effectively be reduced.More specifically, the household electrical appliance can be electromagnetic oven or other household electrical appliances
Product, thus, it is possible to reduce the electromagnetic interference (EMI) emissions of household appliances.
The optional embodiment of example of the present invention, still, the embodiment of the present invention and unlimited are described in detail above in association with attached drawing
Detail in the above embodiment, can be to the embodiment of the present invention in the range of the technology design of the embodiment of the present invention
Technical solution carry out a variety of simple variants, these simple variants belong to the protection domain of the embodiment 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, it can be combined by any suitable means.In order to avoid unnecessary repetition, the embodiment of the present invention pair
Various combinations of possible ways no longer separately illustrate.
It will be appreciated by those skilled in the art that it is that can pass through to implement the method for the above embodiments
Program instructs relevant hardware to complete, which uses including some instructions so that one in a storage medium
A (can be microcontroller, chip etc.) or processor (processor) perform the whole of each embodiment the method for the application
Or part steps.And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only
Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc. are various can store journey
The medium of sequence code.
In addition, it can also be combined between a variety of embodiments of the embodiment of the present invention, as long as it is not
The thought of the embodiment of the present invention is run counter to, should equally be considered as disclosure of that of the embodiment of the present invention.
Claims (11)
1. a kind of EMI suppression circuits for Switching Power Supply, which is used to convert from the alternating current of AC power
For direct current electricity output, which is characterized in that the EMI suppression circuits include：
Filter capacitor, the first end of the filter capacitor are connected to ground terminal, and second end is connected to the output of the Switching Power Supply
End；
First capacitance, the first end of first capacitance are connected to the first end of the filter capacitor, and second end is connected to
The zero curve of the AC power；And
Second capacitance, the first end of second capacitance are connected to the firewire, and second end is connected to the institute of the filter capacitor
State second end.
2. EMI suppression circuits according to claim 1, it is characterised in that：
First capacitance and/or second capacitance are ceramic disc capacitor.
3. EMI suppression circuits according to claim 1 or 2, it is characterised in that：
The pressure voltage of first capacitance and/or second capacitance is 220-3000VAC.
4. EMI suppression circuits according to claim 1 or 2, it is characterised in that：
The capacitance size of first capacitance and/or second capacitance is 101-104.
5. a kind of Switching Power Supply, which is characterized in that including：
AC-DC converting units, for the alternating current from AC power to be converted to direct current electricity output；And
Claim 1-4 any one of them EMI suppression circuits.
6. Switching Power Supply according to claim 5, which is characterized in that the Switching Power Supply also includes：
First and second rectifier diode, the anode of first and second rectifier diode are respectively connected to the firewire of alternating voltage
And zero curve, cathode connect the input terminal of the AC-DC converting units.
7. Switching Power Supply according to claim 5, which is characterized in that the AC-DC converting units include one or more
Output, wherein each output is equipped with according to claim 1-4 any one of them EMI suppression circuits.
8. a kind of DC power supply, which is characterized in that including：
Claim 5-7 any one of them Switching Power Supplies, for the High Level AC Voltage of AC power to be converted to low-voltage direct
Electricity output；And
Rectification module, for the High Level AC Voltage of the AC power to be converted to high voltage direct current electricity output.
9. DC power supply according to claim 8, it is characterised in that：
The rectification module is rectifier bridge.
10. a kind of household electrical appliance, which is characterized in that including DC power supply according to claim 8 or claim 9.
11. household electrical appliance according to claim 10, which is characterized in that the household electrical appliance are the families such as electromagnetic oven, electric cooker
Electricity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611016282.XA CN108075642B (en) | 2016-11-18 | 2016-11-18 | EMI suppression circuit, switching power supply, direct current power supply and household appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611016282.XA CN108075642B (en) | 2016-11-18 | 2016-11-18 | EMI suppression circuit, switching power supply, direct current power supply and household appliance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108075642A true CN108075642A (en) | 2018-05-25 |
| CN108075642B CN108075642B (en) | 2020-09-15 |
Family
ID=62160543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611016282.XA Active CN108075642B (en) | 2016-11-18 | 2016-11-18 | EMI suppression circuit, switching power supply, direct current power supply and household appliance |
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| Country | Link |
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| CN (1) | CN108075642B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112532085A (en) * | 2020-11-24 | 2021-03-19 | 中捷通信有限公司 | Power supply circuit and power adapter |
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| CN105047385A (en) * | 2015-08-17 | 2015-11-11 | 江苏科谷电子有限公司 | High-frequency transformer and electronic magnetic interference (EMI) suppression circuit including same |
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| CN201467002U (en) * | 2009-05-22 | 2010-05-12 | 王中美 | Power supply energy-saving circuit for household appliances and office equipment |
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| CN112532085A (en) * | 2020-11-24 | 2021-03-19 | 中捷通信有限公司 | Power supply circuit and power adapter |
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| Publication number | Publication date |
|---|---|
| CN108075642B (en) | 2020-09-15 |
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