CN220553926U - Filter, vehicle-mounted power supply and vehicle - Google Patents
Filter, vehicle-mounted power supply and vehicle Download PDFInfo
- Publication number
- CN220553926U CN220553926U CN202322009556.4U CN202322009556U CN220553926U CN 220553926 U CN220553926 U CN 220553926U CN 202322009556 U CN202322009556 U CN 202322009556U CN 220553926 U CN220553926 U CN 220553926U
- Authority
- CN
- China
- Prior art keywords
- power supply
- mode inductor
- differential
- filter
- differential mode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001914 filtration Methods 0.000 claims description 37
- 239000003990 capacitor Substances 0.000 claims description 28
- 238000010586 diagram Methods 0.000 description 10
- 238000004804 winding Methods 0.000 description 10
- 230000005855 radiation Effects 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000001629 suppression Effects 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000004512 die casting Methods 0.000 description 2
- 239000006247 magnetic powder Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Landscapes
- Filters And Equalizers (AREA)
Abstract
The application provides a filter, a vehicle-mounted power supply and a vehicle. The filter comprises a circuit board and a filter circuit, wherein the filter circuit is connected with a power supply signal from a power supply port and filters the power supply signal, and comprises a first differential mode inductor and a second differential mode inductor, and the first differential mode inductor is connected in series on an anode line of the power supply port; the second differential mode inductor is connected in series with a negative electrode wire of the power supply port; the first differential-mode inductor and the second differential-mode inductor are arranged on the circuit board and are arranged in parallel along the current conduction direction of the power supply signal. The filter that this application provided can reduce the volume, reduce cost.
Description
Technical Field
The application relates to the technical field of electronics, in particular to a filter, a vehicle-mounted power supply and a vehicle.
Background
During the operation of the electronic device, the fundamental frequency and harmonic wave generated by the electronic device are conducted out along the power line, so that the conduction noise test and the radiation noise test of the electronic device are out of standard. In order to reach the radiation noise detection standard, the electronic device utilizes a filter to reduce the radiation noise of the electronic device. For example, in order to meet the requirements of electromagnetic compatibility regulations and improve the reliability of the vehicle-mounted product on the whole vehicle, a filter circuit is arranged at a power supply port of the vehicle-mounted product, and the filter circuit can be used for filtering electromagnetic noise generated by interference sources such as DCDC (direct current to direct current) and the like in the product and can also be used for improving the anti-interference capability on external noise on a power line.
In the prior art, a common mode inductor is set in a filter circuit to filter common mode noise. The common-mode inductor is a common-mode interference suppression device using ferrite and the like as magnetic cores, and is formed by symmetrically winding two coils with the same size and the same number of turns on the same ferrite annular magnetic core, wherein the winding directions of the coils are opposite to each other, so that a four-terminal device is formed. However, the coil diameter and the magnetic core of the common mode inductor are large, and the more winding turns, the larger the individual package is, resulting in a large space occupation of the filter circuit.
Disclosure of Invention
The application provides a filter, a vehicle-mounted power supply and a vehicle to solve the technical problem that the common mode inductance is large and causes the filter circuit occupation space to be large.
In order to solve the technical problems, the application provides a technical scheme that: the filter comprises a circuit board and a filter circuit, wherein the filter circuit is connected with a power supply signal from a power supply port and filters the power supply signal, and the filter circuit comprises a first differential mode inductor and a second differential mode inductor, and the first differential mode inductor is connected in series on an anode line of the power supply port; the second differential mode inductor is connected in series with a negative electrode wire of the power supply port; the first differential-mode inductor and the second differential-mode inductor are arranged on the circuit board and are arranged in parallel along the current conduction direction of the power supply signal.
The filter circuit further comprises a resonant circuit, and the resonant circuit and the second differential mode inductor are arranged on the negative electrode line in parallel.
The resonant circuit comprises a first capacitor and a first resistor, wherein one end of the first capacitor is connected with the first end of the second differential mode inductor; one end of the first resistor is connected with the other end of the first capacitor, and the other end of the first resistor is connected with the second end of the second differential mode inductor.
The filter circuit further comprises at least one low-impedance unit, and the low-impedance unit is connected between the positive electrode line and the negative electrode line in parallel.
The filter circuit further comprises a first low-impedance unit and a second low-impedance unit, wherein the first low-impedance unit is connected with the first end of the first differential mode inductor and the first end of the second differential mode inductor respectively;
the second low-impedance unit is respectively connected with the second end of the first differential mode inductor and the second end of the second differential mode inductor.
The inductance values of the first differential mode inductor and the second differential mode inductor are equal.
Wherein the current is greater than or equal to 20A and the inductance is greater than or equal to 4.7uH.
The filter circuit further comprises a third differential mode inductor, the third differential mode inductor is connected to the positive electrode line in series, one end of the third differential mode inductor is connected with the second low-impedance unit, and the other end of the third differential mode inductor is used as an output end of the electric signal.
In order to solve the technical problems, the application provides another technical scheme as follows: the vehicle-mounted power supply comprises a power supply port and the filter, wherein the power supply port is used for accessing an electric signal, and a filter circuit of the filter is electrically connected with the power supply port and used for filtering the electric signal.
In order to solve the technical problem, the present application provides another technical scheme as follows: a vehicle is provided, which comprises the above-mentioned vehicle-mounted power supply.
The beneficial effects of this application are: the filter provided by the application is provided with the circuit board and the filter circuit, wherein the filter circuit is connected with a power supply signal from a power supply port and filters the power supply signal, the filter circuit comprises a first differential mode inductor and a second differential mode inductor, and the first differential mode inductor is connected in series on an anode line of the power supply port; the second differential mode inductor is connected in series with a negative electrode wire of the power supply port; the first differential-mode inductor and the second differential-mode inductor are arranged on the circuit board and are arranged in parallel along the current conduction direction of the power supply signal. By the mode, the first differential mode inductor of the filter circuit is connected in series to the positive electrode wire of the power supply port, and the second differential mode inductor is connected in series to the negative electrode wire of the power supply port, so that common mode noise is filtered; further, the first differential mode inductor and the second differential mode inductor are arranged on the circuit board, and the first differential mode inductor and the second differential mode inductor are arranged in parallel along the current conduction direction of the power supply signal, so that common mode noise can be further filtered; still further, the filtering of common mode noise can be realized to this application filter circuit's first differential mode inductance and second differential mode inductance substitution common mode inductance, simultaneously, compare in the filter circuit that is provided with common mode inductance, the filter circuit of this application occupies the area of circuit board little, with low costs to the occupation space of filter is little and with low costs.
Drawings
For a clearer description of the technical solutions in the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art, wherein:
FIG. 1 is a schematic diagram of an embodiment of a filtering circuit provided herein;
FIG. 2 is a schematic diagram of an embodiment of a differential mode equivalent circuit of the filtering circuit of the present application;
FIG. 3 is a schematic circuit diagram of an embodiment of a common mode equivalent circuit of the filter circuit of the present application;
FIG. 4 is a circuit schematic of another embodiment of the filtering circuit provided herein;
FIG. 5 is a schematic circuit diagram of an embodiment of the vehicle power supply provided herein;
fig. 6 is a schematic structural view of an embodiment of a vehicle provided in the present application.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
It should be noted that, in the embodiment of the present application, directional indications (such as up, down, left, right, front, and rear … …) are referred to, and the directional indications are merely used to explain the relative positional relationship, movement conditions, and the like between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present application, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be regarded as not exist and not within the protection scope of the present application.
During the operation of the electronic device, the fundamental frequency and harmonic wave generated by the electronic device are conducted out along the power line, so that the conduction noise test and the radiation noise test of the electronic device are out of standard. In order to reach the radiation noise detection standard, the electronic device utilizes a filter to reduce the radiation noise of the electronic device. For example, in order to meet the requirements of electromagnetic compatibility regulations and improve the reliability of the vehicle-mounted product on the whole vehicle, a filter circuit is arranged at a power supply port of the vehicle-mounted product, and the filter circuit can be used for filtering electromagnetic noise generated by interference sources such as DCDC (direct current to direct current) and the like in the product and can also be used for improving the anti-interference capability on external noise on a power line.
The noise of the power supply port is divided into common mode noise and differential mode noise, so that the filter circuit arranged on the power supply port can be provided with a common mode inductance and a differential mode inductance to form a multi-stage filter circuit. The common mode inductance is a key device for filtering common mode noise, and the differential mode inductance is a key device for filtering differential mode noise. The common-mode inductor is a common-mode interference suppression device using ferrite and the like as magnetic cores, and is formed by symmetrically winding two coils with the same size and the same number of turns on the same ferrite annular magnetic core, wherein the winding directions of the coils are opposite to each other, so that a four-terminal device is formed. When common mode current flows, magnetic fluxes in the magnetic ring are mutually overlapped, so that the magnetic ring has quite large inductance, the coil presents high impedance, a strong damping effect is generated, and the suppression effect on the common mode current is achieved. However, when the common-mode inductance is used for a large-current power supply port, in order to meet the requirements of current capacity and impedance, the diameter of a common-mode inductance current coil is large, the number of winding turns is large, the magnetic core is large, the individual package of the common-mode inductance is large, and the patch production requirement cannot be met.
When the input current of the power supply port is larger (more than 20A), the common mode inductance is limited by the self winding process characteristic, the problems of large volume, low production efficiency and high cost caused by the fact that the patch production cannot be met are solved, and therefore the technical problems of large occupied space and high cost of a filter circuit provided with the common mode inductance are caused.
In order to solve the technical problem, the application provides a filter which can filter common mode noise and occupies small space and is low in cost.
The application provides a filter, this filter include circuit board and filter circuit, and filter circuit sets up on the circuit board, and wherein, filter circuit inserts the power supply signal from the power supply port to carry out the filter to the power supply signal. Referring to fig. 1, fig. 1 is a circuit schematic diagram of an embodiment of a filter circuit provided in the present application, as shown in fig. 1, a filter circuit 110 includes a first differential mode inductor L1 and a second differential mode inductor L2, wherein the first differential mode inductor L1 is connected in series to a positive line of a power supply port, and the second differential mode inductor L2 is connected in series to a negative line of the power supply port. The first differential-mode inductor L1 and the second differential-mode inductor L2 are disposed on a circuit board (not shown), and the first differential-mode inductor L1 and the second differential-mode inductor L2 are disposed in parallel along a current conduction direction of the power supply signal.
It is to be understood that the power supply port is used for accessing the positive line and the negative line of the power supply signal, and the positive line of the power supply port is connected with the positive line of the load such as the switch power supply, and the negative line of the power supply port is connected with the negative line of the load such as the switch power supply. The common differential mode inductor of the power supply port is an integrated inductor, the structure of the common differential mode inductor comprises a base body and a winding body, the base body is formed by embedding the winding body into metal magnetic powder and die-casting the inside of the metal magnetic powder, pins are lead pins of the winding body, and the lead pins are directly formed on the surface of the base body. Compared with the traditional inductor, the common mode inductor has higher inductance and smaller leakage inductance, and the structural design of the surface-mounted element (Surface Mount Device) and the aluminum alloy powder are formed by die casting, so that the common mode inductor has the advantages of low characteristic impedance, integrated forming structure, accurate inductance, small size, large current quantity, low cost and the like. The first differential mode inductor L1 of the filter circuit 110 is connected in series to the positive line of the power supply port, and the second differential mode inductor L2 is connected in series to the negative line of the power supply port, so that common mode noise can be filtered. In order to further improve the capability of the filter circuit 110 to filter common mode noise, when the first differential mode inductor L1 and the second differential mode inductor L2 of the filter circuit 110 are arranged on the circuit board, the first differential mode inductor L1 and the second differential mode inductor L2 are arranged in parallel along the current conduction direction of the power supply signal, so that the directions of magnetic force lines are the same when common mode current passes through the inductor coil, the induced magnetic field is enhanced, and the inductive reactance is increased, so that the capability of the filter circuit 110 to filter common mode noise is further improved. The first differential-mode inductor L1 and the second differential-mode inductor L2 may be patch-type differential-mode inductors or plug-in differential-mode inductors, compared with common-mode inductors with special structures, the first differential-mode inductor L1 and the second differential-mode inductor L2 of the two-terminal device have smaller volumes than the common-mode inductors even though they are plug-in differential-mode inductors, and the manufacturing process of the first differential-mode inductor L1 and the second differential-mode inductor L2 is simpler than that of the common-mode inductors, and correspondingly has lower cost. The filter circuit 110 using the first differential-mode inductor L1 and the second differential-mode inductor L2 to filter the common-mode noise occupies a small area of the circuit board and is low in cost compared with other filter circuits using the common-mode inductor to filter the common-mode noise.
The filter provided by the application is provided with the circuit board and the filter circuit 110, wherein the filter circuit 110 is connected with a power supply signal from a power supply port and filters the power supply signal, the filter circuit 110 comprises a first differential mode inductor L1 and a second differential mode inductor L2, and the first differential mode inductor L1 is connected in series on the positive line of the power supply port; the second differential mode inductor L2 is connected in series to the negative electrode line of the power supply port; the first differential-mode inductor L1 and the second differential-mode inductor L2 are disposed on the circuit board, and the first differential-mode inductor L1 and the second differential-mode inductor L2 are disposed in parallel along the current conduction direction of the power supply signal. In this way, the first differential mode inductor L1 of the filter circuit 110 of the present application is connected in series to the positive line of the power supply port, and the second differential mode inductor L2 is connected in series to the negative line of the power supply port, so as to filter out common mode noise; further, the first differential-mode inductor L1 and the second differential-mode inductor L2 are arranged on the circuit board, and the first differential-mode inductor L1 and the second differential-mode inductor L2 are arranged in parallel along the current conduction direction of the power supply signal, so that common-mode noise can be further filtered; still further, the first differential mode inductance L1 and the second differential mode inductance L2 of the filter circuit 110 of the present application can replace the common mode inductance to realize the filtering of common mode noise, and meanwhile, compared with the filter circuit 110 provided with the common mode inductance, the filter circuit 110 of the present application occupies a small area of the circuit board, and has low cost, thereby the occupied space of the filter is small and the cost is low.
Optionally, in order to improve the capability of the first differential-mode inductor L1 and the second differential-mode inductor L2 to filter out common-mode noise, the inductance values of the first differential-mode inductor L1 and the second differential-mode inductor L2 are equal. The magnitudes of the common mode impedance and the differential mode impedance can be controlled by adjusting the magnitudes of the inductance values of the first differential mode inductance L1 and the second differential mode inductance L2 at the same time. The impedance characteristic of the filter circuit 110 is mainly represented by the overall differential-mode inductance Ld and the common-mode inductance Lm in the filter circuit 110, referring to fig. 2 to 3, fig. 2 is a schematic circuit diagram of an embodiment of a differential-mode equivalent circuit of the filter circuit of the present application;
fig. 3 is a schematic circuit diagram of an embodiment of a common mode equivalent circuit of the filtering circuit of the present application. If the inductance values of the first differential-mode inductance L1 and the second differential-mode inductance L2 are denoted as L, as shown in fig. 2, the formula of the differential-mode inductance is:
Ld＝L1+L2＝2L
as shown in fig. 3, the formula of the common mode inductance is:
Lm＝L3＝L/2
according to the impedance formula:
Z＝j2πfL
therefore, the common mode impedance and the differential mode impedance of the filter circuit 110 can be controlled by adjusting the inductance value of the first differential mode inductance L1 and the second differential mode inductance L2.
Optionally, when the current of the electric signal accessed by the power supply port is greater than or equal to 20A, the inductance value of the first differential mode inductance L1 and the second differential mode inductance L2 is greater than or equal to 4.7uH. In this embodiment, the inductance value of the first differential-mode inductor L1 and the second differential-mode inductor L2 is greater than or equal to 4.7uH, so that the filter circuit 110 adapts to the requirement that the input current of the access electric signal is greater than 20A.
In other embodiments, the first differential-mode inductor L1 may be a first differential-mode inductor unit with a plurality of inductors connected in series, and the second differential-mode inductor may be a second differential-mode inductor unit with a plurality of inductors connected in series.
Optionally, in order to improve the filtering capability of the filtering circuit 110, the filtering circuit 110 may further be provided with a multi-stage filtering unit, such as a filtering capacitor and a filtering inductor. However, the arrangement of the multistage filtering unit has a problem that the filtering circuit 110 is easy to resonate, in order to adjust the resonance characteristic of the filtering circuit 110, with continued reference to fig. 1, the filtering circuit 110 further includes a resonant circuit 112, and the resonant circuit 112 and the second differential-mode inductor L2 are arranged in parallel on the negative line of the power supply port.
For example, when the multistage filtering unit mainly includes a capacitor and/or an inductor, when load noise is superimposed on a resonance point, the noise will be amplified, resulting in a problem of exceeding the radiation test. In this case, the reference resonance point frequencyThe quality factor q=rl/2pi L (RL is load impedance) of the resonance when the resonance is at the power supply portWhen the resonant circuit 112 is connected in parallel to the second differential-mode inductor L2 of the negative line, it is equivalent to changing the inductance of the filter circuit 110 to change the frequency and amplitude of the resonance point.
In the embodiment, the resonant circuit 112 is arranged, and the resonant circuit 112 and the second differential mode inductor L2 are arranged on the negative electrode line of the power supply port in parallel. In the above manner, the resonant circuit 112 is configured to change the inductance of the first differential-mode inductor L1 and the second differential-mode inductor L2 in the filter circuit 110 to change the frequency and the amplitude of the resonance point, so as to improve the problem of load noise amplification.
Optionally, the resonant circuit 112 includes a first capacitor C1 and a first resistor R1, one end of the first capacitor C1 is connected to the first end of the second differential-mode inductor L2, the other end of the first capacitor C1 is connected to one end of the first resistor R1, and the other end of the first resistor R1 is connected to the second end of the second differential-mode inductor L2.
Optionally, in order to improve the filtering performance of the filtering circuit 110, the filtering circuit 110 further includes at least one low impedance unit (reference numeral 113 or 114), and the low impedance unit is connected in parallel between the positive line and the negative line of the power supply port. For example, after the power supply port is connected with an electric signal, the electric signal firstly filters low-frequency noise through a low-impedance unit, and then filters common-mode noise through a first differential-mode inductor L1 and a second differential-mode inductor L2; or the electric signal firstly filters common mode noise through the first differential mode inductance L1 and the second differential mode inductance L2, and then filters low-frequency noise through the low-impedance unit.
The present embodiment improves the filtering performance of the filtering circuit 110 by providing at least one low impedance unit, wherein the low impedance unit is connected in parallel between the positive line and the negative line of the power supply port, so as to filter the low frequency noise of the electrical signal through the low impedance unit.
Optionally, the filter circuit 110 further includes a first low impedance unit 113 and a second low impedance unit 114, where the first low impedance unit 113 and the second low impedance unit 114 are connected in parallel between the positive line and the negative line of the power supply port, and the first low impedance unit 113 is connected to the first end of the first differential mode inductor L1 and the first end of the second differential mode inductor L2 respectively; the second low impedance unit 114 is connected to the second end of the first differential-mode inductor L1 and the second end of the second differential-mode inductor L2, respectively.
Specifically, the first low impedance unit 113 includes a second capacitor C2, a third capacitor C3, and a fourth capacitor C4, and the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 are disposed in parallel. The second low impedance unit 114 includes a fifth capacitor C5, a sixth capacitor C6, and a seventh capacitor C7, and the fifth capacitor C5, the sixth capacitor C6, and the seventh capacitor C7 are disposed in parallel.
In a specific application scenario, when the input current of the power supply port connected with the electric signal is larger than 20A, the inductance value of the first differential mode inductor and the second differential mode inductor is larger than or equal to 4.7uH; when the capacitance values of the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 are the same, the capacitance value is 0.001 uf-4.7 uf; when the capacitance values of the fifth capacitor C5, the sixth capacitor C6 and the seventh capacitor C7 are the same, the capacitance value is 0.001uf to 4.7uf.
The present embodiment further improves the filtering performance of the filter circuit 110 by providing the first low impedance unit 113 and the second low impedance unit 114.
Optionally, referring to fig. 4, fig. 4 is a schematic circuit diagram of another embodiment of the filtering circuit according to the present application, as shown in fig. 4, the filtering circuit 110 further includes a third differential mode inductor L4, where the third differential mode inductor L4 is connected in series to the positive line of the power supply port, one end of the third differential mode inductor L4 is connected to the second low impedance unit 114, and the other end of the third differential mode inductor L4 is used as an output end of the electrical signal. It can be understood that the filter circuit 110 of the present embodiment is a fourth-order filter circuit 110, the first low impedance unit 113 is used as the first-order filter circuit 110 of the filter circuit 110, the first differential mode inductance L1 and the second differential mode inductance L2 are used as the second-order filter circuit 110 of the filter circuit 110, the second low impedance unit 114 is used as the third-order filter circuit 110 of the filter circuit 110, and the third differential mode inductance L4 is used as the fourth-order filter circuit 110 of the filter circuit 110.
The filter circuit 110 of the present embodiment further includes a third differential-mode inductor L4, wherein the third differential-mode inductor L3 is connected in series to the positive line, and one end of the third differential-mode inductor L4 is connected to the second low-impedance unit 114, and the other end of the third differential-mode inductor L4 is used as an output end of the electrical signal. In this way, the filtering circuit 110 of the present embodiment sets the third differential mode inductance L4 after the second low impedance unit 114 to filter out differential mode noise, thereby improving the noise filtering capability of the filtering circuit 110.
Referring to fig. 5, fig. 5 is a schematic circuit diagram of an embodiment of the vehicle power supply provided in the present application, as shown in fig. 5, the vehicle power supply 20 includes a power supply port 21, a switch circuit 22 and a filter (not labeled in the figure), where the filter is connected to the power supply port 21 and the switch circuit 22, respectively, and is used for filtering an electrical signal. Wherein the filter is any one of the above filter embodiments. For example, an electrical signal is supplied from the power supply port 21, filtered by a filter, and then supplied to the switching circuit 22. Wherein the power supply port 21 and the switching circuit 22 may be provided on the circuit board of the filter at the same time.
The present application further provides a vehicle, referring to fig. 6, fig. 6 is a schematic structural diagram of an embodiment of the vehicle provided in the present application, and as shown in fig. 6, the vehicle 30 includes a vehicle-mounted power source (not labeled in the drawings), where the vehicle-mounted power source is any one of the vehicle-mounted power sources in the above embodiment of the vehicle-mounted power source.
In the description of the present application, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, mechanism, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, mechanisms, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
The foregoing is only the embodiments of the present application, and not the patent scope of the present application is limited by the foregoing description, but all equivalent structures or equivalent processes using the contents of the present application and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the patent protection scope of the present application.
Claims (10)
1. A filter, comprising:
a circuit board;
and a filter circuit for accessing a power supply signal from a power supply port and filtering the power supply signal, wherein the filter circuit comprises:
the first differential mode inductor is connected in series with the positive electrode wire of the power supply port;
the second differential mode inductor is connected in series with the negative electrode wire of the power supply port;
the first differential mode inductor and the second differential mode inductor are arranged on the circuit board, and the first differential mode inductor and the second differential mode inductor are arranged in parallel along the current conduction direction of the power supply signal.
2. The filter of claim 1, wherein the filter circuit further comprises:
and the resonant circuit is arranged on the negative electrode line in parallel with the second differential mode inductor.
3. The filter of claim 2, wherein the resonant circuit comprises:
one end of the first capacitor is connected with the first end of the second differential mode inductor;
and one end of the first resistor is connected with the other end of the first capacitor, and the other end of the first resistor is connected with the second end of the second differential mode inductor.
4. The filter of claim 2, wherein the filter circuit further comprises at least one low impedance unit connected in parallel between the positive and negative lines.
5. The filter of claim 4, wherein the filter circuit further comprises:
the first low-impedance unit is respectively connected with the first end of the first differential mode inductor and the first end of the second differential mode inductor;
and the second low-impedance unit is respectively connected with the second end of the first differential mode inductor and the second end of the second differential mode inductor.
6. The filter of any of claims 1-5, wherein the first differential-mode inductance and the second differential-mode inductance have equal inductance values.
7. The filter of claim 6, wherein the current is greater than or equal to 20A and the inductance is greater than or equal to 4.7uH.
8. The filter of claim 5, wherein the filter circuit further comprises:
and the third differential mode inductor is connected in series on the positive electrode wire, one end of the third differential mode inductor is connected with the second low-impedance unit, and the other end of the third differential mode inductor is used as an output end of the electric signal.
9. A vehicle-mounted power supply, characterized by comprising:
a power supply port and the filter of any one of claims 1-8, the power supply port being for accessing an electrical signal, a filtering circuit of the filter being electrically connected to the power supply port for filtering the electrical signal.
10. A vehicle, characterized by comprising:
the vehicle-mounted power supply of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322009556.4U CN220553926U (en) | 2023-07-27 | 2023-07-27 | Filter, vehicle-mounted power supply and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322009556.4U CN220553926U (en) | 2023-07-27 | 2023-07-27 | Filter, vehicle-mounted power supply and vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220553926U true CN220553926U (en) | 2024-03-01 |
Family
ID=90007650
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322009556.4U Active CN220553926U (en) | 2023-07-27 | 2023-07-27 | Filter, vehicle-mounted power supply and vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220553926U (en) |
-
2023
- 2023-07-27 CN CN202322009556.4U patent/CN220553926U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20080100400A1 (en) | Filter package | |
| US6937115B2 (en) | Filter having parasitic inductance cancellation | |
| US7548137B2 (en) | Generalized cancellation of inductor winding capacitance | |
| US10498309B2 (en) | Common mode inductor apparatus having coil winding wound in multiple winding areas, and related winding method of common mode inductor apparatus and electromagnetic interference filter circuit | |
| EP3823164A1 (en) | Noise filter | |
| CN203554278U (en) | A household electrical appliance and an EMI filter circuit thereof | |
| US20220165484A1 (en) | Hybrid inductive device | |
| CN220553926U (en) | Filter, vehicle-mounted power supply and vehicle | |
| CN109524195B (en) | Common mode choke coil and wireless charging circuit | |
| CN108417935B (en) | Planar filter | |
| CN104702234A (en) | Electromagnetic interference filter applicable to high-voltage Hall sensors | |
| CN202996476U (en) | Stacked staggered winding based planar EMI (electro-magnetic interference) filter | |
| CN209374246U (en) | A kind of inductor, filter circuit and functional circuit | |
| CN214541851U (en) | Hybrid inductor device | |
| JP7275588B2 (en) | Electronic component, method for manufacturing electronic component, and method for noise reduction | |
| CN209948952U (en) | Power supply double-circuit filter | |
| CN203734632U (en) | Electromagnetic interference filter suitable for high voltage Hall voltage sensor | |
| CN111614094B (en) | Electromagnetic interference filter circuit | |
| CN211791257U (en) | Filter circuit and vehicle | |
| TWI757189B (en) | Inductor device | |
| CN110943707A (en) | Filter circuit and electronic device | |
| CN201629721U (en) | Integrated XY capacitive noise filter | |
| CN110212753A (en) | A kind of power supply two-way filter | |
| CN214125147U (en) | Filter circuit and direct current charging module | |
| JP2004504798A (en) | Power filter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |