CN203851107U - Filter circuit - Google Patents
Filter circuit Download PDFInfo
- Publication number
- CN203851107U CN203851107U CN201420094147.7U CN201420094147U CN203851107U CN 203851107 U CN203851107 U CN 203851107U CN 201420094147 U CN201420094147 U CN 201420094147U CN 203851107 U CN203851107 U CN 203851107U
- Authority
- CN
- China
- Prior art keywords
- capacitor
- electric capacity
- coil
- filter circuit
- filter
- 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.)
- Expired - Lifetime
Links
- 239000003990 capacitor Substances 0.000 claims abstract description 80
- 238000001914 filtration Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000035807 sensation Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Abstract
The utility model belongs to the technical field of electric power and electronic filtering technologies and specifically relates to a filter circuit. According to the filter circuit, a third Y capacitor is arranged on a ground wire; when a filter provided by the filter circuit is mounted on a household electrical appliance and is used when being electrified, the capacitance value of a Y capacitor is lowered to less than 2200pF and an overall leakage electric current of the household electrical appliance is lowered to less than 1.0 mA through additional arrangement of a Y capacitor or direct use of a two stage filter; good performance effects of EMI and EMS are realized.
Description
Technical field
The utility model belongs to power electronics technical field of filtering, relates in particular to a kind of filter circuit.
Background technology
Along with the raising of people's living standard, increasing household electrical appliances enter in family, and filter is mostly installed on household electrical appliances.As one-level filter being all installed on the household electrical appliances such as washing machine, refrigerator, air-conditioning.
The filter circuit of the filter that in prior art, household electrical appliances adopt generally as shown in Figure 1, this filter circuit is existing open in Chinese utility model patent CN 203340026 U, a kind of filter circuit for buffer controller electromagnetic interference that this patent provides, comprises the first power input, second source input, the first power output end, second source output, an X capacitor C X1, the 2nd X capacitor C X2, common mode inductance L, a Y capacitor C Y1 and the 2nd Y capacitor C Y2; Common mode inductance L comprises the first coil and the second coil; The first power input connects an one end of X capacitor C X1 and one end of the first coil; Second source input connects an other end of X capacitor C X1 and one end of the second coil; The other end of the first coil connects the 2nd X capacitor C X2 one end, a Y capacitor C Y1 one end and the first power output end; The other end of the second coil connects the 2nd X capacitor C X2 other end, the 2nd Y capacitor C Y2 one end and second source output; The one Y capacitor C Y1 other end and the 2nd Y capacitor C Y2 other end ground connection.
Use the filter of above-mentioned filter circuit can guarantee EMI and EMS performance, but the ceramic disc capacitor between its line ground is larger, leakage current is generally more than 1.0mA, earth connection is ignored sometimes in some place when using household electrical appliances, in use, hand touches electrical equipment surface and has electric shock feeling, more dangerous.
Utility model content
For addressing the above problem, the purpose of this utility model is to provide a kind of filter circuit, make it leakage current can either be reduced to below 1.0mA and EMI and EMS stable performance, while guaranteeing to use, there is no the sensation of electric shock, even also can guarantee personal safety in the situation of earth-free line.
The technical solution of the utility model is: a kind of filter circuit arranges the 3rd Y capacitor C Y3 on ground wire.
Optimize, comprise the first power input L, second source input N, the first power output end L ', second source output N ', an X capacitor C X1, the 2nd X capacitor C X2, the first common mode inductance L1, a Y capacitor C Y1 and the 2nd Y capacitor C Y2; The first common mode inductance L1 comprises the first coil P1 and the second coil P2; The first power input L connects an one end of X capacitor C X1 and one end of the first coil P1; Second source input connects an other end of X capacitor C X1 and one end of the second coil P2; The other end of the first coil P1 connects the 2nd X capacitor C X2 one end, a Y capacitor C Y1 one end and the first power output end L '; The other end of the second coil P2 connects the 2nd X capacitor C X2 other end, the 2nd Y capacitor C Y2 one end and second source output N '; The one Y capacitor C Y1 other end and the 2nd Y capacitor C Y2 other end are by the 3rd Y capacitor C Y3 ground connection.
Optimize, described filter circuit is two stage filter, and the 6th Y capacitor C Y6 is set on the ground wire between two stage filter.
Optimize, also comprise the second common mode inductance L2, the 4th Y capacitor C Y4 and the 5th Y capacitor C Y5, described the second common mode inductance L2 comprises tertiary coil P3 and the 4th coil P4, and one end of described the 4th Y capacitor C Y4 and tertiary coil P3 are connected between the first coil P1 and the 2nd X capacitor C X2 one end; One end of described the 5th capacitor C Y5 and the 4th coil P4 are connected between the second coil P2 and the other end of the 2nd X capacitor C X2; The other end of the other end of the 4th Y capacitor C Y4 and the 5th Y capacitor C Y5 is by the 6th Y capacitor C Y6 ground connection.
Optimize, the capacitance of six Y electric capacity is arranged on below 2200pF.
The beneficial effects of the utility model are: filter is arranged on household electrical appliances and switches on while using, by increasing and a Y electric capacity be set or directly use dual stage filter that Y electric capacity capacitance is reduced to below 2200pF on filter ground wire, the whole leakage current of household electrical appliances is reduced to below 1.0mA, and EMI and the EMS impact of performance are relatively good.
Accompanying drawing explanation
Fig. 1 is filter circuit schematic diagram in prior art;
Fig. 2 is the first execution mode schematic diagram of the utility model filter circuit;
Fig. 3 is the second execution mode schematic diagram of the utility model filter circuit.
L: the first power input; N: second source input; L ': the first power output end; N ': second source output; CX1: an X electric capacity; CX2: the 2nd X electric capacity; L1: the first common mode inductance; CY1: a Y electric capacity; CY2: the 2nd Y electric capacity; P1: the first coil; P2: the second coil; CY3: the 3rd Y electric capacity; L2: the second common mode inductance; CY4: the 4th Y electric capacity; CY5: the 5th Y electric capacity; CY6: the 6th Y electric capacity; P3: tertiary coil; P4: the 4th coil.
Embodiment
below by embodiment and accompanying drawing, illustrate the utility model.
Embodiment 1
A kind of filter circuit that the utility model provides arranges the 3rd Y capacitor C Y3 on ground wire.
Concrete the first power input L, second source input N, the first power output end L ', second source output N ', an X capacitor C X1, the 2nd X capacitor C X2, the first common mode inductance L1, a Y capacitor C Y1 and the 2nd Y capacitor C Y2 of comprising; The first common mode inductance L1 comprises the first coil P1 and the second coil P2; The first power input L connects an one end of X capacitor C X1 and one end of the first coil P1; Second source input connects an other end of X capacitor C X1 and one end of the second coil P2; The other end of the first coil P1 connects the 2nd X capacitor C X2 one end, a Y capacitor C Y1 one end and the first power output end L '; The other end of the second coil P2 connects the 2nd X capacitor C X2 other end, the 2nd Y capacitor C Y2 one end and second source output N '; The one Y capacitor C Y1 other end and the 2nd Y capacitor C Y2 other end are by the 3rd Y capacitor C Y3 ground connection.
Fig. 2 has provided this and has used first novel execution mode, compare with filter circuit of the prior art, on the ground wire of one-level filter, increase a Y electric capacity, the leakage current of whole filter is reduced to below 1.0mA, this scheme can improve the inductance value of inductance, makes up the reduction problem that capacitance reduces rear product filtering performance.The whole EMI of this scheme and EMS stability are good.
Embodiment 2
A kind of filter circuit that the present embodiment provides arranges the 3rd Y capacitor C Y3 on ground wire.
Concrete the first power input L, second source input N, the first power output end L ', second source output N ', an X capacitor C X1, the 2nd X capacitor C X2, the first common mode inductance L1, a Y capacitor C Y1 and the 2nd Y capacitor C Y2 of comprising; The first common mode inductance L1 comprises the first coil P1 and the second coil P2; The first power input L connects an one end of X capacitor C X1 and one end of the first coil P1; Second source input connects an other end of X capacitor C X1 and one end of the second coil P2; The other end of the first coil P1 connects the 2nd X capacitor C X2 one end, a Y capacitor C Y1 one end and the first power output end L '; The other end of the second coil P2 connects the 2nd X capacitor C X2 other end, the 2nd Y capacitor C Y2 one end and second source output N '; The one Y capacitor C Y1 other end and the 2nd Y capacitor C Y2 other end are by the 3rd Y capacitor C Y3 ground connection.
Described filter circuit is two stage filter, and the 6th Y capacitor C Y6 is set on the ground wire between two stage filter.
Concrete the second common mode inductance L2, the 4th Y capacitor C Y4 and the 5th Y capacitor C Y5 of also comprising, described the second common mode inductance L2 comprises tertiary coil P3 and the 4th coil P4, and one end of described the 4th Y capacitor C Y4 and tertiary coil P3 are connected between the first coil P1 and the 2nd X capacitor C X2 one end; One end of described the 5th capacitor C Y5 and the 4th coil P4 are connected between the second coil P2 and the other end of the 2nd X capacitor C X2; The other end of the other end of the 4th Y capacitor C Y4 and the 5th Y capacitor C Y5 is by the 6th Y capacitor C Y6 ground connection.
Wherein, the capacitance of six Y electric capacity is arranged on below 2200pF.
The difference of the present embodiment and embodiment 1 is, directly use dual stage filter, the Y capacitance of dual stage filter is all below 2200pF simultaneously, this scheme is in the whole frequency band of EMI and EMS filtration, all obtain good filter effect, the leakage current of filter is reduced in below 1.0mA simultaneously, has solved the large problem of filter leakage current in household electrical appliances.
Claims (5)
1. a filter circuit, is characterized in that: the 3rd Y electric capacity (CY3) is set on ground wire.
2. filter circuit according to claim 1, is characterized in that: comprise the first power input (L), second source input (N), the first power output end (L '), second source output (N '), an X capacitor C X1, the 2nd X capacitor C X2, the first common mode inductance (L1), a Y electric capacity (CY1) and the 2nd Y electric capacity (CY2); The first common mode inductance (L1) comprises the first coil (P1) and the second coil (P2); The first power input (L) connects one end of an X electric capacity (CX1) and one end of the first coil (P1); Second source input connects the other end of an X electric capacity (CX1) and one end of the second coil (P2); Other end connection the 2nd X electric capacity (CX2) one end, Y electric capacity (CY1) one end and first power output end of the first coil (P1) (L '); Other end connection the 2nd X electric capacity (CX2) other end, the 2nd Y electric capacity (CY2) one end and the second source output of the second coil (P2) (N '); The one Y electric capacity (CY1) other end and the 2nd Y electric capacity (CY2) other end are by the 3rd Y electric capacity (CY3) ground connection.
3. filter circuit according to claim 2, is characterized in that: described filter circuit is two stage filter, and the 6th Y electric capacity (CY6) is set on the ground wire between two stage filter.
4. filter circuit according to claim 3, it is characterized in that: also comprise the second common mode inductance (L2), the 4th Y electric capacity (CY4) and the 5th Y electric capacity (CY5), described the second common mode inductance (L2) comprises tertiary coil (P3) and the 4th coil (P4), and one end of described the 4th Y electric capacity (CY4) and tertiary coil (P3) are connected between the first coil (P1) and the 2nd X electric capacity (CX2) one end; One end of described the 5th electric capacity (CY5) and the 4th coil (P4) are connected between the second coil (P2) and the other end of the 2nd X electric capacity (CX2); The other end of the other end of the 4th Y electric capacity (CY4) and the 5th Y electric capacity (CY5) is by the 6th Y electric capacity (CY6) ground connection.
5. filter circuit according to claim 4, is characterized in that: the capacitance of six Y electric capacity is arranged on below 2200pF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420094147.7U CN203851107U (en) | 2014-03-04 | 2014-03-04 | Filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420094147.7U CN203851107U (en) | 2014-03-04 | 2014-03-04 | Filter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203851107U true CN203851107U (en) | 2014-09-24 |
Family
ID=51564074
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420094147.7U Expired - Lifetime CN203851107U (en) | 2014-03-04 | 2014-03-04 | Filter circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203851107U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105932975A (en) * | 2016-06-14 | 2016-09-07 | 安徽省宁国天成电工有限公司 | Complete filter unit for inhibiting radio-frequency interference of household refrigerator |
| CN106533153A (en) * | 2015-09-15 | 2017-03-22 | 广东美的生活电器制造有限公司 | Electromagnetic interference suppressing circuit of motor power and household electrical appliance |
| CN106992697A (en) * | 2017-05-09 | 2017-07-28 | 南阳理工学院 | A kind of improvement device of switch power source of industrial control computer |
| CN107528466A (en) * | 2016-06-20 | 2017-12-29 | 艾默生网络能源有限公司 | A kind of EMI filter circuit |
| CN110086444A (en) * | 2019-04-25 | 2019-08-02 | 中国汽车技术研究中心有限公司 | A kind of filter for vehicle-mounted terminal equipment power supply |
| CN112910247A (en) * | 2021-01-25 | 2021-06-04 | 珠海格力电器股份有限公司 | Filter device and refrigerator |
| US11374504B2 (en) | 2018-06-20 | 2022-06-28 | Mitsubishi Electric Corporation | Electric power converter |
-
2014
- 2014-03-04 CN CN201420094147.7U patent/CN203851107U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106533153A (en) * | 2015-09-15 | 2017-03-22 | 广东美的生活电器制造有限公司 | Electromagnetic interference suppressing circuit of motor power and household electrical appliance |
| CN105932975A (en) * | 2016-06-14 | 2016-09-07 | 安徽省宁国天成电工有限公司 | Complete filter unit for inhibiting radio-frequency interference of household refrigerator |
| CN107528466A (en) * | 2016-06-20 | 2017-12-29 | 艾默生网络能源有限公司 | A kind of EMI filter circuit |
| CN107528466B (en) * | 2016-06-20 | 2019-08-23 | 维谛技术有限公司 | A kind of EMI filter circuit |
| CN106992697A (en) * | 2017-05-09 | 2017-07-28 | 南阳理工学院 | A kind of improvement device of switch power source of industrial control computer |
| US11374504B2 (en) | 2018-06-20 | 2022-06-28 | Mitsubishi Electric Corporation | Electric power converter |
| CN110086444A (en) * | 2019-04-25 | 2019-08-02 | 中国汽车技术研究中心有限公司 | A kind of filter for vehicle-mounted terminal equipment power supply |
| CN112910247A (en) * | 2021-01-25 | 2021-06-04 | 珠海格力电器股份有限公司 | Filter device and refrigerator |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203851107U (en) | Filter circuit | |
| CN201436615U (en) | A uniphase non-bridge power factor correcting circuit | |
| CN203933387U (en) | A kind of for suppressing filter circuit and the air conditioner of electromagnetic interference | |
| CN205006654U (en) | Soybean milk machine | |
| CN101651408A (en) | Filtering module inhibiting common mode noise and differential mode noise | |
| CN203645532U (en) | Electromagnetic compatible filter circuit of high voltage part for new energy vehicle | |
| CN201528319U (en) | Differential mode enhanced low-pass filter | |
| CN201490718U (en) | Anti-interference circuit for protecting power network and electric appliance | |
| CN203554279U (en) | Novel filtering board | |
| CN204615632U (en) | A kind of low noise DC/DC converter | |
| CN104638903A (en) | Washing machine and interference suppression module thereof | |
| CN204652715U (en) | A kind of LED drive power of Electro Magnetic Compatibility | |
| CN208012228U (en) | A kind of supply unit of frequency conversion refrigerator | |
| CN204992574U (en) | Servo driver input Y condenser network | |
| CN205901696U (en) | Take multilevel filter subassembly of surge voltage suppression | |
| CN203632543U (en) | Washing machine and interference suppression module thereof | |
| CN201557052U (en) | Switch power source | |
| CN201450491U (en) | Alternating current two-section filter | |
| CN205174502U (en) | First shelves low -power lampblack absorber | |
| CN202617396U (en) | Induction cooker circuit | |
| CN205901301U (en) | Three -phase AC multilevel filter subassembly with high insertion loss | |
| CN205754270U (en) | A kind of input isolation circuit of numeric type | |
| CN103728889A (en) | Card type wall power-saving switch | |
| CN204180314U (en) | Electromagnetic Heating control circuit and electromagnetic heater | |
| CN201345609Y (en) | Energy-saving intelligent controller |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140924 |
|
| CX01 | Expiry of patent term |