CN107528466A - A kind of EMI filter circuit - Google Patents
A kind of EMI filter circuit Download PDFInfo
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- CN107528466A CN107528466A CN201610443186.7A CN201610443186A CN107528466A CN 107528466 A CN107528466 A CN 107528466A CN 201610443186 A CN201610443186 A CN 201610443186A CN 107528466 A CN107528466 A CN 107528466A
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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
Abstract
A kind of EMI filter circuit, including electromagnetic interface filter and power circuit block, first input end connection input L lines, the second input connection input N lines, the 3rd input connection output N lines, the 4th input connection output L lines of the electromagnetic interface filter, the first output end, the second output end, the 3rd output end, the 4th output end of the electromagnetic interface filter connect the power circuit block.Implement the EMI filter circuit of the present invention, output and output port all use same electromagnetic interface filter, therefore small volume, cost are low and can meet high power density demand.
Description
Technical field
The present invention relates to electromagnetic interference (Electromagnetic Interference, EMI) field, more specifically,
It is related to a kind of EMI filter circuit.
Background technology
Current UPS products generally have two groups of electromagnetic interface filters, suppress the interference of input port, output port respectively, with
Meet every country or the EMC authentication requestings in area.Fig. 1 shows a kind of EMI filter circuit of common prior art.Such as figure
Shown in 1, the EMI filter circuit includes being connected to input L lines and the input electromagnetic interface filter 11 inputted between N lines and input EMI
The power circuit block 12 of the connection of wave filter 11 and the output electromagnetic interface filter 13, Yi Jiyu being connected with power circuit block 12
Export output L lines and output N lines that electromagnetic interface filter 13 connects.The defects of EMI filter circuit shown in Fig. 1 is, input and defeated
Exit port is respectively necessary for a wave filter, therefore causes volume larger, and difficulty meets high power density demand, and cost is higher.
The content of the invention
The technical problem to be solved in the present invention is, for the drawbacks described above of prior art, there is provided a kind of small volume, cost
EMI filter circuit low and that high power density demand can be met.
The technical solution adopted for the present invention to solve the technical problems is：A kind of EMI filter circuit is constructed, its feature exists
In, including electromagnetic interface filter and power circuit block, the first input end connection input L lines of the electromagnetic interface filter, the second input
End connection input N lines, the 3rd input connection output N lines, the 4th input connection output L lines, the first of the electromagnetic interface filter
Output end, the second output end, the 3rd output end, the 4th output end connect the power circuit block.
In EMI filter circuit of the present invention, the second input and the 3rd input of the electromagnetic interface filter are short
Connect, the second output end and the 3rd output end short circuit of the electromagnetic interface filter.
In EMI filter circuit of the present invention, the electromagnetic interface filter includes the first inductance, the second inductance, the 3rd electricity
Sense, the first X electric capacity, the 2nd X electric capacity, the 3rd X electric capacity, the 4th X electric capacity and the first Y capacitance, the first end of first inductance connect
Connect the input L lines, the second end connects the power circuit block, the first end connection input N lines of second inductance
The power circuit block is connected with output N lines, the second end, the first end of the 3rd inductance connects the output L lines, second
End connects the power circuit block, the first end of the first X capacitance connections to first inductance and second inductance
First end between, the first end of the 2nd X capacitance connections to second inductance and the first end of the 3rd inductance it
Between, the 3rd X capacitance connections are between the second end of first inductance and the second end of second inductance, and the described 4th
To between the second end of second inductance and the second end of the 3rd inductance, first Y capacitance is connected to X capacitance connections
Between the second end and ground of second inductance.
In EMI filter circuit of the present invention, the electromagnetic interface filter also includes the second Y capacitance, the 2nd Y electricity
Appearance is connected between first end and the ground of second inductance.
In EMI filter circuit of the present invention, the electromagnetic interface filter also includes the 3rd Y capacitance and the 4th Y capacitance,
3rd Y capacitance is connected between first end and the ground of first inductance, and the 4th Y capacitance is connected to the 3rd electricity
Between the first end and ground of sense.
In EMI filter circuit of the present invention, the electromagnetic interface filter also includes the 5th Y capacitance and the 6th Y capacitance,
5th Y capacitance is connected between the second end and ground of first inductance, and the 6th Y capacitance is connected to the 3rd electricity
Between the second end and ground of sense.
In EMI filter circuit of the present invention, the electromagnetic interface filter also includes the 4th inductance, the 5th inductance, the 6th
Inductance, the 5th X electric capacity, the 6th X electric capacity, the 7th Y capacitance, the 8th Y capacitance and the 9th Y capacitance, the first end of the 4th inductance
Connecting the second end of first inductance, the first end of the 5th inductance connects the second end of second inductance, and described the
The first ends of six inductance connects the second end of the 3rd inductance, the second end of the 4th inductance, the of the 5th inductance
Two ends connect the power circuit block, the 5th X capacitance connections to the described 4th electricity with the second end of the 6th inductance
Between second end of sense and the second end of the 5th inductance, the 6th X capacitance connections to the second end of the 6th inductance
Between the second end of the 5th inductance, the 7th Y capacitance is connected between the second end and ground of the 4th inductance, institute
State the 8th Y capacitance to be connected between the second end and ground of the 5th inductance, the 9th Y capacitance is connected to the 6th inductance
The second end and ground between.
In EMI filter circuit of the present invention, the electromagnetic interface filter includes the first inductance, the second inductance, the 3rd electricity
Sense, the 4th inductance, the first X electric capacity, the 2nd X electric capacity, the 3rd X electric capacity, the 4th X electric capacity, the first Y capacitance and the second Y capacitance, it is described
The first end of first inductance connects the input L lines, the second end connects the power circuit block, and the first of second inductance
End connects the input N lines, the second end connects the power circuit block, and the first end of the 3rd inductance connects the output
N lines, the second end connect the power circuit block, and the first end of the 4th inductance connects the output L lines, the connection of the second end
The power circuit block, the first end of the first X capacitance connections to first inductance and the first of second inductance
It is described between the first end of the 2nd X capacitance connections to the 3rd inductance and the first end of the 4th inductance between end
To between the second end of first inductance and the second end of second inductance, the 4th X electric capacity connects 3rd X capacitance connections
It is connected between the second end of the 3rd inductance and the second end of the 4th inductance, first Y capacitance is connected to described
Between second end of two inductance and ground, second Y capacitance is connected between the second end and ground of the 3rd inductance.
In EMI filter circuit of the present invention, the electromagnetic interface filter also includes the 3rd Y capacitance and the 4th Y capacitance,
3rd Y capacitance is connected between first end and the ground of second inductance, and the 4th Y capacitance is connected to the 3rd electricity
Between the first end and ground of sense.
In EMI filter circuit of the present invention, the electromagnetic interface filter also includes the 5th Y capacitance and the 6th Y capacitance,
For 5th capacitance connection between the first end of first inductance and ground, the 6th Y capacitance is connected to the 4th electricity
Between the first end and ground of sense.
Implement the EMI filter circuit of the present invention, output and output port all use same electromagnetic interface filter, therefore volume
It is small, cost is low and can meet high power density demand
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
Fig. 1 is the schematic diagram of the EMI filter circuit of common prior art；
Fig. 2 is the schematic diagram of the first embodiment of the EMI filter circuit of the present invention；
Fig. 3 is the schematic diagram of the second embodiment of the EMI filter circuit of the present invention；
Fig. 4 is the circuit diagram of the 3rd embodiment of the EMI filter circuit of the present invention；
Fig. 5 is the circuit diagram of the fourth embodiment of the EMI filter circuit of the present invention；
Fig. 6 is the circuit diagram of the 5th embodiment of the EMI filter circuit of the present invention；
Fig. 7 is the circuit diagram of the sixth embodiment of the EMI filter circuit of the present invention；
Fig. 8 is the circuit diagram of the 7th embodiment of the EMI filter circuit of the present invention；
Fig. 9 is the circuit diagram of the 8th embodiment of the EMI filter circuit of the present invention；
Figure 10 is the circuit diagram of the 9th embodiment of the EMI filter circuit of the present invention.
Embodiment
Fig. 2 is the schematic diagram of the first embodiment of the EMI filter circuit of the present invention.As shown in Fig. 2 the EMI filters of the present invention
Wave circuit includes electromagnetic interface filter 21 and power circuit block 22.The first input end connection input L lines of the electromagnetic interface filter 21,
Second input connection input N lines, the 3rd input connection output N lines, the 4th input connection output L lines, the EMI filtering
The first output end, the second output end, the 3rd output end, the 4th output end of device 21 connect the power circuit block 22.
In the present invention, the electromagnetic interface filter 21 can use any electromagnetic interface filter construction well known in the prior art.
For example, the electromagnetic interface filter 21 can be one-level PI mode filters, two level PI mode filters, or even multiple filter.This area
Technical staff can be according to the teachings of the present invention, wave filter as construction.
The power circuit block 22 can include any ups power module well known in the prior art.The present invention's
In one preferred embodiment, the input N lines of the both sides of electromagnetic interface filter 21 and the output N line short circuits.The electromagnetic interface filter
Inductance in 21 can be common mode inductance, and its winding can share magnetic core.
Implement the EMI filter circuit of the present invention, output and output port all use same electromagnetic interface filter, therefore volume
It is small, cost is low and can meet high power density demand.
Fig. 3 is the schematic diagram of the second embodiment of the EMI filter circuit of the present invention.As shown in Fig. 2 the EMI filters of the present invention
Wave circuit includes electromagnetic interface filter 30 and power circuit block.The first input end connection input L lines of the electromagnetic interface filter 30, the
Two inputs connection input N lines connect output L lines, the first output of the electromagnetic interface filter 30 with output N lines, the 3rd input
End, the second output end, the 3rd output end connect the power circuit block.
Include PFC module 31, busbar modules 32, inversion module 33 and LC filtering in the power circuit block shown in Fig. 3
Module 34.The input of the first output end connection PFC module 31 of electromagnetic interface filter, the output end connection of the PFC module 31 are female
Wire module 32.The positive bus-bar of busbar modules 32 connects inversion module 33 with negative busbar.The N line ends connection EMI filters of busbar modules 32
Second output end of ripple device 30.3rd output end of the output end connection electromagnetic interface filter 30 of inversion module 34.
In the present invention, the electromagnetic interface filter 30 can use any electromagnetic interface filter construction well known in the prior art.
Inductance in the electromagnetic interface filter 30 can be common mode inductance, and its winding can share magnetic core.Those skilled in the art know,
Although Fig. 3 shows the preferred implementation of power circuit block.But power circuit block can also have various other realizations
Mode.Here, the present invention is not limited by the specific configuration of power circuit block.
Implement the EMI filter circuit of the present invention, output and output port all use same electromagnetic interface filter, therefore volume
It is small, cost is low and can meet high power density demand.Further, in the present invention, the characteristic led directly to using N lines,
Input N lines and output N line short circuits, normal civil power is inputted under inverter mode, and no current on N lines is more efficient, and input,
Output port meets the EMI indexs of industry-by-industry standard simultaneously.
Fig. 4 is the circuit diagram of the 3rd embodiment of the EMI filter circuit of the present invention.As shown in figure 4, the EMI filtered electricals
Road includes electromagnetic interface filter and power circuit block 40.The first input end connection input L lines of the electromagnetic interface filter, the second input
End connection input N lines and output N lines, the 3rd input, which connect, exports L lines, the first output end of the electromagnetic interface filter, second defeated
Go out end, the 3rd output end connects the power circuit block 40.In the present embodiment, the power circuit block 40 can include
Any ups power module well known in the prior art.
In the present embodiment, the electromagnetic interface filter includes inductance L1, inductance L2, inductance L3, electric capacity X1, electric capacity X2, electric capacity
X3, electric capacity X4 and electric capacity Y5, electric capacity Y2.The first end of the inductance L1 connects the input L lines, the second end connects the power supply
Circuit module 40, the first end of the inductance L2 connect the input N lines and connect the power circuit with output N lines, the second end
Module 40, the first end of the inductance L3 connect the output L lines, the second end connection power circuit block 40.The electricity
Hold X1 to be connected between the first end of the inductance L1 and the first end of the inductance L2, the electric capacity X2 is connected to the inductance
Between L2 first end and the first end of the inductance L3, the electric capacity X3 is connected to the second end of the inductance L1 and the electricity
Between the second end for feeling L2, the electric capacity X4 is connected between the second end of the inductance L2 and the second end of the inductance L3,
The electric capacity Y5 is connected between the second end and ground of the inductance L2.The electric capacity Y2 is connected to the first end of the inductance L2
Between ground.
In a preferred embodiment of the invention, described inductance L1, L2 and L3 are three windings of common mode inductance, described three
Winding shares a magnetic core.The output N lines and input N line short circuits, form a conductor.One in the present invention simplifies implementation
In example, it is convenient to omit electric capacity Y2, on the basis of the electromagnetic interface filter low frequency insertion loss is not influenceed, simplify the EMI filtering
The structure of device, save cost and volume.
In the present embodiment, the electric capacity Y2 is the first order Y capacitance over the ground of input and output N lines, and electric capacity Y5 is that input is defeated
Go out the second level of N lines Y capacitance over the ground.And electric capacity X1, X2, it is first order X electric capacity of the input and output L lines to input and output N lines,
Electric capacity X3, X4, it is second level X electric capacity of the input and output L lines to input and output N lines.Common mode on first order input and output L lines is done
Disturb electric current can by electric capacity X1, X2, then by electric capacity Y2 to ground.Common-mode interference current on second level input and output L lines can
With by electric capacity X3, X4, then by electric capacity Y5 to ground.
Implement the EMI filter circuit of the present invention, output and output port all use same electromagnetic interface filter, therefore volume
It is small, cost is low and can meet high power density demand.Further, in the present invention, the characteristic led directly to using N lines,
Input N lines and output N line short circuits, normal civil power is inputted under inverter mode, and no current on N lines is more efficient, and input,
Output port meets the EMI indexs of industry-by-industry standard simultaneously.Also, further, can be by the common mode disturbances electricity on L lines
Stream is output to ground.
Fig. 5 is the circuit diagram of the fourth embodiment of the EMI filter circuit of the present invention.As shown in figure 5, the EMI filtered electricals
Road includes electromagnetic interface filter and power circuit block 50.The first input end connection input L lines of the electromagnetic interface filter, the second input
End connection input N lines and output N lines, the 3rd input, which connect, exports L lines, the first output end of the electromagnetic interface filter, second defeated
Go out end, the 3rd output end connects the power circuit block 50.In the present embodiment, the power circuit block 50 can include
Any ups power module well known in the prior art.
In the present embodiment, the electromagnetic interface filter includes inductance L1, inductance L2, inductance L3, electric capacity X1, electric capacity X2, electric capacity
X3, electric capacity X4 and electric capacity Y5, electric capacity Y2, electric capacity Y1 and electric capacity Y3.The first end of the inductance L1 connects the input L lines, the
Two ends connect the power circuit block 50, and the first end of the inductance L2 connects the input N lines and output N lines, the second end
The power circuit block 50 is connected, the first end of the inductance L3 connects the output L lines, the second end connection power supply electricity
Road module 50.The electric capacity X1 is connected between the first end of the inductance L1 and the first end of the inductance L2, the electric capacity
X2 is connected between the first end of the inductance L2 and the first end of the inductance L3, and the electric capacity X3 is connected to the inductance L1
The second end and the inductance L2 the second end between, the electric capacity X4 is connected to the second end of the inductance L2 and the inductance
Between L3 the second end, the electric capacity Y5 is connected between the second end and ground of the inductance L2.The electric capacity Y2 is connected to institute
Between first end and the ground of stating inductance L2.The electric capacity Y3 is connected between first end and the ground of the inductance L1, the electric capacity
Y3 is connected between first end and the ground of the inductance L3.
In a preferred embodiment of the invention, described inductance L1, L2 and L3 are three windings of common mode inductance, described three
Winding shares a magnetic core.The output N lines and input N line short circuits, form a conductor.
In the present embodiment, described electric capacity Y3, Y1, Y2 are to input L lines, input and output N lines and the first order pair for exporting L lines
Ground Y capacitance, electric capacity Y5 are the second level Y capacitances over the ground of input and output N lines.And electric capacity X1, X2 are input and output L lines to defeated
Enter to export the first order X electric capacity of N lines, electric capacity X3, X4, be second level X electric capacity of the input and output L lines to input and output N lines.Second
Level input and output L lines on common-mode interference current can by electric capacity X3, X4, then by electric capacity Y5 to.
Implement the EMI filter circuit of the present invention, output and output port all use same electromagnetic interface filter, therefore volume
It is small, cost is low and can meet high power density demand.Further, in the present invention, the characteristic led directly to using N lines,
Input N lines and output N line short circuits, normal civil power is inputted under inverter mode, and no current on N lines is more efficient, and input,
Output port meets the EMI indexs of industry-by-industry standard simultaneously.Also, further, can be by second level input and output L lines
Common-mode interference current be output to ground.
Fig. 6 is the circuit diagram of the 5th embodiment of the EMI filter circuit of the present invention.As shown in fig. 6, the EMI filtered electricals
Road includes electromagnetic interface filter and power circuit block 60.The first input end connection input L lines of the electromagnetic interface filter, the second input
End connection input N lines and output N lines, the 3rd input, which connect, exports L lines, the first output end of the electromagnetic interface filter, second defeated
Go out end, the 3rd output end connects the power circuit block 60.In the present embodiment, the power circuit block 60 can include
Any ups power module well known in the prior art.
In the present embodiment, the electromagnetic interface filter includes inductance L1, inductance L2, inductance L3, electric capacity X1, electric capacity X2, electric capacity
X3, electric capacity X4 and electric capacity Y4, electric capacity Y6, electric capacity Y5, electric capacity Y2, electric capacity Y1 and electric capacity Y3.The first end connection of the inductance L1
The input L lines, the second end connect the power circuit block 50, the first end of the inductance L2 connect the input N lines with
Export N lines, the second end connects the power circuit block 50, the first end connection output L lines of the inductance L3, the second end
Connect the power circuit block 50.The electric capacity X1 is connected to the first end of the inductance L1 and the first end of the inductance L2
Between, the electric capacity X2 is connected between the first end of the inductance L2 and the first end of the inductance L3, and the electric capacity X3 connects
It is connected between the second end of the inductance L1 and the second end of the inductance L2, the electric capacity X4 is connected to the of the inductance L2
Between two ends and the second end of the inductance L3, the electric capacity Y5 is connected between the second end and ground of the inductance L2.It is described
Electric capacity Y2 is connected between first end and the ground of the inductance L2.The electric capacity Y3 is connected to the first end and ground of the inductance L1
Between, the electric capacity Y3 is connected between first end and the ground of the inductance L3.The electric capacity Y6 is connected to the inductance L1's
Between second end and ground, the electric capacity Y4 is connected between the second end and ground of the inductance L3.
In a preferred embodiment of the invention, described inductance L1, L2 and L3 are three windings of common mode inductance, described three
Winding shares a magnetic core.The output N lines and input N line short circuits, form a conductor.
In the present embodiment, described electric capacity Y3, Y1, Y2 are to input L lines, input and output N lines and the first order pair for exporting L lines
Ground Y capacitance, electric capacity Y6, Y5, Y4 are to input L lines, input and output N lines and export the second level of L lines Y capacitance over the ground.And electric capacity
X1, X2, it is first order X electric capacity of the input and output L lines to input and output N lines, electric capacity X3, X4, is that input and output L lines are defeated to inputting
Go out the second level X electric capacity of N lines.
Implement the EMI filter circuit of the present invention, output and output port all use same electromagnetic interface filter, therefore volume
It is small, cost is low and can meet high power density demand.Further, in the present invention, the characteristic led directly to using N lines,
Input N lines and output N line short circuits, normal civil power is inputted under inverter mode, and no current on N lines is more efficient, and input,
Output port meets the EMI indexs of industry-by-industry standard simultaneously.Also, further, can be by the common mode disturbances electricity on N lines
Stream is output to ground.Also, compared with setting electromagnetic interface filter respectively in output port and input port, inductance quantity reduces
50%, and the quantity of Y capacitance reduces 25%.Therefore, its performance is suitable with two wave filters are set, but cost ineffective rate
It is high.
Fig. 7 is the circuit diagram of the sixth embodiment of the EMI filter circuit of the present invention.It is illustrated that electromagnetic interface filter is in Fig. 7
The example of two-stage filter.Teaching based on Fig. 7, those skilled in the art can construct other kinds of wave filter, these filters
Ripple device both falls within protection scope of the present invention.
As shown in fig. 7, the EMI filter circuit includes electromagnetic interface filter and power circuit block 70.The electromagnetic interface filter
First input end connection input L lines, the second input connection input N lines and output N lines, the 3rd input connect and exports L lines,
The first output end, the second output end, the 3rd output end of the electromagnetic interface filter connect the power circuit block 70.In this reality
Apply in example, the power circuit block 70 can include any ups power module well known in the prior art.
In the present embodiment, the electromagnetic interface filter includes inductance L1, inductance L2, inductance L3, electric capacity X1, electric capacity X2, electric capacity
X3, electric capacity X4, electric capacity Y4, electric capacity Y6, electric capacity Y5, electric capacity Y2, electric capacity Y1, electric capacity Y3, inductance L4, inductance L5, inductance L6, electric capacity
X5, electric capacity X6, electric capacity Y7, electric capacity Y8 and electric capacity Y9.
The first end of the inductance L1 connects the input L lines, the second end connects the first end of the inductance L4.The electricity
Sense L2 first end connects the first end that the input N lines connect the inductance L5 with output N lines, the second end.The inductance L3
First end connect the output L lines, the second end connection inductance L6 first end.It is the second end of the inductance L4, described
Inductance L5 the second end connects the power circuit block 70 with the second end of the inductance L6.The electric capacity X1 is connected to described
Between inductance L1 first end and the first end of the inductance L2, the electric capacity X2 is connected to first end and the institute of the inductance L2
Between the first end for stating inductance L3, the electric capacity X3 be connected to the inductance L1 the second end and the inductance L2 the second end it
Between, the electric capacity X4 is connected between the second end of the inductance L2 and the second end of the inductance L3, the electric capacity X5 connections
To between the second end of the inductance L4 and the second end of the inductance L5, the electric capacity X6 is connected to the second of the inductance L6
Between end and the second end of the inductance L5.The electric capacity Y5 is connected between the second end and ground of the inductance L2.The electricity
Hold Y2 to be connected between first end and the ground of the inductance L2.The electric capacity Y3 is connected to the first end and ground of the inductance L1
Between, the electric capacity Y1 is connected between first end and the ground of the inductance L3.The electric capacity Y6 is connected to the of the inductance L1
Between two ends and ground, the electric capacity Y4 is connected between the second end and ground of the inductance L3.The electric capacity Y7 is connected to described
Between inductance L6 the second end and ground, the electric capacity Y8 is connected between the second end and ground of the inductance L5, the electric capacity Y9
It is connected between the second end and ground of the inductance L4.
In a preferred embodiment of the invention, described inductance L1, L2 and L3 are three windings of first order common mode inductance, institute
State three windings and share a magnetic core.Described inductance L4, L5 and L6 are three windings of second level common mode inductance, described three around
Group shares a magnetic core.The output N lines and input N line short circuits, form a conductor.
The principle of two level electromagnetic interface filter shown in Fig. 7 is identical with the principle of the wave filter of the EMI shown in Fig. 6, herein just not
Tire out again and state.
Implement the EMI filter circuit of the present invention, output and output port all use same electromagnetic interface filter, therefore volume
It is small, cost is low and can meet high power density demand.Further, in the present invention, the characteristic led directly to using N lines,
Input N lines and output N line short circuits, normal civil power is inputted under inverter mode, and no current on N lines is more efficient, and input,
Output port meets the EMI indexs of industry-by-industry standard simultaneously.
Fig. 8 is the circuit diagram of the 7th embodiment of the EMI filter circuit of the present invention.In the present embodiment, the output N lines
There is no short circuit with input N lines, be two independent windings on common mode inductance.As shown in figure 8, the EMI filter circuit bag of the present invention
Include electromagnetic interface filter and power circuit block 80.First input end connection input L lines, the second input of the electromagnetic interface filter connect
Connect input N lines, the 3rd input connection output N lines, the 4th input connection output L lines, the first output of the electromagnetic interface filter
End, the second output end, the 3rd output end, the 4th output end connect the power circuit block 80.
As shown in figure 8, the electromagnetic interface filter include inductance L1, inductance L2, inductance L3, inductance L4, electric capacity X1, electric capacity X2,
Electric capacity X3, electric capacity X4, electric capacity Y3, electric capacity Y2, electric capacity Y7 and electric capacity Y6.The first end connection input L lines of the inductance L1,
Second end connects the power circuit block 80, described in the first end of the inductance L2 connects the input N lines, the second end connects
Power circuit block 80, the first end of the inductance L3 connect the output N lines, the second end connection power circuit block
80, the inductance L4 first end connect the output L lines, the second end connects the power circuit block 80, the electric capacity X1
It is connected between the first end of the inductance L1 and the first end of the inductance L2, the electric capacity X2 is connected to the inductance L3's
Between first end and the first end of the inductance L4, the electric capacity X3 is connected to the second end of the inductance L1 and the inductance L2
The second end between, the electric capacity X4 is connected between the second end of the inductance L3 and the second end of the inductance L4, described
Electric capacity Y7 is connected between the second end and ground of the inductance L2, and the electric capacity Y6 is connected to the second end and ground of the inductance L3
Between.The electric capacity Y3 is connected between first end and the ground of the inductance L2, and the electric capacity Y2 is connected to the inductance L3's
Between first end and ground.
In a preferred embodiment of the invention, described inductance L1, L2, L3 and L4 are four windings of common mode inductance, described
Four windings share a magnetic core.In the simplified embodiment of the present invention, it is convenient to omit electric capacity Y2 and Y3, do not changing filter
It is further to reduce volume and cost on the basis of ripple device low frequency insertion loss characteristic.
In the present embodiment, the electric capacity Y2 is the first order Y capacitance over the ground for exporting N lines, and the electric capacity Y3 is input N lines
First order Y capacitance over the ground, electric capacity Y7 is to input the second level of N lines Y capacitance, the electric capacity Y6 are export N lines second over the ground
Level Y capacitance over the ground.And electric capacity X1, X2, it is to input L lines to input N lines, output L lines to the first order X electric capacity of output N lines, electricity
Hold X3, X4, be to input L lines to inputting N lines, exporting second level X electric capacity of the L lines to output N lines.Being total on first order input L lines
Mould interference electric current can be by electric capacity X1, again by electric capacity Y3 to ground.Common-mode interference current on first order output L lines can lead to
Cross electric capacity X2, again by electric capacity Y2 to ground.Common-mode interference current on second level input L lines can be by electric capacity X3, pass through again
Electric capacity Y7 to ground.Common-mode interference current on second level output L lines can be by electric capacity X4, again by electric capacity Y6 to ground.
Implement the EMI filter circuit of the present invention, output and output port all use same electromagnetic interface filter, therefore volume
It is small, cost is low and can meet high power density demand.Further, the common-mode interference current on L lines can be exported
To ground.
Fig. 9 is the circuit diagram of the 8th embodiment of the EMI filter circuit of the present invention.As shown in figure 9, the EMI filters of the present invention
Wave circuit includes electromagnetic interface filter and power circuit block 90.The first input end connection input L lines of the electromagnetic interface filter, second
Input connection input N lines, the 3rd input connection output N lines, the 4th input connection output L lines, the electromagnetic interface filter
First output end, the second output end, the 3rd output end, the 4th output end connect the power circuit block 90.
Embodiment illustrated in fig. 9 is approximate with Fig. 8, and its difference is that the electromagnetic interface filter shown in Fig. 9 further comprises electric capacity Y1
It is connected to electric capacity Y4, the electric capacity Y4 between first end and the ground of the inductance L1, the electric capacity Y1 is connected to the inductance
Between L4 first end and ground.
Description based on Fig. 8, those skilled in the art can construct embodiment illustrated in fig. 9, and understand its operation principle,
Just do not stated herein tired.
Figure 10 is the circuit diagram of the 9th embodiment of the EMI filter circuit of the present invention.Embodiment illustrated in fig. 10 is near with Fig. 9
Seemingly, its difference is, the electromagnetic interface filter shown in Figure 10 further comprises that electric capacity Y5 and electric capacity Y8, the electric capacity Y8 are connected to institute
State between inductance L1 the second end and ground, the electric capacity Y5 is connected between the second end and ground of the inductance L4.
Description based on Fig. 9, those skilled in the art can construct embodiment illustrated in fig. 10, and understand its work original
Reason, just do not stated herein tired.
Although the present invention is illustrated by specific embodiment, it will be appreciated by those skilled in the art that, do not departing from
In the case of the scope of the invention, various conversion and equivalent substitute can also be carried out to the present invention.Therefore, the present invention is not limited to institute
Disclosed specific embodiment, and the whole embodiments fallen within the scope of the appended claims should be included.
Claims (10)
- A kind of 1. EMI filter circuit, it is characterised in that including electromagnetic interface filter and power circuit block, the electromagnetic interface filter First input end connection input L lines, the second input connection input N lines, the 3rd input connection output N lines, the 4th input Connection output L lines, the first output end of the electromagnetic interface filter, the second output end, the 3rd output end, the 4th output end connection institute State power circuit block.
- 2. EMI filter circuit according to claim 1, it is characterised in that the second input of the electromagnetic interface filter and Three input short circuits, the second output end and the 3rd output end short circuit of the electromagnetic interface filter.
- 3. EMI filter circuit according to claim 2, it is characterised in that the electromagnetic interface filter includes the first inductance, the Two inductance, the 3rd inductance, the first X electric capacity, the 2nd X electric capacity, the 3rd X electric capacity, the 4th X electric capacity and the first Y capacitance, first electricity The first end of sense connects the input L lines, the second end connects the power circuit block, the first end connection of second inductance The input N lines connects power circuit block with output N lines, the second end, described in the first end of the 3rd inductance connects Export L lines, the second end connects the power circuit block, the first end of the first X capacitance connections to first inductance with Between the first end of second inductance, the first end of the 2nd X capacitance connections to second inductance and the 3rd electricity Between the first end of sense, the 3rd X capacitance connections to the second end of first inductance and the second end of second inductance Between, the 4th X capacitance connections are between the second end of second inductance and the second end of the 3rd inductance, and described One Y capacitance is connected between the second end and ground of second inductance.
- 4. EMI filter circuit according to claim 3, it is characterised in that the electromagnetic interface filter also includes the second Y capacitance, Second Y capacitance is connected between first end and the ground of second inductance.
- 5. EMI filter circuit according to claim 3, it is characterised in that the electromagnetic interface filter also includes the 3rd Y capacitance With the 4th Y capacitance, the 3rd Y capacitance is connected between first end and the ground of first inductance, the 4th Y capacitance connection To between the first end of the 3rd inductance and ground.
- 6. EMI filter circuit according to claim 5, it is characterised in that the electromagnetic interface filter also includes the 5th Y capacitance With the 6th Y capacitance, the 5th Y capacitance is connected between the second end and ground of first inductance, the 6th Y capacitance connection To between the second end and ground of the 3rd inductance.
- 7. EMI filter circuit according to claim 6, it is characterised in that the electromagnetic interface filter also include the 4th inductance, 5th inductance, the 6th inductance, the 5th X electric capacity, the 6th X electric capacity, the 7th Y capacitance, the 8th Y capacitance and the 9th Y capacitance, the described 4th The first end of inductance connects the second end of first inductance, and the first end of the 5th inductance connects the of second inductance Two ends, the first end of the 6th inductance connect the second end of the 3rd inductance, the second end of the 4th inductance, described the Second end of five inductance connects the power circuit block with the second end of the 6th inductance, and the 5th X capacitance connections arrive Between second end of the 4th inductance and the second end of the 5th inductance, the 6th X capacitance connections to the described 6th electricity Between second end of sense and the second end of the 5th inductance, the 7th Y capacitance is connected to the second end of the 4th inductance Between ground, the 8th Y capacitance is connected between the second end and ground of the 5th inductance, and the 9th Y capacitance is connected to Between the second end and ground of 6th inductance.
- 8. EMI filter circuit according to claim 1, it is characterised in that the electromagnetic interface filter includes the first inductance, the Two inductance, the 3rd inductance, the 4th inductance, the first X electric capacity, the 2nd X electric capacity, the 3rd X electric capacity, the 4th X electric capacity, the first Y capacitance and Second Y capacitance, the first end of first inductance connects the input L lines, the second end connection power circuit block, described The first end of second inductance connects the input N lines, the second end connects the power circuit block, and the first of the 3rd inductance End connects the output N lines, the second end connects the power circuit block, and the first end of the 4th inductance connects the output L lines, the second end connect the power circuit block, the first end of the first X capacitance connections to first inductance and described Between the first end of second inductance, the first ends of the 2nd X capacitance connections to the 3rd inductance and the 4th inductance Between first end, the 3rd X capacitance connections between the second end of first inductance and the second end of second inductance, For the 4th X capacitance connections between the second end of the 3rd inductance and the second end of the 4th inductance, the first Y is electric Appearance is connected between the second end and ground of second inductance, and second Y capacitance is connected to the second end of the 3rd inductance Between ground.
- 9. EMI filter circuit according to claim 8, it is characterised in that the electromagnetic interface filter also includes the 3rd Y capacitance With the 4th Y capacitance, the 3rd Y capacitance is connected between first end and the ground of second inductance, the 4th Y capacitance connection To between the first end of the 3rd inductance and ground.
- 10. EMI filter circuit according to claim 9, it is characterised in that the electromagnetic interface filter also includes the 5th Y capacitance With the 6th Y capacitance, between the first end of first inductance and ground, the 6th Y capacitance connects the 5th capacitance connection To between the first end of the 4th inductance and ground.
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| CN201610443186.7A CN107528466B (en) | 2016-06-20 | 2016-06-20 | A kind of EMI filter circuit |
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| CN201610443186.7A CN107528466B (en) | 2016-06-20 | 2016-06-20 | A kind of EMI filter circuit |
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| WO2020169210A1 (en) * | 2019-02-22 | 2020-08-27 | Incell International Ab | Noise filtering in a battery module |
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| CN107528466B (en) | 2019-08-23 |
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