CN106026634A - Anti-electromagnetic interference filtering circuit - Google Patents
Anti-electromagnetic interference filtering circuit Download PDFInfo
- Publication number
- CN106026634A CN106026634A CN201610586708.9A CN201610586708A CN106026634A CN 106026634 A CN106026634 A CN 106026634A CN 201610586708 A CN201610586708 A CN 201610586708A CN 106026634 A CN106026634 A CN 106026634A
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- Prior art keywords
- common mode
- circuit
- input
- filter circuit
- electromagnetism interference
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Filters And Equalizers (AREA)
Abstract
The invention provides an anti-electromagnetic interference filtering circuit, which comprises a filtering circuit and a rectifying circuit, wherein an output end of the filtering circuit is connected with an input end of the rectifying circuit. The anti-electromagnetic interference filtering circuit is characterized by further comprising a first EMI suppression circuit, wherein an input end of the first EMI suppression circuit is connected with AC input, an output end of the first EMI suppression circuit is connected with an input end of the filtering circuit, the first EMI suppression circuit comprises a first common-mode inductor LF1, a first common-mode capacitor CY1 and a second common-mode capacitor CY2, a first input end of the first common-mode inductor LF1 is connected with a phase line of the AC input, a second input end of the first common-mode inductor LF1 is connected with a null line of the AC input, the first common-mode capacitor CY1 is in bridge connection between a first output end of the first common-mode inductor LF1 and the ground, and the second common-mode capacitor CY2 is in bridge connection between a second output end of the first common-mode inductor LF1 and the ground. The anti-electromagnetic interference filtering circuit improves the EMI suppression effect, the circuit structure is simple, and the cost is reduced.
Description
Technical field
The present invention relates to technical field of filtering, particularly relate to the filter circuit of a kind of electromagnetism interference.
Background technology
Along with developing rapidly of modern science and technology, the application of electronics, power electronics, electrical equipment is more and more wider
General, they the be in operation high density that produces, electromagnetic signals of wide spectrum are full of whole space, define multiple
Miscellaneous electromagnetic environment.Complicated electromagnetic environment requirements electronic equipment and power supply have higher Electro Magnetic Compatibility.
Then the technology suppressing electromagnetic interference the most increasingly comes into one's own.
Existing electromagnetism anti-jamming circuit is relatively complicated, takies pcb board area relatively big, is unfavorable for reducing
Pcb board area and cost savings.
Summary of the invention
The present invention provides the filter circuit of a kind of electromagnetism interference, improves EMI inhibition, circuit structure
Simply, cost is reduced.
The present invention is by the following technical solutions:
First aspect, the present invention provides the filter circuit of a kind of electromagnetism interference, including filter circuit and rectification
Circuit, the outfan of described filter circuit is connected with the input of described rectification circuit, also includes an EMI
Suppression circuit, the input of a described EMI suppression circuit and AC exchange input is connected, its outfan and
The input of described filter circuit connects, a described EMI suppression circuit include the first common mode inductance LF1,
First common mode capacitance CY1 and the second common mode capacitance CY2, the first input end of described first common mode inductance LF1
Being connected with the phase line of described AC exchange input, its second input is connected with the zero line of described AC exchange input,
Described first common mode capacitance CY1 is connected across between the first outfan and the ground of described first common mode inductance LF1,
Described second common mode capacitance CY2 is connected across between the second outfan and the ground of described first common mode inductance LF1.
Exemplarily, described filter circuit includes the first differential mode capacitor CX1, the second common mode inductance LF2 and
Two differential mode capacitor CX2, the two ends of described first differential mode capacitor CX1 respectively with described second common mode inductance LF2
Two inputs connect, described second differential mode capacitor CX2 respectively with described second common mode inductance LF2's
Two outfans connect.
Exemplarily, the 2nd EMI suppression electricity being arranged between described filter circuit and rectification circuit is also included
Road.
Further, described 2nd EMI suppression circuit includes the 3rd common mode capacitance CY3 and the 4th common mode capacitance
CY4, described 3rd common mode capacitance CY3 is connected across between described second differential mode capacitor CX2 one end and ground, institute
State between the other end and the ground that the 4th common mode capacitance CY4 is connected across described second differential mode capacitor CX2.
Preferably, between first input end and second input of described first common mode inductance LF1, bridging has one
Varistor TNR.
Preferably, also include that a critesistor TH, described critesistor TH are connected to described 3rd common mode electricity
Between resistance CY3 and connection end and the described rectification circuit of described second differential mode capacitor CX2.
Specifically, the Capacity Selection scope of described first common mode capacitance CY1 and the second common mode capacitance CY2 is
22pF to 100pF.
Specifically, the sensibility reciprocal range of choice of described first common mode inductance LF1 is 1uH to 500uH.
Specifically, the sensibility reciprocal of described second common mode inductance LF2 is more than 1mH.
Preferably, second input of described first common mode inductance LF1 exchanges the zero line of input with described AC
Between be provided with electric fuse.
The technical scheme that the present invention provides brings following beneficial effect:
Increase by an EMI suppression circuit, an EMI suppression circuit include the first common mode inductance LF1,
One common mode capacitance CY1 and the second common mode capacitance CY2, filtered the interference of low-frequency range, reduced rectification circuit
The EMI that the on-off circuit of back the produces impact on electrical network.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, the embodiment of the present invention will be retouched below
In stating, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only
Some embodiments of the present invention, for those of ordinary skill in the art, are not paying creative work
Under premise, it is also possible to content according to embodiments of the present invention and these accompanying drawings obtain other accompanying drawing.
Fig. 1 is the filter circuit construction block diagram of the electromagnetism interference that the present invention provides.
Fig. 2 is the filter circuit schematic diagram of the electromagnetism interference that the present invention provides.
Fig. 3 is the filter circuit construction block diagram of another electromagnetism interference that the present invention provides.
Detailed description of the invention
Technical scheme and the technique effect reached for making to present invention solves the technical problem that, using are clearer,
Below in conjunction with accompanying drawing, the technical scheme of the embodiment of the present invention is described in further detail, it is clear that retouched
The embodiment stated is only a part of embodiment of the present invention rather than whole embodiments.Based in the present invention
Embodiment, the every other reality that those skilled in the art are obtained under not making creative work premise
Execute example, broadly fall into the scope of protection of the invention.
The filter circuit of the electromagnetism interference that the present invention provides both can extensively be applied in LED television field, especially
It is be applicable to TV power supply, can be used for again on the power panel of other electronic device field.
Fig. 1 is the filter circuit construction block diagram of the electromagnetism interference that the present invention provides.Fig. 2 is that the present invention carries
The filter circuit schematic diagram of the electromagnetism interference of confession.With reference to shown in Fig. 1 and Fig. 2, the filter of this electromagnetism interference
Wave circuit includes filter circuit 1 and rectification circuit 2, the outfan of described filter circuit 1 and described rectification circuit
The input of 2 connects, and also includes an EMI suppression circuit 3, a described EMI suppression circuit 3 defeated
Entering end to input with AC exchange and 4 be connected, its outfan is connected with the input of described filter circuit 1, and described the
One EMI suppression circuit 3 includes the first common mode inductance LF1, the first common mode capacitance CY1 and the second common mode capacitance
CY2, the first input end of described first common mode inductance LF1 exchanges phase line N of input 4 even with described AC
Connecing, its second input is connected with the zero line L of described AC exchange input 4, described first common mode capacitance CY1
It is connected across between the first outfan and the ground of described first common mode inductance LF1, described second common mode capacitance CY2
It is connected across between the second outfan and the ground of described first common mode inductance LF1.The above-mentioned ground related to is coldly.
The radiation that the switching power circuit connect after rectification circuit in prior art produces, on the one hand by certainly
Body is to space radiation, and on the other hand radiant loop is that switching tube-rectification circuit-filter circuit-AC exchange input is inserted
Seat-electrical network, thus electrical network is produced and pollutes, the filter circuit of the electromagnetism interference that the present invention provides increases by first
EMI suppression circuit, has filtered the interference of low-frequency range, reduces the EMI impact on electrical network.
Specifically, the first common mode inductance LF1 of the present invention the oneth EMI suppression circuit 3 is little common mode inductance,
The sensibility reciprocal range of choice of described first common mode inductance LF1 is 1uH to 500uH.Described first common mode capacitance CY1
It is 22pF to 100pF with the Capacity Selection scope of the second common mode capacitance CY2.The big common mode of general TV power supply
Inductance refers to that volume and sensibility reciprocal are relatively big, and sensibility reciprocal is more than 1mH level；Little common mode inductance sensibility reciprocal is at uH level, volume
Little.The capacity of the first common mode capacitance CY1 and the second common mode capacitance CY2 can be adjusted according to actual needs.
Shown in Fig. 2, described filter circuit 1 includes the first differential mode capacitor CX1, the second common mode inductance LF2
And the second differential mode capacitor CX2, the two ends of described first differential mode capacitor CX1 respectively with described second common mode inductance
Two inputs of LF2 connect, described second differential mode capacitor CX2 respectively with described second common mode inductance LF2
Two outfans connect.In the present embodiment, the first differential mode capacitor CX1, the second common mode inductance LF2 and
Two differential mode capacitor CX2 form LC filter circuit, and filter circuit suppression electrical network input noise, to posterior member
Play a protective role.Specifically, in the present embodiment, the second common mode inductance LF2 is big common mode inductance, described
The sensibility reciprocal of the second common mode inductance LF2 is more than 1mH.The sensibility reciprocal of the second common mode inductance LF2 can be according to actual need
Select.
Fig. 3 is the filter circuit construction block diagram of another electromagnetism interference that the present invention provides.In conjunction with Fig. 1, figure
Shown in 2 and Fig. 3, the filter circuit of this electromagnetism interference is different from the filter circuit of electromagnetism interference shown in Fig. 1
Part is, also includes the 2nd EMI suppression circuit being arranged between described filter circuit and rectification circuit.
Specifically, in the present embodiment, described 2nd EMI suppression circuit includes the 3rd common mode capacitance CY3 and
Four common mode capacitance CY4, described 3rd common mode capacitance CY3 be connected across described second differential mode capacitor CX2 one end with
Between ground, described 4th common mode capacitance CY4 is connected across the other end and the ground of described second differential mode capacitor CX2
Between.The ground referred here to is coldly.In the present embodiment, the 3rd common mode capacitance CY3 and the 4th common mode capacitance CY4
Reduce the common mode disturbances in circuit.The EMI that common mode current in TV power supply circuit produces, a part is logical
Cross ferrum backboard (coldly) the-the three common mode capacitance CY3 and the 4th common mode capacitance CY4-the second common mode inductance LF2-
AC exchanges input socket-electrical grid transmission, in this loop, increases by an EMI suppression circuit, has further
Effect filters the interference of low-frequency range, reduces the EMI harm to electrical network.In the present embodiment, the 3rd common mode capacitance CY3
470pF is all elected as, certainly, in some other embodiment with the capacity of the 4th common mode capacitance CY4, it is possible to
Mate with the parameter selecting other as required.
Specifically, shown in Fig. 2, the first input end of described first common mode inductance LF1 and the second input
Between end, bridging has a varistor TNR.From the point of view of input, access varistor TNR and can suppress electricity
The transient state differential mode interference signal that net fluctuation causes, by the transient absorption of varistor TNR so that after incoming
The spike energy of end reduces.
In another embodiment, the filter circuit of electromagnetism interference also includes a critesistor TH, described temperature-sensitive electricity
Resistance TH is connected to the described 3rd common-mode resistance CY3 connection end with described second differential mode capacitor CX2 with described
Between rectification circuit 2.Critesistor TH in circuit is NTC thermistor TH, i.e. negative temperature coefficient heat
Quick resistance TH, plays the purpose of suppression dash current, thus protects rear class element in electric power starting moment.
Preferably, shown in Fig. 2, second input of described first common mode inductance LF1 and described AC
It is provided with electric fuse between the zero line L of exchange input 4.Electric fuse plays overload protective function, thus protects rear class
Element.
The filter circuit of the electromagnetism interference that the present invention provides both can save the big magnet ring on power line, again may be used
To save one-level big common mode inductance circuit, save Material Cost, it is also possible to save pcb board area, reach
The purpose of suppression EMC (Electro Magnetic Compatibility), low side EMI is suppressed very well；
Mated by circuit parameter, the EMI of low-frequency range scope is played good inhibiting effect.This electromagnetism interference
Filter circuit both extensively can apply in LED television field, can be used for again the electricity of other electronic device field
On source plate.When power line uses straight cutting mode to input in electronic equipment, use this circuit, both can save power supply
Magnet ring on line, can meet again EMC test request.
It should be noted that as a preferred implementation of the technical program, the first common mode inductance LF1
Sensibility reciprocal be chosen as 100uH, the capacity of the first common mode capacitance CY1 and the second common mode capacitance CY2 is all chosen as
100pF, the capacity value of the first differential mode capacitor CX1 is 220nF, and the capacity of the second differential mode capacitor CX2 takes
Value is for 470nF, and the sensibility reciprocal of the second common mode inductance LF2 is chosen as 30mH, the 3rd common mode capacitance CY3 and the
The equal value of capacity of four common mode capacitance CY4 is 470pF.The filter circuit of this electromagnetism interference can well
Filter the interference of low-frequency range, reduce the EMI impact on electrical network.
Above content is only presently preferred embodiments of the present invention, for those of ordinary skill in the art, according to this
The thought of invention, the most all will change, and this specification content is not
It is interpreted as limitation of the present invention.
Claims (10)
1. a filter circuit for electromagnetism interference, including filter circuit and rectification circuit, described filter circuit
Outfan be connected with the input of described rectification circuit, it is characterised in that also include the oneth EMI suppression electricity
Road, the input of a described EMI suppression circuit is connected with AC exchange input, its outfan and described filter
The input of wave circuit connects, and a described EMI suppression circuit includes the first common mode inductance LF1, first altogether
Mould electric capacity CY1 and the second common mode capacitance CY2, the first input end of described first common mode inductance LF1 is with described
The phase line of AC exchange input connects, and its second input is connected with the zero line of described AC exchange input, described
First common mode capacitance CY1 is connected across between the first outfan and the ground of described first common mode inductance LF1, described
Second common mode capacitance CY2 is connected across between the second outfan and the ground of described first common mode inductance LF1.
The filter circuit of electromagnetism interference the most according to claim 1, it is characterised in that described filtering
Circuit includes the first differential mode capacitor CX1, the second common mode inductance LF2 and the second differential mode capacitor CX2, described
The two ends of one differential mode capacitor CX1 two inputs with described second common mode inductance LF2 respectively are connected, described
Two outfans with described second common mode inductance LF2 respectively of the second differential mode capacitor CX2 are connected.
The filter circuit of electromagnetism interference the most according to claim 2, it is characterised in that also include setting
The 2nd EMI suppression circuit being placed between described filter circuit and rectification circuit.
The filter circuit of electromagnetism interference the most according to claim 3, it is characterised in that described second
EMI suppression circuit includes the 3rd common mode capacitance CY3 and the 4th common mode capacitance CY4, described 3rd common mode capacitance
CY3 is connected across between described second differential mode capacitor CX2 one end and ground, described 4th common mode capacitance CY4 across
It is connected between the other end and the ground of described second differential mode capacitor CX2.
The filter circuit of electromagnetism interference the most according to claim 1, it is characterised in that described first
Between first input end and second input of common mode inductance LF1, bridging has a varistor TNR.
The filter circuit of electromagnetism interference the most according to claim 4, it is characterised in that also include one
It is second poor with described that critesistor TH, described critesistor TH are connected to described 3rd common-mode resistance CY3
Between connection end and the described rectification circuit of mould electric capacity CX2.
The filter circuit of electromagnetism interference the most according to claim 1, it is characterised in that described first
The Capacity Selection scope of common mode capacitance CY1 and the second common mode capacitance CY2 is 22pF to 100pF.
The filter circuit of electromagnetism interference the most according to claim 1, it is characterised in that described first
The sensibility reciprocal range of choice of common mode inductance LF1 is 1uH to 500uH.
The filter circuit of electromagnetism interference the most according to claim 2, it is characterised in that described second
The sensibility reciprocal of common mode inductance LF2 is more than 1mH.
The filter circuit of electromagnetism interference the most according to claim 1, it is characterised in that described
Second input of one common mode inductance LF1 exchanges with described AC and is provided with electric fuse between the zero line inputted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610586708.9A CN106026634A (en) | 2016-07-22 | 2016-07-22 | Anti-electromagnetic interference filtering circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610586708.9A CN106026634A (en) | 2016-07-22 | 2016-07-22 | Anti-electromagnetic interference filtering circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106026634A true CN106026634A (en) | 2016-10-12 |
Family
ID=57117542
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610586708.9A Pending CN106026634A (en) | 2016-07-22 | 2016-07-22 | Anti-electromagnetic interference filtering circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106026634A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106656115A (en) * | 2016-10-19 | 2017-05-10 | 延锋伟世通电子科技（上海）有限公司 | Long distance clock signal EMI inhibition circuit |
| CN108226668A (en) * | 2017-12-07 | 2018-06-29 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of quick rectification device of power cord conduction transmitting test |
| CN110401336A (en) * | 2019-08-02 | 2019-11-01 | 广东美的制冷设备有限公司 | Ac input circuit and air conditioner |
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| CN108226668A (en) * | 2017-12-07 | 2018-06-29 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of quick rectification device of power cord conduction transmitting test |
| CN110401336A (en) * | 2019-08-02 | 2019-11-01 | 广东美的制冷设备有限公司 | Ac input circuit and air conditioner |
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