CN111726100A - Filter circuit and vehicle-mounted electronic equipment - Google Patents
Filter circuit and vehicle-mounted electronic equipment Download PDFInfo
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- CN111726100A CN111726100A CN202010476782.1A CN202010476782A CN111726100A CN 111726100 A CN111726100 A CN 111726100A CN 202010476782 A CN202010476782 A CN 202010476782A CN 111726100 A CN111726100 A CN 111726100A
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- 239000003990 capacitor Substances 0.000 claims abstract description 257
- 230000009467 reduction Effects 0.000 claims abstract description 108
- 239000011324 bead Substances 0.000 claims description 96
- 238000010586 diagram Methods 0.000 description 31
- 239000003638 chemical reducing agent Substances 0.000 description 19
- 238000000034 method Methods 0.000 description 11
- 238000004891 communication Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 6
- 206010063385 Intellectualisation Diseases 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
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- 238000001914 filtration Methods 0.000 description 2
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/09—Filters comprising mutual inductance
Abstract
The embodiment of the application discloses a filter circuit and vehicle-mounted electronic equipment, and belongs to the field of circuits. The embodiment of the application comprises the following steps: the filter circuit comprises a noise reduction device. When current flows through the noise reduction device and the connection point of the common mode inductor, the current in the middle frequency band of the current flows through the noise reduction device and then is led into the ground through the capacitor. Therefore, the current flowing through the part of the frequency band of the common mode inductor is reduced, so that the resonance between the capacitor and the common mode inductor is relieved, the electromagnetic noise of the resonance frequency band is reduced, and the signal-to-noise ratio of the output signal is improved.
Description
Technical Field
The embodiment of the application relates to the field of circuits, in particular to a filter circuit.
Background
Electromagnetic compatibility (EMC) refers to the ability of a device or system to perform satisfactorily in its electromagnetic environment without generating intolerable electromagnetic interference to any device in its environment.
In the process of developing the modern automobile into intellectualization, more electronic component supports are required for realizing the intellectualization of the automobile. In order to ensure the reliability of the operation of the vehicle, the quality inspection mechanism and the vehicle enterprises generally inspect the vehicle according to relevant EMC standards. Therefore, the electronic components on the vehicle are designed to have EMC to prevent the electromagnetic noise from interfering with each other. In the prior art, the external communication port of each electronic component is a critical point for examining the EMC characteristics of the electronic component, and the communication port of the electronic component needs to be designed with a filter so that the electronic component can meet the relevant EMC standard requirements.
Existing communication ports are often filtered by a filter circuit including an inductor and a capacitor, so as to reduce electromagnetic noise on a cable of the communication port. However, the capacitance and inductance included in the filter circuit may generate resonance, and electromagnetic noise is raised in the resonance frequency band, thereby possibly causing the product to fail to meet EMC standard requirements.
Disclosure of Invention
The embodiment of the application provides a filter circuit and vehicle-mounted electronic equipment, and current of a current middle frequency band flows through the noise reduction device and then is led into the ground through a first capacitor. Therefore, the current of the partial frequency band does not pass through the common-mode inductor before flowing through the capacitor, so that the resonance between the capacitor and the inductor is relieved, and the electromagnetic noise of the resonance frequency band is reduced.
A first aspect of the present application provides a reset circuit, comprising: the noise reduction circuit comprises a first capacitor module and an inductor module, wherein the first capacitor module comprises a first capacitor and a second capacitor, and the inductor module comprises a common-mode inductor, a first noise reduction device and a second noise reduction device; the first capacitor is connected with the second capacitor in series; the first end of the first capacitor is connected with the first end of the first noise reduction device and the first end of the common-mode inductor; the first end of the second capacitor is connected with the first end of the second noise reduction device and the second end of the common-mode inductor; the second end of the first noise reduction device is connected with the third end of the common-mode inductor; the second end of the second noise reduction device is connected with the fourth end of the common-mode inductor; the second end of the first capacitor is connected with the second end of the second capacitor, and the second end of the first capacitor and the second end of the second capacitor are grounded; when a first current flows through the first noise reduction device and a connection point of the common mode inductor, the current of a first current middle frequency band flows through the first noise reduction device and then is led into the ground through the first capacitor; when a second current flows through the second noise reduction device and the connection point of the common mode inductor, the current of the middle frequency band of the second current flows through the second noise reduction device and then is conducted into the ground through the second capacitor.
In the embodiment of the present application, the filter circuit includes a noise reduction device. When current flows through the noise reduction device and the connection point of the common mode inductor, the current in the middle frequency band of the current flows through the noise reduction device and then is led into the ground through the capacitor. Therefore, the current flowing through the part of the frequency band of the common mode inductor is reduced, so that the resonance between the capacitor and the common mode inductor is relieved, the electromagnetic noise of the resonance frequency band is reduced, and the signal-to-noise ratio of the output signal is improved.
In a possible implementation manner of the first aspect, the circuit: the filter circuit further comprises a second capacitor module, wherein the second capacitor module comprises a third capacitor and a fourth capacitor; the third capacitor is connected with the fourth capacitor in series; the first end of the third capacitor is connected with the second end of the first noise reduction device and the third end of the common-mode inductor; a first end of the fourth capacitor is connected with a second end of the second noise reduction device and a fourth end of the common mode inductor; and the second end of the third capacitor is connected with the second end of the fourth capacitor, and the second ends of the third capacitor and the fourth capacitor are grounded.
In this embodiment, the filter circuit further includes a second capacitor module, and the current in the middle frequency band of the first current may be conducted to the ground through a third capacitor in the second capacitor module. Similarly, the current in the middle frequency band of the second current may be conducted to the ground through the fourth capacitor in the second capacitor module. Therefore, the noise reduction efficiency of the filter circuit is further improved.
In a possible implementation manner of the first aspect, the circuit: the first noise reducing device comprises a first resistor and the second noise reducing device comprises a second resistor; when a first current flows through the first resistor and the connection point of the common mode inductor, the current of the middle frequency band of the first current flows through the first resistor and then is led into the ground through the first capacitor; when a second current flows through the second resistor and the connection point of the common mode inductor, the current of the middle frequency band of the second current flows through the second resistor and then is conducted into the ground through the second capacitor.
In the embodiment of the application, a specific implementation mode of the noise reduction device is provided, and the realizability of the scheme is improved.
In a possible implementation manner of the first aspect, the circuit: the first noise reduction device comprises a first magnetic bead, and the second noise reduction device comprises a second magnetic bead; when a first current flows through a connection point of the first magnetic bead and the common-mode inductor, the current of a middle frequency division band of the first current flows through the first magnetic bead and then is led into the ground through the first capacitor; when a second current flows through the second magnetic bead and the connection point of the common mode inductor, the current of the middle frequency band of the second current flows through the second magnetic bead and then is conducted to the ground through the second capacitor.
In the embodiment of the application, the first noise reduction device comprises a first magnetic bead, the second noise reduction device comprises a second magnetic bead, when the noise frequency in the current is extremely high, the magnetic bead is adopted as the noise reduction device to prevent the impedance attenuation under the condition of high-frequency noise, and the low-frequency current is prevented from passing through the noise reduction device, so that the reliability of the filter circuit is improved.
In a possible implementation manner of the first aspect, the circuit: the first noise reduction device comprises a fifth capacitor, and the second noise reduction device comprises a sixth capacitor; when a first current flows through the fifth capacitor and the connection point of the common mode inductor, the current of the middle frequency band of the first current flows through the fifth capacitor and then is led into the ground through the first capacitor; when a second current flows through the connection point of the sixth capacitor and the common mode inductor, the current of the middle frequency band of the second current flows through the sixth capacitor and then is conducted to the ground through the second capacitor.
In the embodiment of the present application, the first noise reduction device includes a fifth capacitor, the second noise reduction device includes a sixth capacitor, the capacitors have a better isolation effect on the low-frequency current, and the filtering circuit provided by this possible implementation manner further improves the signal-to-noise ratio of the output signal.
In a possible implementation manner of the first aspect, the circuit: the first noise reduction device comprises a first resistor and a fifth capacitor, and the second noise reduction device comprises a second resistor and a sixth capacitor; the first resistor is connected with the fifth capacitor in series; the second resistor is connected with the sixth capacitor in series; when a first current flows through a connection point of the fifth capacitor and the common mode inductor, or when the first current flows through a connection point of the first resistor and the common mode inductor, the current of a middle frequency band of the first current flows through the fifth capacitor and the first resistor, and then is led into the ground through the first capacitor; when a second current flows through the connection point of the sixth capacitor and the common mode inductor, or when the second current flows through the connection point of the second resistor and the common mode inductor, the current of the middle frequency band of the second current flows through the sixth capacitor and the second resistor, and then is conducted to the ground through the second capacitor.
In the embodiment of the application, a specific implementation mode of the noise reduction device is provided, and the realizability of the scheme is improved.
In a possible implementation manner of the first aspect, the circuit: the first noise reduction device comprises a first resistor and a first magnetic bead, and the second noise reduction device comprises a second resistor and a second magnetic bead; the first resistor is connected with the first magnetic bead in series; the second resistor is connected with the second magnetic beads in series; when a first current flows through the connection point of the first resistor and the common-mode inductor, or when the first current flows through the connection point of the first magnetic bead and the common-mode inductor, the current of a middle frequency band of the first current flows through the first resistor and the first magnetic bead and then is conducted to the ground through the first capacitor; when a second current flows through the connection point of the second resistor and the common-mode inductor, or when the second current flows through the connection point of the second magnetic bead and the common-mode inductor, the current of a middle frequency band of the second current flows through the second resistor and the second magnetic bead and then is conducted to the ground through the second capacitor.
In the embodiment of the application, a specific implementation mode of the noise reduction device is provided, and the realizability of the scheme is improved.
In a possible implementation manner of the first aspect, the circuit: the first noise reduction device comprises a first resistor and a first inductor, and the second noise reduction device comprises a second resistor and a second inductor; the first resistor is connected with the first inductor in series; the second resistor is connected with the second inductor in series; when a first current flows through the connection point of the first resistor and the common mode inductor, or when the first current flows through the connection point of the first inductor and the common mode inductor, the current of a middle frequency band of the first current flows through the first resistor and the first inductor and then is led into the ground through the first capacitor; when a second current flows through the connection point of the second resistor and the common mode inductor, or when the second current flows through the connection point of the second inductor and the common mode inductor, the current of the middle frequency band of the second current flows through the second resistor and the second inductor, and then is conducted to the ground through the second capacitor.
In the embodiment of the application, a specific implementation mode of the noise reduction device is provided, and the realizability of the scheme is improved.
In a possible implementation manner of the first aspect, the circuit: the first noise reduction device comprises a first magnetic bead and a fifth capacitor, and the second noise reduction device comprises a second magnetic bead and a sixth capacitor; the first magnetic bead is connected with the fifth capacitor in series; the second magnetic bead is connected with the sixth capacitor in series; when a first current flows through a connection point of the first magnetic bead and the common-mode inductor, or when the first current flows through a connection point of the fifth capacitor and the common-mode inductor, the current of a middle frequency division band of the first current flows through the first magnetic bead and the fifth capacitor and then is led into the ground through the first capacitor; when a second current flows through the connection point of the second magnetic bead and the common-mode inductor, or when the second current flows through the connection point of the sixth capacitor and the common-mode inductor, the current of the middle frequency band of the second current flows through the second magnetic bead and the sixth capacitor, and then is conducted to the ground through the second capacitor.
In the embodiment of the application, a specific implementation mode of the noise reduction device is provided, and the realizability of the scheme is improved.
In a possible implementation manner of the first aspect, the circuit: the first noise reduction device comprises a first magnetic bead and a first inductor, and the second noise reduction device comprises a second magnetic bead and a second inductor; the first magnetic bead is connected with the first inductor in series; the second magnetic bead is connected with the second inductor in series; when a first current flows through a connection point of the first magnetic bead and the common-mode inductor, or when the first current flows through a connection point of the first inductor and the common-mode inductor, the current of a middle frequency band of the first current flows through the first magnetic bead and the first inductor, and then is conducted to the ground through the first capacitor; when a second current flows through the connection point of the second magnetic bead and the common-mode inductor, or when the second current flows through the connection point of the second inductor and the common-mode inductor, the current of a middle frequency band of the second current flows through the second magnetic bead and the second inductor, and then is conducted to the ground through the second capacitor.
In the embodiment of the application, a specific implementation mode of the noise reduction device is provided, and the realizability of the scheme is improved.
In a possible implementation manner of the first aspect, the circuit: the first noise reduction device comprises a fifth capacitor and a first inductor, and the second noise reduction device comprises a sixth capacitor and a second inductor; the fifth capacitor is connected with the first inductor in series; the sixth capacitor is connected with the second inductor in series; when a first current flows through a connection point of the fifth capacitor and the common mode inductor, or when the first current flows through a connection point of the first inductor and the common mode inductor, the current of a middle frequency band of the first current flows through the fifth capacitor and the first inductor, and then is led into the ground through the first capacitor; when a second current flows through a connection point of the sixth capacitor and the common mode inductor, or when the second current flows through a connection point of the second inductor and the common mode inductor, the current of a middle frequency band of the second current flows through the sixth capacitor and the second inductor, and then is conducted to the ground through the second capacitor.
A second aspect of the present application provides an in-vehicle electronic device, the in-vehicle electronic component including: a first functional module and a filter circuit, where the reset circuit is the filter circuit described in the first aspect or any one of the possible implementation manners of the first aspect.
According to the technical scheme, the embodiment of the application has the following advantages:
the embodiment of the application provides a filter circuit and vehicle-mounted electronic equipment, wherein the filter circuit comprises a noise reduction device. When current flows through the noise reduction device and the connection point of the common mode inductor, the current in the middle frequency band of the current flows through the noise reduction device and then is led into the ground through the capacitor. Therefore, the common mode noise current flowing through the part of frequency band of the common mode inductor is reduced, resonance between the capacitor and the common mode inductor is relieved, electromagnetic noise of the resonance frequency band is reduced, and the signal-to-noise ratio of the output signal is improved.
Drawings
FIG. 1 is a schematic structural diagram of a vehicle-mounted electronic device provided in an embodiment of the present application;
fig. 2 is a schematic diagram of an embodiment of a filter circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of another embodiment of a filter circuit provided in an embodiment of the present application;
fig. 4 is a schematic diagram of another embodiment of a filter circuit provided in an embodiment of the present application;
fig. 5 is a schematic diagram of another embodiment of a filter circuit provided in an embodiment of the present application;
fig. 6 is a schematic diagram of another embodiment of a filter circuit provided in an embodiment of the present application;
fig. 7 is a schematic diagram of another embodiment of a filter circuit according to an embodiment of the present disclosure;
fig. 7a is a schematic diagram of another embodiment of a filter circuit according to an embodiment of the present disclosure;
fig. 8 is a schematic diagram of another embodiment of a filter circuit provided in an embodiment of the present application;
fig. 8a is a schematic diagram of another embodiment of a filter circuit according to an embodiment of the present disclosure;
fig. 9 is a schematic diagram of another embodiment of a filter circuit according to an embodiment of the present disclosure;
fig. 9a is a schematic diagram of another embodiment of a filter circuit according to an embodiment of the present disclosure;
fig. 10 is a schematic diagram of another embodiment of a filter circuit according to an embodiment of the present disclosure;
fig. 10a is a schematic diagram of another embodiment of a filter circuit according to an embodiment of the present disclosure;
fig. 11 is a schematic diagram of another embodiment of a filter circuit according to an embodiment of the present disclosure;
fig. 11a is a schematic diagram of another embodiment of a filter circuit according to an embodiment of the present disclosure;
fig. 12 is a schematic diagram of another embodiment of a filter circuit according to an embodiment of the present disclosure;
fig. 12a is a schematic diagram of another embodiment of a filter circuit according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one skilled in the art from the embodiments given herein are intended to be within the scope of the invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Electromagnetic compatibility (EMC) refers to the ability of a device or system to perform satisfactorily in its electromagnetic environment without generating intolerable electromagnetic interference to any device in its environment.
In the process of developing the modern automobile into intellectualization, more electronic component supports are required for realizing the intellectualization of the automobile. In order to ensure the reliability of the operation of the vehicle, the quality inspection mechanism and the vehicle enterprises generally inspect the vehicle according to relevant EMC standards. Therefore, the electronic components on the vehicle are designed to have EMC to prevent the electromagnetic noise from interfering with each other. In the prior art, the external communication port of each electronic component is a critical point for examining the EMC characteristics of the electronic component, and the communication port of the electronic component needs to be designed with a filter so that the electronic component can meet the relevant EMC standard requirements.
In physics, there is a concept called resonance, and when the frequency of the driving force is equal to the natural frequency of the system, the amplitude of the forced vibration of the system is the largest, and this phenomenon is called resonance. Resonance in the circuit is also really meant: when the frequency excited in the circuit is equal to the natural frequency of the circuit, the amplitude of the electromagnetic oscillation of the circuit will also peak. Resonance often occurs in circuits that include an inductor L and a capacitor C. Existing communication ports are often filtered by a filter circuit including an inductor and a capacitor, so as to reduce electromagnetic noise on a cable of the communication port. However, the capacitance and inductance included in the filter circuit may generate resonance, and electromagnetic noise is raised in the resonance frequency band, thereby possibly causing the product to fail to meet EMC standard requirements.
To solve the above problems of the existing vehicle-mounted electronic device, the embodiment of the application provides a filter circuit and a vehicle-mounted electronic device. The filter circuit comprises a noise reduction device. When the current flows through the noise reduction device and the connection point of the common mode inductor, the current of the middle frequency band of the current flows through the noise reduction device and then is led into the ground through the first capacitor. Therefore, the current of the partial frequency band does not pass through the common-mode inductor before flowing through the capacitor, so that the resonance between the capacitor and the inductor is relieved, and the electromagnetic noise of the resonance frequency band is reduced.
Fig. 1 is a schematic structural diagram of a vehicle-mounted electronic device provided in an embodiment of the present application.
Referring to fig. 1, as shown in fig. 1, an in-vehicle electronic device 100 provided in the embodiment of the present application includes: the circuit comprises a first functional module 101, a filter circuit 102 and a power module 103, wherein the filter circuit 102 comprises a first capacitor module and an inductor module.
The first functional module 101 is connected to the filter circuit 102 and the power module 103, respectively.
The first functional module 101 is a module for realizing the functions of the in-vehicle electronic device.
The filter circuit 102 is a module for reducing noise in the electrical signal generated by the first functional module 101, and can improve the signal-to-noise ratio of the electrical signal output by the first functional module 101.
The power supply module 103 supplies power to the electronic device. The power module 103 supplies power required by all components in the electronic device. Whether the current and the voltage provided by the power module are stable or not directly influences the working performance and the service life of the electronic equipment.
Optionally, the vehicle-mounted electronic device provided in the embodiment of the present application may be a driver, the vehicle-mounted electronic device provided in the embodiment of the present application may also be a vehicle-mounted charger, and the vehicle-mounted electronic device provided in the embodiment of the present application may also be other electronic devices, which is not limited herein specifically.
The filter circuit provided by the embodiment of the present application is described based on the structural schematic diagram of the vehicle-mounted electronic device described in fig. 1.
Fig. 2 is a schematic diagram of an embodiment of a filter circuit according to an embodiment of the present disclosure.
Referring to fig. 2, as shown in fig. 2, the filter circuit according to the embodiment of the present application includes: the noise reduction circuit comprises a first capacitance module and an inductance module, wherein the first capacitance module comprises a first capacitor C1 and a second capacitor C2, and the inductance module comprises a common-mode inductor L1, a first noise reduction device A1 and a second noise reduction device A2;
the first capacitor C1 is connected in series with the second capacitor C2, and the first end of the first capacitor C1 is connected to the first end of the first noise reducer a1 and the first end of the common mode inductor L1. A first terminal of the second capacitor C2 is connected to a first terminal of the second noise reducer a2 and to a second terminal of the common mode inductor L1. The second end of the first noise reducer A1 is connected with the third end of the common-mode inductor L1; the second terminal of the second noise reducer a2 is connected to the fourth terminal of the common-mode inductor L1. The second terminal of the first capacitor C1 is connected to the second terminal of the second capacitor C2, and the second terminal of the first capacitor C1 is grounded to the second terminal of the second capacitor C2.
In the embodiment of the present application, after the first functional module outputs the first current, when the first current flows through the connection point of the first noise reduction device a1 and the common mode inductor L1, the current in the middle frequency band of the current flows through the first noise reduction device a1 and then is conducted to the ground through the first capacitor C1. In this way, the current in the partial frequency band does not pass through the common-mode inductor L1 before flowing through the first capacitor C1, so that the resonance between the first capacitor C1 and the common-mode inductor L1 is relieved, and the electromagnetic noise in the resonance frequency band is reduced. The currents in the other frequency bands in the first current pass through the common-mode inductor L1 and are then output from the port. Furthermore, the filter circuit achieves a filtering effect on the current output by the first functional module.
In the embodiment of the present application, after passing through the first noise reduction device, the current in the middle frequency band of the first current is led to the ground through the first capacitor, and the current in the middle frequency band is generally a high-frequency current.
Illustratively, when the frequency of the electrical signal is a differential mode signal of 500kHz, high frequency noise in the frequency band of 10kHz-100MHz is coupled to the line. The device provider may define the capacitance of C1 so that noise reduction may be achieved by directing this high frequency noise through the first capacitor C1 to ground.
In the prior art, if there is no first noise reduction element a1, resonance will occur between the common mode inductor L1 and the first capacitor C1, for example, when the resonance point is 2MHz, 2MHz noise in high frequency noise will be amplified, and the amplified noise output port will reduce the signal-to-noise ratio of the output signal of the port.
In the embodiment of the present application, after the first noise reduction element a1 is introduced into the circuit, when the high-frequency noise in the first current flows through the connection point of the first noise reduction device a1 and the common mode inductor L1, the high-frequency noise in the first current flows through the first noise reduction device a1 and then is conducted to the ground through the first capacitor C1. Therefore, high-frequency noise does not pass through the common-mode inductor L1, resonance between the first capacitor C1 and the common-mode inductor L1 is relieved, and the signal-to-noise ratio of an output signal is improved.
In the embodiment of the present application, when the frequency of the electrical signal is a differential mode signal of 500kHz, a high-frequency noise in a frequency band of 10kHz to 100MHz is coupled on a line as an example to explain the operating principle of the filter circuit provided in the embodiment of the present application, the frequency of the electrical signal may also be other frequencies, and the noise coupled on the line may also be a noise of other frequencies, which is not limited herein.
When the second current flows through the connection point of the second noise reducer a2 and the common-mode inductor L1, the current in the middle frequency band of the second current flows through the second noise reducer a2 and then is conducted to the ground through the second capacitor C2.
In the embodiment of the present application, after the current in the middle frequency band of the second current flows through the second noise reducer a2, the current enters the ground through the second capacitor C2, and the current in the middle frequency band is generally a high-frequency current.
Illustratively, when the frequency of the electrical signal is a differential mode signal of 500kHz, high frequency noise in the frequency band of 10kHz-100MHz is coupled to the line. The device provider may define the capacitance of C2 so that noise reduction may be achieved by directing this high frequency noise through the second capacitor C2 to ground.
In the prior art, if there is no second noise reducer a2, resonance will occur between the common mode inductor L1 and the second capacitor C2, for example, when the resonance point is 2MHz, 2MHz noise in high frequency noise will be amplified, and the amplified noise output port will reduce the signal-to-noise ratio of the output signal of the port.
In the embodiment of the present application, after the second noise reducer a2 is introduced into the circuit, when the high-frequency noise in the second current flows through the connection point of the second noise reducer a2 and the common mode inductor L1, the high-frequency noise in the second current flows through the second noise reducer a2 and then is conducted to the ground through the second capacitor C2. Therefore, high-frequency noise does not pass through the common-mode inductor L1, resonance between the second capacitor C2 and the common-mode inductor L1 is relieved, and the signal-to-noise ratio of an output signal is improved.
In the embodiment of the present application, when the frequency of the electrical signal is a differential mode signal of 500kHz, a high-frequency noise in a frequency band of 10kHz to 100MHz is coupled on a line as an example to explain the operating principle of the filter circuit provided in the embodiment of the present application, the frequency of the electrical signal may also be other frequencies, and the noise coupled on the line may also be a noise of other frequencies, which is not limited herein.
Fig. 3 is a schematic diagram of an embodiment of a filter circuit according to an embodiment of the present disclosure.
Referring to fig. 3, as shown in fig. 3, optionally, the filter circuit may further include a second capacitor module, where the second capacitor module includes a third capacitor C3 and a fourth capacitor C4.
In the embodiment of the present application, the third capacitor C3 is connected in series with the fourth capacitor C4, and the first end of the third capacitor C3 is connected to the second end of the first noise reducer a1 and the third end of the common mode inductor L1. A first terminal of the fourth capacitor C4 is connected to the second terminal of the second noise reducer a2 and to the fourth terminal of the common mode inductor L1. The second terminal of the third capacitor C3 is connected to the second terminal of the fourth capacitor C4, and the second terminal of the third capacitor C3 is connected to the second terminal of the fourth capacitor C4.
In this embodiment, the filter circuit further includes a second capacitor module, and the current in the middle frequency band of the first current may be introduced to the ground through a third capacitor C3 in the second capacitor module. Similarly, the current in the middle frequency band of the second current may be conducted to the ground through the fourth capacitor C4 in the second capacitor module. Therefore, the noise reduction efficiency of the filter circuit is further improved.
Fig. 4 is a schematic diagram of an embodiment of a filter circuit according to an embodiment of the present disclosure.
Referring to fig. 4, as shown in fig. 4, in a possible implementation, the first noise reduction device includes a first resistor R1, and the second noise reduction device includes a second resistor R2.
In the embodiment of the present application, when the first current flows through the connection point of the first resistor R1 and the common mode inductor L1, the current in the middle frequency band of the first current flows through the first resistor R1 and then is conducted to the ground through the first capacitor C1. Similarly, when the second current flows through the connection point of the second resistor R2 and the common mode inductor L1, the current in the middle frequency band of the second current flows through the second resistor R2 and then is conducted to the ground through the second capacitor C2.
Fig. 5 is a schematic diagram of an embodiment of a filter circuit according to an embodiment of the present disclosure.
Referring to fig. 5, as shown in fig. 5, in a possible implementation manner, the first noise reduction device includes a first magnetic bead LB1, and the second noise reduction device includes a second magnetic bead LB 2.
In the embodiment of the present application, when the first current flows through the connection point of the first bead LB1 and the common mode inductor L1, the current in the middle sub-band of the first current flows through the first bead LB1 and then is conducted to the ground through the first capacitor C1. Similarly, when the second current flows through the connection point of the second bead LB2 and the common-mode inductor L1, the current in the middle sub-band of the second current flows through the second bead LB2 and then is conducted to the ground through the second capacitor C2.
In the embodiment of the present application, the first noise reduction device a1 includes first magnetic bead LB1, and the second noise reduction device a2 includes second magnetic bead LB2, and when the noise frequency in the electric current was extremely high, the magnetic bead was adopted as the noise reduction device and impedance attenuation under the high frequency noise condition can be prevented, isolated low frequency current that can be effectual to promote filter circuit's reliability.
Fig. 6 is a schematic diagram of an embodiment of a filter circuit according to an embodiment of the present disclosure.
Referring to fig. 6, as shown in fig. 6, in a possible implementation manner, the first noise reducer a1 includes a fifth capacitor C5, and the second noise reducer a2 includes a sixth capacitor C6.
In the embodiment of the present application, when the first current flows through the connection point of the fifth capacitor C5 and the common mode inductor L1, the current in the middle frequency band of the first current flows through the fifth capacitor C5 and then is conducted to the ground through the first capacitor C1. Similarly, when the second current flows through the connection point of the sixth capacitor C6 and the common mode inductor L1, the current in the middle sub-band of the second current flows through the sixth capacitor C6 and then is conducted to the ground through the second capacitor C2.
Fig. 7 is a schematic diagram of an embodiment of a filter circuit according to an embodiment of the present disclosure.
Referring to fig. 7, as shown in fig. 7, in a possible implementation manner, the first noise reducer a1 includes a first resistor R1 and a fifth capacitor C5, and the second noise reducer a2 includes a second resistor and a sixth capacitor C6.
In the embodiment of the present application, the first resistor R1 is connected in series with the fifth capacitor C5. The second resistor R2 is connected in series with the sixth capacitor C6.
In the embodiment of the present application, when the first current flows through the connection point of the fifth capacitor C5 and the common mode inductor L1, or, as shown in fig. 7a, when the first current flows through the connection point of the first resistor R1 and the common mode inductor L1, the current in the middle frequency division section of the first current flows through the fifth capacitor C5 and the first resistor R1, and then is conducted to the ground through the first capacitor C1. Similarly, when the second current flows through the connection point of the sixth capacitor C6 and the common mode inductor L1, or when the second current flows through the connection point of the second resistor R2 and the common mode inductor L1, the current in the middle frequency segment of the second current flows through the sixth capacitor C6 and the second resistor R2, and then is conducted to the ground through the second capacitor C2.
Fig. 8 is a schematic diagram of an embodiment of a filter circuit according to an embodiment of the present disclosure.
Referring to fig. 8, as shown in fig. 8, in a possible implementation manner, the first noise reduction device a1 includes a first resistor R1 and a first magnetic bead LB1, and the second noise reduction device a2 includes a second resistor R2 and a second magnetic bead LB 2.
In the embodiment of the present application, the first resistor R1 is connected in series with the first magnetic bead LB1, and the second resistor R2 is connected in series with the second magnetic bead LB 2.
In the embodiment of the present application, when the first current flows through the connection point of the first resistor R1 and the common mode inductor L1, or, as shown in fig. 8a, when the first current flows through the connection point of the first magnetic bead LB1 and the common mode inductor L1, the current in the middle frequency division section of the first current flows through the first resistor R1 and the first magnetic bead LB1, and then is conducted to the ground through the first capacitor C1. Similarly, when the second current flows through the connection point of the second resistor R2 and the common mode inductor L1, or as shown in fig. 8a, when the second current flows through the connection point of the second magnetic bead LB2 and the common mode inductor L1, the current in the middle frequency division section of the second current flows through the second resistor R2 and the second magnetic bead LB2, and then is conducted to the ground through the second capacitor C2.
Fig. 9 is a schematic diagram of an embodiment of a filter circuit according to an embodiment of the present disclosure.
Referring to fig. 9, as shown in fig. 9, the first noise reduction device includes a first resistor R1 and a first inductor L2, and the second noise reduction device includes a second resistor R2 and a second inductor L3.
In the embodiment of the present application, the first resistor R1 is connected in series with the first inductor L2, and the second resistor R2 is connected in series with the second inductor L3.
In the embodiment of the present application, when the first current flows through the connection point of the first resistor R1 and the common mode inductor L1, or, as shown in fig. 9a, when the first current flows through the connection point of the first inductor L2 and the common mode inductor L1, the current in the middle frequency division section of the first current flows through the first resistor R1 and the first inductor L2, and then is conducted to the ground through the first capacitor C1. Similarly, when the second current flows through the connection point of the second resistor R2 and the common mode inductor L1, or as shown in fig. 9a, when the second current flows through the connection point of the second inductor L3 and the common mode inductor L1, the current in the middle frequency division section of the second current flows through the second resistor R2 and the second inductor L3, and then is conducted to the ground through the second capacitor C2.
Fig. 10 is a schematic diagram of an embodiment of a filter circuit according to an embodiment of the present disclosure.
Referring to fig. 10, as shown in fig. 10, the first noise reduction device includes a first bead LB1 and a fifth capacitor C5, and the second noise reduction device includes a second bead LB2 and a sixth capacitor C6.
In the embodiment of the present application, the first magnetic bead LB1 is connected in series with the fifth capacitor C5, and the second magnetic bead LB2 is connected in series with the sixth capacitor C6.
In the embodiment of the present application, when the first current flows through the connection point of the first bead LB1 and the common mode inductor L1, or, as shown in fig. 10a, when the first current flows through the connection point of the fifth capacitor C5 and the common mode inductor L1, the current in the middle frequency division section of the first current flows through the first bead LB1 and the fifth capacitor C5, and then is conducted to the ground through the first capacitor C1. Similarly, when the second current flows through the connection point of the second bead LB2 and the common mode inductor L1, or as shown in fig. 10a, when the second current flows through the connection point of the sixth capacitor C6 and the common mode inductor L1, the current in the middle sub-band of the second current flows through the second bead LB2 and the sixth capacitor C6, and then is conducted to the ground through the second capacitor C2.
Fig. 11 is a schematic diagram of an embodiment of a filter circuit according to an embodiment of the present disclosure.
Referring to fig. 11, as shown in fig. 11, the first noise reducer a1 includes a first bead LB1 and a first inductor L2, and the second noise reducer a2 includes a second bead LB2 and a second inductor L3.
In the embodiment of the present application, the first magnetic bead LB1 is connected in series with the first inductor L2, and the second magnetic bead LB2 is connected in series with the second inductor L3.
In the embodiment of the present application, when the first current flows through the connection point of the first bead LB1 and the common mode inductor L1, or, as shown in fig. 11a, when the first current flows through the connection point of the first inductor L2 and the common mode inductor L1, the current in the middle frequency division section of the first current flows through the first bead LB1 and the first inductor L2, and then is conducted to the ground through the first capacitor C1. Similarly, when the second current flows through the connection point of the second bead LB2 and the common mode inductor L1, or as shown in fig. 11a, when the second current flows through the connection point of the second inductor L3 and the common mode inductor L1, the current in the middle frequency division section of the second current flows through the second bead LB2 and the second inductor L3, and then is conducted to the ground through the second capacitor C2.
Fig. 12 is a schematic diagram of an embodiment of a filter circuit according to an embodiment of the present disclosure.
Referring to fig. 12, as shown in fig. 12, the first noise reduction device a1 includes a fifth capacitor C5 and a first inductor L2, and the second noise reduction device a2 includes a sixth capacitor C6 and a second inductor L3.
In the embodiment of the present application, the fifth capacitor C5 is connected in series with the first inductor L2, and the sixth capacitor C2 is connected in series with the second inductor L3.
In the embodiment of the present application, when the first current flows through the connection point of the fifth capacitor C5 and the common mode inductor L1, or, as shown in fig. 12a, when the first current flows through the connection point of the first inductor L2 and the common mode inductor L1, the current in the middle frequency division section of the first current flows through the fifth capacitor C5 and the first inductor L2, and then is conducted to the ground through the first capacitor C1. Similarly, when the second current flows through the connection point of the sixth capacitor C6 and the common mode inductor L1, or as shown in fig. 12a, when the second current flows through the connection point of the second inductor L3 and the common mode inductor L1, the current in the middle frequency division section of the second current flows through the sixth capacitor C6 and the second inductor L3, and then is conducted to the ground through the second capacitor C2.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and various other media capable of storing program codes.
Claims (12)
1. A filter circuit, comprising: the noise reduction circuit comprises a first capacitor module and an inductor module, wherein the first capacitor module comprises a first capacitor and a second capacitor, and the inductor module comprises a common-mode inductor, a first noise reduction device and a second noise reduction device;
the first capacitor is connected with the second capacitor in series;
the first end of the first capacitor is connected with the first end of the first noise reduction device and the first end of the common-mode inductor;
the first end of the second capacitor is connected with the first end of the second noise reduction device and the second end of the common-mode inductor;
the second end of the first noise reduction device is connected with the third end of the common-mode inductor;
the second end of the second noise reduction device is connected with the fourth end of the common-mode inductor;
the second end of the first capacitor is connected with the second end of the second capacitor, and the second end of the first capacitor and the second end of the second capacitor are grounded;
when a first current flows through the first noise reduction device and a connection point of the common mode inductor, the current of a first current middle frequency band flows through the first noise reduction device and then is led into the ground through the first capacitor;
when a second current flows through the second noise reduction device and the connection point of the common mode inductor, the current of the middle frequency band of the second current flows through the second noise reduction device and then is conducted into the ground through the second capacitor.
2. The filter circuit of claim 1, further comprising a second capacitance module comprising a third capacitance and a fourth capacitance;
the third capacitor is connected with the fourth capacitor in series;
the first end of the third capacitor is connected with the second end of the first noise reduction device and the third end of the common-mode inductor;
a first end of the fourth capacitor is connected with a second end of the second noise reduction device and a fourth end of the common mode inductor;
and the second end of the third capacitor is connected with the second end of the fourth capacitor, and the second ends of the third capacitor and the fourth capacitor are grounded.
3. The filter circuit according to claim 1 or 2, wherein the first noise reducing means comprises a first resistor and the second noise reducing means comprises a second resistor;
when a first current flows through the first resistor and the connection point of the common mode inductor, the current of the middle frequency band of the first current flows through the first resistor and then is led into the ground through the first capacitor;
when a second current flows through the second resistor and the connection point of the common mode inductor, the current of the middle frequency band of the second current flows through the second resistor and then is conducted into the ground through the second capacitor.
4. The filter circuit of claim 1 or 2, wherein the first noise reduction means comprises a first bead and the second noise reduction means comprises a second bead;
when a first current flows through a connection point of the first magnetic bead and the common-mode inductor, the current of a middle frequency division band of the first current flows through the first magnetic bead and then is led into the ground through the first capacitor;
when a second current flows through the second magnetic bead and the connection point of the common mode inductor, the current of the middle frequency band of the second current flows through the second magnetic bead and then is conducted to the ground through the second capacitor.
5. The filter circuit according to claim 1 or 2, wherein the first noise reducing means comprises a fifth capacitor and the second noise reducing means comprises a sixth capacitor;
when a first current flows through the fifth capacitor and the connection point of the common mode inductor, the current of the middle frequency band of the first current flows through the fifth capacitor and then is led into the ground through the first capacitor;
when a second current flows through the connection point of the sixth capacitor and the common mode inductor, the current of the middle frequency band of the second current flows through the sixth capacitor and then is conducted to the ground through the second capacitor.
6. The filter circuit according to claim 1 or 2, wherein the first noise reduction means comprises a first resistor and a fifth capacitor, and the second noise reduction means comprises a second resistor and a sixth capacitor;
the first resistor is connected with the fifth capacitor in series;
the second resistor is connected with the sixth capacitor in series;
when a first current flows through a connection point of the fifth capacitor and the common mode inductor, or when the first current flows through a connection point of the first resistor and the common mode inductor, the current of a middle frequency band of the first current flows through the fifth capacitor and the first resistor, and then is led into the ground through the first capacitor;
when a second current flows through the connection point of the sixth capacitor and the common mode inductor, or when the second current flows through the connection point of the second resistor and the common mode inductor, the current of the middle frequency band of the second current flows through the sixth capacitor and the second resistor, and then is conducted to the ground through the second capacitor.
7. The filter circuit of claim 1 or 2, wherein the first noise reduction device comprises a first resistor and a first magnetic bead, and the second noise reduction device comprises a second resistor and a second magnetic bead;
the first resistor is connected with the first magnetic bead in series;
the second resistor is connected with the second magnetic beads in series;
when a first current flows through the connection point of the first resistor and the common-mode inductor, or when the first current flows through the connection point of the first magnetic bead and the common-mode inductor, the current of a middle frequency band of the first current flows through the first resistor and the first magnetic bead and then is conducted to the ground through the first capacitor;
when a second current flows through the connection point of the second resistor and the common-mode inductor, or when the second current flows through the connection point of the second magnetic bead and the common-mode inductor, the current of a middle frequency band of the second current flows through the second resistor and the second magnetic bead and then is conducted to the ground through the second capacitor.
8. The filter circuit according to claim 1 or 2, wherein the first noise reducing means comprises a first resistor and a first inductor, and the second noise reducing means comprises a second resistor and a second inductor;
the first resistor is connected with the first inductor in series;
the second resistor is connected with the second inductor in series;
when a first current flows through the connection point of the first resistor and the common mode inductor, or when the first current flows through the connection point of the first inductor and the common mode inductor, the current of a middle frequency band of the first current flows through the first resistor and the first inductor and then is led into the ground through the first capacitor;
when a second current flows through the connection point of the second resistor and the common mode inductor, or when the second current flows through the connection point of the second inductor and the common mode inductor, the current of the middle frequency band of the second current flows through the second resistor and the second inductor, and then is conducted to the ground through the second capacitor.
9. The filter circuit according to claim 1 or 2, wherein the first noise reduction device comprises a first magnetic bead and a fifth capacitor, and the second noise reduction device comprises a second magnetic bead and a sixth capacitor;
the first magnetic bead is connected with the fifth capacitor in series;
the second magnetic bead is connected with the sixth capacitor in series;
when a first current flows through a connection point of the first magnetic bead and the common-mode inductor, or when the first current flows through a connection point of the fifth capacitor and the common-mode inductor, the current of a middle frequency division band of the first current flows through the first magnetic bead and the fifth capacitor and then is led into the ground through the first capacitor;
when a second current flows through the connection point of the second magnetic bead and the common-mode inductor, or when the second current flows through the connection point of the sixth capacitor and the common-mode inductor, the current of the middle frequency band of the second current flows through the second magnetic bead and the sixth capacitor, and then is conducted to the ground through the second capacitor.
10. The filter circuit of claim 1 or 2, wherein the first noise reduction device comprises a first magnetic bead and a first inductor, and the second noise reduction device comprises a second magnetic bead and a second inductor;
the first magnetic bead is connected with the first inductor in series;
the second magnetic bead is connected with the second inductor in series;
when a first current flows through a connection point of the first magnetic bead and the common-mode inductor, or when the first current flows through a connection point of the first inductor and the common-mode inductor, the current of a middle frequency band of the first current flows through the first magnetic bead and the first inductor, and then is conducted to the ground through the first capacitor;
when a second current flows through the connection point of the second magnetic bead and the common-mode inductor, or when the second current flows through the connection point of the second inductor and the common-mode inductor, the current of a middle frequency band of the second current flows through the second magnetic bead and the second inductor, and then is conducted to the ground through the second capacitor.
11. The filter circuit according to claim 1 or 2, wherein the first noise reduction device comprises a fifth capacitor and a first inductor, and the second noise reduction device comprises a sixth capacitor and a second inductor;
the fifth capacitor is connected with the first inductor in series;
the sixth capacitor is connected with the second inductor in series;
when a first current flows through a connection point of the fifth capacitor and the common mode inductor, or when the first current flows through a connection point of the first inductor and the common mode inductor, the current of a middle frequency band of the first current flows through the fifth capacitor and the first inductor, and then is led into the ground through the first capacitor;
when a second current flows through a connection point of the sixth capacitor and the common mode inductor, or when the second current flows through a connection point of the second inductor and the common mode inductor, the current of a middle frequency band of the second current flows through the sixth capacitor and the second inductor, and then is conducted to the ground through the second capacitor.
12. An in-vehicle electronic component characterized by comprising: a first functional module, a filter circuit and a power module, the filter circuit being as claimed in any one of claims 1 to 11.
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| CN202010476782.1A CN111726100A (en) | 2020-05-29 | 2020-05-29 | Filter circuit and vehicle-mounted electronic equipment |
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| CN202010476782.1A CN111726100A (en) | 2020-05-29 | 2020-05-29 | Filter circuit and vehicle-mounted electronic equipment |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10215135A (en) * | 1997-01-29 | 1998-08-11 | Matsushita Electric Ind Co Ltd | Terminal noise filter for inverter power using unit |
| JPH11122909A (en) * | 1997-10-16 | 1999-04-30 | Fuji Electric Co Ltd | Noise filter for power converter |
| CN101202150A (en) * | 2006-12-13 | 2008-06-18 | 艾默生网络能源系统有限公司 | EMC filter inductance |
| CN105099165A (en) * | 2014-05-19 | 2015-11-25 | 北京东土科技股份有限公司 | EMC protection and filtering device and method of high voltage power supply |
| JP2015220476A (en) * | 2014-05-14 | 2015-12-07 | 株式会社村田製作所 | Common mode noise filter |
| US20170309395A1 (en) * | 2014-12-03 | 2017-10-26 | Mitsubishi Electric Corporation | Dual-mode choke coil and high-frequency filter using same, and on-board motor integrated electric power steering and on-board charging device |
| KR20190080613A (en) * | 2017-12-28 | 2019-07-08 | 엘지전자 주식회사 | Noise filter |
| JP2020048047A (en) * | 2018-09-19 | 2020-03-26 | パナソニックＩｐマネジメント株式会社 | Common mode noise filter |
-
2020
- 2020-05-29 CN CN202010476782.1A patent/CN111726100A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10215135A (en) * | 1997-01-29 | 1998-08-11 | Matsushita Electric Ind Co Ltd | Terminal noise filter for inverter power using unit |
| JPH11122909A (en) * | 1997-10-16 | 1999-04-30 | Fuji Electric Co Ltd | Noise filter for power converter |
| CN101202150A (en) * | 2006-12-13 | 2008-06-18 | 艾默生网络能源系统有限公司 | EMC filter inductance |
| JP2015220476A (en) * | 2014-05-14 | 2015-12-07 | 株式会社村田製作所 | Common mode noise filter |
| CN105099165A (en) * | 2014-05-19 | 2015-11-25 | 北京东土科技股份有限公司 | EMC protection and filtering device and method of high voltage power supply |
| US20170309395A1 (en) * | 2014-12-03 | 2017-10-26 | Mitsubishi Electric Corporation | Dual-mode choke coil and high-frequency filter using same, and on-board motor integrated electric power steering and on-board charging device |
| KR20190080613A (en) * | 2017-12-28 | 2019-07-08 | 엘지전자 주식회사 | Noise filter |
| JP2020048047A (en) * | 2018-09-19 | 2020-03-26 | パナソニックＩｐマネジメント株式会社 | Common mode noise filter |
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