CN212258769U - Filter circuit and air conditioner - Google Patents
Filter circuit and air conditioner Download PDFInfo
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- CN212258769U CN212258769U CN202020679971.4U CN202020679971U CN212258769U CN 212258769 U CN212258769 U CN 212258769U CN 202020679971 U CN202020679971 U CN 202020679971U CN 212258769 U CN212258769 U CN 212258769U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The utility model provides a filter circuit and air conditioner, filter circuit includes: the input end of the differential mode interference signal eliminating circuit is connected with an alternating current power supply; a first port of the common mode interference signal eliminating circuit is connected with an output end of the differential mode interference signal eliminating circuit, and a second port of the common mode interference signal eliminating circuit is connected with a grounding wire; the input end of the rectifying circuit is connected with the output end of the differential mode interference signal eliminating circuit; the common mode interference signal eliminating circuit is provided with a first inductor, a first capacitor and a second capacitor. The utility model discloses only need set up single-stage common mode inductance, can eliminate the common mode signal of large component, reduced the volume of corresponding common mode inductance coil and circuit board, save cost optimization circuit structure.
Description
Technical Field
The utility model belongs to the technical field of domestic appliance and specifically relates to a filter circuit and air conditioner are related to.
Background
At present, the air conditioner can be applied to a variable frequency drive board, and the variable frequency drive board has a plurality of concentrated high-power device switches for chopping, so that the interference is very large, and the common-mode signal component is very large. In the prior art, a common mode inductor is matched with a Y capacitor for filtering and filtering common mode signals, so that a large common mode inductor is often required, and the occupied area of a PCB is large.
In a common alternating current power supply filter circuit, a PCB generally requires two-stage common mode inductor filtering and can be realized by matching a plurality of capacitors, so that the filter circuit is complex. And some capacitors are located at the front end of the noise source and directly bypass the ground wire, which can cause the noise source signal to leak to the ground, thus reducing the filtering effect. In addition, the ground wire of the conventional two-stage common mode inductance filter circuit is long, and the leaked high-frequency signal is easy to generate space radiation on the ground wire.
SUMMERY OF THE UTILITY MODEL
The utility model provides a filter circuit and air conditioner only needs to set up single-stage common mode inductance, can eliminate the common mode signal of large component, has reduced the volume of corresponding common mode inductance coil and circuit board, saves cost-effective circuit structure.
In order to solve the technical problem, an embodiment of the utility model provides a filter circuit, include:
the input end of the differential mode interference signal eliminating circuit is connected with an alternating current power supply;
a first port of the common mode interference signal eliminating circuit is connected with an output end of the differential mode interference signal eliminating circuit, and a second port of the common mode interference signal eliminating circuit is connected with a grounding wire;
the input end of the rectifying circuit is connected with the output end of the differential mode interference signal eliminating circuit;
the common mode interference signal eliminating circuit is provided with a first inductor, a first capacitor and a second capacitor.
Further, the first port of the common mode interference signal cancellation circuit is connected to the output end of the differential mode interference signal cancellation circuit, specifically:
the output end of the differential mode interference signal eliminating circuit comprises: a first output port and a second output port;
one end of the first capacitor is connected with the first output port, and one end of the second capacitor is connected with the second output port;
one end of the first inductor is connected with the other end of the first capacitor and the other end of the second capacitor respectively; the other end of the first inductor is connected with a ground wire of the alternating current power supply.
Further, the differential mode interference signal cancellation circuit includes: the common-mode inductor comprises a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor and a common-mode inductor;
the first input end of the common mode inductor is connected with a live wire of the alternating current power supply, and the second input end of the common mode inductor is connected with a zero line of the alternating current power supply;
a first output end of the common mode inductor is connected with a first output port of the differential mode interference signal eliminating circuit, and a second output end of the common mode inductor is connected with a second output port of the differential mode interference signal eliminating circuit;
one end of the third capacitor is connected with a live wire of the alternating current power supply, and the other end of the third capacitor is connected with a ground wire of the alternating current power supply;
one end of the fourth capacitor is connected with a zero line of the alternating current power supply, and the other end of the fourth capacitor is connected with a ground wire of the alternating current power supply;
one end of the fifth capacitor is connected with the live wire of the alternating current power supply, and the other end of the fifth capacitor is connected with the zero line of the alternating current power supply;
one end of the sixth capacitor is connected with the first output end of the common mode inductor, and the other end of the sixth capacitor is connected with the second output end of the common mode inductor.
Further, the third capacitor is a capacitor with a capacitance value ranging from 1nF to 10 nF;
the fourth capacitance is a capacitance with a capacitance value ranging from 1nF to 10 nF.
Furthermore, the fifth capacitor is a capacitor with a capacitance value ranging from 0.1uF to 3 uF.
Furthermore, the sixth capacitor is a capacitor with a capacitance value ranging from 0.1uF to 3 uF.
Further, the first capacitor and the second capacitor are adjustable capacitors.
The embodiment of the utility model provides an air conditioner is still provided, including foretell filter circuit.
The embodiment of the utility model provides a filter circuit and air conditioner, filter circuit includes: the input end of the differential mode interference signal eliminating circuit is connected with an alternating current power supply; a first port of the common mode interference signal eliminating circuit is connected with an output end of the differential mode interference signal eliminating circuit, and a second port of the common mode interference signal eliminating circuit is connected with a grounding wire; the input end of the rectifying circuit is connected with the output end of the differential mode interference signal eliminating circuit; the common mode interference signal eliminating circuit is provided with a first inductor, a first capacitor and a second capacitor. The utility model discloses only need set up single-stage common mode inductance, can eliminate the common mode signal of large component, reduced the volume of corresponding common mode inductance coil and circuit board, save cost optimization circuit structure.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a filter circuit provided by the present invention;
fig. 2 is a schematic structural diagram of another embodiment of the filter circuit provided by the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1, the present invention provides a schematic structure diagram of an embodiment of a filter circuit. As shown in fig. 1, the filter circuit includes a differential mode interference signal cancellation circuit 1, a common mode interference signal cancellation circuit 2, and a rectification circuit 3.
The input end of the differential mode interference signal eliminating circuit 1 is connected with an alternating current power supply 4.
A first port of the common mode interference signal eliminating circuit 2 is connected with the output end of the differential mode interference signal eliminating circuit 1, and a second port thereof is connected with a grounding wire;
and the input end of the rectifying circuit 3 is connected with the output end of the differential mode interference signal eliminating circuit 1.
The more detailed and specific circuit structure of this embodiment can be, but is not limited to, see fig. 2, and fig. 2 is a time-shift diagram of the structure of another embodiment of the filter circuit provided by the present invention. The common mode interference signal eliminating circuit 2 is provided with a first inductor LD1, a first capacitor CY1 and a second capacitor CY 2. The differential mode interference signal cancellation circuit 1 includes: a third capacitor CY3, a fourth capacitor CY4, a fifth capacitor CX1, a sixth capacitor CX2 and a common mode inductor LC 1.
In this embodiment, the first port of the common mode interference signal cancellation circuit 2 is connected to the output end of the differential mode interference signal cancellation circuit 1, specifically:
the output terminal of the differential mode interference signal cancellation circuit 1 includes: a first output port and a second output port;
one end of the first capacitor CY1 is connected to the first output port, and one end of the second capacitor CY2 is connected to the second output port. One end of the first inductor LD1 is connected to the other end of the first capacitor CY1 and the other end of the second capacitor CY2, respectively; the other end of the first inductor LD1 is connected to the ground of the ac power supply.
A first input terminal of the common mode inductor LC1 is connected to the hot line of the ac power supply and a second input terminal of the common mode inductor LC1 is connected to the neutral line of the ac power supply. A first output terminal of the common mode inductor LC1 is connected to a first output port of the differential mode interference signal cancellation circuit 1, and a second output terminal of the common mode inductor LC1 is connected to a second output port of the differential mode interference signal cancellation circuit 1.
One end of the third capacitor CY3 is connected to the live line of the ac power supply, and the other end thereof is connected to the ground line of the ac power supply. One end of the fourth capacitor CY4 is connected to the zero line of the ac power supply, and the other end is connected to the ground line of the ac power supply.
One end of the fifth capacitor CX1 is connected to the live line of the ac power supply, and the other end thereof is connected to the neutral line of the ac power supply. One end of the sixth capacitor CX2 is connected to the first output terminal of the common mode inductor LC1, and the other end thereof is connected to the second output terminal of the common mode inductor LC 1.
In this embodiment, the fifth capacitor CX1 connected across the zero line and the live line of the power line may be, but is not limited to, a capacitor having a capacitance value ranging from 0.1uF to 3 uF. The sixth capacitance CX2 may be, but is not limited to, a capacitance having a capacitance value in the range of 0.1uF to 3 uF. The fifth capacitance CX1 and the sixth capacitance CX2 function to filter out differential mode interference signals.
In the present embodiment, the third capacitor CY3 is connected across the live line and the ground line of the power line, and the fourth capacitor CY4 is connected across the zero line and the ground line of the power line, which may be, but not limited to, capacitors with capacitance values ranging from 1uF to 10 uF. The third capacitor CY3 and the fourth capacitor CY4 function to filter out common mode interference signals.
The working principle of the embodiment is as follows: a first inductor LD1 formed by a small magnetic ring is connected in series with a ground wire connected with the first capacitor CY1 and the second capacitor CY2, so that noise signals from a load end are restrained, radiation interference of high-frequency signals on the ground wire is avoided, and a secondary common mode inductor is not needed. Because its volume ratio of common mode inductance is big than general inductance, and occupy great space on the circuit board, consequently pass through the utility model discloses a circuit structure improves, can reduce 1 common mode inductance, reduces the size of wave filter and the area of PCB board, saves cost optimization circuit structure.
In the embodiment, the inductance of the first inductor LD1 generally has a value range of less than 100uH, and the capacitance values of the first capacitor CY1 and the second capacitor CY2 have a value range of 1nF to 10 nF. And for different application scenarios or different variable frequency driving boards, the inductance value of the first inductor LD1 is increased, and the common mode can be filtered by increasing the capacitance value of CY3/CY 4. Therefore, the first capacitor CY1 and the second capacitor CY2 can be set as adjustable resistors to adapt to different models of products.
The embodiment of the utility model provides an air conditioner is still provided, and the air conditioner adopts foretell filter circuit.
The air conditioner can be, but is not limited to, a variable frequency air conditioner, a variable frequency mobile air conditioner.
Furthermore, the utility model discloses a filter circuit still is applicable to products such as frequency conversion window machine, frequency conversion dehumidifier.
To sum up, the utility model discloses only need set up single-stage common mode inductance, can eliminate the common mode signal of large component, reduced the volume of corresponding common mode inductance coil and circuit board, save the cost and optimize circuit structure.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.
Claims (8)
1. A filter circuit, comprising:
the input end of the differential mode interference signal eliminating circuit is connected with an alternating current power supply;
a first port of the common mode interference signal eliminating circuit is connected with an output end of the differential mode interference signal eliminating circuit, and a second port of the common mode interference signal eliminating circuit is connected with a grounding wire;
the input end of the rectifying circuit is connected with the output end of the differential mode interference signal eliminating circuit;
the common mode interference signal eliminating circuit is provided with a first inductor, a first capacitor and a second capacitor.
2. The filter circuit according to claim 1, wherein the first port of the common mode interference signal cancellation circuit is connected to the output of the differential mode interference signal cancellation circuit, and specifically:
the output end of the differential mode interference signal eliminating circuit comprises: a first output port and a second output port;
one end of the first capacitor is connected with the first output port, and one end of the second capacitor is connected with the second output port;
one end of the first inductor is connected with the other end of the first capacitor and the other end of the second capacitor respectively; the other end of the first inductor is connected with a ground wire of the alternating current power supply.
3. The filter circuit of claim 2, wherein the differential mode interference signal cancellation circuit comprises: the common-mode inductor comprises a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor and a common-mode inductor;
the first input end of the common mode inductor is connected with a live wire of the alternating current power supply, and the second input end of the common mode inductor is connected with a zero line of the alternating current power supply;
a first output end of the common mode inductor is connected with a first output port of the differential mode interference signal eliminating circuit, and a second output end of the common mode inductor is connected with a second output port of the differential mode interference signal eliminating circuit;
one end of the third capacitor is connected with a live wire of the alternating current power supply, and the other end of the third capacitor is connected with a ground wire of the alternating current power supply;
one end of the fourth capacitor is connected with a zero line of the alternating current power supply, and the other end of the fourth capacitor is connected with a ground wire of the alternating current power supply;
one end of the fifth capacitor is connected with the live wire of the alternating current power supply, and the other end of the fifth capacitor is connected with the zero line of the alternating current power supply;
one end of the sixth capacitor is connected with the first output end of the common mode inductor, and the other end of the sixth capacitor is connected with the second output end of the common mode inductor.
4. The filter circuit of claim 3, wherein the third capacitance is a capacitance having a value in the range of 1nF to 10 nF;
the fourth capacitance is a capacitance with a capacitance value ranging from 1nF to 10 nF.
5. The filter circuit of claim 3, wherein the fifth capacitor is a capacitor having a capacitance value in the range of 0.1uF to 3 uF.
6. The filter circuit of claim 3, wherein the sixth capacitor is a capacitor having a capacitance value in the range of 0.1uF to 3 uF.
7. The filter circuit of any of claims 1 to 6, wherein the first and second capacitors are adjustable capacitors.
8. An air conditioner, characterized by comprising the filter circuit according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020679971.4U CN212258769U (en) | 2020-04-27 | 2020-04-27 | Filter circuit and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020679971.4U CN212258769U (en) | 2020-04-27 | 2020-04-27 | Filter circuit and air conditioner |
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| Publication Number | Publication Date |
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| CN212258769U true CN212258769U (en) | 2020-12-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020679971.4U Active CN212258769U (en) | 2020-04-27 | 2020-04-27 | Filter circuit and air conditioner |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022017049A1 (en) * | 2020-07-22 | 2022-01-27 | 京东方科技集团股份有限公司 | Anti-power environment suppression circuit, touch screen, and touch display device |
| CN113991987A (en) * | 2021-11-03 | 2022-01-28 | 国网陕西省电力公司电力科学研究院 | Common-mode current detection and suppression system and working method thereof |
-
2020
- 2020-04-27 CN CN202020679971.4U patent/CN212258769U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022017049A1 (en) * | 2020-07-22 | 2022-01-27 | 京东方科技集团股份有限公司 | Anti-power environment suppression circuit, touch screen, and touch display device |
| CN113991987A (en) * | 2021-11-03 | 2022-01-28 | 国网陕西省电力公司电力科学研究院 | Common-mode current detection and suppression system and working method thereof |
| CN113991987B (en) * | 2021-11-03 | 2024-02-13 | 国网陕西省电力公司电力科学研究院 | Common mode current detection and suppression system and working method thereof |
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