CN112260527A - Power supply filter circuit and power supply filter device - Google Patents
Power supply filter circuit and power supply filter device Download PDFInfo
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- CN112260527A CN112260527A CN202011126687.5A CN202011126687A CN112260527A CN 112260527 A CN112260527 A CN 112260527A CN 202011126687 A CN202011126687 A CN 202011126687A CN 112260527 A CN112260527 A CN 112260527A
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- filter circuit
- power supply
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- module
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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
- H02M1/14—Arrangements for reducing ripples from dc input or output
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Abstract
The invention discloses a power supply filter circuit and a power supply filter device, and belongs to the technical field of power supply filtering. The power supply filter circuit is composed of a power supply input end, an N-level filter circuit and a load power supply output end which are sequentially connected, wherein the N-level filter circuit realizes filtering in a frequency range of 150 kHz-320 MHz through the matching of an inductance module and an inductance module, wherein the inductance module is composed of a nanocrystalline soft magnetic material and/or a manganese zinc ferrite material, and the electromagnetic interference generated by the load end is effectively inhibited. The power supply filter device utilizes the two cavities of the base to isolate the inductance module and the capacitance module in the N-level filter circuit, thereby avoiding the condition that the working of the capacitance module is influenced by the overhigh temperature of the inductance module when the power supply filter device works and effectively achieving the purpose of heat dissipation and cooling.
Description
Technical Field
The invention relates to the technical field of power supply filtering, in particular to a power supply filtering circuit and a power supply filtering device.
Background
In the power supply of the electronic device, there are various kinds of external electromagnetic interference and electromagnetic interference (EMI) generated when the electronic device itself operates. These electromagnetic interferences affect the electronic devices operating in the environment by means of conduction and radiation. In the field of electric vehicles in particular, EMI generated by the motor controller of an electric vehicle during operation can be spatially coupled via the power line emission to influence the proper operation of the radio communication.
Disclosure of Invention
In view of the above problems, a power filter circuit and a power filter device are provided to suppress electromagnetic interference generated at a load side.
The invention provides a power supply filter circuit, which comprises a power supply input end, an N-stage filter circuit and a load power supply output end which are sequentially connected, wherein N is a positive integer greater than or equal to 1;
each stage of filter circuit comprises an inductance module and a capacitance module, and the capacitance module and the inductance module are connected in series;
the inductance module is made of any one of a nanocrystalline soft magnetic material and a manganese-zinc ferrite material.
Optionally, the capacitor module of the first stage filter circuit includes:
the first capacitor is bridged between the positive electrode and the negative electrode of the power supply input end;
and the second capacitor is connected with the first capacitor in parallel.
Optionally, the capacitor module of the post-N-1 stage filter circuit includes:
the third capacitor is connected between the positive output end and the negative output end of the inductance module of the previous stage of the filter circuit in a bridging manner;
a fourth capacitor connected in parallel with the third capacitor;
a fifth capacitor connected in parallel with the fourth capacitor;
the sixth capacitor is connected between the positive output end of the inductance module of the previous stage of the filter circuit and the power ground in a bridging manner;
a seventh capacitor connected in parallel with the sixth capacitor;
the eighth capacitor is connected between the negative output end of the inductance module of the previous stage of the filter circuit and the power ground in a bridging manner;
and the ninth capacitor is connected with the eighth capacitor in parallel.
The invention also provides a power supply filter device, which comprises the power supply filter circuit and also comprises:
the base comprises a first cavity and a second cavity, and a partition plate is arranged between the first cavity and the second cavity;
inductance modules of the power supply filter circuit are arranged in the first cavity, and the inductance modules are connected in series through a first positive electrode conductor and connected in series through a first negative electrode conductor;
the capacitor modules of the power supply filter circuit are all arranged on a PCB and are positioned in the second cavity, the PCB penetrates through the partition plate through a second positive electrode conductor and is electrically connected with the first positive electrode conductor, and the PCB penetrates through the partition plate through a second negative electrode conductor and is electrically connected with the first negative electrode conductor;
and the end cover is arranged at the top of the base.
Optionally, the first positive electrode conductor is a positive electrode copper bar.
Optionally, the first negative conductor is a negative copper bar.
Optionally, the second positive conductor is a screw, and the second negative conductor is a screw.
Optionally, the inductance module is a nanocrystalline soft magnetic ring or a manganese zinc ferrite magnetic ring.
Optionally, the power supply filter circuit is a 3-stage filter circuit;
the inductance module in the first stage of filter circuit is a nanocrystalline soft magnetic ring, the inductance module in the second stage of filter circuit is a manganese zinc ferrite magnetic ring, and the inductance module in the third stage of filter circuit is a nanocrystalline soft magnetic ring.
Optionally, the method further includes: and the grounding terminal is connected with the PCB of the power supply filter circuit.
The beneficial effects of the above technical scheme are that:
in the technical scheme, the power supply filter circuit is composed of a power supply input end, an N-stage filter circuit and a load power supply output end which are sequentially connected, the N-stage filter circuit realizes filtering in a frequency band range of 150 kHz-320 MHz through an inductance module composed of a nanocrystalline soft magnetic material and/or a manganese zinc ferrite material and the cooperation of the inductance module, and effectively inhibits electromagnetic interference generated by the load end. The power supply filter device utilizes the two cavities of the base to isolate the inductance module and the capacitance module in the N-level filter circuit, thereby avoiding the condition that the working of the capacitance module is influenced by the overhigh temperature of the inductance module when the power supply filter device works and effectively achieving the purpose of heat dissipation and cooling.
Drawings
FIG. 1 is a circuit diagram of an embodiment of a power filter circuit according to the present invention;
fig. 2 is an exploded view of an embodiment of the power filter apparatus according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The power supply filter circuit and the power supply filter device provided by the invention are suitable for the technical field of electric automobiles. The power supply filter circuit is composed of a power supply input end, an N-stage filter circuit and a load power supply output end which are sequentially connected, wherein the N-stage filter circuit realizes filtering in a frequency range of 150 kHz-300 MHz through an inductance module composed of a nanocrystalline soft magnetic material and/or a manganese zinc ferrite material and the cooperation of the inductance module, and effectively inhibits electromagnetic interference generated by the load end.
Example one
Referring to fig. 1, a power filter circuit of the present embodiment includes a power input terminal, an N-stage filter circuit, and a load power output terminal, which are connected in sequence, where N is a positive integer greater than or equal to 1;
each stage of filter circuit comprises an inductance module and a capacitance module, and the capacitance module and the inductance module are connected in series;
the inductance module is made of any one of a nanocrystalline soft magnetic material and a manganese-zinc ferrite material.
It should be noted that: when the inductance module adopts the nanocrystalline soft magnetic material, the inductance module can filter signals in the frequency range of 150 kHz-320 MHz. The wide-frequency-band impedance characteristic of the nanocrystalline soft magnetic material is high, and high-frequency electromagnetic interference signals can be inhibited; when the inductance module is made of manganese-zinc ferrite material, the inductance module can filter signals in the frequency range of 150 kHz-20 MHz. The Mn-Zn ferrite material belongs to a soft magnetic material with low pass and high resistance.
By way of example and not limitation, when the inductance module is made of a nanocrystalline soft magnetic material and the inductance is 15.0uH, signals in the frequency range of 150 kHz-100 MHz can be filtered; when the inductance module adopts manganese-zinc ferrite material and the inductance is 7.0uH, the filter can filter signals in the frequency range of 150 kHz-20 MHz.
In the embodiment, the power supply filter circuit is composed of a power supply input end, an N-stage filter circuit and a load power supply output end which are sequentially connected, the N-stage filter circuit realizes filtering in a frequency range of 150 kHz-320 MHz through an inductance module composed of a nanocrystalline soft magnetic material and/or a manganese zinc ferrite material and the cooperation of the inductance module, and effectively inhibits electromagnetic interference generated by the load end.
In a preferred embodiment, the capacitance module of the first stage filter circuit may include:
the first capacitor is bridged between the positive electrode and the negative electrode of the power supply input end;
and the second capacitor is connected with the first capacitor in parallel.
In this embodiment, the second capacitor is connected across the positive and negative input terminals of the inductor module in the filter circuit of the current stage, and the electromagnetic interference between the line and the line is suppressed by the first capacitor and the second capacitor.
It should be noted that: the first stage of filtering circuit may include a plurality of capacitors, and the frequency band of filtering is different for capacitance values of different capacitors.
In a preferred embodiment, the capacitance module of the post-N-1 stage filter circuit comprises:
the third capacitor is connected between the positive output end and the negative output end of the inductance module of the previous stage of the filter circuit in a bridging manner;
a fourth capacitor connected in parallel with the third capacitor;
a fifth capacitor connected in parallel with the fourth capacitor;
the sixth capacitor is connected between the positive output end of the inductance module of the previous stage of the filter circuit and the power ground in a bridging manner;
a seventh capacitor connected in parallel with the sixth capacitor;
the eighth capacitor is connected between the negative output end of the inductance module of the previous stage of the filter circuit and the power ground in a bridging manner;
and the ninth capacitor is connected with the eighth capacitor in parallel.
In this embodiment, the fifth capacitor is connected across the positive and negative input terminals of the inductor module of the filter circuit in the current stage, and the ninth capacitor is connected across the negative input terminal of the inductor module in the filter circuit in the current stage and the power ground. Electromagnetic interference between the line and the line is suppressed by the third capacitor, the fourth capacitor and the fifth capacitor, and electromagnetic interference between the line and the ground is suppressed by the sixth capacitor, the seventh capacitor, the eighth capacitor and the ninth capacitor.
Illustratively, referring to fig. 1, when N is 3 and the N-stage filter circuit is a 3-stage filter circuit, the one-stage filter circuit of the power filter circuit includes a first capacitance block and an inductance block L1, and the first capacitance block includes a capacitance Cx1 and a capacitance Cx 2; one end of the capacitor Cx1 forms the positive electrode + HV of the power input end, and the other end of the capacitor Cx1 forms the negative electrode-HV of the power input end and is used for being connected with the output end of the direct current power supply. The second-stage filter circuit comprises a second capacitance module and an inductance module L2, wherein the second capacitance module comprises a capacitance Cx3, a capacitance Cx4, a capacitance Cx5, a capacitance Cy1, a capacitance Cy2, a capacitance Cy3 and a capacitance Cy 4; the three-stage filter circuit comprises a third capacitor module and an inductance module L3, the third capacitor module comprises a capacitor Cx6, a capacitor Cx7, a capacitor Cx8, a capacitor Cy5, a capacitor Cy6, a capacitor Cy7 and a capacitor Cy8, and the output end of the load power supply is connected with a motor controller of the electric automobile; the positive output end of the inductance module L3 forms a positive electrode + DC of the load power output end, and the negative output end of the inductance module L3 forms a negative electrode-DC of the load power output end, and is used for being connected with the input end of the load end. The inductance module L1 and the inductance module L3 both adopt nanocrystalline soft magnetic materials and can filter signals within the frequency range of 150 kHz-100 MHz, and the inductance module L2 adopts manganese zinc ferrite materials and can filter signals within the frequency range of 150 kHz-20 MHz; the capacitance Cx1, the capacitance Cx2, the capacitance Cx3, the capacitance Cx4, the capacitance Cx5, the capacitance Cx6, the capacitance Cx7 and the capacitance Cx8 are used for suppressing the electromagnetic interference between the lines and the wires; the capacitors Cy1, Cy2, Cy3, Cy4, Cy5, Cy6, Cy7 and Cy8 are used for inhibiting electromagnetic interference between the line and the ground; the capacitance values of the capacitor Cy1 and the capacitor Cy2 are the same, the capacitance values of the capacitor Cy3 and the capacitor Cy4 are the same, the capacitance values of the capacitor Cy5 and the capacitor Cy6 are the same, and the capacitance values of the capacitor Cy7 and the capacitor Cy8 are the same. The power supply filter circuit can inhibit and reduce EMI interference generated during electric driving work, and reduce the influence on radio communication signals, so that the EMI interference during normal work of the automobile reaches the automobile CISPR25 standard (GB/T18655).
Example two
Referring to fig. 2, a power filter device of the present embodiment includes the power filter circuit described above, and further includes: a base 1 and an end cap 2.
The base 1 comprises a first cavity 11 and a second cavity 12, and a partition plate is arranged between the first cavity 11 and the second cavity 12; the inductance modules 4 of the power supply filter circuit are all arranged in the first cavity 11, and the inductance modules 4 are connected in series through a first positive conductor 5 and connected in series through a first negative conductor 6; the capacitor modules of the power supply filter circuit are arranged on the PCB 3 and located in the second cavity 12, the PCB 3 penetrates through the partition board through the second positive electrode conductor 8 and is electrically connected with the first positive electrode conductor 5, and the PCB 3 penetrates through the partition board through the second negative electrode conductor 7 and is electrically connected with the first negative electrode conductor 6.
Furthermore, the first cavity 11 is provided with a plurality of slots matching with the number and shape of the inductor modules 4, so that the inductor modules 4 are stably embedded in the slots.
And the end cover 2 is arranged at the top of the base 1.
In this embodiment, the power filter device utilizes two cavities of the base 1 to isolate the inductance module 4 and the capacitance module in the N-stage filter circuit, so that the condition that the working of the capacitance module is affected due to the overhigh temperature of the inductance module 4 when the power filter device works is avoided, and the purpose of heat dissipation and cooling is effectively achieved. The power supply filtering device has a simple structure and is convenient for automatic production and manufacturing.
In a preferred embodiment, the first positive conductor 5 is a positive copper bar; the first negative conductor 6 is a negative copper bar.
In this embodiment, the positive copper bar may sequentially pass through the inductance modules 4 in the N-stage filter circuit, and the negative copper bar may sequentially pass through the inductance modules 4 in the N-stage filter circuit, so as to electrically connect the inductance modules 4. The first cavity 11 is adapted to the shapes of the N inductance modules 4, the positive copper bar and the negative copper bar, so that the inductance modules 4, the positive copper bar and the negative copper bar can be stably fixed in the base 1. Two ends of the positive copper bar extend out of the base 1, and a positive electrode as a power supply input end and a positive electrode as a load power supply output end are respectively connected with a positive electrode of a power supply and a positive electrode of a load end; the two ends of the negative electrode copper bar extend out of the base 1, and the negative electrode of the power input end and the negative electrode of the load power output end are respectively connected with the negative electrode of the power supply and the negative electrode of the load end. The second cavity 12 is adapted to the shape of the PCB 3, so that the capacitor module can be stably fixed in the base 1.
It should be noted that: the base 1 is made of an insulating material.
In practical application, power filter device during operation, copper bar and inductance module 4 all can generate heat, because the highest temperature that the capacitance module bore is lower than the highest temperature of copper bar and inductance module 4, for example: the highest temperature born by the inductance module 4 is 110 degrees, and when the copper bar reaches 130 degrees, the capacitance module cannot bear the highest temperature. In this embodiment, the partition in the base 1 is used to separate the inductance module 4 from the copper bar and the inductance module 4, so that the temperature transmitted to the capacitor is reduced, and the purposes of heat dissipation and temperature reduction are achieved.
In a preferred embodiment, the second positive conductor 8 is a screw and the second negative conductor 7 is a screw. The screw rod penetrates through the PCB 3 and the partition plate to be electrically connected with the conductor of the first cavity 11.
In this embodiment, the components (capacitor modules) on the PCB 3 are electrically connected to the positive copper bar through the second positive conductor 8, and are electrically connected to the negative copper bar through the second negative conductor 7.
In a preferred embodiment, the inductance module 4 may be a nanocrystalline soft magnetic ring or a manganese-zinc ferrite magnetic ring.
When the inductance module 4 is made of the nano-crystalline soft magnetic material, the inductance module 4 can filter signals in the frequency range of 150 kHz-320 MHz. The wide-frequency-band impedance characteristic of the nanocrystalline soft magnetic material is high, and high-frequency electromagnetic interference signals can be inhibited; when the inductance module 4 is made of manganese-zinc ferrite, the inductance module 4 can filter signals in the frequency range of 150 kHz-20 MHz. The Mn-Zn ferrite material belongs to a soft magnetic material with low pass and high resistance.
In a preferred embodiment, the power supply filter circuit is a 3-stage filter circuit.
The inductance module 4 in the first stage filter circuit is a nanocrystalline soft magnetic ring, the inductance module 4 in the second stage filter circuit is a manganese zinc ferrite magnetic ring, and the inductance module 4 in the third stage filter circuit is a nanocrystalline soft magnetic ring.
In this embodiment, the first positive conductor 5 and the first negative conductor 6 respectively penetrate the nanocrystalline soft magnetic ring, the manganese-zinc ferrite magnetic ring and the nanocrystalline soft magnetic ring in sequence to realize the electrical connection between the inductor modules 4.
In a preferred embodiment, the power supply filtering device may further include: and the grounding terminal 9 is connected with the PCB 3 of the power supply filter circuit.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (10)
1. A power supply filter circuit is characterized by comprising a power supply input end, an N-stage filter circuit and a load power supply output end which are sequentially connected, wherein N is a positive integer greater than or equal to 1;
each stage of filter circuit comprises an inductance module and a capacitance module, and the capacitance module and the inductance module are connected in series;
the inductance module is made of any one of a nanocrystalline soft magnetic material and a manganese-zinc ferrite material.
2. The power filter circuit of claim 1, wherein the capacitance module of the first stage filter circuit comprises:
the first capacitor is bridged between the positive electrode and the negative electrode of the power supply input end;
and the second capacitor is connected with the first capacitor in parallel.
3. The power filter circuit of claim 1, wherein the capacitance module of the post-N-1 stage filter circuit comprises:
the third capacitor is connected between the positive output end and the negative output end of the inductance module of the previous stage of the filter circuit in a bridging manner;
a fourth capacitor connected in parallel with the third capacitor;
a fifth capacitor connected in parallel with the fourth capacitor;
the sixth capacitor is connected between the positive output end of the inductance module of the previous stage of the filter circuit and the power ground in a bridging manner;
a seventh capacitor connected in parallel with the sixth capacitor;
the eighth capacitor is connected between the negative output end of the inductance module of the previous stage of the filter circuit and the power ground in a bridging manner;
and the ninth capacitor is connected with the eighth capacitor in parallel.
4. A power supply filter device comprising the power supply filter circuit of claims 1-3, further comprising:
the base comprises a first cavity and a second cavity, and a partition plate is arranged between the first cavity and the second cavity;
inductance modules of the power supply filter circuit are arranged in the first cavity, and the inductance modules are connected in series through a first positive electrode conductor and connected in series through a first negative electrode conductor;
the capacitor modules of the power supply filter circuit are all arranged on a PCB and are positioned in the second cavity, the PCB penetrates through the partition plate through a second positive electrode conductor and is electrically connected with the first positive electrode conductor, and the PCB penetrates through the partition plate through a second negative electrode conductor and is electrically connected with the first negative electrode conductor;
and the end cover is arranged at the top of the base.
5. The power filter device according to claim 4, wherein the first positive conductor is a positive copper bar.
6. The power filter device of claim 4, wherein the first negative conductor is a negative copper bar.
7. The power filter device of claim 4, wherein the second positive conductor is a threaded rod and the second negative conductor is a threaded rod.
8. The power filter arrangement of claim 4, wherein the inductance module is a nanocrystalline soft magnetic ring or a manganese-zinc-ferrite magnetic ring.
9. The power supply filtering device according to claim 4, wherein the power supply filtering circuit is a 3-stage filtering circuit;
the inductance module in the first stage of filter circuit is a nanocrystalline soft magnetic ring, the inductance module in the second stage of filter circuit is a manganese zinc ferrite magnetic ring, and the inductance module in the third stage of filter circuit is a nanocrystalline soft magnetic ring.
10. The power supply filtering device according to claim 4, further comprising: and the grounding terminal is connected with the PCB of the power supply filter circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011126687.5A CN112260527A (en) | 2020-10-20 | 2020-10-20 | Power supply filter circuit and power supply filter device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011126687.5A CN112260527A (en) | 2020-10-20 | 2020-10-20 | Power supply filter circuit and power supply filter device |
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| Publication Number | Publication Date |
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| CN112260527A true CN112260527A (en) | 2021-01-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011126687.5A Pending CN112260527A (en) | 2020-10-20 | 2020-10-20 | Power supply filter circuit and power supply filter device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117175915A (en) * | 2023-11-02 | 2023-12-05 | 武汉嘉晨电子技术有限公司 | High-voltage heavy-current filtering component suitable for booster |
-
2020
- 2020-10-20 CN CN202011126687.5A patent/CN112260527A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117175915A (en) * | 2023-11-02 | 2023-12-05 | 武汉嘉晨电子技术有限公司 | High-voltage heavy-current filtering component suitable for booster |
| CN117175915B (en) * | 2023-11-02 | 2024-02-02 | 武汉嘉晨电子技术有限公司 | High-voltage heavy-current filtering component suitable for booster |
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