CN206595891U - Household electrical appliance and its electromagnetic interference suppression circuit - Google Patents
Household electrical appliance and its electromagnetic interference suppression circuit Download PDFInfo
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- CN206595891U CN206595891U CN201720321130.4U CN201720321130U CN206595891U CN 206595891 U CN206595891 U CN 206595891U CN 201720321130 U CN201720321130 U CN 201720321130U CN 206595891 U CN206595891 U CN 206595891U
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Abstract
The utility model discloses a kind of household electrical appliance and its electromagnetic interference suppression circuit, wherein, the household electrical appliance include rectification circuit, filter circuit and switching power circuit, control circuit, wherein, rectification circuit carries out rectification with output ripple direct current to the AC power of input, filter circuit is filtered processing to Rectified alternating current to export the first direct current, switching power circuit to the first direct current by being changed to export the second direct current supply control circuit, the voltage of second direct current is less than the voltage of the first direct current, the electromagnetic interference suppression circuit includes：Magnetic bead branch road, magnetic bead branch road includes at least one magnetic bead, wherein, filter circuit is by magnetic bead grounding, to suppress the electromagnetic interference from control circuit.According to electromagnetic interference suppression circuit of the present utility model, it can effectively suppress the electromagnetic interference from control circuit, and its simple in construction, cost is relatively low.
Description
Technical field
The utility model is related to household electrical appliance technical field, more particularly to a kind of electromagnetic interference suppression circuit of household electrical appliance
With a kind of household electrical appliance.
Background technology
Include switching power source chip in household electrical appliance circuit mostly, AC mains signal is converted into low-voltage direct letter
Number, supply control section (single-chip microcomputer and control circuit) work of electrical equipment.
Switching power source chip operationally high speed break-make, it is easy to produce electromagnetic interference.Single-chip microcomputer also has internal or external
Time circuit, is also easy to produce electromagnetic interference.In addition, for current intelligentized household electrical appliance, because its control section adds intelligence
Energy WIFI (Wireless Fidelity, a kind of WLAN) module etc., its low-voltage load power demand is larger, low tension
The DC-DC chips of high-load performance are used in road, and DC-DC chips also have with clock circuit, therefore circuit can also be produced
Larger electromagnetic interference.
In summary, the device such as switching power source chip, single-chip microcomputer, DC-DC chips can be larger to producing for whole circuit
Electromagnetic interference, influences the performance of household electrical appliance.In order to improve the situation, generally it can increase larger in the front stage circuits of Switching Power Supply
The electromagnetic interference eliminator part such as the safety electric capacity of capacitance or common mode inductance, differential mode inductance compared with big inductance quantity, this can undoubtedly make
The cost of whole circuit is greatly increased.
Utility model content
The utility model is intended at least solve one of technical problem in above-mentioned technology to a certain extent.Therefore, this reality
It is to propose a kind of electromagnetic interference suppression circuit of household electrical appliance with a new purpose, can effectively suppresses from control electricity
The electromagnetic interference on road, and its simple in construction, cost is relatively low.
Second purpose of the present utility model is to propose a kind of household electrical appliance.
To reach above-mentioned purpose, the utility model proposes a kind of electromagnetic interference suppression circuit of household electrical appliance, wherein, institute
Stating household electrical appliance includes rectification circuit, filter circuit and switching power circuit, control circuit, wherein, the rectification circuit is to defeated
The AC power entered carries out rectification with output ripple direct current, and the filter circuit is filtered processing to the Rectified alternating current
To export the first direct current, the switching power circuit to first direct current by being changed to export the second direct current
The control circuit is supplied, the voltage of second direct current is less than the voltage of first direct current, the electromagnetic interference suppression
Circuit processed includes：Magnetic bead branch road, the magnetic bead branch road includes at least one magnetic bead, wherein, the filter circuit passes through the magnetic
Pearl grounding, to suppress the electromagnetic interference from the control circuit.
According to the electromagnetic interference suppression circuit of household electrical appliance of the present utility model, include at least one magnetic bead by setting
Magnetic bead branch road, and make filter circuit by magnetic bead grounding, it can effectively suppress the electromagnetic interference from control circuit, and
Its simple in construction, cost is relatively low.
In addition, according to the utility model proposes household electrical appliance electromagnetic interference suppression circuit can also have it is following additional
Technical characteristic：
Specifically, the filter circuit includes：First filter inductance, one end of first filter inductance is connected to described
The output end of rectification circuit, the other end of first filter inductance is connected to the electrode input end of the switching power circuit；
First filter capacitor, one end of first filter capacitor is connected with one end of first filter inductance, first filtering
The other end ground connection of electric capacity；Second filter capacitor, one end of second filter capacitor is another with first filter inductance
End is connected, and the other end of second filter capacitor is connected to the negative input of the switching power circuit, and described the
The other end of two filter capacitors passes through the magnetic bead grounding.
Further, first filter capacitor and second filter capacitor are polar capacitor.
Preferably, the magnetic bead is paster magnetic bead.
Further, the electromagnetic interference suppression circuit of described household electrical appliance also includes：First electromagnetic interference suppresses unit,
First electromagnetic interference suppresses unit and is arranged between the input of the feeder ear of the household electrical appliance and the rectification circuit,
First electromagnetic interference, which suppresses unit, is used to suppress electromagnetic interference and the household electrical appliance itself from the AC power
The electromagnetic interference outwards conveyed.
Specifically in first electromagnetic interference, which suppresses unit, to be included：First electric capacity, first electric capacity is connected in parallel on described
The two ends of AC power；First common mode inductance, the first end of first common mode inductance is connected with one end of first electric capacity,
Second end of first common mode inductance is connected with the other end of first electric capacity；Second electric capacity, the one of second electric capacity
End is connected with the 3rd end of first common mode inductance, the other end of second electric capacity and the 4th of first common mode inductance
End is connected, and the two ends of second electric capacity are connected respectively to the first input end and the second input of the rectification circuit.
Further, first electromagnetic interference, which suppresses unit, also includes：The 3rd electric capacity and the 4th electric capacity of series connection, it is described
The 3rd electric capacity and the 4th electric capacity of series connection are connected in parallel with second electric capacity, and the 3rd electric capacity of the series connection and the 4th electric capacity
Between node ground connection.
Further, first electromagnetic interference, which suppresses unit, also includes：First piezo-resistance, first piezo-resistance
It is connected in parallel with first electric capacity；First resistor, the first resistor is connected in parallel with first electric capacity；Second resistance,
One end of the second resistance is connected with one end of second electric capacity, the other end of the second resistance and the rectification circuit
First input end be connected.
Wherein, the household electrical appliance are food cooking machine.
To reach above-mentioned purpose, the utility model also proposed a kind of household electrical appliance, it include the utility model proposes
The electromagnetic interference suppression circuit of household electrical appliance.
According to household electrical appliance of the present utility model, its electromagnetic interference suppression circuit can effectively suppress from control circuit
Electromagnetic interference, and its electromagnetic interference suppression circuit is simple in construction, cost is relatively low.
Brief description of the drawings
Fig. 1 is the circuit diagram of the household electrical appliance according to the utility model embodiment.
Embodiment
Embodiment of the present utility model is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning
Same or similar element or element with same or like function are represented to same or similar label eventually.Below by ginseng
The embodiment for examining accompanying drawing description is exemplary, it is intended to for explaining the utility model, and it is not intended that to the utility model
Limitation.
The household electrical appliance and its electromagnetic interference suppression circuit of the utility model embodiment are described below in conjunction with the accompanying drawings.
Fig. 1 is the circuit diagram of the household electrical appliance according to the utility model embodiment.
As shown in figure 1, the household electrical appliance of the utility model embodiment include rectification circuit 10 and filter circuit 20, household electric
Device may also include the switching power circuit for being connected to the rear class of filter circuit 20 and control circuit, wherein, rectification circuit 10 can be to defeated
The AC power entered carries out rectification with output ripple direct current, and filter circuit 20 can be filtered processing with defeated to Rectified alternating current
Go out the first direct current, switching power circuit is electric to export the supply control of the second direct current by being changed to the first direct current
Road.Wherein, the voltage of the second direct current is less than the voltage of the first direct current, can by providing the second direct current for control circuit
Control circuit is set to perform the work of relevant control household electrical appliance.
As shown in figure 1, electromagnetic interference suppression circuit may include magnetic bead branch road 100, magnetic bead branch road 100 may include at least one
Magnetic bead, wherein, filter circuit 20 is grounded by magnetic bead branch road 100, to suppress the electromagnetic interference from control circuit.In Fig. 1 with
Magnetic bead branch road 100 is used as example including a magnetic bead L093.It should be appreciated that in other embodiment of the present utility model, may be used also
The magnetic bead of multiple identical or different parameters is selected according to the real needs to electromagnetic interference inhibition, with parallel or series
Mode constitutes magnetic bead branch road 100.
Specifically, as shown in figure 1, rectification circuit 10 may include first to fourth diode D091, D092, D093 and
D094.Filter circuit 20 may include the first filter inductance L092, the first filter capacitor EC092 and the second filter capacitor EC093, its
In, the first filter inductance L092 one end is connected to the output end of rectification circuit 10, and the first filter inductance L092 other end connects
It is connected to the electrode input end a of switching power circuit.First filter capacitor EC092 one end and the first filter inductance L092 one end
It is connected, the first filter capacitor EC092 other end ground connection.Second filter capacitor EC093 one end and the first filter inductance L092
The other end be connected, the second filter capacitor EC093 other end is connected to the negative input b of switching power circuit, and the
The two filter capacitor EC093 other end meets signal ground HVG by magnetic bead branch road 100.Wherein, the first filter capacitor EC092 and
Two filter capacitor EC093 can be polar capacitor.
In one embodiment of the present utility model, magnetic bead can be paster magnetic bead, with lower-cost advantage.
In addition, in addition to being arranged on the magnetic bead branch road 100 at filter circuit 20, in the front stage circuits of filter circuit 20 also
It may include that electromagnetic interference suppresses unit.In one embodiment of the present utility model, as shown in figure 1, the utility model embodiment
Household electrical appliance electromagnetic interference suppression circuit may also include the first electromagnetic interference suppress unit 200, the first electromagnetic interference suppress
Unit 200 may be provided between the feeder ear of household electrical appliance and the input of rectification circuit 10, and the first electromagnetic interference suppresses unit
200 can be used for suppressing the electromagnetic interference that electromagnetic interference and household electrical appliance itself from AC power are outwards conveyed.
Specifically, as shown in figure 1, the first electromagnetic interference, which suppresses unit 200, includes the first electric capacity C091, the first common mode inductance
L091 and the second electric capacity C092, wherein, the first electric capacity C091 is connected in parallel on the two ends of AC power, the of the first common mode inductance L091
One end is connected with the first electric capacity C091 one end, is attached to the live wire L of AC power, the first common mode inductance L091 the second end
It is connected with the first electric capacity C091 other end, is attached to the zero line N of AC power.Second electric capacity C092 one end is total to first
Mould inductance L091 the 3rd end is connected, and the second electric capacity C092 other end is connected with the first common mode inductance L091 the 4th end, the
Two electric capacity C092 two ends are connected respectively to the first input end and the second input of rectification circuit 10.Of the present utility model one
In individual embodiment, the zero line L1 and zero that the first common mode inductance L091 first end and the second end can be loaded with the first forceful electric power respectively
Line end N1 is connected, to provide power supply for the load of the first forceful electric power, the first common mode inductance L091 the 3rd end and the 4th end can respectively with
The zero line L2 of second forceful electric power load is connected with zero line side N2, to provide power supply for the load of the second forceful electric power.Of the present utility model
In one embodiment, the first common mode inductance L091 first end can be connected to the live wire L of AC power by fuse F091, with
Overtemperature protection is carried out to late-class circuit.
As shown in figure 1, the first electromagnetic interference suppresses the 3rd electric capacity C093 and the 4th electric capacity that unit 200 may also include series connection
C094, the first piezo-resistance RZ091, first resistor R091 and second resistance R093, wherein, the 3rd electric capacity C093 of series connection and
4th electric capacity C094 is connected in parallel with the second electric capacity C092, and the section between the 3rd electric capacity C093 and the 4th electric capacity C094 of series connection
Point ground connection GND.First piezo-resistance RZ091 is connected in parallel with the first electric capacity C091, first resistor R091 and the first electric capacity C091
Be connected in parallel, second resistance R093 one end is connected with the second electric capacity C092 one end, the second resistance R093 other end with it is whole
The first input end of current circuit 10 is connected.
It should be appreciated that on the premise of identical electromagnetic interference inhibition is met, by being set at filter circuit 20
Magnetic bead branch road 100, for only setting the first electromagnetic interference to suppress unit 200 in front stage circuits, can significantly reduce the
One electromagnetic interference suppresses the first filter capacitor EC092 and the second filter capacitor EC093 capacitance and the first filtering in unit 200
Inductance L092 inductance value, reduces the requirement to front stage circuits component parameters, so as to reduce further the manufacture of household electrical appliance
Cost.
It should be noted that the household electrical appliance of the utility model embodiment can be food cooking machine, can also be insulating pot, electricity
The household electrical appliance of the electric heating such as hair-dryer class or electronic class.One or more of above-mentioned magnetic bead branch road 100 magnetic bead and the first electromagnetism
The parameter of the elements such as the first electric capacity, the first common mode inductance, the second electric capacity in AF panel unit 200 can be according to household electrical appliance
Specification and the real needs of electromagnetic interference inhibition are set.
According to the electromagnetic interference suppression circuit of the household electrical appliance of the utility model embodiment, include at least one by setting
The magnetic bead branch road of magnetic bead, and make filter circuit by magnetic bead grounding, it can effectively suppress the electromagnetism from control circuit and do
Disturb, and its simple in construction, cost is relatively low.
Correspondence above-described embodiment, the utility model also proposes a kind of household electrical appliance.
The household electrical appliance of the utility model embodiment, include the electricity of the household electrical appliance of the utility model above-described embodiment proposition
Magnetic disturbance suppression circuit, its specific embodiment can refer to above-described embodiment, to avoid redundancy, will not be repeated here.
According to the household electrical appliance of the utility model embodiment, its electromagnetic interference suppression circuit can effectively suppress from control
The electromagnetic interference of circuit, and its electromagnetic interference suppression circuit is simple in construction, cost is relatively low.
In description of the present utility model, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width
Degree ", " thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outer ",
The orientation or position relationship of the instruction such as " clockwise ", " counterclockwise ", " axial direction ", " radial direction ", " circumference " are based on shown in the drawings
Orientation or position relationship, are for only for ease of description the utility model and simplify description, rather than indicate or imply signified dress
Put or element there must be specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to the utility model
Limitation.
In addition, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or implying relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or
Implicitly include one or more this feature.In description of the present utility model, " multiple " are meant that two or two
More than, unless otherwise specifically defined.
In the utility model, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " Gu
It is fixed " etc. term should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integrally；Can be
Mechanically connect or electrically connect；Can be joined directly together, can also be indirectly connected to by intermediary, can be two
The connection of element internal or the interaction relationship of two elements.For the ordinary skill in the art, can basis
Concrete condition understands concrete meaning of the above-mentioned term in the utility model.
In the utility model, unless otherwise clearly defined and limited, fisrt feature is "above" or "below" second feature
Can be that the first and second features are directly contacted, or the first and second features pass through intermediary mediate contact.Moreover, first is special
Levy second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only
Represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be with
Be fisrt feature immediately below second feature or obliquely downward, or be merely representative of fisrt feature level height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or the spy that the embodiment or example are described
Point is contained at least one embodiment of the present utility model or example.In this manual, to the schematic table of above-mentioned term
State and be necessarily directed to identical embodiment or example.Moreover, specific features, structure, material or the feature of description can be with
Combined in an appropriate manner in any one or more embodiments or example.In addition, in the case of not conflicting, this area
Technical staff the not be the same as Example or the feature of example and non-be the same as Example or example described in this specification can be entered
Row is combined and combined.
Although embodiment of the present utility model has been shown and described above, it is to be understood that above-described embodiment is
Exemplary, it is impossible to it is interpreted as to limitation of the present utility model, one of ordinary skill in the art is in scope of the present utility model
It is interior above-described embodiment to be changed, changed, replaced and modification.
Claims (10)
1. a kind of electromagnetic interference suppression circuit of household electrical appliance, it is characterised in that the household electrical appliance include rectification circuit, filtering
Circuit and switching power circuit, control circuit, wherein, the rectification circuit carries out rectification to export arteries and veins to the AC power of input
Dynamic direct current, the filter circuit is filtered processing to the Rectified alternating current to export the first direct current, the switch electricity
Source circuit supplies the control circuit by being changed to first direct current to export the second direct current, and described second is straight
The voltage of stream electricity is less than the voltage of first direct current, and the electromagnetic interference suppression circuit includes：
Magnetic bead branch road, the magnetic bead branch road includes at least one magnetic bead, wherein, the filter circuit is connect by the magnetic bead branch road
Ground, to suppress the electromagnetic interference from the control circuit.
2. the electromagnetic interference suppression circuit of household electrical appliance according to claim 1, it is characterised in that the filter circuit bag
Include：
First filter inductance, one end of first filter inductance is connected to the output end of the rectification circuit, first filter
The other end of ripple inductance is connected to the electrode input end of the switching power circuit；
First filter capacitor, one end of first filter capacitor is connected with one end of first filter inductance, and described first
The other end ground connection of filter capacitor；
Second filter capacitor, one end of second filter capacitor is connected with the other end of first filter inductance, and described
The other end of two filter capacitors is connected to the negative input of the switching power circuit, and second filter capacitor is another
One end passes through the magnetic bead grounding.
3. the electromagnetic interference suppression circuit of household electrical appliance according to claim 2, it is characterised in that first filtered electrical
Hold and second filter capacitor is polar capacitor.
4. the electromagnetic interference suppression circuit of household electrical appliance according to claim 2, it is characterised in that the magnetic bead is paster
Magnetic bead.
5. the electromagnetic interference suppression circuit of the household electrical appliance according to any one of claim 1-4, it is characterised in that also wrap
Include：
First electromagnetic interference suppresses unit, first electromagnetic interference suppress unit be arranged on the feeder ears of the household electrical appliance with
Between the input of the rectification circuit, first electromagnetic interference, which suppresses unit, to be used to suppress the electricity from the AC power
The electromagnetic interference that magnetic disturbance and the household electrical appliance are outwards conveyed itself.
6. the electromagnetic interference suppression circuit of household electrical appliance according to claim 5, it is characterised in that first electromagnetism is done
Disturbing suppression unit includes：
First electric capacity, first electric capacity is connected in parallel on the two ends of the AC power；
First common mode inductance, the first end of first common mode inductance is connected with one end of first electric capacity, and described first is total to
Second end of mould inductance is connected with the other end of first electric capacity；
Second electric capacity, one end of second electric capacity is connected with the 3rd end of first common mode inductance, second electric capacity
The other end is connected with the 4th end of first common mode inductance, and the two ends of second electric capacity are connected respectively to the rectification circuit
First input end and the second input.
7. the electromagnetic interference suppression circuit of household electrical appliance according to claim 6, it is characterised in that first electromagnetism is done
Disturbing suppression unit also includes：
The 3rd electric capacity and the 4th electric capacity of series connection, the 3rd electric capacity of the series connection and the 4th electric capacity are in parallel with second electric capacity even
Connect, and the node ground connection between the 3rd electric capacity of the series connection and the 4th electric capacity.
8. the electromagnetic interference suppression circuit of household electrical appliance according to claim 7, it is characterised in that first electromagnetism is done
Disturbing suppression unit also includes：
First piezo-resistance, first piezo-resistance is connected in parallel with first electric capacity；
First resistor, the first resistor is connected in parallel with first electric capacity；
Second resistance, one end of the second resistance is connected with one end of second electric capacity, the other end of the second resistance
It is connected with the first input end of the rectification circuit.
9. the electromagnetic interference suppression circuit of the household electrical appliance according to any one of claim 1-8, it is characterised in that described
Household electrical appliance are food cooking machine.
10. a kind of household electrical appliance, it is characterised in that include the electricity of the household electrical appliance according to any one of claim 1-9
Magnetic disturbance suppression circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720321130.4U CN206595891U (en) | 2017-03-29 | 2017-03-29 | Household electrical appliance and its electromagnetic interference suppression circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720321130.4U CN206595891U (en) | 2017-03-29 | 2017-03-29 | Household electrical appliance and its electromagnetic interference suppression circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206595891U true CN206595891U (en) | 2017-10-27 |
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ID=60122795
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720321130.4U Active CN206595891U (en) | 2017-03-29 | 2017-03-29 | Household electrical appliance and its electromagnetic interference suppression circuit |
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| Country | Link |
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| CN (1) | CN206595891U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110086444A (en) * | 2019-04-25 | 2019-08-02 | 中国汽车技术研究中心有限公司 | A kind of filter for vehicle-mounted terminal equipment power supply |
-
2017
- 2017-03-29 CN CN201720321130.4U patent/CN206595891U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110086444A (en) * | 2019-04-25 | 2019-08-02 | 中国汽车技术研究中心有限公司 | A kind of filter for vehicle-mounted terminal equipment power supply |
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