CN206442291U - EMI suppression circuits, Switching Power Supply, dc source and household electrical appliance - Google Patents
EMI suppression circuits, Switching Power Supply, dc source and household electrical appliance Download PDFInfo
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- CN206442291U CN206442291U CN201621237027.3U CN201621237027U CN206442291U CN 206442291 U CN206442291 U CN 206442291U CN 201621237027 U CN201621237027 U CN 201621237027U CN 206442291 U CN206442291 U CN 206442291U
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- power supply
- switching power
- electric capacity
- suppression circuits
- emi suppression
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Abstract
The utility model embodiment provides a kind of EMI suppression circuits, Switching Power Supply, dc source and household electrical appliance for Switching Power Supply, belongs to electromagnetic interference and suppresses field.The Switching Power Supply is used to the alternating current from AC power being converted to direct current electricity output, and the carrier of the EMI suppression circuits is circuit board, and the wherein EMI suppression circuits include：Filter capacitor, the first end of filter capacitor is connected to earth terminal, and the second end is connected to the output end of Switching Power Supply；First electric capacity, the first end of the first electric capacity is connected between the first end of filter capacitor and earth terminal, and the second end is connected to the live wire of AC power；And second electric capacity, the first end of the second electric capacity is connected to live wire, and the second end is connected to the second end of filter capacitor.Thereby, it is possible to provide a kind of effectively control EMI grounding schemes, the EMI problems of Switching Power Supply can be effectively eliminated.
Description
Technical field
The utility model is related to Electromagnetic Interference Suppressing Techniques field, in particular it relates to which a kind of EMI for Switching Power Supply presses down
Circuit processed, Switching Power Supply, dc source and household electrical appliance.
Background technology
Due to the low defect of linear power supply conversion efficiency so that the higher Switching Power Supply of conversion efficiency has obtained numerous family expenses
The pro-gaze of electrical equipment 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, and
In the presence 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
Help down, export stable low-voltage dc power supply.Switching tube generally has transistor, controllable silicon, magnetic switch etc..Switching tube works
When cut-off region, equivalent to the disconnection of mechanical switch；When switching tube is operated in saturation region, equivalent to mechanical switch
Closure.
But when Switching Power Supply is operated in cut-off and saturation region repeatedly, switch constantly disconnects 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 problem of Conducted EMI is exceeded, it will usually set using close to power port side
Common mode interference signal wave filter, to suppress to common-mode signal.When household appliances electric power than it is larger when, this can be caused
Planting EMI solutions generally has following obvious shortcoming：
Firstth, common mode inhibition device head is unfavorable for the design of circuit board than larger, it is necessary to occupy circuit board larger space
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.
Thus, a kind of cheap, design is simple, take small volume, thermal losses is low and can effectively suppress Switching Power Supply
The EMI suppression circuits of EMI problems are current industry technical barriers urgently to be resolved hurrily.
It is pointed out that above technical problem is inventor of the present utility model during the utility model is put into practice
It was found that.
The content of the invention
The purpose of the utility model embodiment one side is to provide a kind of simple cheap, design, occupancy small volume, heat
The loss EMI suppression circuits for Switching Power Supply that are low and can effectively suppressing switch power supply EMI problem；The utility model is another
The purpose of aspect is to provide a kind of Switching Power Supply comprising above-mentioned EMI suppression circuits, a kind of direct current for including above-mentioned Switching Power Supply
Power supply and a kind of household electrical appliance for including above-mentioned dc source, at least to solve the technical problem illustrated in background technology.
To achieve these goals, on the one hand the utility model embodiment provides a kind of EMI for Switching Power Supply and suppresses
Circuit, the Switching Power Supply is used to the alternating current from AC power being converted to direct current electricity output, the carrier of the EMI suppression circuits
For circuit board, the EMI suppression circuits include：
Filter capacitor, the first end of above-mentioned filter capacitor is connected to earth terminal, and the second end is connected to above-mentioned Switching Power Supply
Output end；
First electric capacity, the first end of above-mentioned first electric capacity is connected to the above-mentioned first end of above-mentioned filter capacitor, and the second end connects
It is connected to the live wire of above-mentioned AC power；And
Second electric capacity, the first end of above-mentioned second electric capacity is connected to above-mentioned live wire, and the second end is connected to above-mentioned filter capacitor
Above-mentioned second end.
Preferably, above-mentioned first electric capacity and/or above-mentioned second electric capacity are ceramic disc capacitor.
Preferably, the pressure voltage of above-mentioned first electric capacity and/or above-mentioned second electric capacity is 220-3000VAC.
Preferably, the capacitance size of above-mentioned first electric capacity and/or above-mentioned second electric capacity is 101-104.
On the other hand the utility model embodiment provides a kind of Switching Power Supply, including：
AC-DC converting units, for the alternating current from AC power to be converted into direct current electricity output；And
EMI suppression circuits described above.
Preferably, the Switching Power Supply is also included：First and second commutation diode, first and second commutation diode
Positive pole is respectively connecting to the live wire and zero line of alternating voltage, and negative pole connects the input of above-mentioned AC-DC converting units.
Preferably, above-mentioned AC-DC converting units are exported comprising one or more, and each of which output is equipped with institute above
The EMI suppression circuits stated.
The another aspect of the utility model embodiment provides a kind of dc source, including：
Switch mentioned above power supply, for the High Level AC Voltage of AC power to be converted into low-voltage direct electricity output；With
And
Rectification module, for the High Level AC Voltage of above-mentioned AC power to be converted into HVDC electricity output.
Preferably, above-mentioned rectification module is rectifier bridge.
The utility model embodiment further aspect provides a kind of household electrical appliance, including dc source described above.
Preferably, the household electrical appliance are the household electrical appliances such as electromagnetic oven, electric cooker.
The EMI suppression circuits provided in above-mentioned technical solutions of the utility model, by being bridged in switched power output
Filter capacitor, and distinguish flying capcitor in the both sides of the filter capacitor, thus it can effectively provide a kind of control EMI using above-mentioned
Grounding scheme, can effectively eliminate the EMI problems of Switching Power Supply；Compared to utilization EMI filter circuit common in the art
To solve the problems, such as the EMI of Switching Power Supply, the EMI suppression circuits of the earthing mode provided by the utility model can be more thorough
The problem of ground eliminates electromagnetic interference；And the electronic component employed in the EMI suppression circuits is simple, with low cost, favorably
In realizing wideling popularize for the EMI suppression circuits, it is particluarly suitable for popularization and application in all household electrical appliance.
The further feature and advantage of the utility model embodiment will give specifically in subsequent embodiment part
It is bright.
Brief description of the drawings
Accompanying drawing is that the utility model embodiment is further understood for providing, and constitutes a part for specification,
It is used to explain the utility model embodiment together with following embodiment, but does not constitute to the utility model embodiment
Limitation.In the accompanying drawings：
Fig. 1 is illustrated that the structural representation of the EMI suppression circuits for Switching Power Supply of the embodiment of the utility model one；
Fig. 2 is illustrated that the structural representation of the Switching Power Supply of the embodiment of the utility model one；
Fig. 3 is illustrated that the structural representation of the dc source of the embodiment of the utility model one；
Fig. 4 be illustrated that when in Switching Power Supply loop do not include the utility model embodiment in EMI suppression circuits when, pin
The EMI test results of split powered-down resource loop；
Fig. 5 be illustrated that when in Switching Power Supply loop include the utility model embodiment in EMI suppression circuits when, for
The EMI test results in Switching Power Supply loop.
Description of reference numerals
ACL AC power live wire ACN AC power zero lines
10 EMI filter circuit C1、C2Electric capacity
C3Filter capacitor VOSwitched power output
20 Switching Power Supply D1、D2Commutation diode
AC rectifier bridge input V+, V- rectification bridge output ends
The dc source of GND earth terminals 30
Embodiment
Embodiment of the present utility model is described in detail below in conjunction with accompanying drawing.It should be appreciated that herein
Described embodiment is merely to illustrate and explained the utility model, is not limited to the utility model.
Those skilled in the art of the present technique are appreciated that the wording " comprising " used in specification of the present utility model refers 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 it is one or more other
Feature, integer, step, operation, element, component and/or their group.It should be understood that when we claim element to be " connected " or " coupling
Connect " arrive another element when, it can be directly connected or coupled to other elements, or can also have intermediary element.In addition, this
In " connection " or " coupling " that uses wireless connection or wireless coupling can be included.Wording "and/or" used herein includes one
Individual or more the associated whole or any cell for listing item and all combinations.
It is illustrated that the structure of the EMI suppression circuits for Switching Power Supply of the embodiment of the utility model one is shown referring to Fig. 1
It is intended to, the live wire and zero line of AC power, its energy is as can be seen from the figure connected to using the Switching Power Supply of the EMI suppression circuits
Enough alternating currents for exporting AC power are converted to direct current, on the more specifically structure of EMI suppression circuits 10, such as Fig. 1 institutes
Show, include：Filter capacitor C3, electric capacity C1With electric capacity C2；Filter capacitor C3One end be connected to earth terminal GND；Filter capacitor C3
The other end be connected to the output end of Switching Power Supply；Electric capacity C1One end be connected to filter capacitor C3Connect the one of earth terminal GND side
End, electric capacity C1The other end be connected to AC power live wire ACL；And electric capacity C2One end be connected to AC power live wire ACL,
The other end is connected to filter capacitor C3One end of the output end of connecting valve power supply.It is understood that the EMI suppression circuits 10
Middle electronic component and AC power live wire ACL connection should be indirectly connected with, and more specifically the electronic component can be base
In realizing the connection with AC power live wire ACL for being connected to live wire ACL power interface.In the present embodiment, it is possible to
Using by C1、C2、C3Effectively the interference signal of Switching Power Supply incoming end is filtered out in the way of being grounded with earth terminal GND, by
This eliminates Switching Power Supply produced powerful electromagnetic interference signal in the course of the work, can especially eliminate and utilize existing skill
The interference signal that the reluctant band limits of filtering EMI suppression circuits in art is 30MHz-230MHz.In the utility model
In some optional embodiments, the carrier of above-mentioned EMI suppression circuits is PCB, and the PCB is single sided board or many
Laminate, when the carrier uses multi-layer sheet, the earth terminal in the present embodiment should individually define ground level, when the carrier uses individual layer
During plate, the earth terminal in the present embodiment should schedule out special earth-return；Rapid grounding thus, it is possible to realize interference signal, is carried
The elimination efficiency of high interference signal.
Continuation is disclosed to the type selecting parameter of each component in the EMI suppression circuits 10 below：Electric capacity C1, electric capacity C2For resistance to height
Voltage capacitance, preferably ceramic disc capacitor, should require electric capacity C1And C2Pressure voltage at least can exceed AC power magnitude of voltage；When
When circuit 10 is applied in household appliances, the pressure voltage of electric capacity should be set to 220-3000VAC.Electric capacity C1Electric capacity 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
Switching Power Supply energy normal work is enough ensured, without being burned.Filter capacitor C in the utility model embodiment3Model and
Capacitance is not limited herein, because connecting filter capacitor C by the output end in Switching Power Supply in the utility model embodiment3,
Realize the coupling grounding of interference signal.
There is good suppression in order to prove that EMI suppression circuits that the utility model embodiment is provided are directed to electromagnetic interference
Effect processed, inventor employs control experiment also directed to the utility model embodiment, and the wherein reference object in control experiment is：
Not comprising the Switching Power Supply loop for having EMI suppression circuits that the utility model embodiment provided；Experimental subjects is：With with reference to right
The EMI that the utility model embodiment is provided is employed as close to identical Switching Power Supply loop, differing only in experimental subjects
Suppression circuit 10.What Fig. 4 and Fig. 5 were represented respectively is the EMI supplemental characteristics that reference object and experimental subjects are exported, and passes through contrast
Data understand that the super normal EMI indexs of EMI parameters of reference object are up to 16dB, and the EMI parameters of experimental subjects are compared to normal
EMI indexs also leave 3dB surplus.Therefore can intuitively it determine very much：The EMI suppression circuits that the utility model embodiment is provided
It significantly can effectively suppress the EMI problems in Switching Power Supply loop.
The Switching Power Supply under the embodiment of the utility model one is illustrated that referring to Fig. 2, the Switching Power Supply 20 includes：AC-DC
Converting unit, C1、C2And C3, filter capacitor C3One end be connected to earth terminal GND；Filter capacitor C3The other end be connected to AC-
The output end of DC converting units；Electric capacity C1One end be connected to filter capacitor C3Connect one end of earth terminal GND side, electric capacity C1's
The other end is connected to AC power live wire ACL；And electric capacity C2One end be connected to AC power live wire ACL, other end connection
To filter capacitor C3Connect one end of the output end of AC-DC converting units；Wherein the AC-DC converting units include AC-DC cores
Piece, direct current electricity output V is converted to by the alternating current from AC powerO, the VOGenerally low pressure out-put supply, is and switchs
The low-voltage control circuit (not shown) of power supply connection is powered；It should be noted that as low voltage control load circuit and VODuring connection,
Capacitor C3With load circuit formation loop so that in C3Upper end and lower end all have noise, although C3It is filtered electrical here
Road, but because the presence of the loop, causes C3There is noise at two ends up and down, and noise intensity is generally, pole
Easily in C3Place forms EMI radiation source again；Therefore by the present embodiment in C3Two ends electric capacity C is set respectively1With electric capacity C2, make
Obtain C3The noise at two ends is grounded rapidly and eliminates EMI noise.In some alternative embodiments of the present utility model, the Switching Power Supply
20 also include the first rectification diode D1With the second rectification diode D2, commutation diode D1、D2Positive pole be connected to alternating current
Source live wire ACL, commutation diode D1、D2Negative pole be connected to AC power zero line ACN, be achieved in as AC-DC converting units
Input current rectification, and the voltage V that AC-DC converting units are exported can be ensuredOQuality and conversion efficiency.In this reality
With in some new optional embodiments, when above-mentioned low-voltage control circuit needs AC-DC converting units to have multiplex operation output
During (not shown), EMI suppression circuits 10 correspondingly are fitted with for each output of AC-DC converting units, from there through
Electromagnetic interference signal in each branch road is filtered out, the electromagnetic interference spoke in Switching Power Supply loop can be more effectively reduced
Penetrate.
The structural representation of the dc source of the another embodiment of the utility model, the dc source are illustrated that referring to Fig. 3
30 include switching power supply parts, and the switching power supply parts are used to the High Level AC Voltage of AC power being converted to low-voltage DC
Output, the concrete structure on the switching power supply parts is referred to foregoing embodiments, therefore not in this to go forth, the direct current
Source also includes rectifier bridge, and the output end V+ and V- of the rectifier bridge are used to export HVDC electricity output for high-voltage load work
Make.Thus achieve by controlling high-voltage load circuit to work at low voltage control end, it is produced during reduction low-pressure end control work
Electromagnetic interference.It should be noted that the rectifier bridge in the utility model embodiment can also have rectification function by other
Rectification module is replaced, and all should be to belong to the protection domain that the utility model is covered.
In another embodiment of the utility model, a kind of household electrical appliance are also provided, the household electrical appliance include dc source.Close
Above-described embodiment is referred in the structure of dc source, therefore not in this to go forth.By being equipped with the direct current for household electrical appliance
Power supply, can effectively reduce the electromagnetic interference (EMI) emissions of household electrical appliance.More specifically, the household electrical appliance can be electromagnetic oven or other
Household appliances, the electromagnetic interference (EMI) emissions thus, it is possible to reduce household appliances.
The optional embodiment of the utility model example is described in detail above in association with accompanying drawing, still, the utility model is implemented
Example is not limited to the detail in above-mentioned embodiment, can be right in the range of the technology design of the utility model embodiment
The technical scheme of the utility model embodiment carries out a variety of simple variants, and these simple variants belong to the utility model embodiment
Protection domain.
It is further to note that each particular technique feature described in above-mentioned embodiment, in not lance
In the case of shield, it can be combined by any suitable means.In order to avoid unnecessary repetition, the utility model is implemented
Example no longer separately illustrates to various possible combinations.
It will be appreciated by those skilled in the art that realizing that all or part of step in above-described embodiment method can be by
Program instructs the hardware of correlation to complete, and the program storage is in a storage medium, including some instructions are to cause one
Individual (can be single-chip microcomputer, chip etc.) or processor (processor) perform the whole of each embodiment methods described of the application
Or part steps.And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage (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, can also be combined between a variety of embodiments of the utility model embodiment, as long as
It is without prejudice to the thought of the utility model embodiment, and it should equally be considered as the utility model embodiment disclosure of that.
Claims (11)
1. a kind of EMI suppression circuits for Switching Power Supply, the Switching Power Supply is used to change in the alternating current from AC power
For direct current electricity output, the carrier of the EMI suppression circuits is circuit board, it is characterised in that the EMI suppression circuits include：
Filter capacitor, the first end of the filter capacitor is connected to earth terminal, and the second end is connected to the output of the Switching Power Supply
End；
First electric capacity, the first end of first electric capacity is connected to the first end of the filter capacitor, and the second end is connected to
The live wire of the AC power；And
Second electric capacity, the first end of second electric capacity is connected to the live wire, and the second end is connected to the institute of the filter capacitor
State the second end.
2. EMI suppression circuits according to claim 1, it is characterised in that：
First electric capacity and/or second electric capacity are ceramic disc capacitor.
3. EMI suppression circuits according to claim 1 or 2, it is characterised in that：
The pressure voltage of first electric capacity and/or second electric capacity is 220-3000VAC.
4. EMI suppression circuits according to claim 1 or 2, it is characterised in that：
The capacitance size of first electric capacity and/or second electric capacity is 101-104.
5. a kind of Switching Power Supply, it is characterised in that including：
AC-DC converting units, for the alternating current from AC power to be converted into direct current electricity output；And
EMI suppression circuits described in claim any one of 1-4.
6. Switching Power Supply according to claim 5, it is characterised in that the Switching Power Supply is also included：
First and second commutation diode, the positive pole of first and second commutation diode is respectively connecting to the live wire of alternating voltage
And zero line, negative pole connects the input of the AC-DC converting units.
7. Switching Power Supply according to claim 5, it is characterised in that the AC-DC converting units include one or more
Output, each of which output is equipped with the EMI suppression circuits according to claim any one of 1-4.
8. a kind of dc source, it is characterised in that including：
Switching Power Supply described in claim any one of 5-7, for the High Level AC Voltage of AC power to be converted into low-voltage direct
Electricity output；And
Rectification module, for the High Level AC Voltage of the AC power to be converted into HVDC electricity output.
9. dc source according to claim 8, it is characterised in that：
The rectification module is rectifier bridge.
10. a kind of household electrical appliance, it is characterised in that including dc source according to claim 8 or claim 9.
11. household electrical appliance according to claim 10, it is characterised in that the household electrical appliance are electromagnetic oven or electric cooker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621237027.3U CN206442291U (en) | 2016-11-18 | 2016-11-18 | EMI suppression circuits, Switching Power Supply, dc source and household electrical appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621237027.3U CN206442291U (en) | 2016-11-18 | 2016-11-18 | EMI suppression circuits, Switching Power Supply, dc source and household electrical appliance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206442291U true CN206442291U (en) | 2017-08-25 |
Family
ID=59644871
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621237027.3U Expired - Fee Related CN206442291U (en) | 2016-11-18 | 2016-11-18 | EMI suppression circuits, Switching Power Supply, dc source and household electrical appliance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206442291U (en) |
-
2016
- 2016-11-18 CN CN201621237027.3U patent/CN206442291U/en not_active Expired - Fee Related
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|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170825 Termination date: 20201118 |