CN212034095U - Wide-band filter element and circuit - Google Patents
Wide-band filter element and circuit Download PDFInfo
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- CN212034095U CN212034095U CN202020759679.3U CN202020759679U CN212034095U CN 212034095 U CN212034095 U CN 212034095U CN 202020759679 U CN202020759679 U CN 202020759679U CN 212034095 U CN212034095 U CN 212034095U
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- capacitor
- voltage limiting
- filter element
- limiting element
- broadband filter
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Abstract
The utility model relates to an electronic components, the utility model discloses aim at solving current wide band filter circuit's structure and the complicated problem of assembly process, provide a wide band filter element and circuit, wide band filter element includes: the broadband filter comprises a voltage limiting element, a first capacitor and a second capacitor, wherein the first capacitor is a low-frequency capacitor, the second capacitor is a high-frequency capacitor, one end of the voltage limiting element is connected with one end of the first capacitor and one end of the second capacitor respectively, the other end of the voltage limiting element is connected with the other end of the first capacitor and the other end of the second capacitor respectively, the voltage limiting element, the first capacitor and the second capacitor are packaged into an integral structure to form a broadband filter element, one end of the voltage limiting element is a first port of the broadband filter element, and the other end of the voltage limiting element is a second port of the broadband filter element. The utility model discloses can effectively restrain the interfering signal of different frequency channels to it is small, assembly process is simple, is applicable to direct current motor.
Description
Technical Field
The utility model relates to an electronic components relates to a wide band filtering component and circuit particularly.
Background
Along with the electrification and intellectualization of the automobile, the direct current motor is increasingly used on the automobile, and meanwhile, along with the increase of the use of electronic appliances and the application of a 5G technology, the requirement of the whole automobile on the electromagnetic disturbance (EMC) of the direct current motor is increasingly high, and the requirement on the range of a frequency band is also increasingly wide.
In order to suppress the surge interference signal and the surge low-frequency interference signal at the same time, a low-pass filter circuit for suppressing the surge high-frequency interference signal and a high-pass filter circuit for suppressing the surge low-frequency interference signal are provided to constitute a wide-band filter circuit.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving current wide band filter circuit's structure and the complicated problem of assembly process, provide a wide band filter element and circuit.
The utility model provides a technical scheme that above-mentioned technical problem adopted is: a broadband filtering element comprising: the broadband filter comprises a voltage limiting element, a first capacitor and a second capacitor, wherein the first capacitor is a low-frequency capacitor, the second capacitor is a high-frequency capacitor, one end of the voltage limiting element is connected with one end of the first capacitor and one end of the second capacitor respectively, the other end of the voltage limiting element is connected with the other end of the first capacitor and the other end of the second capacitor respectively, the voltage limiting element, the first capacitor and the second capacitor are packaged into an integral structure to form a broadband filter element, one end of the voltage limiting element is a first port of the broadband filter element, and the other end of the voltage limiting element is a second port of the broadband filter element.
Further, the first capacitance is an X7R capacitance.
Further, the second capacitor is an NPO capacitor.
Further, the voltage limiting element is a piezoresistor.
Further, the voltage limiting element is a TVS diode.
The utility model discloses still provide a wide band filter circuit, be applied to DC motor, DC motor includes two power supply anodals, power supply's anodal and one of them anodal connection of DC motor, including two above-mentioned wide band filter component, DC motor's an anodal is through a wide band filter component ground connection, and another anodal of DC motor is through another wide band filter component ground connection.
Further, the method also comprises the following steps: the direct current motor comprises a first inductor and a second inductor, wherein the first inductor is connected with one positive pole of the direct current motor in series, and the second inductor is connected with the other positive pole of the direct current motor in series.
The utility model has the advantages that: broadband filter element, through will have the low frequency electric capacity of better inhibitory action to low frequency interference signal, have the high frequency electric capacity of better inhibitory action to high frequency signal and the voltage limiting component who has the clamp function encapsulates into a body structure and forms broadband filter element, can effectively restrain the interfering signal of different frequency channels to this broadband filter element's volume is less, only has two pins after the encapsulation, reducible electronic components's assembly process reduces the technology cost.
Drawings
Fig. 1 is a schematic structural diagram of a broadband filter element according to an embodiment of the present invention;
fig. 2 is another schematic structural diagram of a broadband filter element according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a filtering principle of the broadband filter circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a broadband filter circuit according to an embodiment of the present invention;
description of reference numerals:
c1 — first capacitance; c2 — second capacitance; RV-piezoresistor; TVS-TVS diode.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Broadband filtering component, include: the broadband filter comprises a voltage limiting element, a first capacitor and a second capacitor, wherein the first capacitor is a low-frequency capacitor, the second capacitor is a high-frequency capacitor, one end of the voltage limiting element is connected with one end of the first capacitor and one end of the second capacitor respectively, the other end of the voltage limiting element is connected with the other end of the first capacitor and the other end of the second capacitor respectively, the voltage limiting element, the first capacitor and the second capacitor are packaged into an integral structure to form a broadband filter element, one end of the voltage limiting element is a first port of the broadband filter element, and the other end of the voltage limiting element is a second port of the broadband filter element.
Broadband filter element integrated low frequency electric capacity at the lower impedance performance of low frequency section, high frequency electric capacity is at the lower impedance performance of high frequency section, through parallelly connected low frequency electric capacity and high frequency electric capacity to the realization is to wide frequency section interfering signal's suppression, clamps the impulse voltage that reverse electromotive force produced through the voltage limiting element, in addition, encapsulates into a body structure with each component, only remains two pins, and the volume is littleer, and it is more convenient to use.
Examples
The embodiment of the utility model provides a wide band filtering component, as shown in FIG. 1, include: the broadband filter comprises a voltage limiting element, a first capacitor and a second capacitor, wherein the first capacitor is a low-frequency capacitor, the second capacitor is a high-frequency capacitor, one end of the voltage limiting element is connected with one end of the first capacitor and one end of the second capacitor respectively, the other end of the voltage limiting element is connected with the other end of the first capacitor and the other end of the second capacitor respectively, the voltage limiting element, the first capacitor and the second capacitor are packaged into an integral structure to form a broadband filter element, one end of the voltage limiting element is a first port of the broadband filter element, and the other end of the voltage limiting element is a second port of the broadband filter element.
The voltage limiting element is used for clamping an impulse voltage generated by a reverse electromotive force, as shown in fig. 1, the voltage limiting element can be a piezoresistor, and by utilizing the nonlinear characteristic of the piezoresistor, when an overvoltage appears between two poles of the piezoresistor, the piezoresistor can clamp the voltage to a relatively fixed voltage value, so that the protection of a rear-stage circuit is realized.
As shown in fig. 2, the voltage limiting element may also be a TVS (transient voltage suppression) diode, which suppresses an excessive voltage exceeding the breakdown voltage, and when the overvoltage disappears, the TVS diode automatically resets, and the response speed of the overvoltage of the TVS diode is faster.
The first capacitor can be an X7R capacitor, the second capacitor can be an NPO capacitor, as shown in FIG. 3, the X7R capacitor has a good suppression effect on low-frequency interference signals, the NPO capacitor has a good suppression effect on high-frequency interference signals, the two capacitors are connected in parallel to form a broadband filter element which has a good suppression effect on both the low-frequency interference signals and the high-frequency interference signals, and the broadband filter element has a good suppression effect on disturbance source frequency in a range of 100 KHz-5 GHz.
The utility model discloses still provide a wide band filter circuit, as shown in FIG. 4, be applied to DC motor, institute DC motor includes two power supply anodals, power supply's anodal and one of them anodal of DC motor are connected, including two above-mentioned wide band filter component, DC motor's an anodal is through a wide band filter component ground connection, and DC motor's another anodal is through another wide band filter component ground connection.
It can be understood that one positive pole of the direct current motor is a high-speed gear, the other positive pole of the direct current motor is a low-speed gear, and the two positive poles of the direct current motor are respectively provided with the broadband filtering elements, so that the power supply of the direct current motor which is connected with power supply in two modes is subjected to broadband filtering, and a power supply loop is protected from being damaged.
In addition, the wideband filter circuit described in this embodiment may further include: the direct current motor comprises a first inductor and a second inductor, wherein the first inductor is connected with one positive pole of the direct current motor in series, and the second inductor is connected with the other positive pole of the direct current motor in series. The inductors are respectively connected in series with the two positive electrodes of the direct current motor, so that alternating current signals of the power supply source of the direct current motor which is connected with power supply in two modes are isolated, and the anti-electromagnetic interference capability of the circuit can be further improved.
Claims (7)
1. A wideband filter element, comprising: the broadband filter comprises a voltage limiting element, a first capacitor and a second capacitor, wherein the first capacitor is a low-frequency capacitor, the second capacitor is a high-frequency capacitor, one end of the voltage limiting element is connected with one end of the first capacitor and one end of the second capacitor respectively, the other end of the voltage limiting element is connected with the other end of the first capacitor and the other end of the second capacitor respectively, the voltage limiting element, the first capacitor and the second capacitor are packaged into an integral structure to form a broadband filter element, one end of the voltage limiting element is a first port of the broadband filter element, and the other end of the voltage limiting element is a second port of the broadband filter element.
2. The broadband filter element of claim 1 wherein said first capacitor is an X7R capacitor.
3. The broadband filter element of claim 1 wherein said second capacitor is an NPO capacitor.
4. The wideband filter element of claim 1 wherein said voltage limiting element is a varistor.
5. The wideband filter element of claim 1 wherein said voltage limiting element is a TVS diode.
6. A broadband filter circuit applied to a direct current motor, wherein the direct current motor comprises two power supply anodes, the anode of a power supply used for supplying power to the direct current motor is connected with one anode of the direct current motor, the broadband filter circuit is characterized by comprising two broadband filter elements according to any one of claims 1 to 5, one anode of the direct current motor is grounded through one broadband filter element, and the other anode of the direct current motor is grounded through the other broadband filter element.
7. The wideband filter circuit of claim 6, further comprising: the direct current motor comprises a first inductor and a second inductor, wherein the first inductor is connected with one positive pole of the direct current motor in series, and the second inductor is connected with the other positive pole of the direct current motor in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020759679.3U CN212034095U (en) | 2020-05-09 | 2020-05-09 | Wide-band filter element and circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020759679.3U CN212034095U (en) | 2020-05-09 | 2020-05-09 | Wide-band filter element and circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212034095U true CN212034095U (en) | 2020-11-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020759679.3U Active CN212034095U (en) | 2020-05-09 | 2020-05-09 | Wide-band filter element and circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212034095U (en) |
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2020
- 2020-05-09 CN CN202020759679.3U patent/CN212034095U/en active Active
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