CN209948952U - Power supply double-circuit filter - Google Patents
Power supply double-circuit filter Download PDFInfo
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- CN209948952U CN209948952U CN201921065308.9U CN201921065308U CN209948952U CN 209948952 U CN209948952 U CN 209948952U CN 201921065308 U CN201921065308 U CN 201921065308U CN 209948952 U CN209948952 U CN 209948952U
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Abstract
The utility model discloses a power supply double-circuit filter, which comprises three input terminals and three output terminals; the first input terminal, the first output terminal, the second output terminal and the second input terminal form a first loop, and the second input terminal, the second output terminal, the third output terminal and the third input terminal form a second loop; the input end of the first loop is provided with a first differential mode capacitor, the output end of the first loop is provided with a third differential mode capacitor, and a first common mode inductor is arranged between the first differential mode capacitor and the third differential mode capacitor; the input end of the second loop is provided with a second differential mode capacitor, the output end of the second loop is provided with a fourth differential mode capacitor, and a third common mode inductor is arranged between the second differential mode capacitor and the fourth differential mode capacitor. The utility model discloses a power supply double-circuit filter can be used in DC/DC switching power supply output end with double-circuit output mode, realizes the function that one filter filters two circuits simultaneously; the method is beneficial to the miniaturization of electronic equipment, and simultaneously reduces the process difficulty and the process complexity of the electric fitting.
Description
Technical Field
The utility model belongs to the technical field of the wave filter, a power filter is related to, concretely relates to power double-circuit filter of LC structure.
Background
In a circuit using a DC/DC switching power supply, in order to reduce electromagnetic interference, a power filter is often required to be used at an input end or an output end of the DC/DC switching power supply to reduce circuit noise. Some DC/DC switching power supplies are in a dual output mode, i.e. two sets of output voltages. If a common power filter is used at the output of this type of DC/DC switching power supply, two power filters need to be used.
If two power filters are used, this will result in: on one hand, the device occupies a larger space, and is not beneficial to the miniaturization of electronic equipment; on the other hand, the electrical fitting process is complex, and the electrical fitting difficulty is increased.
SUMMERY OF THE UTILITY MODEL
To the weak point that exists in the above-mentioned problem, the utility model provides a power double-circuit filter.
The utility model discloses a power supply double-circuit filter, which comprises three input terminals and three output terminals;
the first input terminal, the first output terminal, the second output terminal and the second input terminal form a first loop, and the second input terminal, the second output terminal, the third output terminal and the third input terminal form a second loop;
the input end of the first loop is provided with a first differential mode capacitor, the output end of the first loop is provided with a third differential mode capacitor, and a first common mode inductor is arranged between the first differential mode capacitor and the third differential mode capacitor;
and a second differential mode capacitor is arranged at the input end of the second loop, a fourth differential mode capacitor is arranged at the output end of the second loop, and a third common mode inductor is arranged between the second differential mode capacitor and the fourth differential mode capacitor.
As a further improvement of the present invention, the first loop is provided with a first common mode capacitor between the third differential mode capacitor and the output terminal, and the second loop is provided with a second common mode capacitor between the fourth differential mode capacitor and the output terminal.
As a further improvement of the present invention, the first common mode capacitor and the second common mode capacitor are high voltage ceramic capacitors.
As a further improvement of the present invention, the capacitance of the first common mode capacitor and the capacitance of the second common mode capacitor are in the range of 1 μ F to 100 μ F.
As a further improvement of the present invention, the first differential mode capacitor, the second differential mode capacitor, the third differential mode capacitor and the fourth differential mode capacitor are large-capacity ceramic capacitors.
As a further improvement of the present invention, the capacitances of the first differential mode capacitor, the second differential mode capacitor, the third differential mode capacitor and the fourth differential mode capacitor are in the range of 10nF to 1000 nF.
As a further improvement of the utility model, first common mode inductance and second common mode inductance are formed at same magnetic core by the enameled wire symmetrical winding.
As a further improvement of the utility model, the first common mode inductor is formed by winding two enameled wires A-a and C-C with a magnetic core, and the second common mode inductor is formed by winding two enameled wires B-B and D-D with the magnetic core;
the A end of the enameled wire is connected with the first input terminal, and the a end of the enameled wire is connected with the first output terminal;
the end B of the enameled wire is in short circuit with the end C of the enameled wire and then is connected with the second input terminal, and the end B of the enameled wire is in short circuit with the end C of the enameled wire and then is connected with the second output terminal;
the D end of the enameled wire is connected with the third input terminal, and the D end of the enameled wire is connected with the third output terminal.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses a power supply double-circuit filter has two way structures, can be used in the DC/DC switching power supply output end with double-circuit output mode, realizes that a filter carries out the function of filtering to two way circuits simultaneously; the method is beneficial to the miniaturization of electronic equipment, and simultaneously reduces the process difficulty and the process complexity of the electric fitting.
Drawings
Fig. 1 is a schematic circuit diagram of a power supply double-circuit filter according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of the inductor L1 or L2 in fig. 1.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention is described in further detail below with reference to the accompanying drawings:
as shown in fig. 1, the present invention provides a power double-path filter, which includes three input terminals (a first input terminal 1, a second input terminal 2, and a third input terminal 3) and three output terminals (a first output terminal 4, a second output terminal 5, and a third output terminal 6); wherein:
the first input terminal 1 forms a first loop via the first output terminal 4, the second output terminal 5, the second input terminal 2, and the second input terminal 2 forms a second loop via the second output terminal 5, the third output terminal 6, and the third input terminal 3.
The utility model discloses be equipped with first differential mode electric capacity C1 at the input of first return circuit (between first input terminal 1 and the second input terminal 2), the output (between first output terminal 4 and the second output terminal 5) is equipped with third differential mode electric capacity C3, is equipped with first common mode inductance L1 between first differential mode electric capacity C1 and the third differential mode electric capacity C3, is equipped with first common mode electric capacity C5 between third differential mode electric capacity C3 and output.
The utility model discloses be equipped with second differential mode electric capacity C2 at the input of second return circuit (between second input terminal 2 and the third input terminal 3), the output (between second output terminal 5 and the third output terminal 6) is equipped with fourth differential mode electric capacity C4, be equipped with third common mode inductance L2 between second differential mode electric capacity C2 and fourth differential mode electric capacity C4, be equipped with second common mode electric capacity C6 between fourth differential mode electric capacity C4 and output.
Wherein:
the utility model discloses a first differential mode electric capacity C1, second differential mode electric capacity C2, third differential mode electric capacity C3 and fourth differential mode electric capacity C4 are large capacity ceramic capacitor for the differential mode noise that exists provides low impedance channel in first return circuit and the second return circuit, absorb the differential mode noise in 10kHz ~ 30MHz frequency range.
The utility model discloses a first common mode electric capacity C5 and second common mode electric capacity C6 are high-pressure ceramic capacitor for the common mode noise who exists in first return circuit and the second return circuit provides low impedance channel, absorbs the common mode noise in 10kHz ~ 30MHz frequency range.
The utility model discloses a first common mode inductance L1 and second common mode inductance L2 are formed at same magnetic core by the winding of enameled wire symmetry for absorb the differential mode noise and the common mode noise in first return circuit and second return circuit. Specifically, the method comprises the following steps:
as shown in fig. 2, through symmetrical winding, the enameled wires a-a and C-C and the magnetic core are wound to form a common mode inductor L1; the enameled wires B-B and D-D and the magnetic core are wound to form a common-mode inductor L2; the A end of the enameled wire is connected with the first input terminal 1, and the a end of the enameled wire is connected with the first output terminal 4; the end B of the enameled wire is in short circuit with the end C of the enameled wire and then connected with a second input terminal 2, and the end B of the enameled wire is in short circuit with the end C of the enameled wire and then connected with a second output terminal 5; the D end of the enameled wire is connected with the third input terminal 3, and the D end of the enameled wire is connected with the third output terminal 6.
Further, in the present invention,
in order to ensure the filtering effect and the circuit symmetry, the capacitors C1, C2, C3 and C4 use ceramic capacitors of the same model, and the rated voltage of the capacitors meets the 2-time derating requirement of the rated voltage of the filter; the capacitance of the capacitor is in the range of 1 muF to 100 muF.
In order to ensure the safety of the voltage resistance of the filter to the ground, high-voltage ceramic capacitors are used as the capacitors C5 and C6, and the voltage resistance meets the requirement of the test of the voltage to the ground of the whole machine; in order to ensure the filtering effect, the capacitance ranges of the C5 and C6 capacitors are as follows: 10nF to 1000 nF.
Capacitors C1 and C3 are connected in parallel to the input and output of the circuit 1, respectively, and serve as differential mode capacitors of the circuit to suppress differential mode interference in the circuit.
Capacitors C2 and C4 are connected in parallel to the input and output of the circuit 2, respectively, and serve as differential mode capacitors of the circuit to suppress differential mode interference in the circuit.
The capacitor C5 is connected between one end of the loop 1 and ground for suppressing common mode noise in the circuit, and has a frequency range of 10kHz to 30 MHz.
A capacitor C6 is connected between one end of the loop 2 and ground for suppressing common mode noise in the circuit, in the frequency range 10kHz to 30 MHz.
The common mode inductor L1 is used for absorbing the differential mode noise and the common mode noise in the first loop, and the frequency range is 10 kHz-30 MHz.
The common mode inductor L2 is used for absorbing the differential mode noise and the common mode noise in the second loop, and the frequency range is 10 kHz-30 MHz.
The utility model uses a magnetic core to wind two common mode inductors; two filtering loops are formed by the design combination of a differential mode capacitor, a common mode inductor and a common mode capacitor; the filter has the functions of two filters, reduces the electromagnetic noise of the circuit, meets the trend of miniaturization and integration of the existing circuit, and reduces the complexity of the electric fitting process.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A power supply double-circuit filter is characterized by comprising three input terminals and three output terminals;
the first input terminal, the first output terminal, the second output terminal and the second input terminal form a first loop, and the second input terminal, the second output terminal, the third output terminal and the third input terminal form a second loop;
the input end of the first loop is provided with a first differential mode capacitor, the output end of the first loop is provided with a third differential mode capacitor, and a first common mode inductor is arranged between the first differential mode capacitor and the third differential mode capacitor;
and a second differential mode capacitor is arranged at the input end of the second loop, a fourth differential mode capacitor is arranged at the output end of the second loop, and a third common mode inductor is arranged between the second differential mode capacitor and the fourth differential mode capacitor.
2. The power duplex filter of claim 1 wherein the first loop has a first common mode capacitor between the third differential mode capacitor and an output terminal, and the second loop has a second common mode capacitor between the fourth differential mode capacitor and an output terminal.
3. The power duplex filter of claim 2 wherein the first and second common-mode capacitors are high voltage ceramic capacitors.
4. The power duplexer of claim 3, wherein the first and second common-mode capacitors have capacitances in the range of 1 uf to 100 uf.
5. The power duplex filter of claim 1 wherein the first, second, third and fourth differential mode capacitors are bulk ceramic capacitors.
6. The power duplex filter of claim 5 wherein the first, second, third and fourth differential mode capacitors have a capacitance in the range of 10nF to 1000 nF.
7. The power duplex filter of claim 1 wherein the first and second common-mode inductors are formed by symmetrically winding enameled wires around a same core.
8. The power duplex filter of claim 7, wherein the first common mode inductor is formed by winding two enameled wires a-a, C-C and a magnetic core, and the second common mode inductor is formed by winding two enameled wires B-B, D-D and a magnetic core;
the A end of the enameled wire is connected with the first input terminal, and the a end of the enameled wire is connected with the first output terminal;
the end B of the enameled wire is in short circuit with the end C of the enameled wire and then is connected with the second input terminal, and the end B of the enameled wire is in short circuit with the end C of the enameled wire and then is connected with the second output terminal;
the D end of the enameled wire is connected with the third input terminal, and the D end of the enameled wire is connected with the third output terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921065308.9U CN209948952U (en) | 2019-07-09 | 2019-07-09 | Power supply double-circuit filter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921065308.9U CN209948952U (en) | 2019-07-09 | 2019-07-09 | Power supply double-circuit filter |
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| CN209948952U true CN209948952U (en) | 2020-01-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110212753A (en) * | 2019-07-09 | 2019-09-06 | 北京元六鸿远电子科技股份有限公司 | A kind of power supply two-way filter |
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2019
- 2019-07-09 CN CN201921065308.9U patent/CN209948952U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110212753A (en) * | 2019-07-09 | 2019-09-06 | 北京元六鸿远电子科技股份有限公司 | A kind of power supply two-way filter |
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