CN214674872U - DC output end conduction filter circuit applied to POE power supply - Google Patents
DC output end conduction filter circuit applied to POE power supply Download PDFInfo
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- CN214674872U CN214674872U CN202022253183.1U CN202022253183U CN214674872U CN 214674872 U CN214674872 U CN 214674872U CN 202022253183 U CN202022253183 U CN 202022253183U CN 214674872 U CN214674872 U CN 214674872U
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Abstract
The utility model relates to a be applied to DC output conduction filter circuit of POE power, include: the filter circuit comprises a filter inductor, a first capacitor and a second capacitor; the first end of the first capacitor is connected with the first end of the filter inductor and connected to the first end of the input circuit, and the second end of the first capacitor is connected with the second end of the filter inductor and connected to the second end of the input circuit; the third end connection of filter inductance is applied to the first output of the DC output conduction filter circuit of POE power, and the fourth end connection of filter inductance is applied to the second output of the DC output conduction filter circuit of POE power. The utility model discloses can eliminate the conducted interference who weakens POE power output end, can realize the effective filtering to the interference, reduce the requirement of POE power to interfering the production source, can rectify and change through EMI fast.
Description
Technical Field
The utility model relates to a POE power filtering's technical field, more specifically say, relate to a DC output conduction filter circuit who is applied to POE power.
Background
With the development of electronic and communication technologies, a great number of network devices are emerging, a network-based power supply system such as POE is becoming more popular, and the network devices have higher and higher requirements on POE power supplies, especially on EMI filtering.
The POE power supply provides direct current low voltage for the network equipment, and the POE power supply is a switch POE power supply and has EMI interference to the outside, wherein conducted interference can be transmitted to the network equipment through a DC line, and the normal work of the network equipment can be influenced.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, a DC output conduction filter circuit who is applied to the POE power is provided.
The utility model provides a technical scheme that its technical problem adopted is: construct a DC output conduction filter circuit who is applied to POE power, include: the filter circuit comprises a filter inductor, a first capacitor and a second capacitor;
the first end of the first capacitor is connected with the first end of the filter inductor and connected to the first end of the input circuit, and the second end of the first capacitor is connected with the second end of the filter inductor and connected to the second end of the input circuit;
the third end of the filter inductor is connected with the first output end of the DC output end conduction filter circuit applied to the POE power supply, and the fourth end of the filter inductor is connected with the second output end of the DC output end conduction filter circuit applied to the POE power supply.
Preferably, the capacitance value of the first capacitor is larger than that of the second capacitor.
Preferably, the filter inductor includes: the magnetic induction structure is arranged on the base; the magnetic induction structure includes: the coil structure is wound on the magnetic core;
the coil structure comprises a first coil and a second coil; the first coil and the second coil are separately wound on the magnetic core, and the first coil and the second coil are wound on the magnetic core by adopting a quarter winding method.
Preferably, the magnetic core is a toroidal core.
Preferably, the first coil and the second coil are separated and symmetrically wound on the annular magnetic core.
Preferably, the annular magnetic core is a 15K high permeability core.
Preferably, the inductance of the filter inductor is 1-5 mH.
Preferably, the method further comprises the following steps: the connecting device is arranged between the base and the magnetic induction structure so as to fix the magnetic induction structure on the base.
Preferably, the base includes a plurality of wiring pins including a first wiring pin, a second wiring pin, a third wiring pin and a fourth wiring pin separately provided on the base;
the first terminal of the first coil is correspondingly arranged on the first wiring pin, and the second terminal of the first coil is correspondingly arranged on the second wiring pin;
and the first terminal of the second coil is correspondingly arranged on the third wiring pin, and the second terminal of the second coil is correspondingly arranged on the fourth wiring pin. The utility model also provides a POE power, including above be applied to the DC output conduction filter circuit of POE power.
Implement the utility model discloses a be applied to DC output conduction filter circuit of POE power has following beneficial effect: the magnetic induction structure is arranged on the base; magnetic induction structure includes: the coil structure is wound on the magnetic core; the coil structure comprises a first coil and a second coil; the first coil and the second coil are separately wound on the magnetic core, and the first coil and the second coil are wound on the magnetic core by adopting a quarter winding method. The utility model discloses can eliminate the conducted interference who weakens POE power output end, can realize the effective filtering to the interference, reduce the requirement of POE power to interfering the production source, can rectify and change through EMI fast.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic structural diagram of a filter inductor according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a DC output conduction filter circuit applied to a POE power supply according to an embodiment of the present invention;
fig. 3 is a schematic block diagram of a POE power supply provided by the embodiment of the present invention.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
In order to solve present DC output conducted interference filter effect unsatisfactory, require high problem to equipment EMI filtering, the utility model provides a be applied to the DC output conducted filter circuit of POE power, this be applied to the DC output conducted filter circuit of POE power can set up the output at the POE power to adopt dedicated filter inductance 10, thereby improve conducted interference filter effect, and do not influence other electrical properties again, still can reduce simultaneously and require setting up EMI filtering, can adjust and change through EMI fast.
Specifically, referring to fig. 1, fig. 1 is a schematic structural diagram of an optional embodiment of each embodiment of the filter inductor 10 provided by the present invention.
As shown in fig. 1, the filter inductor 10 may include: the magnetic induction structure comprises a base 11 and a magnetic induction structure arranged on the base 11; magnetic induction structure includes: a magnetic core 12 and a coil structure wound around the magnetic core 12; the coil structure includes a first coil 13 and a second coil 14; the first coil 13 and the second coil 14 are separately wound around the core 12, and the first coil 13 and the second coil 14 are wound around the core 12 by a quarter-winding method. Optionally, the filter inductor 10 is an inductor and is a common mode inductor.
Further, as shown in fig. 1, in this embodiment, the core 12 is a ring-shaped core. Alternatively, in some embodiments, the toroidal core may be a 15K high permeability core. By adopting the magnetic core with high magnetic permeability of 15K, the inductance of the inductor can be easily increased, and the inductance of the inductor can be designed according to the design or the product requirement.
Further, in some embodiments, first coil 13 and second coil 14 are separated and symmetrically wound on a toroidal core. As shown in fig. 1, the first coil 13 and the second coil 14 are symmetrically disposed on two half circumferences of the toroidal core, and the first coil 13 and the second coil 14 are not connected to or overlapped with each other. As shown in fig. 1, by using quarter-winding for the first coil 13 and the second coil 14 (i.e., each coil is wound around only one quarter of the toroidal core 12). By adopting the winding method, certain leakage inductance and differential mode components exist in the filter inductor 10, so that a better filtering effect on filtering of differential mode components in the conducted interference is achieved. In addition, the number of turns of the first coil 13 and the second coil 14 may be as large as possible when winding, so as to ensure that the inductance of each coil is as large as possible. Optionally, in some embodiments, the inductance of the filter inductor 10 is 1-5 mH. Of course, it is understood that, in other embodiments, the inductance of the filter inductor 10 may also be made larger, which may be determined according to the requirement of the product, and the present invention is not limited in particular.
Further, in some embodiments, the first coil 13 and the second coil 14 may both be copper wires. Furthermore, the wire diameter of the adopted copper wire is as large as possible, so that the purpose of not influencing the overall efficiency of the POE power supply is achieved.
Further, as shown in fig. 1, in this embodiment, the filter inductor 10 may further include: a connecting means 15 arranged between the base 11 and the magnetic induction structure to fix the magnetic induction structure on the base 11. Alternatively, the connecting means 15 may be a fixing glue, and further, an AB glue may be used. Of course, it is understood that in other embodiments, the fixing glue may also be other glue that can fix the magnetic induction structure on the base 11, and is not limited to the AB glue.
Further, as shown in fig. 1, in some embodiments, the base 11 includes a plurality of terminal pins including a first terminal pin 111, a second terminal pin 112, a third terminal pin 113, and a fourth terminal pin 114 separately provided on the base 11.
Wherein, the first terminal of the first coil 13 is correspondingly installed on the first terminal pin 111, and the second terminal of the first coil 13 is correspondingly installed on the second terminal pin 112; the first terminal of the second coil 14 is correspondingly mounted on the third terminal foot 113 and the second terminal of the second coil 14 is correspondingly mounted on the fourth terminal foot 114.
In particular, the base 11 can function to support and fix the magnetic induction structure, and at the same time, it can also function to connect the magnetic induction structure with an external device or device. Alternatively, the base 11 may be made of plastic. Of course, it is understood that the base 11 can also be made of other materials that can perform the same function and do not interact with the magnetic induction structure (e.g. electrically connect with the magnetic induction structure or interfere with the electromagnetic effect of the magnetic induction structure).
Further, as shown in fig. 2, the utility model also provides a be applied to the DC output conduction filter circuit of POE power, wherein, this be applied to the DC output conduction filter circuit of POE power can set up the output at POE power (as shown in fig. 3).
Specifically, as shown in fig. 2, the DC output conduction filter circuit applied to the POE power supply may include: the filter inductor 10, the first capacitor C201, and the second capacitor C202 shown in fig. 1.
As shown in fig. 2, a first terminal of the first capacitor C201 is connected to the first terminal of the filter inductor 10 and to the first terminal of the input circuit, and a second terminal of the first capacitor C201 is connected to the second terminal of the filter inductor 10 and to the second terminal of the input circuit. The third end of this filter inductance 10 is connected and is applied to the first output of the DC output conduction filter circuit of POE power, and the fourth end of filter inductance 10 is connected and is applied to the second output of the DC output conduction filter circuit of POE power.
A first end of the filter inductor 10 is the first connection pin 111 disposed on the base 11, a second end of the filter inductor 10 is the second connection pin 112 disposed on the base 11, a third end of the filter inductor 10 is the third connection pin 113 disposed on the base 11, and a fourth end of the filter inductor 10 is the fourth connection pin 114 disposed on the base 11.
Optionally, in some embodiments, the capacitance of the first capacitor C201 is greater than the capacitance of the second capacitor C202.
As shown in fig. 2, the DC output conduction filter circuit applied to the POE power supply may be composed of a first capacitor C201, a second capacitor C202, and the filter inductor 10 (common mode inductor LF 201): the structure of the capacitor + the common mode inductor LF201+ the capacitor. Through the DC output end conduction filter circuit who is applied to the POE power that adopts this structure can block the reposition of redundant personnel to the interference of outwards conducting by the POE power, and common mode interference is blocked by common mode inductance LF201, and differential mode interference is blocked and shunted by common mode inductance LF 201's the inductance of straining and electric capacity. Of course, it is understood that in other embodiments, the common mode inductor LF201 may be replaced by a small-sized U-shaped inductor.
Further, the common mode inductor LF201 can generally adopt a large inductance, and the filtering effect on conducted interference can be increased by adopting the inductance. As shown in fig. 2, the first capacitor C201 mainly functions as a rectifying filter, generally requires a large capacity, and can be specifically determined according to the requirement of the output ripple voltage.
As shown in fig. 2, the second capacitor C202 is mainly used for filtering the output conducted interference of the common mode inductor LF201, generally, the capacity of the second capacitor C202 may be selected to be slightly smaller, and may generally be 4.7 to 47uF, and a better filtering effect may be obtained by appropriately selecting the capacity of the capacitor. Further, in some other embodiments, the second capacitor C202 may be replaced by a patch high voltage capacitor.
Through adopting this DC output end conduction filter circuit who is applied to POE power can do the filtering to POE power output's conducted interference well, reach fine filter effect, reduce the requirement to interfering with the production source, change through EMI fast easily.
As shown in fig. 3, the utility model provides a POE power, this POE power can include the embodiment of the utility model discloses be applied to the DC output conduction filter circuit of POE power.
As shown in fig. 3, the POE power source includes: the circuit comprises an EMI filter circuit, a rectifying filter circuit, a PFC circuit, a transformer, a rectifying tube, a PWM control integrated circuit, a driving tube Q103, a resistor R132, a photoelectric coupler and a secondary voltage sampling circuit. The input circuit shown in fig. 2 is composed of an EMI filter circuit, a rectifier filter circuit, a PFC circuit, a transformer, a rectifier tube, a PWM control integrated circuit, a driving tube Q103, a resistor R132, a photoelectric coupler, and a secondary voltage sampling circuit.
As shown in fig. 3, the input end of the EMI filter circuit is connected with an alternating current (AC input, 90 to 264Vac), the output end of the EMI filter circuit is connected with the input end of the rectification filter circuit, the output end of the rectification filter circuit is connected with the input end of the PFC circuit, the output end of the PFC circuit is connected with the input end of the transformer, the control end of the PFC circuit is connected with the PFC control output end of the PWM control integrated circuit, the drive control output end of the PWM control integrated circuit is connected with the gate of the driving tube Q103, the feedback end of the PWM control integrated circuit is connected with the photocoupler, the control end of the transformer is connected with the drain of the driving tube Q103, and the source of the driving tube Q103 is grounded through a resistor R132. The input of rectifier tube is connected to the first output of transformer, the first end of first electric capacity C201 and the first end of common mode inductance LF201 (the first end of filter inductance 10) are connected to the output of rectifier tube, the second end of first electric capacity C201 and the second end of common mode inductance LF201 (the second end of filter inductance 10) are connected to the second output of transformer, the first output (VOUT +) of POE power is connected to the third end of common mode inductance LF201 (the third end of filter inductance 10) and the first end of second electric capacity C202, the second output (VOUT-) of POE power is connected to the fourth end of common mode inductance LF201 (the fourth end of filter inductance 10) and the second end of second electric capacity C202.
Wherein, EMI filter circuit, rectification filter circuit, PFC circuit, transformer, rectifier tube, PWM control integrated circuit, optoelectronic coupler and secondary voltage sampling circuit all can adopt the conventional circuit of POE power, the utility model discloses no longer describe here.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and implement the present invention accordingly, which can not limit the protection scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention shall fall within the scope of the claims of the present invention. It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are considered to be within the scope of the invention as defined by the following claims.
Claims (10)
1. A DC output conduction filter circuit applied to a POE power supply, comprising: the filter circuit comprises a filter inductor, a first capacitor and a second capacitor;
the first end of the first capacitor is connected with the first end of the filter inductor and connected to the first end of the input circuit, and the second end of the first capacitor is connected with the second end of the filter inductor and connected to the second end of the input circuit;
the third end of the filter inductor is connected with the first output end of the DC output end conduction filter circuit applied to the POE power supply, and the fourth end of the filter inductor is connected with the second output end of the DC output end conduction filter circuit applied to the POE power supply.
2. The DC output conduction filter circuit applied to the POE power supply of claim 1, wherein the capacitance value of the first capacitor is greater than that of the second capacitor.
3. The DC output conduction filter circuit applied to POE power supply of claim 1, wherein the filter inductor comprises: the magnetic induction structure is arranged on the base; the magnetic induction structure includes: the coil structure is wound on the magnetic core;
the coil structure comprises a first coil and a second coil; the first coil and the second coil are separately wound on the magnetic core, and the first coil and the second coil are wound on the magnetic core by adopting a quarter winding method.
4. The DC output conduction filter circuit for POE power supply of claim 3, wherein the magnetic core is a ring-shaped magnetic core.
5. The DC output conduction filter circuit for POE power supply of claim 4, wherein the first coil and the second coil are separated and symmetrically wound on the ring-shaped magnetic core.
6. The DC output end conduction filter circuit applied to the POE power supply as recited in claim 4, wherein the annular magnetic core is a 15K high-permeability core.
7. The POE power supply DC output end conduction filter circuit as recited in claim 3, wherein the inductance of the filter inductor is 1-5 mH.
8. The DC output conduction filter circuit applied to POE power supply of claim 3, further comprising: the connecting device is arranged between the base and the magnetic induction structure so as to fix the magnetic induction structure on the base.
9. The DC output conduction filter circuit applied to POE power supplies of claim 8, wherein the base comprises a plurality of connection pins, the plurality of connection pins comprising a first connection pin, a second connection pin, a third connection pin and a fourth connection pin separately disposed on the base;
the first terminal of the first coil is correspondingly arranged on the first wiring pin, and the second terminal of the first coil is correspondingly arranged on the second wiring pin;
and the first terminal of the second coil is correspondingly arranged on the third wiring pin, and the second terminal of the second coil is correspondingly arranged on the fourth wiring pin.
10. POE power supply, characterized in that it comprises a DC output conduction filter circuit as claimed in claims 8 and 9 applied to POE power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022253183.1U CN214674872U (en) | 2020-10-10 | 2020-10-10 | DC output end conduction filter circuit applied to POE power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022253183.1U CN214674872U (en) | 2020-10-10 | 2020-10-10 | DC output end conduction filter circuit applied to POE power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214674872U true CN214674872U (en) | 2021-11-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022253183.1U Active CN214674872U (en) | 2020-10-10 | 2020-10-10 | DC output end conduction filter circuit applied to POE power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214674872U (en) |
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2020
- 2020-10-10 CN CN202022253183.1U patent/CN214674872U/en active Active
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