CN207234656U - Filter circuit and cooking apparatus - Google Patents
Filter circuit and cooking apparatus Download PDFInfo
- Publication number
- CN207234656U CN207234656U CN201721245893.1U CN201721245893U CN207234656U CN 207234656 U CN207234656 U CN 207234656U CN 201721245893 U CN201721245893 U CN 201721245893U CN 207234656 U CN207234656 U CN 207234656U
- Authority
- CN
- China
- Prior art keywords
- common mode
- differential mode
- capacitance
- filter circuit
- unit
- 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.)
- Active
Links
Landscapes
- Filters And Equalizers (AREA)
Abstract
The utility model discloses filter circuit and cooking apparatus.Filter circuit is used for cooking apparatus.Filter circuit includes common mode filtering unit, the first differential mode filter unit and the second differential mode filter unit.Common mode filtering unit is used for filtering common mode interference signal.Two input terminals of the first differential mode filter unit are used to be connected with AC power, and two output terminals of the first differential mode filter unit are connected with two input terminals of common mode filter unit.Two input terminals of the second differential mode filter unit are connected with two output terminals of common mode filter unit, second differential mode filter unit only includes differential mode inductance and second capacitance, the both ends of differential mode inductance are respectively connected to an output terminal of common mode filtering unit and the first end of second capacitance, and the second end of the second capacitance is connected to another output terminal of common mode filtering unit.The filter circuit reduces the quantity of the capacitance in filter circuit on the premise of it disclosure satisfy that the requirement of Electro Magnetic Compatibility, reduces cost, and improve security performance.
Description
Technical field
Household electrical appliance technical field is the utility model is related to, specifically, a kind of filter circuit is the utility model is related to and cooks
Prepare food utensil.
Background technology
At present, safety requirement of the country to electronic product further improves.Wherein, Electro Magnetic Compatibility (Electro
Magnetic Compatibility, EMC) it is the project for having to pass through.Electro Magnetic Compatibility refers to equipment in its electromagnetic environment
In the operation that meets the requirements the ability of intolerable electromagnetic disturbance is not produced to any equipment in its environment.Therefore, electromagnetism
Compatibility includes the requirement of two aspects:On the one hand refer to that the electromagnetism that equipment produces place environment in normal course of operation is done
(Electromagnetic Interference, EMI) is disturbed no more than certain limit value；On the other hand refer to equipment to place
Electromagnetic disturbance present in environment has a degree of immunity to interference, i.e. electromagnetic susceptibility (Electromagnetic
Susceptibility, i.e. EMS).
Specifically, in household appliance technical field, in order to meet EMC Requirements, it usually needs set filter circuit.Example
Such as, filtered in the input terminal of AC power using filter circuit.A kind of schematic diagram of known filter circuit 1 is shown in Fig. 1.
As shown in Figure 1, filter circuit 1 is connected to the firewire L and zero curve N of AC power.Filter circuit 1 include three capacitances (i.e. C1,
C2, C3) and two inductance (i.e. common mode inductance L1 and differential mode inductance L2).In such filter circuit, capacitance quantity is more,
It is of high cost, and security performance is low.
Therefore, it is necessary to a kind of filter circuit and the cooking apparatus with the filter circuit are proposed, to solve at least in part
Certainly problems of the prior art.
Utility model content
A series of concept of reduced forms is introduced in utility model content part, this will be in specific embodiment part
Middle further description.The utility model content part of the utility model is not meant to attempt to limit claimed
Technical solution key feature and essential features, do not mean that more attempt determine technical solution claimed guarantor
Protect scope.
In order to solve the above problems at least in part, a kind of one side according to the present utility model, there is provided filtered electrical
Road.The filter circuit is used for cooking apparatus.The filter circuit includes common mode filtering unit, the first differential mode filter unit and the
Two differential mode filter units.The common mode filtering unit is used for filtering common mode interference signal.The two of the first differential mode filter unit
A input terminal is used to be connected with AC power, two output terminals and the common mode filtering unit of the first differential mode filter unit
Two input terminals connection.Two outputs of two input terminals of the second differential mode filter unit and the common mode filtering unit
End connection, the second differential mode filter unit only include differential mode inductance and second capacitance, the both ends point of the differential mode inductance
It is not connected to an output terminal of the common mode filtering unit and the first end of second capacitance, the second of second capacitance
End is connected to another output terminal of the common mode filtering unit.The filter circuit of embodiment according to the present utility model is in energy
On the premise of the requirement for enough meeting Electro Magnetic Compatibility, reduce the quantity of the capacitance in filter circuit, reduce cost, and carry
High security performance.
Alternatively, the common mode filtering unit includes common mode inductance.
Alternatively, the inductance value of the common mode inductance is 1mH-50mH.
Alternatively, the magnetic core of the common mode inductance is made of Ferrite Material or amorphous magnetic material.
Alternatively, the first differential mode filter unit includes the first capacitance, and the both ends of first capacitance are as described
The input terminal of one differential mode filter unit is respectively used to be connected to the zero curve and firewire of the AC power, the common mode filtering unit
Two input terminals be connected in parallel on the both ends of first capacitance.
Alternatively, the capacitance of first capacitance is 0.1 μ F-10 μ F.
Alternatively, the capacitance of second capacitance is 0.1 μ F-10 μ F.
Alternatively, the inductance value of the differential mode inductance is 100 μ H-900 μ H.
Alternatively, the magnetic core of the differential mode inductance is by soft magnetic materials, iron silica-alumina material, iron powder core material, Ferrite Material
Or amorphous magnetic material is made.
Other side according to the present utility model, additionally provides a kind of cooking apparatus.The cooking apparatus includes above-mentioned
Any filter circuit.
Alternatively, the cooking apparatus includes cooker body and lid.The lid can be opened and closed to be arranged in the cooker body,
To form cooking space between the lid and the cooker body.
Brief description of the drawings
The drawings below of the utility model embodiment is used to understand this practicality in this as the part of the utility model
It is new.Embodiment and its description shown in the drawings of the utility model, for explaining the principle of the utility model.In attached drawing
In,
Fig. 1 is a kind of known schematic diagram of filter circuit；
Fig. 2 is the schematic diagram according to the filter circuit of a preferred embodiment of the utility model；And
Fig. 3 is the test result of the emc testing carried out based on filter circuit shown in Figure 2.
Embodiment
In the following description, a large amount of concrete details are given more thoroughly to manage in order to provide to the utility model
Solution.It will be apparent, however, to one skilled in the art that the utility model embodiment may not need one or more
These a details and be carried out.In other examples, in order to avoid obscuring with the utility model embodiment, for
Some technical characteristics well known in the art are not described.
In order to thoroughly understand the utility model embodiment, detailed structure will be proposed in following description.Obviously, originally
The execution of utility model embodiment is not limited to the specific details that those skilled in the art is familiar with.
The utility model provides a kind of filter circuit.Filter circuit can be used for such as electric cooker.Electric cooker mainly can be with
Including cooker body and lid.Lid can be opened and closed to be arranged in cooker body, such as lid is pivotally disposed at pot by articulation piece
On body.Cooking space can be formed between lid and cooker body.It is appreciated that filter circuit can be also used for other cooking pots
Tool, such as electric pressure cooking saucepan, electromagnetic oven, electric kettle etc..The structure of above-mentioned cooking apparatus is known in the art, for sake of simplicity, this
Text is without describing in detail.Herein will only to cooking apparatus used by filter circuit illustrate.
As shown in Fig. 2, filter circuit 100 mainly include common mode filtering unit 110, the first differential mode filter unit 120 and
Second differential mode filter unit 130.Above three unit will be described in detail below.
Common mode filtering unit 110 is mainly used for filtering common mode interference signal.Common mode filtering unit 110 can include common mode and filter
Ripple unit first input end 111, the second input terminal of common mode filtering unit 112, the first output terminal of common mode filtering unit 113 and altogether
The second output terminal of mould filter unit 114.
Specifically, in the present embodiment, common mode filtering unit 110 can include common mode inductance L11.Common mode inductance L11
With two common mode inductance coils.Two input terminals of common mode inductance L11 correspond respectively to common mode filtering unit first input end
111st, the second input terminal of common mode filtering unit 112, two output terminals of common mode inductance L11 correspond respectively to common mode filtering unit
One output terminal 113 and the second output terminal of common mode filtering unit 114.Two common mode inductance coils of common mode inductance L11 are wound on together
On one magnetic core, the number of turn and phase are all identical (coiling is reverse).In this way, when the normal current in circuit flows through common mode inductance L11,
Electric current produces reverse magnetic field and cancels out each other in the inductance coil of same-phase coiling, and normal signal electric current is mainly by line at this time
Enclose the influence (and damping caused by leakage inductance on a small quantity) of resistance；It is same due to common mode current when there is common mode current flowing through coil
Tropism, magnetic field in the same direction can be produced in coil and increases the induction reactance of coil, coil is shown as high impedance, produce stronger resistance
Buddhist nun's effect, with this attenuation common-mode electric current, achievees the purpose that filtering common mode interference signal.
The frequency range of the common mode interference signal filtered out as needed, the magnetic core of common mode inductance L11 can be by ferrite material
Material or amorphous magnetic material are made.Wherein, amorphous magnetic material is structurally characterized in that interior atoms are in random state, do not have
Crystal periodicity, and amorphous magnetic material does not possess magnetic anisotropy, therefore, the common mode inductance made of amorphous magnetic material
L11 for common mode inductance L11 made of Ferrite Material, have higher permeability and inductance value, can to compared with
The common mode interference signal of high frequency, which has, preferably filters out effect.Alternatively, in the present embodiment, common mode inductance L11
Inductance value can be 1mH-50mH.
As shown in Fig. 2, the first differential mode filter unit 120 be connected to common mode filtering unit 110 and AC power 140 (such as
220V alternating currents AC power supplies) between.Specifically, two input terminals (i.e. the first differential mode filter unit of the first differential mode filter unit 120
121 and first the second input terminal 122 of differential mode filter unit of first input end) it is used to be connected with AC power 140；First differential mode is filtered
(i.e. first differential mode filter unit the first output terminal 123 and the first differential mode filter unit second are defeated for two output terminals of ripple unit 120
Outlet 124) with two input terminals (i.e. the common mode filtering unit first input end 111 and common mode filtering list of common mode filter unit 110
First second input terminal 112) connection.More specifically, the first differential mode filter unit first input end 121 can be with AC power 140
Firewire L connections, first the second input terminal of differential mode filter unit 122 can be connected with the zero curve N of AC power 140；First is poor
The first output terminal of mould filter unit 123 can be connected with common mode filter unit first input end 111, the first differential mode filter unit
Two output terminals 124 can be connected with the second input terminal of common mode filter unit 112.
First differential mode filter unit 120 is used to filter out the first DM EMI signal.Specifically, in the present embodiment,
One differential mode filter unit 120 can include the first capacitance C11.First capacitance C11 is X capacitances.The both ends conduct of first capacitance C11
Two input terminals of the first differential mode filter unit 120 are respectively used to be connected to the zero curve N and firewire L of AC power 140, i.e., and first
Capacitance C11 is connected across between the firewire L of AC power 140 and zero curve N.Two input terminal (i.e. common modes of common mode filtering unit 110
The second input terminal 112 of filter unit first input end 111 and common mode filtering unit) it is connected in parallel on the both ends of the first capacitance C11.Such as
This, the first capacitance C11 can filter out DM EMI signal as the first differential mode filter unit 120.Alternatively, the first capacitance C11
Capacitance can be 0.1 μ F-10 μ F.
Second differential mode filter unit 130 is used to further filter out not done by the differential mode that the first differential mode filter unit 120 filters out
Disturb signal.Second differential mode filter unit 130 includes two input terminals (i.e. the second differential mode filter unit first input end 131 and the
Two the second input terminals 132 of differential mode filter unit), two output terminals (i.e. common mode filter of two input terminals and common mode filter unit 110
The second output terminal 114 of the first output terminal of ripple unit 113 and common mode filtering unit) connect respectively.Specifically, the filtering of the second differential mode is single
First first input end 131 can be connected to the first output terminal of common mode filtering unit 113, second the second input terminal of differential mode filter unit
132 can be connected to the second output terminal of common mode filtering unit 114.Second differential mode filter unit 130 can also include two outputs
Hold (i.e. second differential mode filter unit the first output terminal 133 and second the second output terminal 134 of differential mode filter unit), the two outputs
End can be used for exporting it is filtered after alternating current.Alternatively, two output terminals of the second differential mode filter unit 130 can be with
It is connected with such as AC-DC conversion unit (not shown).
Specifically, in the present embodiment, as shown in Fig. 2, the second differential mode filter unit 130 only includes differential mode inductance L12
With a second capacitance C12.Differential mode inductance L12 be by magnetic core coiling formed, for suppressing DM EMI signal.One
Under fixed power frequency, differential mode inductance L12 is related with its inductance value to the obstruction ability of electric current.Specifically, inductance value is bigger, right
The obstruction ability of electric current is stronger, and inductance value is smaller, weaker to the obstruction ability of electric current.Therefore, it is certain in power frequency
In the case of, the ability that the higher differential mode inductance of inductance value suppresses DM EMI signal is stronger.Can be according to the difference of desired filtering
The material of the frequency selection magnetic core of mould interference signal.For example, the magnetic core of differential mode inductance L12 can be by soft magnetic materials, iron sial material
Material, iron powder core material, Ferrite Material or amorphous magnetic material etc. are made.Alternatively, the inductance value of differential mode inductance L12 can be
100μH-900μH.Second capacitance C12 is X capacitances.Alternatively, its capacitance can be 0.1 μ F-10 μ F.
The both ends of differential mode inductance L12 are respectively connected to an output terminal and the second capacitance C12 for common mode filtering unit 110
First end.The second end of second capacitance C12 is connected to another output terminal of common mode filtering unit 110.Specifically, in this implementation
In mode, (connected as shown in Fig. 2, the both ends of differential mode inductance L12 are respectively connected to the first output terminal of common mode filtering unit 113
To the output terminal of the firewire L of AC power 140) and the second capacitance C12 first end.The second end of second capacitance C12 is connected to
The second output terminal of common mode filtering unit 114 (output terminal for being connected to the zero curve N of AC power 140).It is it should be noted that poor
Mould inductance L12 can also be connected to the second output terminal of common mode filtering unit 114 and (be connected to the defeated of the zero curve N of AC power 140
Outlet) between the second capacitance C12.That is, differential mode inductance L12 is connected to where the firewire L or zero curve N of AC power 140
In path, the second capacitance C12 is connected in the path of firewire L and zero curve N compositions.
As shown in Figure 1 the outlet side in common mode inductance L1 of known filter circuit except including differential mode inductance L2 and
Outside second capacitance C2, the 3rd capacitance C3 at another both ends for being connected in parallel on common mode inductance L1 is further included.With known filtering
Circuit 1 is compared, and filter circuit 100 provided by the utility model reduces the X at the both ends for being connected in parallel on common mode filtering unit 110
Capacitance, so as to reduce the quantity of the capacitance in filter circuit 100, reduces cost, improves security performance.
In addition, the multiple test result of applicant is shown, the filter circuit 100 of embodiment according to the present utility model also can
Meet the requirement of Electro Magnetic Compatibility well.Show that the Electro Magnetic Compatibility carried out based on above-mentioned filter circuit 100 is surveyed in Fig. 3
The test result of examination.Wherein, abscissa represents the frequency of interference voltage, it is represented with Hz, and ordinate represents interference value, it, which is used, divides
Shellfish represents.Broken line RQP in figure represents the limit graph of the peak value of interference value, and chain-dotted line RAV represents the average value of interference value
Limit graph；Curve TQP represents the peak curve of the interference value of test；Curve TAV represents that the average value of the interference value of test is bent
Line.From figure 3, it can be seen that either the average value of the peak value of interference value or interference value is all far below its corresponding limit value,
Therefore, filter circuit according to the present utility model can meet the requirement of Electro Magnetic Compatibility completely.
In conclusion premise of the filter circuit 100 according to the present utility model in the requirement that disclosure satisfy that Electro Magnetic Compatibility
Under, reduce the quantity of the capacitance in filter circuit 100, reduce cost, and improve security performance.
Unless otherwise defined, the technology of technical and scientific term used herein and the technical field of the utility model
The normally understood implication of personnel is identical.Term used herein is intended merely to describe specifically to implement purpose, it is not intended that limit
The utility model processed.Terms such as herein presented " settings " can both represent that a component was attached directly to another portion
Part, can also represent that a component is attached to another component by middleware.Describe in one embodiment herein
Feature can be applied to another embodiment in combination individually or with further feature, unless this feature is in another implementation
Do not apply to or be otherwise noted in mode.
The utility model is illustrated by the above embodiment, but it is to be understood that, the above embodiment
The purpose illustrated and illustrated is only intended to, and is not intended to the utility model being limited in the range of described embodiment.This
Field technology personnel it is understood that teaching according to the present utility model can also make more kinds of variants and modifications, this
A little variants and modifications are all fallen within the utility model scope claimed.
Claims (11)
1. a kind of filter circuit, for cooking apparatus, it is characterised in that the filter circuit includes：
Common mode filtering unit, the common mode filtering unit are used for filtering common mode interference signal；
First differential mode filter unit, two input terminals of the first differential mode filter unit are used to be connected with AC power, described
Two output terminals of the first differential mode filter unit are connected with two input terminals of the common mode filtering unit；And
Second differential mode filter unit, two input terminals of the second differential mode filter unit with two of the common mode filtering unit
Output terminal connects, and the second differential mode filter unit only includes differential mode inductance and second capacitance, and the two of the differential mode inductance
End is respectively connected to an output terminal of the common mode filtering unit and the first end of second capacitance, second capacitance
Second end is connected to another output terminal of the common mode filtering unit.
2. filter circuit according to claim 1, it is characterised in that the common mode filtering unit includes common mode inductance.
3. filter circuit according to claim 2, it is characterised in that the inductance value of the common mode inductance is 1mH-50mH.
4. filter circuit according to claim 2, it is characterised in that the magnetic core of the common mode inductance by Ferrite Material or
Amorphous magnetic material is made.
5. filter circuit according to claim 1, it is characterised in that the first differential mode filter unit includes the first electricity
Hold, the both ends of first capacitance are respectively used to be connected to the alternating current as the input terminal of the first differential mode filter unit
The zero curve and firewire in source, two input terminals of the common mode filtering unit are connected in parallel on the both ends of first capacitance.
6. filter circuit according to claim 5, it is characterised in that the capacitance of first capacitance is 0.1 μ F-10 μ
F。
7. filter circuit according to claim 1, it is characterised in that the capacitance of second capacitance is 0.1 μ F-10 μ
F。
8. filter circuit according to claim 1, it is characterised in that the inductance value of the differential mode inductance is 100 μ H-900 μ
H。
9. filter circuit according to claim 1, it is characterised in that the magnetic core of the differential mode inductance is by soft magnetic materials, iron
Silica-alumina material, iron powder core material, Ferrite Material or amorphous magnetic material are made.
10. a kind of cooking apparatus, it is characterised in that the cooking apparatus includes the filter described in any one of claim 1 to 9
Wave circuit.
11. cooking apparatus according to claim 10, it is characterised in that the cooking apparatus includes：
Cooker body；
Lid, the lid can be opened and closed to be arranged in the cooker body, be cooked with being formed between the lid and the cooker body
Space.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721245893.1U CN207234656U (en) | 2017-09-26 | 2017-09-26 | Filter circuit and cooking apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721245893.1U CN207234656U (en) | 2017-09-26 | 2017-09-26 | Filter circuit and cooking apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207234656U true CN207234656U (en) | 2018-04-13 |
Family
ID=61864296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721245893.1U Active CN207234656U (en) | 2017-09-26 | 2017-09-26 | Filter circuit and cooking apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207234656U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024109802A1 (en) * | 2022-11-22 | 2024-05-30 | Hesai Technology Co., Ltd. | Filter circuit and electronic device |
-
2017
- 2017-09-26 CN CN201721245893.1U patent/CN207234656U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024109802A1 (en) * | 2022-11-22 | 2024-05-30 | Hesai Technology Co., Ltd. | Filter circuit and electronic device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104270002B (en) | Passive suppression method for conducted electromagnetic interface of PWM (power width modulation) power converter | |
| WO2015054689A1 (en) | Adjustable integrated combined common mode and differential mode three phase inductors and methods of manufacture and use thereof | |
| CN107306079B (en) | Filtering method, system and device | |
| CN209233717U (en) | A kind of EMC filter circuit | |
| CN100429855C (en) | Power supply wave shape correcting filter | |
| CN105048797A (en) | Filter circuit for electromagnetic heating of electromagnetic type heating electric cooker | |
| CN207234656U (en) | Filter circuit and cooking apparatus | |
| CN205847083U (en) | EMC filter circuit and electromagnetism stove | |
| CN103701427B (en) | For improving the household electrical appliance external front end filter of Homeplug power spectral density | |
| CN204858963U (en) | Electromagnetic type adds thermoelectric rice cooker's filter circuit for electromagnetic heating | |
| CN206149135U (en) | EMC filter circuit and electromagnetism stove | |
| CN212850432U (en) | High-insertion-loss passive EMI filter | |
| CN205610960U (en) | Electromagnetic heating device | |
| CN209357576U (en) | Transformer and cooking apparatus for cooking apparatus | |
| CN102222910A (en) | Filtering system | |
| CN113937990A (en) | Method for optimizing filter parameters of matrix converter | |
| CN207234667U (en) | Filter circuit and cooking apparatus | |
| CN206834982U (en) | Filter circuit, electromagnetic heating circuit and household electrical appliance | |
| CN207251950U (en) | Filter circuit and cooking apparatus for household electrical appliances | |
| CN206313650U (en) | Electromagnetic compatibility wave filter and household electrical appliance | |
| CN206180833U (en) | Electromagnetic compatibility wave filter and domestic appliance | |
| CN206211829U (en) | Electromagnetic compatibility filter circuit, dc source and household electrical appliance | |
| CN201374641Y (en) | Anti-electromagnetic interference circuit structure of large-screen liquid crystal television | |
| CN208625395U (en) | Cooking apparatus | |
| CN210867491U (en) | Filter circuit, switching power supply and air conditioner |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |