CN214959286U - Electromagnetic compatibility filtering and protecting circuit of power management chip, power supply and vehicle - Google Patents
Electromagnetic compatibility filtering and protecting circuit of power management chip, power supply and vehicle Download PDFInfo
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- CN214959286U CN214959286U CN202023147973.8U CN202023147973U CN214959286U CN 214959286 U CN214959286 U CN 214959286U CN 202023147973 U CN202023147973 U CN 202023147973U CN 214959286 U CN214959286 U CN 214959286U
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Abstract
The utility model discloses an electromagnetic compatibility filtering and protection circuit, power and vehicle of power management chip, electromagnetic compatibility filtering and protection circuit include: the input end of the common mode filter circuit is connected with the power supply end of the power supply and is used for filtering common mode interference signals of the power supply; the input end of the differential mode filter circuit is connected with the output end of the common mode filter circuit and is used for filtering differential mode interference signals of the power supply; and the input end of the hierarchical filter circuit is connected with the output end of the differential mode filter circuit, and the output end of the hierarchical filter circuit is connected with the power supply end of the power supply management chip, so that clutter signals of various frequencies in the power supply can be filtered and supplied to the power supply management chip. Therefore, the power supply is filtered, stable power supply input is provided for the power management chip, and the working stability and reliability of the power management chip are improved.
Description
Technical Field
The utility model relates to a power management technical field especially relates to an electromagnetic compatibility of power management chip filters and protection circuit, a power and a vehicle.
Background
With the development of the new and the fourth automobile, the electronic parts of the automobile are applied more and more, and the EMC performance requirements of the parts are more and more strict due to the increasingly complex electromagnetic environment, at present, in the design of the parts, a DC-DC (direct current power conversion) power management chip is often used, and if the chip is not designed with perfect EMC, multiple EMC experiments of the parts may be unqualified, and even the electromagnetic environment of the whole automobile or even the driving safety may be badly affected.
However, the EMC scheme of the related art only performs simple filtering, and cannot meet the current standard requirements, and the operational reliability and stability of the power management chip cannot be effectively ensured.
SUMMERY OF THE UTILITY MODEL
The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, the utility model discloses a first aim at provides a power management chip's electromagnetic compatibility filtering and protection circuit, can carry out the filtering to power supply, provides stable power input for power management chip, improves power management chip's job stabilization nature and reliability.
A second object of the present invention is to provide a power supply.
A third object of the present invention is to provide a vehicle.
In order to achieve the above object, the utility model discloses power management chip's electromagnetic compatibility filtering and protection circuit that the first aspect provided, include: the input end of the common mode filter circuit is connected with the power supply end of a power supply and used for filtering common mode interference signals of the power supply; the input end of the differential mode filter circuit is connected with the output end of the common mode filter circuit and is used for filtering differential mode interference signals of the power supply; the input end of the hierarchical filter circuit is connected with the output end of the differential mode filter circuit, and the output end of the hierarchical filter circuit is connected with the power supply end of the power supply management chip, so that clutter signals of various frequencies in the power supply can be filtered and supplied to the power supply management chip.
According to the utility model discloses an electromagnetic compatibility filtering and protection circuit of power management chip, common mode interference signal through common mode filtering power supply to through differential mode filtering circuit filtering power supply's differential mode interference signal, and through the clutter signal of multiple frequency among the level filtering circuit filtering power supply, and provide the power management chip. Therefore, the power supply is filtered, stable power supply input is provided for the power management chip, and the working stability and reliability of the power management chip are improved.
In addition, according to the utility model discloses above-mentioned embodiment's electromagnetic compatibility filtering and protection circuit of power management chip can also have following additional technical characterstic:
in some examples, the common mode filtering circuit includes: and the first end of the common mode inductor is connected with the anode of the power supply, the second end of the common mode inductor is connected with the cathode of the power supply, and the third end and the fourth end of the common mode inductor are correspondingly connected with the input end of the differential mode filter circuit.
In some examples, there is no ground plane below the common mode inductance.
In some examples, the differential mode filtering circuit includes: a first end of the first differential-mode inductor is connected with a third end of the common-mode inductor, and a second end of the first differential-mode inductor is connected with an input end of the hierarchical filter circuit; and a first end of the second differential-mode inductor is connected with a fourth end of the common-mode inductor, and a second end of the second differential-mode inductor is connected with an input end of the hierarchical filter circuit.
In some examples, the hierarchical filtering circuit includes: the power supply management chip comprises a first capacitor, a second capacitor and a third capacitor which are connected in parallel, wherein one end of the first capacitor, one end of the second capacitor and one end of the third capacitor after being connected in parallel are respectively connected with the second end of the first differential mode inductor and the positive power supply end of the power supply management chip, and the other end of the first capacitor, the other end of the second capacitor and the other end of the third capacitor after being connected in parallel are respectively connected with the second end of the second differential mode inductor and the negative power supply end of the power supply management chip.
In some examples, the first capacitor is proximate to the differential mode filter circuit, the third capacitor is proximate to the power management chip, and the second capacitor is between the first capacitor and the third capacitor.
In some examples, the emc filtering and protecting circuit of the power management chip further includes: and the anode of the reverse connection prevention diode is connected with the anode of the power supply, and the cathode of the reverse connection prevention diode is connected with the first end of the common mode inductor.
In some examples, the emc filtering and protection circuit of the power management chip further includes: and the cathode of the protection diode is connected with the cathode of the reverse connection preventing diode, and the anode of the protection diode is connected with the cathode of the power supply.
In order to achieve the above object, the present invention provides a power supply according to a second aspect, which includes a power management chip and an electromagnetic compatibility filter and protection circuit of the power management chip as described above.
According to the utility model discloses a power adopts the power management chip and as above the electromagnetic compatibility filtering and the protection circuit of power management chip, can carry out the filtering to power supply, provide stable power input for the power management chip, improve the job stabilization nature and the reliability of power management chip.
In order to achieve the above object, a third aspect of the present invention provides a vehicle including the power supply as described above.
According to the utility model discloses a vehicle adopts above-mentioned power, can carry out the filtering to power supply, provides stable power input for the power management chip, improves the job stabilization nature and the reliability of power management chip.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a block diagram of an electromagnetic compatibility filtering and protection circuit of a power management chip according to an embodiment of the present invention;
fig. 2 is an electrical schematic diagram of an electromagnetic compatibility filtering and protection circuit of a power management chip according to an embodiment of the present invention;
fig. 3 is a block schematic diagram of a power supply according to an embodiment of the present invention;
fig. 4 is a block diagram of a vehicle according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
The following describes an electromagnetic compatibility filtering and protecting circuit, a power supply and a vehicle of a power management chip according to an embodiment of the present invention with reference to the drawings.
Fig. 1 is a block diagram of an electromagnetic compatibility filtering and protection circuit of a power management chip according to the embodiment of the present invention.
As shown in fig. 1, the emc filtering and protecting circuit 100 of the power management chip includes: common mode filter circuit 10, differential mode filter circuit 20, and hierarchical filter circuit 30.
Specifically, as shown in fig. 2, an input terminal of the common mode filter circuit 10 is connected to a power supply terminal VCC of the power supply, so as to filter a common mode interference signal of the power supply; the input end of the differential mode filter circuit 20 is connected with the output end of the common mode filter circuit 10 for filtering the differential mode interference signal of the power supply; the input end of the hierarchical filter circuit 30 is connected to the output end of the differential-mode filter circuit 20, and the output end of the hierarchical filter circuit 30 is connected to the power supply end of the power management chip 200, so as to filter out clutter signals of multiple frequencies in the power supply and provide the clutter signals to the power management chip 200.
That is to say, in the embodiment of the utility model, power management chip's electromagnetic compatibility filtering and protection circuit 100 accessible common mode filter circuit 10 filtering power supply's common mode interference signal, the differential mode interference signal through differential mode filter circuit 20 filtering power supply to through the clutter signal of multiple frequency in the level filter circuit 30 filtering power supply, and provide power management chip 200, thereby, provide stable power input for power management chip 200, improve power management chip 200's job stabilization nature and reliability.
Further, as shown in fig. 2, the common mode filter circuit 10 includes: and a common mode inductor Lg.
Specifically, as shown in fig. 2, a first end of the common mode inductor Lg is connected to the positive electrode of the power supply, a second end of the common mode inductor Lg is connected to the negative electrode of the power supply, and a third end and a fourth end of the common mode inductor Lg are correspondingly connected to the input end of the differential mode filter circuit 20.
Optionally, in an embodiment of the present invention, the common mode inductor Lg is ACM1211, and is configured to filter a differential mode interference signal of the power supply when the power supply flows through the common mode inductor Lg.
Further, there is no ground plane below the common mode inductor Lg.
It should be understood that, when the common mode filter circuit 10 is wired, there is no ground layer below the common mode inductor Lg, so that the common mode electromagnetic noise is prevented from affecting the filtering effect of the common mode filter circuit 10 through ground front-to-back stage coupling.
Further, as shown in fig. 2, the differential mode filter circuit 20 includes: a first differential mode inductance L1 and a second differential mode inductance L2.
Specifically, as shown in fig. 2, a first terminal of the first differential-mode inductor L1 is connected to a third terminal of the common-mode inductor Lg, and a second terminal of the first differential-mode inductor L1 is connected to an input terminal of the hierarchical filter circuit 30; a first terminal of the second differential-mode inductor L2 is connected to the fourth terminal of the common-mode inductor Lg, and a second terminal of the second differential-mode inductor L2 is connected to the input terminal of the hierarchical filter circuit 30.
Optionally, in the embodiment of the present invention, the model number of the first differential mode inductor L1 and the second differential mode inductor L2 is MPZ2012S101ATD25, for filtering the differential mode interference signal of the power supply when the common mode filter circuit 10 outputs the power supply.
Further, as shown in fig. 2, the hierarchical filter circuit 30 includes: the capacitor comprises a first capacitor C1, a second capacitor C2 and a third capacitor C3 which are connected in parallel.
Specifically, as shown in fig. 2, one end of the first capacitor C1, the second capacitor C2, and the third capacitor C3 connected in parallel is connected to the second end of the first differential-mode inductor L1 and the positive power terminal of the power management chip 200, and the other end of the first capacitor C1, the second capacitor C2, and the third capacitor C3 connected in parallel is connected to the second end of the second differential-mode inductor L2 and the negative power terminal of the power management chip 200.
Optionally, in the embodiment of the present invention, the capacitance value of the first capacitor C1 is 10uF for filtering the low frequency clutter signal, the capacitance value of the second capacitor C2 is 47nF for filtering the intermediate frequency clutter signal, and the capacitance value of the third capacitor C3 is 68pF for filtering the high frequency clutter signal.
Further, as shown in fig. 2, the first capacitor C1 is close to the differential mode filter circuit 20, the third capacitor C3 is close to the power management chip 200, and the second capacitor C2 is located between the first capacitor C1 and the third capacitor C3.
It should be understood that, in the embodiment of the present invention, the low frequency clutter signals, the intermediate frequency clutter signals and the high frequency clutter signals can be filtered by the first capacitor C1, the second capacitor C2 and the third capacitor C3 connected in parallel, so that the power supply after the clutter signals of multiple frequencies are filtered is provided to the power management chip 200.
Further, as shown in fig. 2, the emc filtering and protecting circuit 100 of the power management chip further includes: the diode D1 is reverse connected.
Specifically, as shown in fig. 2, an anode of the reverse connection preventing diode D1 is connected to an anode of the power supply, and a cathode of the reverse connection preventing diode D1 is connected to the first end of the common mode inductor Lg.
Optionally, the reverse connection prevention diode D1 is a TVS diode, and is in the model of PMEG10030ELP, and can be used for power supply reverse connection prevention.
It can be understood that the emc filtering and protection circuit 100 of the power management chip can perform power supply reverse connection protection through the reverse connection prevention diode D1, thereby preventing negative voltage from passing through the emc filtering and protection circuit 100 of the power management chip to provide protection for the common mode filtering circuit 10, the differential mode filtering circuit 20, the level filtering circuit 30 and the power management chip 200.
Further, as shown in fig. 2, the emc filtering and protecting circuit 100 of the power management chip further includes: the diode D2 is protected.
Specifically, as shown in fig. 2, the cathode of the protection diode D2 is connected to the cathode of the reverse connection prevention diode D1, and the anode of the protection diode D2 is connected to the cathode of the power supply.
Optionally, the protection diode D2 is a TVS diode, model number SMAJ33A, and may be used for surge protection, electrostatic protection, power line transient anti-interference protection, and the like.
It should be noted that, when the protection diode D2 is wired, the line width may be set according to the power consumption of the emc filter and protection circuit 100 of the power management chip, for example, 3 to 4 times of the normal line width, so as to bleed off energy in a very short time to provide protection for the common mode filter circuit 10, the differential mode filter circuit 20, the level filter circuit 30 and the power management chip 200.
Therefore, in the embodiment of the utility model, power management chip's electromagnetic compatibility filtering and protection circuit 100 passes through common mode filter circuit 10, differential mode filter circuit 20 and level filter circuit 30 carry out the filtering to power supply, for power management chip 200 provides stable power input, and simultaneously, through preventing reverse diode D1 and protection diode D2, carry out for example surge protection, electrostatic protection, power cord transient state anti-interference protection, reverse plug protection etc. to power supply, protection power management chip 200 is not damaged, thereby, improve power management chip 200's job stabilization nature and reliability.
To sum up, according to the utility model discloses a power management chip's electromagnetic compatibility filtering and protection circuit, common mode interference signal through the filtering power supply is strained to the common mode interference signal through differential mode filter circuit filtering power supply to and through the clutter signal of multiple frequency in the level filter circuit filtering power supply, and provide the power management chip. Therefore, the power supply is filtered, stable power supply input is provided for the power management chip, and the working stability and reliability of the power management chip are improved.
Fig. 3 is a block diagram of a power supply according to an embodiment of the present invention.
As shown in fig. 3, the power supply 1000 includes the power management chip 200 and the electromagnetic compatibility filter and protection circuit 100 according to the embodiment of the present invention.
It should be noted that the utility model discloses a power 1000's embodiment and aforesaid the utility model discloses a power management chip's electromagnetic compatibility filtering and protection circuit 100's embodiment one-to-one is no longer repeated here.
To sum up, according to the utility model discloses a power adopts the power management chip and as above the electromagnetic compatibility filtering and the protection circuit of power management chip, can carry out the filtering to power supply, provides stable power input for the power management chip, improves the job stabilization nature and the reliability of power management chip.
Fig. 4 is a block diagram of a vehicle according to an embodiment of the present invention.
As shown in fig. 4, the vehicle 2000 includes a power supply 1000 according to the embodiment of the present invention.
It should be noted that, the embodiment of the present invention of the vehicle 2000 corresponds to the embodiment of the power supply 1000 according to the embodiment of the present invention, and is not repeated herein.
To sum up, according to the utility model discloses a vehicle adopts above-mentioned power, can carry out the filtering to power supply, provides stable power input for the power management chip, improves the job stabilization nature and the reliability of power management chip.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (10)
1. An electromagnetic compatibility filtering and protecting circuit of a power management chip is characterized by comprising:
the input end of the common mode filter circuit is connected with the power supply end of a power supply and used for filtering common mode interference signals of the power supply;
the input end of the differential mode filter circuit is connected with the output end of the common mode filter circuit and is used for filtering differential mode interference signals of the power supply;
the input end of the hierarchical filter circuit is connected with the output end of the differential mode filter circuit, and the output end of the hierarchical filter circuit is connected with the power supply end of the power supply management chip, so that clutter signals of various frequencies in the power supply can be filtered and supplied to the power supply management chip.
2. The emc filtering and protection circuit of claim 1, wherein the common mode filtering circuit comprises:
and the first end of the common mode inductor is connected with the anode of the power supply, the second end of the common mode inductor is connected with the cathode of the power supply, and the third end and the fourth end of the common mode inductor are correspondingly connected with the input end of the differential mode filter circuit.
3. The emc filtering and protection circuit of claim 2, wherein there is no ground plane below the common mode inductor.
4. The emc filtering and protection circuit of claim 2, wherein the differential mode filtering circuit comprises:
a first end of the first differential-mode inductor is connected with a third end of the common-mode inductor, and a second end of the first differential-mode inductor is connected with an input end of the hierarchical filter circuit;
and a first end of the second differential-mode inductor is connected with a fourth end of the common-mode inductor, and a second end of the second differential-mode inductor is connected with an input end of the hierarchical filter circuit.
5. The emc filtering and protection circuit of claim 4, wherein the hierarchical filtering circuit comprises:
the power supply management chip comprises a first capacitor, a second capacitor and a third capacitor which are connected in parallel, wherein one end of the first capacitor, one end of the second capacitor and one end of the third capacitor after being connected in parallel are respectively connected with the second end of the first differential mode inductor and the positive power supply end of the power supply management chip, and the other end of the first capacitor, the other end of the second capacitor and the other end of the third capacitor after being connected in parallel are respectively connected with the second end of the second differential mode inductor and the negative power supply end of the power supply management chip.
6. The emc filtering and protection circuit of claim 5, wherein the first capacitor is located near the differential mode filter circuit, the third capacitor is located near the power management chip, and the second capacitor is located between the first capacitor and the third capacitor.
7. The emc filtering and protection circuit of claim 2, further comprising:
and the anode of the reverse connection prevention diode is connected with the anode of the power supply, and the cathode of the reverse connection prevention diode is connected with the first end of the common mode inductor.
8. The emc filtering and protection circuit of claim 7, further comprising:
and the cathode of the protection diode is connected with the cathode of the reverse connection preventing diode, and the anode of the protection diode is connected with the cathode of the power supply.
9. A power supply comprising a power management chip and an emc filter and protection circuit of the power management chip of any of claims 1-8.
10. A vehicle characterized by comprising a power supply according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023147973.8U CN214959286U (en) | 2020-12-23 | 2020-12-23 | Electromagnetic compatibility filtering and protecting circuit of power management chip, power supply and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023147973.8U CN214959286U (en) | 2020-12-23 | 2020-12-23 | Electromagnetic compatibility filtering and protecting circuit of power management chip, power supply and vehicle |
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| Publication Number | Publication Date |
|---|---|
| CN214959286U true CN214959286U (en) | 2021-11-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202023147973.8U Active CN214959286U (en) | 2020-12-23 | 2020-12-23 | Electromagnetic compatibility filtering and protecting circuit of power management chip, power supply and vehicle |
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| CN (1) | CN214959286U (en) |
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Effective date of registration: 20220322 Granted publication date: 20211130 |