CN209692718U - Filter device and electric apparatus - Google Patents
Filter device and electric apparatus Download PDFInfo
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- CN209692718U CN209692718U CN201920536221.9U CN201920536221U CN209692718U CN 209692718 U CN209692718 U CN 209692718U CN 201920536221 U CN201920536221 U CN 201920536221U CN 209692718 U CN209692718 U CN 209692718U
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- mode interference
- interference suppression
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Abstract
The present disclosure provides a filter device and an electric apparatus. The filtering device includes: at least one stage of filter circuit; the common mode interference suppression circuit comprises at least one common mode interference suppression circuit, a filter circuit and a ground circuit, wherein the first end of the common mode interference suppression circuit is electrically connected with the corresponding filter circuit, and the second end of the common mode interference suppression circuit is electrically connected with the ground circuit; and the interference elimination circuit is arranged on the grounding circuit. The method and the device can effectively inhibit common-mode interference and improve the electromagnetic compatibility of electrical equipment.
Description
Technical field
This disclosure relates to field of circuit technology, in particular to a kind of filter and electrical equipment.
Background technique
In the related art, in order to eliminate the electromagnetic interference in electrical equipment, using multi-stage filter circuit to electrical equipment
Input power be filtered.One choke coil is set in every level-one filter circuit, and a winding in choke coil connects
On firewire, another winding in choke coil is connect on zero curve, to eliminate the interference signal on power circuit.
Utility model content
Inventors noted that the two windings do not have foot simultaneously when common mode current passes through two windings in choke coil
Enough big magnetic flux, that is, winding and do not have sufficiently large inductance, therefore common mode current can not be completely inhibited, i.e., can not have
Effect solves the electromagnetic interference problem of electrical equipment.
For this purpose, the disclosure provides a kind of scheme that can effectively inhibit electromagnetic interference in electrical equipment.
According to the first aspect of the embodiments of the present disclosure, a kind of filter is provided, comprising: at least one level filter circuit；Extremely
A few common-mode interference suppression circuit, wherein the first end of the common-mode interference suppression circuit is electrically connected with corresponding filter circuit
It connects, the second end of the common-mode interference suppression circuit is electrically connected with ground path；Interference cancellation circuit is arranged in the ground line
On the road.
In some embodiments, the common-mode interference suppression circuit and the filter circuit correspond.
In some embodiments, the first end of the interference cancellation circuit is electrically connected with the ground terminal, and the interference disappears
Except the second end of circuit is electrically connected with the second end of the common-mode interference suppression circuit.
In some embodiments, in the case where the filter includes multi-stage filter circuit, electricity is eliminated in the interference
Road is between two adjacent common-mode interference suppression circuits.
In some embodiments, the interference cancellation circuit includes that curent change slows down device.
In some embodiments, the interference cancellation circuit further includes the energy for slowing down device series connection with curent change
Consumers.
In some embodiments, it includes inductor or magnetic bead that the curent change, which slows down device,；The energy consumption device
Including resistor.
In some embodiments, the common-mode interference suppression circuit includes first capacitor device, and the of the first capacitor device
One end is electrically connected with a power line in the firewire and zero curve in corresponding filter circuit, the second end of the first capacitor device
It is electrically connected with the ground path.
In some embodiments, the common-mode interference suppression circuit further includes the second capacitor, second capacitor
First end is electrically connected with another power line in the firewire and zero curve in the corresponding filter circuit, second capacitor
Second end be electrically connected with the ground path.
According to the second aspect of an embodiment of the present disclosure, a kind of electrical equipment is provided, including as above-mentioned any embodiment is related to
Filter.
By the detailed description referring to the drawings to the exemplary embodiment of the disclosure, the other feature of the disclosure and its
Advantage will become apparent.
Detailed description of the invention
In order to illustrate more clearly of the embodiment of the present disclosure or technical solution in the prior art, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Disclosed some embodiments without any creative labor, may be used also for those of ordinary skill in the art
To obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of the filter of an embodiment of the present disclosure；
Fig. 2 is the structural schematic diagram of the filter of another embodiment of the disclosure；
Fig. 3 is the structural schematic diagram of the filter of another embodiment of the disclosure；
Fig. 4 is the structural schematic diagram of the filter of another embodiment of the disclosure；
Fig. 5 is the structural schematic diagram of the filter of another embodiment of the disclosure；
Fig. 6 is the structural schematic diagram of the filter of another embodiment of the disclosure；
Fig. 7 is the structural schematic diagram of the filter of another embodiment of the disclosure；
Fig. 8 is the structural schematic diagram of the filter of another embodiment of the disclosure.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present disclosure, the technical solution in the embodiment of the present disclosure is carried out clear, complete
Site preparation description, it is clear that described embodiment is only disclosure a part of the embodiment, instead of all the embodiments.Below
Description only actually at least one exemplary embodiment be it is illustrative, never as to the disclosure and its application or making
Any restrictions.Based on the embodiment in the disclosure, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, belong to the disclosure protection range.
Unless specifically stated otherwise, positioned opposite, the digital table of the component and step that otherwise illustrate in these embodiments
Up to the unlimited the scope of the present disclosure processed of formula and numerical value.
Simultaneously, it should be appreciated that for ease of description, the size of various pieces shown in attached drawing is not according to reality
Proportionate relationship draw.
Technology, method and apparatus known to person of ordinary skill in the relevant may be not discussed in detail, but suitable
In the case of, the technology, method and apparatus should be considered as authorizing part of specification.
It is shown here and discuss all examples in, any occurrence should be construed as merely illustratively, without
It is as limitation.Therefore, the other examples of exemplary embodiment can have different values.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, then in subsequent attached drawing does not need that it is further discussed.
Fig. 1 is the structural schematic diagram of the filter of an embodiment of the present disclosure.As shown in Figure 1, filter includes extremely
Few level-one filter circuit and at least one common-mode interference suppression circuit.As an example, giving first order filter circuit 11 in Fig. 1
With second level filter circuit 12, and corresponding common-mode interference suppression circuit 21 and 22.L and N is respectively input filter circuit
Firewire and zero curve, L-out and N-out are respectively the firewire and zero curve of filter circuit output.What needs to be explained here is that each
In grade filter circuit, it is both provided with a choke coil, a winding in choke coil connects on firewire, another in choke coil
Winding connects on zero curve.
The first end of common-mode interference suppression circuit 21 is electrically connected with first order filter circuit 11, common-mode interference suppression circuit 21
Second end be electrically connected with ground path 3.The first end of common-mode interference suppression circuit 22 is electrically connected with second level filter circuit 12,
The second end of common-mode interference suppression circuit 22 is electrically connected with ground path 3.Interference cancellation circuit 4 is arranged on ground path 3, with
Just inhibit electromagnetic interference.
What needs to be explained here is that can select as needed interference cancellation circuit 4 that the position on ground path 3 is arranged in.
In some embodiments, as shown in Figure 1, the first end of interference cancellation circuit 4 is electrically connected with ground terminal, interference is eliminated
The second end of circuit 4 is electrically connected with the second end of common-mode interference suppression circuit 21,22.That is, the of each common-mode interference suppression circuit
Two ends are electrically connected by interference cancellation circuit 4 with ground terminal.
Fig. 2 is the structural schematic diagram of the filter of another embodiment of the disclosure.Fig. 2 the difference from Fig. 1 is that,
In the embodiment depicted in figure 2, in the case where filter includes multi-stage filter circuit, interference cancellation circuit 4 is located at adjacent
Between two common-mode interference suppression circuits.
As shown in Fig. 2, the second end of common-mode interference suppression circuit 21 is electrically connected at the A of ground path 3 with ground path 3
It connects, the second end of common-mode interference suppression circuit 22 is electrically connected at the B of ground path 3 with ground path 3.Interference cancellation circuit 4
It is arranged at the A on ground path 3 and between B.
In some embodiments, the common-mode interference suppression circuit in filter and filter circuit correspond.
Fig. 3 is the structural schematic diagram of the filter of another embodiment of the disclosure.
In the embodiment shown in fig. 3, filter includes first order filter circuit 11, second level filter circuit 12 and third
Grade filter circuit 13.The first end of common-mode interference suppression circuit 21 is electrically connected with first order filter circuit 11, and common mode interference inhibits
The second end of circuit 21 is electrically connected with ground path 3.The first end and second level filter circuit 12 of common-mode interference suppression circuit 22
Electrical connection, the second end of common-mode interference suppression circuit 22 are electrically connected with ground path 3.The first end of common-mode interference suppression circuit 23
It is electrically connected with second level filter circuit 13, the second end of common-mode interference suppression circuit 23 is electrically connected with ground path 3.By to every
Level-one filter circuit configures common-mode interference suppression circuit, and common mode interference can be effectively suppressed.
In further embodiments, the common-mode interference suppression circuit in filter can also be with the different a pair of filter circuit
It answers.
Fig. 4 is the structural schematic diagram of the filter of another embodiment of the disclosure.
In the embodiment shown in fig. 4, filter includes first order filter circuit 11, second level filter circuit 12 and third
Grade filter circuit 13.The first end of common-mode interference suppression circuit 21 is electrically connected with first order filter circuit 11, and common mode interference inhibits
The second end of circuit 21 is electrically connected with ground path 3.The first end and second level filter circuit 13 of common-mode interference suppression circuit 23
Electrical connection, the second end of common-mode interference suppression circuit 23 are electrically connected with ground path 3.It can inhibit the same of common mode interference as a result,
When, moreover it is possible to it effectively reduces cost.
Fig. 5 is the structural schematic diagram of the filter of another embodiment of the disclosure.Fig. 5 the difference from Fig. 2 is that,
It in the embodiment shown in fig. 5, include that curent change slows down device 41 in interference cancellation circuit 4.
In some embodiments, it may include inductor or magnetic bead that curent change, which slows down device 41,.By using inductor or
Magnetic bead can slow down the change rate of common mode current.Thus common mode interference can be effectively suppressed, promote the electromagnetic compatibility of electrical equipment
Property.
In some embodiments, the inductance value of inductor is not more than 500 μ H.
Fig. 6 is the structural schematic diagram of the filter of another embodiment of the disclosure.Fig. 6 the difference from Fig. 5 is that,
It in the embodiment shown in fig. 6, further include the energy consumption for slowing down the series connection of device 41 with curent change in interference cancellation circuit 4
Device 42.
In some embodiments, energy consumption device 42 includes resistor or other energy dissipation devices.Pass through consumption electricity
Magnetic disturbance energy can further promote the Electro Magnetic Compatibility of electrical equipment.
In some embodiments, the resistance value of resistor is not more than 1000 Ω.
In disclosure filter provided by the above embodiment, by being connect what is be electrically connected with common-mode interference suppression circuit
Setting interference cancellation circuit in ground wire road promotes the Electro Magnetic Compatibility of electrical equipment effectively to inhibit common mode interference.
Fig. 7 is the structural schematic diagram of the filter of another embodiment of the disclosure.
As shown in fig. 7, being filtered using secondary filter circuit to firewire and zero curve.L1 is first order filter circuit
In choke coil, L2 be second level filter circuit in choke coil.Capacitor 51,52 and 53 is the X for inhibiting DM EMI
Capacitor.
In some embodiments, in common-mode interference suppression circuit include first capacitor device, the first end of first capacitor device with
Firewire or zero curve electrical connection, the second end of first capacitor device in corresponding filter circuit are electrically connected with ground path.
For example, as shown in fig. 7, in common-mode interference suppression circuit 21 include first capacitor device 211, first capacitor device 211
First end is connected with the firewire in corresponding filter circuit, and the second end of first capacitor device 211 is electrically connected with ground path 3.This
It outside, include first capacitor device 221, the first end of first capacitor device 221 and corresponding filtered electrical in common-mode interference suppression circuit 22
Firewire connection in road, the second end of first capacitor device 221 are electrically connected with ground path 3.
Fig. 8 is the structural schematic diagram of the filter of another embodiment of the disclosure.Fig. 8 the difference from Fig. 7 is that,
In the embodiment shown in fig. 8, common-mode interference suppression circuit further includes the second capacitor, the first end of the second capacitor with it is corresponding
Another power line electrical connection in firewire and zero curve in filter circuit, second end and the ground path of the second capacitor are electrically connected
It connects.
For example, as shown in figure 8, further including the second capacitor in common-mode interference suppression circuit 21 in addition to first capacitor device 211
Device 212.The first end of second capacitor 212 in corresponding filter circuit firewire or zero curve be electrically connected, the second capacitor 212
Second end be electrically connected with ground path 3.That is the first end of first capacitor device 211 and the first end of the second capacitor 212 institute electricity
The power line of connection is not identical.In addition, further including second in common-mode interference suppression circuit 22 in addition to first capacitor device 221
Capacitor 222.The first end of second capacitor 222 in corresponding filter circuit firewire or zero curve be electrically connected, the second capacitor
The second end of device 222 is electrically connected with ground path 3.That is the first end of the first end of first capacitor device 221 and the second capacitor 222
The power line being electrically connected is not identical.
The disclosure also provides a kind of electrical equipment.The electrical equipment includes the filter that any embodiment is related into Fig. 8 such as Fig. 1
Wave apparatus.By the way that filter provided by the disclosure is arranged in the electrical apparatus, it is able to ascend the electromagnetic compatibility of electrical equipment
Property.
The description of the disclosure is given for the purpose of illustration and description, and is not exhaustively or by the disclosure
It is limited to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.It selects and retouches
Embodiment is stated and be the principle and practical application in order to more preferably illustrate the disclosure, and those skilled in the art is enable to manage
The solution disclosure is to design various embodiments suitable for specific applications with various modifications.
Claims (10)
1. a kind of filter characterized by comprising
At least one level filter circuit；
At least one common-mode interference suppression circuit, wherein the first end of the common-mode interference suppression circuit and corresponding filter circuit
Electrical connection, the second end of the common-mode interference suppression circuit are electrically connected with ground path；
Interference cancellation circuit is arranged on the ground path.
2. filter according to claim 1, which is characterized in that
The common-mode interference suppression circuit and the filter circuit correspond.
3. filter according to claim 1, which is characterized in that
The first end of the interference cancellation circuit is electrically connected with ground terminal, the second end of the interference cancellation circuit and the common mode
The second end of codan is electrically connected.
4. filter according to claim 1, which is characterized in that
In the case where the filter includes multi-stage filter circuit, the interference cancellation circuit is located at two adjacent common modes
Between codan.
5. filter according to claim 1, which is characterized in that
The interference cancellation circuit includes that curent change slows down device.
6. filter according to claim 5, which is characterized in that
The interference cancellation circuit further includes the energy consumption device for slowing down device series connection with curent change.
7. filter according to claim 6, which is characterized in that
It includes inductor or magnetic bead that the curent change, which slows down device,；
The energy consumption device includes resistor.
8. filter described in any one of -7 according to claim 1, which is characterized in that
The common-mode interference suppression circuit includes first capacitor device, the first end of the first capacitor device and corresponding filter circuit
In firewire and zero curve in the electrical connection of a power line, second end and the ground path of the first capacitor device be electrically connected
It connects.
9. filter according to claim 8, which is characterized in that
The common-mode interference suppression circuit further includes the second capacitor, the first end of second capacitor and the corresponding filter
Another power line electrical connection in firewire and zero curve in wave circuit, the second end of second capacitor and the ground line
Road electrical connection.
10. a kind of electrical equipment, which is characterized in that including filter as claimed in any one of claims 1-9 wherein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920536221.9U CN209692718U (en) | 2019-04-18 | 2019-04-18 | Filter device and electric apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920536221.9U CN209692718U (en) | 2019-04-18 | 2019-04-18 | Filter device and electric apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209692718U true CN209692718U (en) | 2019-11-26 |
Family
ID=68608037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920536221.9U Active CN209692718U (en) | 2019-04-18 | 2019-04-18 | Filter device and electric apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209692718U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109921762A (en) * | 2019-04-18 | 2019-06-21 | 珠海格力电器股份有限公司 | Filter device and electric apparatus |
-
2019
- 2019-04-18 CN CN201920536221.9U patent/CN209692718U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109921762A (en) * | 2019-04-18 | 2019-06-21 | 珠海格力电器股份有限公司 | Filter device and electric apparatus |
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