WO2021120275A1 - 滤波电路及电子设备 - Google Patents

滤波电路及电子设备 Download PDF

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Publication number
WO2021120275A1
WO2021120275A1 PCT/CN2019/128700 CN2019128700W WO2021120275A1 WO 2021120275 A1 WO2021120275 A1 WO 2021120275A1 CN 2019128700 W CN2019128700 W CN 2019128700W WO 2021120275 A1 WO2021120275 A1 WO 2021120275A1
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WO
WIPO (PCT)
Prior art keywords
node
capacitor
magnetic bead
integrated circuit
control module
Prior art date
Application number
PCT/CN2019/128700
Other languages
English (en)
French (fr)
Inventor
肖剑锋
Original Assignee
Tcl华星光电技术有限公司
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tcl华星光电技术有限公司 filed Critical Tcl华星光电技术有限公司
Priority to US16/627,368 priority Critical patent/US20210367575A1/en
Publication of WO2021120275A1 publication Critical patent/WO2021120275A1/zh

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H5/00—One-port networks comprising only passive electrical elements as network components
    • H03H5/12—One-port networks comprising only passive electrical elements as network components with at least one voltage- or current-dependent element
    • 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
    • H03H7/0115—Frequency selective two-port networks comprising only inductors and capacitors
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H1/00—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network
    • H03H1/0007—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network of radio frequency interference filters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H1/00—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network
    • H03H2001/0021—Constructional details
    • H03H2001/005—Wound, ring or feed-through type inductor
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H1/00—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network
    • H03H2001/0021—Constructional details
    • H03H2001/0057—Constructional details comprising magnetic material

Definitions

  • This application relates to the field of display technology, and in particular to a filter circuit and electronic equipment.
  • the ripple phenomenon is an inevitable phenomenon caused by the voltage fluctuation of the DC stabilized power supply.
  • the driving circuit of the prior art uses a filter circuit to suppress the ripple phenomenon.
  • the filter circuit is generally placed between the output terminal of the power module and the power input pin of the IC (Integrate Circuit, integrated circuit).
  • the prior art filter circuit generally uses capacitors and inductors. The capacitors and inductors are repeatedly charged and discharged to form a resonance phenomenon, which leads to an increase in the ripple at the output of the filter circuit.
  • the ripples in the peak part form noise and cause electromagnetic interference (Electromagnetic Interference). Interference, EMI), affecting the normal and stable operation of the IC.
  • EMI electromagnetic interference
  • the embodiment of the present application provides a filter circuit, which can solve the technical problem that the filter circuit of the prior art is prone to generate electromagnetic interference and affects the normal and stable operation of the integrated circuit.
  • the application provides a filter circuit connected between a power output module and an integrated circuit control module.
  • the filter circuit includes a capacitor unit, a magnetic bead component and a filter capacitor.
  • the capacitor unit is connected to the first node of the power output module.
  • the magnetic bead assembly is connected between the second node of the integrated circuit control module and the first node of the power output module.
  • the filter capacitor is connected to the second node of the integrated circuit control module, and the resistance of the magnetic bead assembly is 0 ohm.
  • the capacitor unit includes at least two first capacitors and second capacitors connected in parallel, and the first capacitor and the second capacitor have different capacitance values.
  • the first capacitor is a tantalum capacitor.
  • the second capacitor is a ceramic dielectric capacitor.
  • the material of the magnetic bead assembly is iron-magnesium, iron-nickel alloy or ferrite.
  • This application also provides an electronic device, including a power output module, an integrated circuit control module, a capacitor unit, a magnetic bead component, and a filter capacitor.
  • the first node of the power output module is used to output a power signal.
  • the second node of the integrated circuit control module is used to input the power signal.
  • the capacitor unit is connected to the first node of the power output module.
  • the magnetic bead assembly is connected between the second node of the integrated circuit control module and the first node of the power output module.
  • the filter capacitor is connected to the second node of the integrated circuit control module, wherein the resistance of the magnetic bead assembly is 0 ohm.
  • This application also provides an electronic device, including a power output module, an integrated circuit control module, a capacitor unit, a magnetic bead component, and a filter capacitor.
  • the first node of the power output module is used to output a power signal.
  • the second node of the integrated circuit control module is used to input the power signal.
  • the capacitor unit is connected to the first node of the power output module.
  • the magnetic bead assembly is connected between the second node of the integrated circuit control module and the first node of the power output module, wherein no capacitor is provided between the magnetic bead assembly and the integrated circuit control module .
  • the first capacitor is a tantalum capacitor.
  • the second capacitor is a ceramic dielectric capacitor.
  • the material of the magnetic bead assembly is iron-magnesium, iron-nickel alloy or ferrite.
  • the beneficial effect of the present application is that the filter circuit provided in the present application sets the resistance of the magnetic bead assembly to 0 ohm, so that the power signal output by the power output module passes through the magnetic bead assembly, and the power supply The ripple of the signal is reduced.
  • the electronic device of the present application does not provide a capacitor between the magnetic bead assembly and the integrated circuit control module, so the formation of series resonance can be avoided, and the phenomenon of electromagnetic interference in the prior art can be solved, which affects the normal and stable operation of the IC.
  • FIG. 1 is a schematic diagram of the structure of an electronic device according to an embodiment of the application.
  • FIG. 2 is a schematic structural diagram of an electronic device according to another embodiment of the application.
  • FIG. 3 is a schematic structural diagram of a magnetic bead assembly provided by an embodiment of the application.
  • FIG. 4 is a schematic structural diagram of an electronic device according to another embodiment of the application.
  • 5a and 5b respectively show the waveform diagrams of the output terminal of the power module and the power input pin of the IC before and after passing through the traditional filter circuit.
  • first and second are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with “first” and “second” may explicitly or implicitly include one or more of the features. In the description of the present invention, “plurality” means two or more than two, unless otherwise specifically defined.
  • FIG. 1 is a schematic structural diagram of an electronic device 100 according to an embodiment of the application.
  • the electronic device 100 includes a power output module 20, an integrated circuit control module 30 and a filter circuit 1.
  • the filter circuit 1 is electrically connected between the first node N1 of the power output module 20 and the second node N2 of the integrated circuit control module 30.
  • the first node N1 of the power output module 20 is used to output a power signal.
  • the second node N2 of the integrated circuit control module 30 is used to input the power signal.
  • the power output module 20 is used to provide current to the integrated circuit control module 30. Because in the process of current transmission, in order to filter the AC signal of the current, a filter circuit 1 needs to be provided between the power output module 20 and the integrated circuit control module 30.
  • the filter circuit 1 is used to reduce the ripple of the power signal or reduce EMI.
  • the filter circuit 1 includes a capacitor unit C, a filter capacitor C3, and a magnetic bead component W1.
  • the magnetic bead component W1 can be a ferrite bead filter, which can be equivalent to a resistance component R and an inductance component L.
  • the magnetic bead assembly W1 may be a ferrite bead filter, and its material is iron-magnesium, iron-nickel alloy or ferrite.
  • the magnetic bead component W1 has high resistivity and permeability, which is equivalent to the series connection of resistance and inductance, but the resistance value and inductance value change with frequency, and it has better high-frequency filtering characteristics than ordinary inductors. It is resistive at the time, so it can maintain a high impedance in a relatively wide frequency range, thereby improving the FM filtering effect.
  • the function of the magnetic bead assembly W1 is mainly to eliminate radio frequency (RF) noise existing in the transmission line between the power output module 20 and the integrated circuit control module 30, wherein the energy of the RF noise It is the AC sine wave component superimposed on the DC transmission level.
  • the magnetic bead assembly W1 is used to eliminate these unnecessary signal energy.
  • a chip magnetic bead assembly can be selected in the embodiment of the present application to eliminate high-frequency noise signals.
  • the resistance of the magnetic bead component W1 is set to 0 ohm, so that after the power signal output by the power output module 20 passes through the magnetic bead component W1, the ripple of the power signal input to the integrated circuit control module 30 is reduced.
  • the capacitor unit C may include, but is not limited to, two first capacitors C1 and a second resistor C2 connected in parallel, and the first capacitor C1 and the second resistor C2 have different capacitance values.
  • the first capacitor C1 of the capacitor unit C may be a tantalum capacitor greater than or equal to 20 ⁇ F for filtering AC signals less than or equal to 200 kHz.
  • the second capacitor C2 may be a ceramic dielectric capacitor less than or equal to 0.1 ⁇ F, which is used to filter AC signals with a frequency greater than or equal to 1 MHz. Because the larger the capacitance, the smaller the corresponding impedance, and the better the corresponding filtering performance. For noise signals above 1 MHz, a ceramic dielectric capacitor with a small capacitance value is used to filter out, to ensure that the operating frequency of the capacitor unit C is far lower than its own resonance frequency.
  • the electronic device 200 includes a power output module 20, an integrated circuit control module 30, and a filter circuit 1.
  • the filter circuit 1 is electrically connected between the first node N1 of the power output module 20 and the second node N2 of the integrated circuit control module 30.
  • the first node N1 of the power output module 20 is used to output a power signal.
  • the second node N2 of the integrated circuit control module 30 is used to input the power signal.
  • the power output module 20 is used to provide current to the integrated circuit control module 30. Because in the process of current transmission, in order to filter the AC signal of the current, a filter circuit 1 needs to be provided between the power output module 20 and the integrated circuit control module 30.
  • the filter circuit 1 is used to reduce the ripple of the power signal or reduce EMI.
  • the filter circuit 1 includes a capacitor unit C and a magnetic bead component W1.
  • the magnetic bead component W1 can be a ferrite bead filter, which can be equivalent to a resistance component R and an inductance component L.
  • the magnetic bead component W1 may be a ferrite bead filter, and its material is iron-magnesium, iron-nickel alloy or ferrite.
  • the magnetic bead component W1 has high resistivity and permeability, which is equivalent to the series connection of resistance and inductance, but the resistance value and inductance value change with frequency, and it has better high-frequency filtering characteristics than ordinary inductors.
  • the function of the magnetic bead assembly W1 is mainly to eliminate radio frequency (RF) noise existing in the transmission line between the power output module 20 and the integrated circuit control module 30, wherein the energy of the RF noise It is the AC sine wave component superimposed on the DC transmission level.
  • the magnetic bead assembly W1 is used to eliminate these unwanted signal energy.
  • a chip magnetic bead assembly can be selected in the embodiment of the present application to eliminate high-frequency noise signals.
  • the electronic device 200 of this embodiment does not provide a capacitor between the magnetic bead assembly W1 and the integrated circuit control module 30.
  • the electronic device 200 of this embodiment will not increase the ripple of the power signal entering the integrated circuit control module 30, and will not affect the stable operation of the integrated circuit control module 30.
  • FIG. 3 is a schematic structural diagram of a magnetic bead assembly provided by an embodiment of the application.
  • the resistance assembly R includes a plurality of parallel sub-resistors R1, and the resistance of the sub-resistors R1 is lower than The range is 0-10 ohms.
  • a plurality of parallel sub-resistors R1 are set here to make the magnetic bead assembly have a higher resistivity and improve the high-frequency noise elimination of the magnetic bead assembly Effect.
  • the inductance component L is made of an outer enamel coil, and the inductance of the inductance component L is in the range of 0.1-2200 microhenries.
  • the filter circuit 1 further includes a current limiting component 40, which is disposed on the magnetic bead component W1 and the integrated circuit control module 30 In between, it is used to limit the voltage value of the second node N2, so that the voltage value to the ground of the second node N2 is not less than 4V.
  • the current-limiting component 40 may be a current-limiting resistor, thereby reducing the current at the first node N1 of the filter circuit. For example, adding a current-limiting resistor to one end of the magnetic bead component W1 can reduce the current flowing and prevent damage. Magnetic bead assembly W1.
  • the electronic devices 100, 200, and 300 can be any products or components that use filtering functions, such as mobile phones, tablet computers, televisions, monitors, notebook computers, digital photo frames, and navigators.
  • the filter circuit provided by the present application sets the resistance of the magnetic bead assembly to 0 ohm, so that after the power signal output by the power output module passes through the magnetic bead assembly, the ripple of the power signal is reduced .
  • the electronic device of the present application does not provide a capacitor between the magnetic bead assembly and the integrated circuit control module, so the formation of series resonance phenomenon can be avoided, thereby solving the problem that the first node of the prior art is prone to electromagnetic interference and affects the IC.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Filters And Equalizers (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

本申请涉及一种滤波电路和电子设备，所述滤波电路连接于电源输出模块和集成电路控制模块之间。所述滤波电路包括电容单元、磁珠组件和滤波电容。所述电容单元连接所述电源输出模块的第一节点。所述磁珠组件连接于所述集成电路控制模块的第二节点和所述电源输出模块的所述第一节点之间。所述滤波电容连接于所述集成电路控制模块的第二节点，其中所述磁珠组件的电阻为0奥姆。所述电源输出模块输出的电源信号在通过所述磁珠组件后，所述电源信号的波纹减少，进而解决现有技术易产生电磁干扰现象、影响IC正常稳定工作的技术问题。

Description

滤波电路及电子设备 技术领域
本申请涉及显示技术领域，尤其涉及一种滤波电路及电子设备。
 背景技术
纹波现象是由于直流稳定电源的电压波动而造成的一种不可避免的现象，现有技术的驱动电路使用滤波电路以抑制纹波现象。
图5a和图5b分别绘示电源模块输出端与IC的电源输入引脚在通过传统滤波电路前后的波形图。现有技术的驱动电路中，滤波电路一般置于在电源模块输出端与IC（Integrate Circuit，集成电路）的电源输入引脚之间。然而，现有技术的滤波电路一般采用电容与电感，电容和电感部分反复充放电形成谐振现象，导致滤波电路的输出端的纹波增加，其中尖峰部分的纹波形成噪声，造成电磁干扰现象（Electromagnetic Interference，EMI），影响IC的正常稳定工作。
 技术问题
本申请实施例提供一种滤波电路，可解决现有技术的滤波电路易产生电磁干扰现象、并影响集成电路的正常稳定工作的技术问题。
 技术解决方案
本申请提供一种滤波电路，连接于一电源输出模块和一集成电路控制模块之间。所述滤波电路包括电容单元、磁珠组件和滤波电容。所述电容单元连接所述电源输出模块的第一节点。所述磁珠组件连接于所述集成电路控制模块的第二节点和所述电源输出模块的所述第一节点之间。所述滤波电容连接于所述集成电路控制模块的第二节点，其中所述磁珠组件的电阻为0奥姆。
依据本发明的实施例，所述电容单元包括至少两个并联的第一电容和第二电容，且所述第一电容和所述第二电容的电容值不同。
依据本发明的实施例，所述第一电容为钽电容。
依据本发明的实施例，所述第二电容为瓷介质电容。
依据本发明的实施例，所述磁珠组件的材料为铁镁、铁镍合金或者铁氧体。
本申请还提供一种电子设备，包括电源输出模块、集成电路控制模块、电容单元、磁珠组件和滤波电容。所述电源输出模块的第一节点用于输出电源信号。所述集成电路控制模块的第二节点用于输入所述电源信号。所述电容单元连接所述电源输出模块的所述第一节点。所述磁珠组件连接于所述集成电路控制模块的所述第二节点和所述电源输出模块的第一节点之间。所述滤波电容连接于所述集成电路控制模块的第二节点，其中所述磁珠组件的电阻为0奥姆。
本申请又提供一种电子设备，包括电源输出模块、集成电路控制模块、电容单元、磁珠组件和滤波电容。所述电源输出模块的第一节点用于输出电源信号。所述集成电路控制模块的第二节点用于输入所述电源信号。所述电容单元连接所述电源输出模块的所述第一节点。所述磁珠组件连接于所述集成电路控制模块的所述第二节点和所述电源输出模块的第一节点之间，其中所述磁珠组件和所述集成电路控制模块之间不设置电容。
依据本发明的实施例，所述第一电容为钽电容。
依据本发明的实施例，所述第二电容为瓷介质电容。
依据本发明的实施例，所述磁珠组件的材料为铁镁、铁镍合金或者铁氧体。
 有益效果
本申请的有益效果为：本申请提供的滤波电路的通过将磁珠组件的电阻设定为0奥姆，使得所述电源输出模块输出的电源信号在通过所述磁珠组件后，所述电源信号的波纹减少。而本申请的电子设备在所述磁珠组件和所述集成电路控制模块之间不设置电容，因此可避免形成串联谐振现象，进而解决现有技术的易产生电磁干扰现象、影响IC正常稳定工作的技术问题。
为了能更进一步了解本发明的特征以及技术内容，请参阅以下有关本发明的详细说明与附图，然而附图仅提供参考与说明用，并非用来对本发明加以限制。
 附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本申请一实施例的电子设备的结构示意图。
图2为本申请另一实施例的电子设备的结构示意图。
图3为本申请实施例提供的磁珠组件的结构示意图。
图4为本申请又一实施例的电子设备的结构示意图，
图5a和图5b分别绘示电源模块输出端与IC的电源输入引脚在通过传统滤波电路前后的波形图。
 本发明的实施方式
以下各实施例的说明是参考附加的图式，用以例示本发明可用以实施之特定实施例。本发明所提到的方向用语，例如“上”、“下”、“前”、“后”、“左”、“右”、“顶”、“底”、“水平”、“垂直”等，仅是参考附加图式的方向。因此，使用的方向用语是用以说明及理解本发明，而非用以限制本发明。
此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个所述特征。在本发明的描述中，“多个”的含义是两个或两个以上，除非另有明确具体的限定。
下文的公开提供了许多不同的实施方式或例子用来实现本发明的不同结构。为了简化本发明的公开，下文中对特定例子的部件和设置进行描述。当然，它们仅仅为示例，并且目的不在于限制本发明。此外，本发明可以在不同例子中重复参考数字和/或参考字母，这种重复是为了简化和清楚的目的，其本身不指示所讨论各种实施方式和/或设置之间的关系。此外，本发明提供了的各种特定的工艺和材料的例子，但是本领域普通技术人员可以意识到其他工艺的应用和/或其他材料的使用。
在下列段落中参照附图以举例方式更具体地描述本申请。根据下面说明和权利要求书，本发明的优点和特征将更清楚。需说明的是，附图均采用非常简化的形式且均使用非精准的比例，仅用以方便、明晰地辅助说明本申请实施例的目的。
请参见图1，图1为本申请一实施例的电子设备100的结构示意图，电子设备100包括电源输出模块20、集成电路控制模块30和滤波电路1。滤波电路1电性连接于电源输出模块20的第一节点N1和集成电路控制模块30的第二节点N2之间。电源输出模块20的第一节点N1用于输出电源信号。集成电路控制模块30的第二节点N2用于输入所述电源信号。电源输出模块20用于给集成电路控制模块30提供电流。因为在电流传输的过程中，为了滤除电流的交流信号，需要在电源输出模块20与集成电路控制模块30之间设置滤波电路1。滤波电路1用于降低所述电源信号的波纹或是降低EMI。
滤波电路1包括电容单元C、滤波电容C3和磁珠组件W1，磁珠组件W1可以为铁氧体磁珠滤波器，其可等效为电阻组件R和电感组件L。
进一步的，磁珠组件W1可以为铁氧体磁珠滤波器，其材料为铁镁、铁镍合金或者铁氧体。磁珠组件W1有很高的电阻率和磁导率，等效于电阻和电感串联，但电阻值和电感值都随频率变化，比普通的电感有更好的高频滤波特性，在高频时呈现阻性，所以能在相当宽的频率范围内保持较高的阻抗，从而提高调频滤波效果。在本实施例中，该磁珠组件W1的功能主要是消除存在于该电源输出模块20与集成电路控制模块30之间的传输线中的射频（Radio Frequency，RF）噪声，其中该RF噪声的能量是叠加在直流传输电平上的交流正弦波成分。磁珠组件W1用于消除这些不需要的信号能量，可选的，本申请实施例可选择片式磁珠组件以对高频噪声信号进行消除。本实施例将磁珠组件W1的电阻设定为0奥姆，使得电源输出模块20输出的电源信号在通过磁珠组件W1后，输入至集成电路控制模块30的所述电源信号的波纹减少。
为了让电容单元C能滤除不同的交流信号，电容单元C可以包括但不限于两个并联的第一电容C1和第二电阻C2，第一电容C1和第二电阻C2具有不同电容值。举例来说，电容单元C的第一电容C1可以是为大于或等于20μF的钽电容，用于滤除小于或等于200kHZ的交流信号。进一步的，第二电容C2可以是小于或等于0.1μF的瓷介质电容，用于滤除频率大于或等于1MHZ的交流信号。因为容值越大，相应阻抗越小，对应的滤波性能越好。而对于1MHZ以上的噪声信号，使用小容值的一类瓷介质电容进行滤除，保障该电容单元C的工作频率远远小于其自身的谐振频率。
图2为本申请另一实施例的电子设备200的结构示意图，电子设备200包括电源输出模块20、集成电路控制模块30和滤波电路1。滤波电路1电性连接于电源输出模块20的第一节点N1和集成电路控制模块30的第二节点N2之间。电源输出模块20的第一节点N1用于输出电源信号。集成电路控制模块30的第二节点N2用于输入所述电源信号。电源输出模块20用于给集成电路控制模块30提供电流。因为在电流传输的过程中，为了滤除电流的交流信号，需要在电源输出模块20与集成电路控制模块30之间设置滤波电路1。滤波电路1用于降低所述电源信号的波纹或是降低EMI。
滤波电路1包括电容单元C和磁珠组件W1，磁珠组件W1可以为铁氧体磁珠滤波器，其可等效为电阻组件R和电感组件L。磁珠组件W1可以为铁氧体磁珠滤波器，其材料为铁镁、铁镍合金或者铁氧体。磁珠组件W1有很高的电阻率和磁导率，等效于电阻和电感串联，但电阻值和电感值都随频率变化，比普通的电感有更好的高频滤波特性，在高频时呈现阻性，所以能在相当宽的频率范围内保持较高的阻抗，从而提高调频滤波效果。在本实施例中，该磁珠组件W1的功能主要是消除存在于该电源输出模块20与集成电路控制模块30之间的传输线中的射频（Radio Frequency，RF）噪声，其中该RF噪声的能量是叠加在直流传输电平上的交流正弦波成分。磁珠组件W1用于消除这些不需要的信号能量，可选的，本申请实施例可选择片式磁珠组件以对高频噪声信号进行消除。本实施例的电子装置200在磁珠组件W1和集成电路控制模块30之间不设置电容。如此一来，因为通过磁珠组件W1的电源信号不会经过连接到接地端的电容，因此在低频段时，不会形成LC串联谐振。因此本实施例的电子装置200不会让进入集成电路控制模块30的电源信号的纹波增大，不会影响集成电路控制模块30的稳定工作。
在一些实施例中，请参见图3，图3为本申请实施例提供的磁珠组件的结构示意图，所述电阻组件R包括多个并联的子电阻R1，所述子电阻R1的阻值的范围为0-10欧姆。具体的，鉴于磁珠组件有很高的电阻率，在此处设置多个并联的子电阻R1，以使该磁珠组件具有较高的电阻率，以提高其磁珠组件的高频噪音消除的效果。
除此之外，该磁珠组件W1中，所述电感组件L由外层瓷釉线圈制成，所述电感组件L的电感量的范围为0.1-2200微亨利。
请参见图4，图4为本申请又一实施例的电子设备300的结构示意图，在一些实施例中，滤波电路1还包括限流组件40，设置于磁珠组件W1与集成电路控制模块30之间，用于限制第二节点N2的电压值，以使所述第二节点N2的对地电压值不小于4V。具体的，该限流组件40可以为限流电阻，进而减小滤波电路的第一节点N1的电流，例如在磁珠组件W1的一端添加一个限流电阻可以减小流过的电流，防止损坏磁珠组件W1。
电子设备100、200和300可以为手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪等任何使用滤波功能的产品或部件。
 工业实用性
综上所述，本申请提供的滤波电路将磁珠组件的电阻设定为0奥姆，使得所述电源输出模块输出的电源信号在通过所述磁珠组件后，所述电源信号的波纹减少。而本申请的电子设备在所述磁珠组件和所述集成电路控制模块之间不设置电容，因此可避免形成串联谐振现象，进而解决现有技术的第一节点易产生电磁干扰现象、影响IC正常稳定工作的技术问题。
除上述实施例外，本申请还可以有其他实施方式。凡采用等同替换或等效替换形成的技术方案，均落在本申请要求的保护范围。

Claims (10)

  1.    一种滤波电路，连接于一电源输出模块和一集成电路控制模块之间，所述滤波电路包括:
    电容单元，连接所述电源输出模块的第一节点；
    磁珠组件，连接于所述集成电路控制模块的第二节点和所述电源输出模块的所述第一节点之间；以及
    滤波电容，连接于所述集成电路控制模块的所述第二节点，
    其中所述磁珠组件的电阻为0奥姆。
  2. 根据权利要求1所述的滤波电路，其中所述电容单元包括至少两个并联的第一电容和第二电容，且所述第一电容和所述第二电容的电容值不同。
  3. 根据权利要求1所述的滤波电路，其中所述第一电容为钽电容。
  4. 根据权利要求3所述的滤波电路，其中所述第二电容为瓷介质电容。
  5. 根据权利要求1所述的滤波电路，其中所述磁珠组件的材料为铁镁、铁镍合金或者铁氧体。
  6. 一种电子设备，其包括:
    电源输出模块，其第一节点用于输出电源信号；
    集成电路控制模块，其第二节点用于输入过滤后的所述电源信号；
    电容单元，连接所述电源输出模块的所述第一节点；
    磁珠组件，连接于所述集成电路控制模块的所述第二节点和所述电源输出模块的所述第一节点之间；以及
    滤波电容，连接于所述集成电路控制模块的第二节点，
    其中所述磁珠组件的电阻为0奥姆。
  7. 一种电子设备，其包括:
    电源输出模块，其第一节点用于输出电源信号；
    集成电路控制模块，其第二节点用于输入过滤后的所述电源信号；以及
    电容单元，连接所述电源输出模块的所述第一节点；以及
    磁珠组件，连接于所述集成电路控制模块的所述第二节点和所述电源输出模块的所述第一节点之间，
    其中所述磁珠组件和所述集成电路控制模块之间不设置电容。
  8. 根据权利要求7所述的电子设备，其中所述第一电容为钽电容。
  9. 根据权利要求8所述的电子设备，其中所述第二电容为瓷介质电容。
  10. 根据权利要求7所述的电子设备，其中所述磁珠组件的材料为铁镁、铁镍合金或者铁氧体。
PCT/CN2019/128700 2019-12-19 2019-12-26 滤波电路及电子设备 WO2021120275A1 (zh)

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