CN206993068U - Filter circuit and cooking apparatus for household electrical appliances - Google Patents
Filter circuit and cooking apparatus for household electrical appliances Download PDFInfo
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- CN206993068U CN206993068U CN201720969653.XU CN201720969653U CN206993068U CN 206993068 U CN206993068 U CN 206993068U CN 201720969653 U CN201720969653 U CN 201720969653U CN 206993068 U CN206993068 U CN 206993068U
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- filter circuit
- electric capacity
- branch road
- magnetic bead
- tie point
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Abstract
The utility model provides a kind of filter circuit and cooking apparatus for household electrical appliances, the filter circuit includes input, output end and earth terminal, tie point between the input and the output end, the 3rd branch road between the second branch road and the earth terminal and the output end between the input and the earth terminal, the tie point includes inductance, second branch road includes the first electric capacity, 3rd branch road includes the second electric capacity, the filter circuit also includes magnetic bead, the magnetic bead is connected on the tie point, on any one in second branch road and the 3rd branch road, and the magnetic bead is used to filter out high frequency noise.As can be seen here, the filter circuit in the utility model includes magnetic bead, can either effective filter out middle low frequency noise, can also effective filter out high frequency noise, so as to the effect that improved significantly to the amplitude of EMC conduction tests part and radiation part of detecting.
Description
Technical field
It the utility model is related to a kind of filter circuit and cooking apparatus for household electrical appliances.
Background technology
The power supply power supply filter circuit of household appliances circuit uses common CLC π type filter circuit constructions more at present, low in
Effect is preferable in terms of frequency range filtering, can effectively lower Electro Magnetic Compatibility (Electromagnetic Compatibility, EMC)
The amplitude of low frequency in conduction test part, but for radiating the amplitude of part of detecting high frequency, such filter circuit effect is not
Substantially, or even to the amplitude of radiation test there is no improvement.
Utility model content
A series of concept of reduced forms is introduced in utility model content part, this will be in specific embodiment part
It is further described.Utility model content part of the present utility model is not meant to attempt to limit claimed
The key feature and essential features of technical scheme, do not mean that the protection for attempting to determine technical scheme claimed more
Scope.
In order to solve the above problems at least in part, the utility model provides a kind of filter circuit for household electrical appliances, institute
Stating filter circuit includes input, output end and earth terminal, and the tie point between the input and the output end is described
The 3rd branch road between the second branch road and the earth terminal and the output end between input and the earth terminal, it is described
Tie point includes inductance, and second branch road includes the first electric capacity, and the 3rd branch road includes the second electric capacity, the filtered electrical
Road also includes magnetic bead, and the magnetic bead is connected on any one in the tie point, second branch road and the 3rd branch road,
And the magnetic bead is used to filter out high frequency noise.
Exemplarily, the filter circuit also includes first electrodeless electric capacity in parallel with first electric capacity.
Exemplarily, the filter circuit also includes second electrodeless electric capacity in parallel with second electric capacity.
Exemplarily, first electric capacity and second electric capacity are electrochemical capacitor.
Exemplarily, the magnetic bead is connected on the tie point or the 3rd branch road, and first electric capacity is born
Pole connects the earth terminal.
Exemplarily, the magnetic bead is connected on the tie point or second branch road, and second electric capacity is born
Pole connects the earth terminal.
On the other hand, the utility model additionally provides a kind of cooking apparatus, including described in above-mentioned aspect or any example
Filter circuit.
As can be seen here, the filter circuit in the utility model includes magnetic bead, can either effective filter out middle low frequency noise,
High frequency noise can be effective filtered out, is significantly changed so as to have to the amplitude of EMC conduction tests part and radiation part of detecting
Kind effect.
Brief description of the drawings
, below will be to this practicality in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
The required accompanying drawing used is briefly described in new embodiment, it should be apparent that, drawings described below is only one
A little embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to these
Accompanying drawing obtains other accompanying drawings.In the accompanying drawings, identical reference typically represents same or analogous part.
Fig. 1 is an illustrative circuitry structure of filter circuit of the present utility model；
Fig. 2 is another illustrative circuitry structure of filter circuit of the present utility model；
Fig. 3 is another illustrative circuitry structure of filter circuit of the present utility model；
Fig. 4 (a)-(c) is another illustrative circuitry structure of filter circuit of the present utility model；
Fig. 5 (a)-(c) is another illustrative circuitry structure of filter circuit of the present utility model；
Fig. 6 (a)-(c) is another illustrative circuitry structure of filter circuit of the present utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describe, it is clear that described embodiment is part of the embodiment of the present utility model, rather than is all implemented
Example.Based on the embodiment in the utility model, those of ordinary skill in the art institute on the premise of creative work is not made
The every other embodiment obtained, it should all belong to the scope of the utility model protection.
Because the inductance in common CLC π type filter circuits has capacitance characteristic in filtering high frequency section, frequency is higher, electric capacity
Characteristic is more obvious, and electric capacity has coupling for high frequency noise, makes high frequency noise very smoothly just by inductance, so as to general
Logical CLC π type filter circuits are unable to reach the effect for filtering out EMC high frequency noises, it is impossible to effectively lower EMC radiation and test to obtain amplitude.
Exemplarily, the household electrical appliances in the present embodiment can be cooking apparatus, and cooking apparatus can be electric cooker, Voltage force
Pot, cooking machine, soy bean milk making machine, electric cooking pot or other electrical heating utensils.
The utility model provides a kind of filter circuit for household electrical appliances.The filter circuit include input (V_IN),
Output end (V_OUT) and earth terminal (GND), the tie point between the input and the output end, the input with
The 3rd branch road between the second branch road and the earth terminal and the output end between the earth terminal, the tie point
Including inductance (L1), second branch road includes the first electric capacity (C1), and the 3rd branch road includes the second electric capacity (C2), the filter
Wave circuit also includes magnetic bead (L2), and the magnetic bead is connected on appointing in the tie point, second branch road and the 3rd branch road
In meaning one, and the magnetic bead is used to filter out high frequency noise.
Wherein, input is direct-flow input end, and output end is DC output end.
Exemplarily, the first electric capacity and the second electric capacity can be electrochemical capacitor.Also, the positive pole connection of the first electric capacity is defeated
Enter end, the positive pole connection output end of the second electric capacity.That is, magnetic bead is connected on the tie point or the 3rd branch road
When, the negative pole of first electric capacity connects the earth terminal.When magnetic bead is connected on the tie point or second branch road,
The negative pole of second electric capacity connects the earth terminal.
The circuit structure of filter circuit for magnetic bead series connection on the first leg as shown in Figure 1, is as described in Figure 2 magnetic bead string
The circuit structure for the filter circuit being associated on the second branch road, it is illustrated in figure 3 the filter circuit that magnetic bead is connected on the 3rd branch road
Circuit structure.
In the utility model, magnetic bead can be ferrite bean (Ferrite Bead), be a kind of anti-interference element, filter out
High frequency noise significant effect, it is that high-frequency loss is very big the characteristics of Ferrite Material, there is very high magnetic conductivity, make the line of inductance
Caused electric capacity is minimum in the case of high frequency high resistant between circle winding, and when there is electric current to pass through in magnetic bead, ferrite is to low frequency
Electric current can produce larger decay almost without what impedance to the electric current of upper frequency.Wherein, the value of magnetic bead can basis
The frequency range of the required high frequency noise filtered out is set.That is, for filtering out the corresponding magnetic bead of different high-frequency bands
Value it is different, for example, the value of the magnetic bead when frequency filtered out is 100MHz is 600 ohm.
In addition, the value of inductance (L1), the first electric capacity (C1) and the second electric capacity (C2) can be according to required in the utility model
The middle low-frequency range filtered out is set.
For example, C1 value is that 4.7 μ F, L1 value is 1.5mH, and C2 value is 15 μ F；Or C1 value is 15 μ F,
L1 value is 1.5mH, and C2 value is 4.7 μ F, etc., originally new that this is not limited.
As can be seen here, the filter circuit in the utility model, when carrying out EMC conduction tests, because the impedance of magnetic bead can
To ignore, therefore can be by setting L1, C1 and C2 to filter out corresponding low and medium frequency noise.And when carrying out EMC radiation tests,
Filter out high frequency noise function because magnetic bead has, thus caused high frequency noise seldom or almost without can by L1, L2,
The ring that C1 and C2 are formed, so as to improve the amplitude of EMC radiation tests.
Exemplarily, the filter circuit in the utility model can also include first electrodeless electric capacity in parallel with the first electric capacity
And/or second electrodeless electric capacity (C4) in parallel with the second electric capacity (C3).
Filter circuit as shown in Fig. 4 (a)-(c) includes first electrodeless electric capacity (C3) in parallel with the first electric capacity (C1).Such as
Filter circuit shown in Fig. 5 (a)-(c) includes second electrodeless electric capacity (C4) in parallel with the second electric capacity (C2).Such as Fig. 6 (a)-(c)
Shown filter circuit includes first electrodeless electric capacity (C3) in parallel with the first electric capacity (C1), and including with the second electric capacity (C2)
Second electrodeless electric capacity (C4) in parallel.
Wherein, in Fig. 1, Fig. 4 (a), Fig. 5 (a) and Fig. 6 (a), magnetic bead is connected on the first leg, i.e. magnetic bead and inductance
(L1) connect, and the negative pole of the negative pole of the first electric capacity (C1) and the second electric capacity (C2) is grounded.Wherein, in Fig. 2, Fig. 4 (b), Fig. 5
(b) and in Fig. 6 (b), magnetic bead is connected on the second branch road, i.e., magnetic bead is connected with the first electric capacity (C1), and the second electric capacity (C2)
Negative pole is grounded.Wherein, in Fig. 3, Fig. 4 (c), Fig. 5 (c) and Fig. 6 (c), magnetic bead is connected on the 3rd branch road, i.e. magnetic bead and second
Electric capacity (C2) is connected, and the negative pole ground connection of the first electric capacity (C1).
In the embodiment shown in Fig. 4 to Fig. 6, due to adding electrodeless electric capacity C3 and/or C4, therefore it can strengthen and filter out
The effect of high frequency noise.Wherein, electrodeless electric capacity C3 and/or C4 value can be with very little, such as can be electrochemical capacitor C1 or C2
1/10 or 1/20 etc. of value, it is originally new that this is not limited.
Because paying attention to, although Fig. 1 to Fig. 6 shows the numerous embodiments of the filter circuit, it is appreciated that this to enumerate not
It is exclusive list, in claim limited range of the present utility model, other unshowned realization sides can also be included
Formula.
In addition, the utility model additionally provides a kind of cooking apparatus, the cooking apparatus can include any of the above-described embodiment
Described filter circuit.
Wherein, cooking apparatus can be electric cooker, electric pressure cooking saucepan, cooking machine, soy bean milk making machine, electric cooking pot or other electric heaters
Tool, the utility model are not limited this.
It is understood that the filter circuit described in any of the above-described embodiment can also be applied to other families outside cooking apparatus
Electric equipment, it is originally new that this is not limited.
As can be seen here, the filter circuit in the utility model includes magnetic bead, can either effective filter out middle low frequency noise,
High frequency noise can be effective filtered out, is significantly changed so as to have to the amplitude of EMC conduction tests part and radiation part of detecting
Kind effect.Further, during use is carried out to the household electrical appliances including the filter circuit, middle low frequency can be effective filtered out
With the noise of high frequency, avoiding the occurrence of dash current influences the life-span of device, so as to avoid frequent replacing of the user to device, lifting
Consumer's Experience.
It will be understood to those skilled in the art that described above, only specific embodiment of the present utility model, but this reality
It is not limited thereto with new protection domain, the skill that any one skilled in the art discloses in the utility model
In the range of art, change or replacement can be readily occurred in, should all be covered within the scope of protection of the utility model.Therefore, this practicality
New protection domain should be defined by scope of the claims.
Claims (7)
1. a kind of filter circuit for household electrical appliances, it is characterised in that the filter circuit includes input, output end and ground connection
End, the tie point between the input and the output end, the second branch road between the input and the earth terminal
And the 3rd branch road between the earth terminal and the output end, the tie point include inductance, the second branch road bag
The first electric capacity is included, the 3rd branch road includes the second electric capacity, and the filter circuit also includes magnetic bead, and the magnetic bead is connected on described
On any one in tie point, second branch road and the 3rd branch road, and the magnetic bead is used to filter out high frequency noise.
2. filter circuit according to claim 1, it is characterised in that the filter circuit also includes and first electric capacity
First electrodeless electric capacity in parallel.
3. filter circuit according to claim 1 or 2, it is characterised in that the filter circuit also includes and described second
Electric capacity the second electrodeless electric capacity in parallel.
4. filter circuit according to claim 1, it is characterised in that first electric capacity and second electric capacity are electricity
Solve electric capacity.
5. filter circuit according to claim 4, it is characterised in that the magnetic bead is connected on the tie point or described
On 3rd branch road, the negative pole of first electric capacity connects the earth terminal.
6. filter circuit according to claim 4, it is characterised in that the magnetic bead is connected on the tie point or described
On second branch road, the negative pole of second electric capacity connects the earth terminal.
7. a kind of cooking apparatus, it is characterised in that including the filter circuit any one of claim 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720969653.XU CN206993068U (en) | 2017-08-04 | 2017-08-04 | Filter circuit and cooking apparatus for household electrical appliances |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720969653.XU CN206993068U (en) | 2017-08-04 | 2017-08-04 | Filter circuit and cooking apparatus for household electrical appliances |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206993068U true CN206993068U (en) | 2018-02-09 |
Family
ID=61418660
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720969653.XU Active CN206993068U (en) | 2017-08-04 | 2017-08-04 | Filter circuit and cooking apparatus for household electrical appliances |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206993068U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110442221A (en) * | 2019-06-27 | 2019-11-12 | 芜湖康爱而电气有限公司 | A kind of DSP power supply circuit based on power supply chip |
| CN110943707A (en) * | 2019-12-19 | 2020-03-31 | Tcl华星光电技术有限公司 | Filter circuit and electronic device |
| CN117394812A (en) * | 2023-07-20 | 2024-01-12 | 荣耀终端有限公司 | Terminal equipment and noise reduction circuit |
-
2017
- 2017-08-04 CN CN201720969653.XU patent/CN206993068U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110442221A (en) * | 2019-06-27 | 2019-11-12 | 芜湖康爱而电气有限公司 | A kind of DSP power supply circuit based on power supply chip |
| CN110943707A (en) * | 2019-12-19 | 2020-03-31 | Tcl华星光电技术有限公司 | Filter circuit and electronic device |
| CN117394812A (en) * | 2023-07-20 | 2024-01-12 | 荣耀终端有限公司 | Terminal equipment and noise reduction circuit |
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