CN207070030U - The power-supply filter that a kind of differential mode and common mode coexist - Google Patents
The power-supply filter that a kind of differential mode and common mode coexist Download PDFInfo
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- CN207070030U CN207070030U CN201720729969.1U CN201720729969U CN207070030U CN 207070030 U CN207070030 U CN 207070030U CN 201720729969 U CN201720729969 U CN 201720729969U CN 207070030 U CN207070030 U CN 207070030U
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Abstract
The utility model discloses the power-supply filter that a kind of differential mode and common mode coexist, the power-supply filter that the differential mode and common mode coexist includes differential mode inductance, common mode inductance, the first Cx electric capacity, the 2nd Cx electric capacity, the first Cy electric capacity, the 2nd Cy electric capacity and enamel-covered wire, and the first Cx electric capacity, the 2nd Cx electric capacity are connected the first low pass filter forming two separate ports after being in series with differential mode inductance；Closed-loop path the second low pass filter of composition that the first Cy electric capacity, the 2nd Cy electric capacity are formed after being in series with common mode inductance；Electric current is sent to the input of second low pass filter by the output end of first low pass filter.Utility model is simple in construction, it is reasonable in design, loss is small, noise is low, there is good frequency selective characteristic, using differential mode inductance and differential mode capacitor, common mode inductance forms independent low pass filter with common mode capacitance in same circuit and comes suppression common mode interference simultaneously and DM EMI.
Description
Technical field
It the utility model is related to wave filter technology field, and in particular to the power-supply filter that a kind of differential mode and common mode coexist.
Background technology
The filter circuit that power-supply filter is made up of electric capacity, inductance and resistance.Wave filter can be to specific in power line
Frequency beyond the frequency of frequency or the frequency is effectively filtered out, and obtains the power supply signal of a specific frequency, or eliminate one
Power supply signal after individual specific frequency.
The filter circuit that power-supply filter is made up of electric capacity, inductance and resistance, also known as " EMI power filter ", or "
EMI power-supply filters ", a kind of passive bidirectional network, its one end are power supplys, and the other end is load.The principle of power-supply filter
It is exactly a kind of impedance network:Power-supply filter input, outlet side and the impedance of power supply and load-side are bigger, to electromagnetism
The decay of interference is more effective.Wave filter can have to the frequency beyond the frequency or the frequency of specific frequency in power line
Effect filters out, and obtains the power supply signal of a specific frequency, or eliminate the power supply signal after a specific frequency.
Power-supply filter is a kind of passive bidirectional network, and its one end is power supply, and the other end is load.Power-supply filter
Principle is exactly a kind of impedance network：Power-supply filter input, outlet side and the impedance of power supply and load-side are bigger, right
The decay of electromagnetic interference is more effective.
For the wave filter used in screened room according to its frequency characteristic generally use low pass filter, it is by inductance and electric capacity structure
Into making it to provide common mode disturbances and DM EMI larger decay in stopband；It is past in power line in practical application
Toward common mode and DM EMI be present simultaneously, the generally below interference of 1MHz frequencies is based on differential mode, higher than the interference of 1MHz frequencies
Based on common mode.
Utility model content
The purpose of this utility model is in view of the above-mentioned problems, providing a kind of differential mode for having a good frequency selective characteristic and altogether
The power-supply filter that mould coexists.
To reach above-mentioned purpose, the utility model employs following technical proposal：A kind of differential mode of the present utility model and altogether
The power-supply filter that the power-supply filter that mould coexists, the differential mode and common mode coexist includes differential mode inductance, common mode inductance, the first Cx
Electric capacity, the 2nd Cx electric capacity, the first Cy electric capacity, the 2nd Cy electric capacity and enamel-covered wire,
The differential mode inductance is made up of the L3 coils, L4 coils and ferrocart core of enamel-covered wire, and the common mode inductance is by enamel-covered wire
L1 coils, L2 coils and the ferrite bead composition of winding,
The first Cx electric capacity, the 2nd Cx electric capacity are connected after being in series with differential mode inductance to form two separate ports
First low pass filter；The first Cy electric capacity, the 2nd Cy electric capacity are formed after being in series with the closed-loop path that common mode inductance is formed
Second low pass filter；Electric current is sent to the input of second low pass filter by the output end of first low pass filter
End.
Further, the first Cx electric capacity, the 2nd Cx electric capacity, L4 coils and L3 coils form closed-loop path and form first
Low pass filter；The first Cy electric capacity, the 2nd Cy electric capacity, L1 coils and L2 coils form closed-loop path and form the second low pass filtered
Ripple device.
Further, the L4 coils and L3 coils are symmetrically arranged on ferrocart core；The L1 coils and L2 coils
It is symmetricly set on ferrite bead.
Further, the first Cy electric capacity and the 2nd Cy electric capacity are connected to be formed after being in series with L1 coils and L2 coils
The second low pass filter two separate ports.
Further, the first Cx electric capacity, the 2nd Cx electric capacity, L4 coils and L3 coils form closed-loop path and form first
Low pass filter.
Further, the L1 coils, L2 coils are wound on two absolute coils on same ferrocart core, institute for enamel-covered wire
It is identical with the number of turn of L2 coils to state L1 coils, there is the Same Name of Ends of equidirectional.
Beneficial effect：Utility model is simple in construction, reasonable in design, loss is small, noise is low, has good frequency selection special
Property, using differential mode inductance and differential mode capacitor, common mode inductance forms independent low pass filter with common mode capacitance in same circuit
Suppression common mode interference simultaneously and DM EMI.
Compared with prior art, the utility model has the following advantages that：
（1）The low pass filter that the Cy electric capacity and common mode inductance are formed, can suppress common mode disturbances present on power line
Signal, it is allowed to decay.
（2）The low pass filter that the Cx electric capacity and differential mode inductance are formed, can suppress DM EMI present on power line
Signal.
（3）Using differential mode inductance and differential mode capacitor, common mode inductance forms independent low pass with common mode capacitance in same circuit
Wave filter comes suppression common mode interference simultaneously and DM EMI.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the required accompanying drawing used is briefly described in description of the prior art, it should be apparent that, drawings in the following description are only
It is some embodiments of the utility model, for those of ordinary skill in the art, before creative labor is not paid
Put, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is electrical block diagram of the present utility model.
Wherein, 1L1 coils, 2 L3 coils, 3 the oneth Cx electric capacity, 4 the 2nd Cy electric capacity, 5 L4 coils, 6 L2 coils, 7 first
Cy electric capacity, 8 the 2nd Cx electric capacity.
Embodiment
In order to illustrate the technical solution of the utility model and technical purpose, below in conjunction with the accompanying drawings and embodiment is to this
Utility model is described further.
Embodiment
As shown in figure 1, the power-supply filter that a kind of differential mode of the present utility model and common mode coexist, the differential mode and common mode are total to
The power-supply filter deposited includes differential mode inductance, common mode inductance, the first Cx electric capacity 3, the 2nd Cx electric capacity 8, the first Cy electric capacity 7, second
Cy electric capacity 4 and enamel-covered wire,
The first Cx electric capacity 3, the 2nd Cx electric capacity 8 are connected after being in series with differential mode inductance to form two separate ports
The first low pass filter；DM EMI signal present on power line can be suppressed.
The differential mode inductance is made up of the L3 coils 2, L4 coils 5 and ferrocart core of enamel-covered wire,
The first Cy electric capacity 7, the 2nd Cy electric capacity 4 are low with the closed-loop path composition second that common mode inductance is formed after being in series
Bandpass filter；Common mode interference signal present on power line can be suppressed, be allowed to decay.
L1 coils 1, L2 coils 6 and the ferrite bead that the common mode inductance is wound by enamel-covered wire form,
Electric current is sent to the input of second low pass filter by the output end of first low pass filter.
The first Cx electric capacity 3, the 2nd Cx electric capacity 8, L4 coils 5 and L3 coils 2 form closed-loop path and form the first low pass
Wave filter；The first Cy electric capacity 7, the 2nd Cy electric capacity 4, L1 coils 1 and L2 coils 6 form closed-loop path and form the second low pass filtered
Ripple device.
The L4 coils 5 and L3 coils 2 are symmetrically arranged on ferrocart core；The L1 coils 1 and L2 coils 6 are symmetrically set
Put on ferrite bead.
The first Cy electric capacity 7 and the 2nd Cy electric capacity 4 are connected to form two pairs after being in series with L1 coils 1 and L2 coils 6
The second low pass filter between separate port.Common mode interference signal present on power line can be suppressed, be allowed to decay.
The first Cx electric capacity 3, the 2nd Cx electric capacity 8, L4 coils 5 and L3 coils 2 form closed-loop path and form the first low pass
Wave filter.DM EMI signal present on power line can be suppressed.
The L1 coils 1, L2 coils 6 are wound on two absolute coils on same ferrocart core, the L1 coils 1 for enamel-covered wire
It is identical with the number of turn of L2 coils 6, there is the Same Name of Ends of equidirectional.
The advantages of general principle of the present utility model, principal character and the utility model has been shown and described above.One's own profession
The technical staff of industry is it should be appreciated that the utility model is not restricted to the described embodiments, described in above-described embodiment and specification
Simply illustrate principle of the present utility model, on the premise of the spirit and scope of the utility model is not departed from, the utility model is also
Various changes and modifications are had, the utility model requires protection scope is by appended claims, specification and its equivalent
Define.
Claims (6)
- A kind of 1. power-supply filter that differential mode and common mode coexist, it is characterised in that：The power filter that the differential mode and common mode coexist Device includes differential mode inductance, common mode inductance, the first Cx electric capacity（3）, the 2nd Cx electric capacity（8）, the first Cy electric capacity（7）, the 2nd Cy electric capacity （4）And enamel-covered wire,The differential mode inductance by enamel-covered wire L3 coils（2）, L4 coils（5）Formed with ferrocart core, the common mode inductance（1）By painting The L1 coils of envelope curve winding（1）, L2 coils（6）Formed with ferrite bead,The first Cx electric capacity（3）, the 2nd Cx electric capacity（8）It is connected after being in series with differential mode inductance forming two separate ports The first low pass filter；The first Cy electric capacity（7）, the 2nd Cy electric capacity（4）The closure formed after being in series with common mode inductance Loop forms the second low pass filter；Electric current is sent to second LPF by the output end of first low pass filter The input of device.
- 2. the power-supply filter that differential mode and common mode coexist according to claim 1, it is characterised in that：The first Cx electric capacity （3）, the 2nd Cx electric capacity（8）, L4 coils（5）With L3 coils（2）Form closed-loop path and form the first low pass filter；Described first Cy electric capacity（7）, the 2nd Cy electric capacity（4）, L1 coils（1）With L2 coils（6）Form closed-loop path and form the second low pass filter.
- 3. the power-supply filter that differential mode and common mode coexist according to claim 2, it is characterised in that：The L4 coils（5）With L3 coils（2）Symmetrically it is arranged on ferrocart core；The L1 coils（1）With L2 coils（6）It is symmetricly set on ferrite bead On.
- 4. the power-supply filter that differential mode and common mode coexist according to claim 3, it is characterised in that：The first Cy electric capacity （7）With the 2nd Cy electric capacity（4）After being in series with L1 coils（1）With L2 coils（6）Be connected forming two separate ports Two low pass filters.
- 5. the power-supply filter that differential mode and common mode coexist according to claim 4, it is characterised in that：The first Cx electric capacity （3）, the 2nd Cx electric capacity（8）, L4 coils（5）With L3 coils（2）Form closed-loop path and form the first low pass filter.
- 6. the power-supply filter coexisted according to any one of claim 1 to 5 differential mode and common mode, it is characterised in that：The L1 Coil（1）, L2 coils（6）Two absolute coils being wound on for enamel-covered wire on same ferrocart core, the L1 coils（1）With L2 coils （6）The number of turn it is identical, have the Same Name of Ends of equidirectional.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720729969.1U CN207070030U (en) | 2017-06-22 | 2017-06-22 | The power-supply filter that a kind of differential mode and common mode coexist |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720729969.1U CN207070030U (en) | 2017-06-22 | 2017-06-22 | The power-supply filter that a kind of differential mode and common mode coexist |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110943608A (en) * | 2018-09-21 | 2020-03-31 | 中车株洲电力机车研究所有限公司 | EMI filter for motor driver |
| CN112303806A (en) * | 2020-10-19 | 2021-02-02 | 青岛海信日立空调系统有限公司 | Communication circuit and air conditioner |
| CN112994440A (en) * | 2021-02-04 | 2021-06-18 | 珠海格力电器股份有限公司 | Electromagnetic interference suppression device and method of power adapter and power adapter |
-
2017
- 2017-06-22 CN CN201720729969.1U patent/CN207070030U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110943608A (en) * | 2018-09-21 | 2020-03-31 | 中车株洲电力机车研究所有限公司 | EMI filter for motor driver |
| CN112303806A (en) * | 2020-10-19 | 2021-02-02 | 青岛海信日立空调系统有限公司 | Communication circuit and air conditioner |
| CN112303806B (en) * | 2020-10-19 | 2023-11-17 | 青岛海信日立空调系统有限公司 | Communication circuit and air conditioner |
| CN112994440A (en) * | 2021-02-04 | 2021-06-18 | 珠海格力电器股份有限公司 | Electromagnetic interference suppression device and method of power adapter and power adapter |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200708 Address after: Building 6, no.6, Nenjiang Road, Tianmuhu Town, Liyang City, Changzhou City, Jiangsu Province Patentee after: Jiangsu wamuke Electronic Technology Co., Ltd Address before: 213300 Nenjiang Road, Tianmu Town, Changzhou City, Jiangsu, Liyang province 6 Patentee before: JIANGSU WEMC TECHNOLOGY Co.,Ltd. |
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| TR01 | Transfer of patent right |