CN207459727U - A kind of filter circuit - Google Patents
A kind of filter circuit Download PDFInfo
- Publication number
- CN207459727U CN207459727U CN201721417490.0U CN201721417490U CN207459727U CN 207459727 U CN207459727 U CN 207459727U CN 201721417490 U CN201721417490 U CN 201721417490U CN 207459727 U CN207459727 U CN 207459727U
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- common mode
- capacitance
- capacitor
- coil
- varistor
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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 discloses a kind of filter circuit, the filter circuit is arranged between power grid and electrical equipment, including the first codan and the second codan；First codan includes the first common mode inductance, the first differential mode capacitor, the first common mode capacitance and the second common mode capacitance, and first common mode inductance includes first coil and the second coil；Second codan includes the second common mode inductance, the second differential mode capacitor, the 3rd differential mode capacitor, the 3rd common mode capacitance and the 4th common mode capacitance, and second common mode inductance includes tertiary coil and the 4th coil；The utility model can be disturbed with suppression common mode and DM EMI, improves the Electro Magnetic Compatibility of filter circuit；The size of safety leakage current can also be reduced.
Description
Technical field
The utility model is related to the anti-tampering field of power grid, especially a kind of filter circuit.
Background technology
Usually, for electrical equipment is avoided to impact power grid, protection can be set to fill between electrical equipment and power grid
Put the electromagnetic noise for reducing electrical equipment, avoid influence power grid normal work, usually using filter circuit as protect
Device reduces the electromagnetic noise of electrical equipment input power grid, but filter circuit currently on the market, Electro Magnetic Compatibility are poor；When connecing
When the network voltage entered is excessive, the safety leakage current of filter circuit is excessive.
Utility model content
In order to solve the above-mentioned technical problem, the purpose of this utility model is to provide a kind of filter circuit, is filtered for improving
The Electro Magnetic Compatibility of circuit and the safety leakage current for reducing filter circuit.
Technical solution is used by the utility model：A kind of filter circuit, the filter circuit are arranged on power grid with using
Between electric equipment, including the first codan and the second codan；
First codan includes the first common mode inductance, the first differential mode capacitor, the first common mode capacitance and second
Common mode capacitance, first common mode inductance include first coil and the second coil；First differential mode capacitor connects with the power grid
It connects；One end of first differential mode capacitor is connected with one end of the first coil, the other end of first differential mode capacitor with
One end connection of second coil；The other end of the first coil is connected with one end of the first common mode capacitance, and described second
The other end of coil is connected with one end of the second common mode capacitance, the other end of first common mode capacitance, the second common mode capacitance
The other end is grounded；
Second codan is total to including the second common mode inductance, the second differential mode capacitor, the 3rd differential mode capacitor, the 3rd
Mould capacitance and the 4th common mode capacitance, second common mode inductance include tertiary coil and the 4th coil；Second differential mode capacitor
One end be connected with one end of first common mode capacitance, the other end of second differential mode capacitor and the one of the second common mode capacitance
End connection；One end of second differential mode capacitor and one end of tertiary coil connect, the other end of second differential mode capacitor with
One end connection of 4th coil；The other end of the tertiary coil is connected with one end of the 3rd differential mode capacitor, the 4th coil
The other end be connected with the other end of the 3rd differential mode capacitor；One end of 3rd differential mode capacitor and one end of the 3rd common mode capacitance
Connection, the other end of the 3rd differential mode capacitor is connected with one end of the 4th common mode capacitance, the 3rd common mode capacitance it is another
End, the other end ground connection of the 4th common mode capacitance；One end of 3rd common mode capacitance, one end of the 4th common mode capacitance are as filtering
The output terminal of circuit.
Further, first codan further includes the first varistor, first varistor and
One differential mode capacitor is connected in parallel.
Further, second codan further includes the second varistor, second varistor and
Three differential mode capacitors are connected in parallel.
Further, the filter circuit further includes discharge circuit, and the output terminal of second codan is with putting
The input terminal connection of circuit, the output head grounding of the discharge circuit.
Further, the discharge circuit includes first resistor, second resistance, the 3rd varistor, the 4th varistor
With the 5th varistor；One end of 3rd differential mode capacitor and one end of first resistor, one end of the 4th varistor connect,
The other end of the first resistor and one end connection of second resistance, the other end of the second resistance and the 3rd differential mode capacitor
One end connection of the other end, the 3rd varistor, the other end of the 3rd varistor and the other end of the 4th varistor,
One end connection of 5th varistor, the other end ground connection of the 5th varistor.
Further, first common mode inductance is amorphous common mode inductance.
Further, second common mode inductance is MnZn common mode inductance.
Further, first common mode capacitance, the second common mode capacitance, the 3rd common mode capacitance and the 4th common mode capacitance is total
Capacitance is less than 10nF.
The beneficial effects of the utility model are：
A kind of filter circuit of the utility model, including the first codan and the second codan；First is dry
Disturbing suppression circuit includes the first common mode inductance, the first differential mode capacitor, the first common mode capacitance and the second common mode capacitance, the second interference suppression
Circuit processed includes the second common mode inductance, the second differential mode capacitor, the 3rd differential mode capacitor, the 3rd common mode capacitance and the 4th common mode capacitance,
With suppression common mode interference and DM EMI, the Electro Magnetic Compatibility of filter circuit can be improved；The size of safety leakage current can also be reduced.
Description of the drawings
Specific embodiment of the present utility model is described further below in conjunction with the accompanying drawings：
Fig. 1 is an a kind of specific embodiment circuit diagram of filter circuit of the utility model.
Specific embodiment
It should be noted that in the case where there is no conflict, the feature in embodiment and embodiment in the application can phase
Mutually combination.
A kind of filter circuit, filter circuit are arranged between power grid and electrical equipment, and with reference to figure 1, Fig. 1 is the utility model
A kind of one specific embodiment circuit diagram of filter circuit, in the present embodiment, network voltage 220V passes through connector J1 access filters
Wave circuit, and pass through connector J2 and be connected with electrical equipment.Electromagnetic noise (i.e. disturbance voltage) is inputted from right side, filtered electricity
It is output on the left of Lu Houcong among public electric wire net；By sealing in filter circuit between electrical equipment and public electric wire net, using point
Pressure principle divides disturbance voltage, and the noise in left side is significantly reduced；In addition, usually, electrical equipment is included electricity
Net voltage conversion into different voltages size circuit, to match different electrical equipments；Specifically, it is dry to include first for filter circuit
Disturb suppression circuit and the second codan；
First codan includes the first common mode inductance L1, the first differential mode capacitor CM1, the first common mode capacitance C1 and the
Two common mode capacitance C2, the first common mode inductance L1 include first coil and the second coil；First differential mode capacitor CM1 is connected with power grid；
One end of first differential mode capacitor CM1 and one end of first coil connect, the other end of the first differential mode capacitor CM1 and the second coil
One end connects；The other end of first coil is connected with one end of the first common mode capacitance C1, and the other end of the second coil and second is total to
One end connection of mould capacitance C2, the other end of the first common mode capacitance C1, the other end ground connection of the second common mode capacitance C2；
Second codan includes the second common mode inductance L2, the second differential mode capacitor CM2, the 3rd differential mode capacitor CM3, the
Three common mode capacitance C3 and the 4th common mode capacitance C4, the second common mode inductance L2 include tertiary coil and the 4th coil；Second differential mode electricity
The one end for holding CM2 is connected with one end of the first common mode capacitance C1, the other end of the second differential mode capacitor CM2 and the second common mode capacitance C2
One end connection；One end of second differential mode capacitor CM2 and one end of tertiary coil connect, the other end of the second differential mode capacitor CM2
It is connected with one end of the 4th coil；The other end of tertiary coil is connected with one end of the 3rd differential mode capacitor CM3, the 4th coil it is another
One end is connected with the other end of the 3rd differential mode capacitor CM3；One end of 3rd differential mode capacitor CM3 and one end of the 3rd common mode capacitance C3
Connection, the other end of the 3rd differential mode capacitor CM3 are connected with one end of the 4th common mode capacitance C4, and the 3rd common mode capacitance C3's is another
End, the other end ground connection of the 4th common mode capacitance C4；One end of 3rd common mode capacitance C3, one end of the 4th common mode capacitance C4 are as filter
The output terminal of wave circuit.
Wherein, with reference to figure 1, harassed for the common mode of Electromagnetic Launching, pass through the first common mode capacitance C1, the second common mode capacitance
C2, the 3rd common mode capacitance C3 and the 4th common mode capacitance C4 realize protection；It is harassed for the differential mode of Electromagnetic Launching, utilizes the first differential mode
Capacitance CM1, the second differential mode capacitor CM2 and the 3rd differential mode capacitor CM3 can realize protection；Common mode inductance is big, and common mode capacitance is small, always
Common mode sensibility reciprocal is more than 100mH, the first common mode capacitance C1, the second common mode capacitance C2, the 3rd common mode capacitance C3 and the 4th common mode capacitance
Total capacitance of C4 is less than 10nF, not only increases the Electro Magnetic Compatibility of filter circuit；The size of safety leakage current can also be reduced, this
The filter circuit of utility model can meet 220VAC/50Hz simultaneously, and leakage current is no more than 5mA and 1500VAC/ in 5 seconds
50Hz, leakage current is no more than the safety leakage current requirement of 5mA in 5 seconds.In addition, the first common mode inductance L1 is amorphous common mode inductance,
Amorphous common mode inductance is using common mode inductance made of non-crystalline material, can filter out noise of the frequency range in 10KHz~500KHz；The
Two common mode inductance L2 are MnZn common mode inductance, and MnZn common mode inductance is using common mode inductance made of MnZn material, can be filtered out
Frequency range is in the electromagnetic noise of 500KHz~10MHz.Two common mode inductances of MnZn material and non-crystalline material are used to filter out simultaneously
10KHz~10MHz, using the first common mode capacitance C1, the second common mode capacitance C2, the 3rd common mode capacitance C3 and the 4th common mode capacitance C4
Total capacitance be less than 10nF can filter out 10MHz~300MHz noises；Therefore, the filter circuit of the utility model can filter out
The electromagnetic noise of 10KHZ~300MHz.
As being further improved for technical solution, with reference to figure 1, the first codan further includes the first varistor
MOV1, the first varistor MOV1 are connected in parallel with the first differential mode capacitor CM1.It is pressure-sensitive that second codan further includes second
Resistance MOV2, the second varistor MOV2 and the 3rd differential mode capacitor CM3 are connected in parallel.First varistor MOV1 and second is pressure-sensitive
Resistance MOV2 is used to carry out voltage clamping protection to the surge voltage in public electric wire net, prevents that connect electrical equipment from being raised suddenly
Surge voltage damaged, influence the normal work of electrical equipment.
As being further improved for technical solution, filter circuit further includes discharge circuit, the second codan it is defeated
The input terminal of outlet and discharge circuit connects, the output head grounding of discharge circuit.With reference to figure 1, discharge circuit includes first resistor
R1, second resistance R2, the 3rd varistor MOV3, the 4th varistor MOV4 and the 5th varistor MOV5；3rd differential mode electricity
Hold CM3 one end be connected with one end of first resistor R1, one end of the 4th varistor MOV4, the other end of first resistor R1 and
The other end, the 3rd varistor of one end connection of second resistance R2, the other end of second resistance R2 and the 3rd differential mode capacitor CM3
One end connection of MOV3, the other end of the 3rd varistor MOV3 and the other end, the 5th pressure-sensitive electricity of the 4th varistor MOV4
Hinder one end connection of MOV5, the other end ground connection of the 5th varistor MOV5.Wherein, the 3rd varistor MOV3, the 4th pressure-sensitive
Resistance MOV4 and the 5th varistor MOV5 is used to carry out voltage clamping protection to the surge voltage in public electric wire net；First resistor
R1 and second resistance R2 is the discharge resistance for safety shock hazard, will be residual in the 3rd differential mode capacitor CM3 for after a loss of power
The charge discharging resisting stayed falls.
The above are implementing to be illustrated to the preferable of the utility model, but the invention is not limited to the reality
Example is applied, those skilled in the art can also make a variety of equivalent variations on the premise of without prejudice to the utility model spirit
Or replace, these equivalent deformations or replacement are all contained in the application claim limited range.
Claims (8)
1. a kind of filter circuit, the filter circuit is arranged between power grid and electrical equipment, which is characterized in that dry including first
Disturb suppression circuit and the second codan；
First codan includes the first common mode inductance, the first differential mode capacitor, the first common mode capacitance and the second common mode
Capacitance, first common mode inductance include first coil and the second coil；First differential mode capacitor is connected with the power grid；Institute
The one end for stating the first differential mode capacitor is connected with one end of the first coil, the other end of first differential mode capacitor and described the
One end connection of two coil；The other end of the first coil is connected with one end of the first common mode capacitance, second coil
The other end is connected with one end of the second common mode capacitance, the other end, the other end of the second common mode capacitance of first common mode capacitance
Ground connection；
Second codan includes the second common mode inductance, the second differential mode capacitor, the 3rd differential mode capacitor, the 3rd common mode electricity
Hold and the 4th common mode capacitance, second common mode inductance include tertiary coil and the 4th coil；The one of second differential mode capacitor
End is connected with one end of first common mode capacitance, and the other end of second differential mode capacitor and one end of the second common mode capacitance connect
It connects；One end of second differential mode capacitor and one end of tertiary coil connect, the other end and the 4th of second differential mode capacitor
One end connection of coil；The other end of the tertiary coil is connected with one end of the 3rd differential mode capacitor, the 4th coil it is another
One end is connected with the other end of the 3rd differential mode capacitor；One end of 3rd differential mode capacitor connects with one end of the 3rd common mode capacitance
It connecing, the other end of the 3rd differential mode capacitor is connected with one end of the 4th common mode capacitance, the other end of the 3rd common mode capacitance,
The other end ground connection of 4th common mode capacitance；One end of 3rd common mode capacitance, one end of the 4th common mode capacitance are as filtered electrical
The output terminal on road.
2. filter circuit according to claim 1, which is characterized in that first codan further includes the first pressure
Quick resistance, first varistor are connected in parallel with the first differential mode capacitor.
3. filter circuit according to claim 1, which is characterized in that second codan further includes the second pressure
Quick resistance, second varistor are connected in parallel with the 3rd differential mode capacitor.
4. filter circuit according to claim 1, which is characterized in that the filter circuit further includes discharge circuit, described
The output terminal of second codan and the input terminal of discharge circuit connect, the output head grounding of the discharge circuit.
5. filter circuit according to claim 4, which is characterized in that the discharge circuit includes first resistor, the second electricity
Resistance, the 3rd varistor, the 4th varistor and the 5th varistor；One end of 3rd differential mode capacitor and first resistor
One end, one end connection of the 4th varistor, the other end of the first resistor and one end of second resistance connect, and described second
The other end of resistance is connected with the other end of the 3rd differential mode capacitor, one end of the 3rd varistor, the 3rd varistor
The other end is connected with the other end of the 4th varistor, one end of the 5th varistor, the other end of the 5th varistor
Ground connection.
6. filter circuit according to any one of claims 1 to 5, which is characterized in that first common mode inductance is amorphous
Common mode inductance.
7. filter circuit according to any one of claims 1 to 5, which is characterized in that second common mode inductance is MnZn
Common mode inductance.
8. filter circuit according to any one of claims 1 to 5, which is characterized in that first common mode capacitance, second are total to
Total capacitance of mould capacitance, the 3rd common mode capacitance and the 4th common mode capacitance is less than 10nF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721417490.0U CN207459727U (en) | 2017-10-27 | 2017-10-27 | A kind of filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721417490.0U CN207459727U (en) | 2017-10-27 | 2017-10-27 | A kind of filter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207459727U true CN207459727U (en) | 2018-06-05 |
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ID=62282596
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721417490.0U Active CN207459727U (en) | 2017-10-27 | 2017-10-27 | A kind of filter circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207459727U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109600035A (en) * | 2018-12-20 | 2019-04-09 | 郑州云海信息技术有限公司 | A kind of power module |
-
2017
- 2017-10-27 CN CN201721417490.0U patent/CN207459727U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109600035A (en) * | 2018-12-20 | 2019-04-09 | 郑州云海信息技术有限公司 | A kind of power module |
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