CN214281344U - 可堆叠emi滤波器 - Google Patents
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Abstract
一种EMI滤波器,包括与可堆叠附加元件(120)可连接的主单元(115),所述主单元具有用于在功率源和电负载之间连接的连接器(51、52;53、54),通过所述功率源和所述电负载之间的所述连接器电可连接的功率导体(42、44),用于阻挡叠加在电源电压上的不希望的干扰信号的电感元件(L1‑L4);所述可堆叠附加元件包括印刷电路板(127)上的附加电路(20),所述印刷电路板(127)通过附加元件连接部件(32、34)永久电连接到所述功率导体(42、44),由此所述可堆叠附加元件被配置为堆叠在所述主单元上,由此所述印刷电路板在被堆叠时结合所述附加元件连接部件,而不中断所述功率导体(42、44)的电连续性。
Description
技术领域
本发明涉及抗电磁干扰的滤波器(EMI滤波器)。EMI滤波器的概念与电磁兼容性滤波器(EMC滤波器)、线路滤波器、EMI/EMC扼流圈和低通滤波器重叠,并且为了本公开的目的,EMI滤波器是它们的同义词。
背景技术
EMI滤波器的大多数应用涉及无源模块,所述模块沿供电导体插在设备和其功率源之间,所述供电导体既可以传输直流(DC)电源电流,也可以传输具有电力(utility)频率低于400Hz(通常处于50/60Hz)的交流(AC)电源电流。
低通滤波器应用于(come in)几乎无限多种的电路,其中的许多适合于用作EMI滤波器。DC或单相AC EMI滤波器通常具有两个线路端子和两个负载端子,它们通过包括导体和电感元件的低电阻路径内部连接。滤波器还包括分流元件,其通常是电容性或电阻性质的,由此电源电流将在很小或没有改变的情况下通过滤波器,并且发生在较高频率的电磁干扰被强烈衰减。通常,线路和负载端子之间的路径由厚规格的导体或实心母线所确保,以将欧姆损耗减到最少。
多相AC EMI滤波器也存在,并且本发明也适用于它们。这些设备中的线路和负载端子的数量对应于相的数量,可选地加上一对中性导体。
尽管EMI滤波器的端口通常表示为“线路”和“负载”或“输入”和“输出”,但是许多滤波器实际上是双向的,并且双向上衰减干扰。EMI滤波器并不限于直接插在供电线路和负载之间,而是在更复杂的装置中(诸如在电机驱动单元中)也能找到它们的位置。
除了它们的电气和滤波特性,EMI滤波器还必须满足对于尺寸、散热性、耐热性、对振动的抗扰度和许多其他参数的规格。在汽车应用中,其中电子元件越来越普遍,这些规格尤其严苛。因此,尽管底层电路明显简单,但是EMI滤波器是复杂的产品,其很难针对所有可能的应用进行设计和定制。
发明内容
本发明提出了一种可堆叠的滤波器,所述滤波器可以通过将不同的附加元件(add-on)模块叠加到基础单元上来适应不同的应用。EMI滤波器包括与可堆叠附加元件(120)可连接的主单元(115),所述主单元具有用于在功率源和电负载之间连接的连接器(51、52;53、54),通过所述功率源和所述电负载之间的所述连接器电可连接的功率导体(42、44),用于阻挡叠加在电源电压上的不希望的干扰信号的电感元件(L1-L4);所述可堆叠附加元件包括印刷电路板(127)上的附加电路(20),所述印刷电路板(127)通过附加元件连接部件(32、34)永久电连接到所述功率导体(42、44),由此所述可堆叠附加元件被配置为堆叠在所述主单元上,由此所述印刷电路板在被堆叠时结合所述附加元件连接部件,而不中断所述功率导体(42、44)的电连续性。
可选地,根据本发明的一个实施例,所述功率导体是实心母线。
可选地,根据本发明的一个实施例,所述附加元件连接部件是导电柱,所述导电柱从与其电接触的所述母线升起。
可选地,根据本发明的一个实施例,所述附加元件连接部件与所述母线整体地构建,或者焊接到所述母线,或者熔接到所述母线,或者压配合紧固到所述母线,或者压在所述母线上。
可选地,根据本发明的一个实施例,所述附加电路(20)改善在确定频带中的衰减,或者抑制谐振,或者增加功能。
可选地,根据本发明的一个实施例,所述附加电路(20)包括在电源线路和接地之间的电容器,和/或线路间电容器,和/或阻尼电阻器,和/或RLC网络,和/或有源元件。
可选地,根据本发明的一个实施例,所述主单元是具有作为功率导体的一对母线的DC或单相AC单元,其包括与作为电感元件的功率母线磁耦合的磁芯,以及线路到接地电容器,所述线路到接地电容器用于分路不需要的干扰分量,并且所述可堆叠附加元件单元包括串联或并联的附加的线路到接地和线路到线路电容器以及阻尼电阻器。
可选地,根据本发明的一个实施例,所述主单元是安装在电缆上的滤波器,其配置为安装在负载侧上的或线路侧上的一对电缆导体上,其中柔性导体与所述EMI滤波器的磁芯磁耦合并插入所述磁芯中。
根据本发明,这些目的通过所附权利要求的客体来实现。
附图说明
在说明书中公开了本发明的示例性实施例,并通过附图来示出,在所述附图中:
图1a示意性地示出了EMI滤波器的电路。
图1b和1c示出了由于包括附加元件而具有不同于图1a的电特性的滤波器。
图2示出了本发明的可堆叠滤波器。
具体实施方式
图1a表示DC或单相EMI滤波器15。为了简洁起见,本公开将参考这种类型的设备,但应理解的是,本发明还包括多相滤波器。滤波器具有用于连接到电源线路的线路端子51、52,以及用于向未表示的负载提供经滤波的功率的负载端子53、54。线路和负载通过母线42、44或其他合适的功率导体连接,电感元件L1-L4插入在母线42、44中。
电容器C1,C2分路到接地不需要的干扰电流。它们连接在母线41、42和接地之间,或者在干扰发生的频率下连接在适当低阻抗的另一个节点上。
EMI滤波器15可以被包括在本发明的滤波器的基础单元中,如将在下文中公开的。
图1b示出了具有滤波器15的所有元件以及附加分路元件20的滤波器。分路元件包括母线和接地之间的两个附加分路元件:R2、C4(相应为R3、C5)以及由R1和C3组成的线路到线路分路器。
在呈现的示例中,附加元件各自通过串联的电容器和电阻器组成,以用于改善衰减和阻尼,但是这不是必需的,并且本发明不限于此。在其他未表示的变型中,附加元件20可以具有与电抗组件并联的阻尼电阻器,而不是如所示的串联的阻尼电阻器,或者简单地由连接在线路与线路之间的或线路与接地之间的、与主电路15中的电容器并联电连接的阻尼电阻器组成,或者简单地由线路与接地之间的或线路与线路之间的电容器组成。附加组件还可以包括任何拓扑的RLC网络和有源元件。
向滤波器15附加分路组件20改变了滤波器的传递函数和/或修改了其性能,可能改善了某些期望频带中的衰减,抑制了谐振,或者借助于有源元件增加了某些功能。
附加元件20可以被包括在根据本发明的可堆叠附加元件中,如将在后面解释的。
图1c示出了如何在不损害母线22、24的连续性的情况下将附加元件20添加到原始滤波器15中。附加元件20和原始滤波器15可以方便地保持在不同的水平,并且通过两个导电元件32、34确保连接,所述两个导电元件依靠母线42、44到附加电路20的合适节点。导体32、34在干扰发生的频率下应具有低阻抗,但是它们在DC或低频下不会被负载电流所穿过,并且它们不会对功率损耗产生明显的影响。原始电路15的和附加元件20的接地点之间的电连续性是暗示的。
图2示出了本发明的可堆叠滤波器,其具有基础元件15和可堆叠在主元件上的附加元件120,所述基础元件15包括用于线路和负载端子、母线、电感元件以及可能的分路元件的连接器,所述附加元件120具有包括安装在PCB 127上的附加电子元件(诸如例如上面所示的附加电路20)的电路。组件还包括两个导体元件132、134,所述两个导体元件132、134依赖于基础元件15的侧上的母线或连接器,并且与可堆叠附加元件的印刷电路板相接。用于接地的第三电连接可以通过使用专用导体或基础元件115的金属底盘来获得。在所呈现的示例中,接地连接器138被焊接在PCB 127的对应孔128中,并且被拧到主滤波器单元115的合适接地点。
接触元件134、132可以是母线结构的整体部分(来自于相同的铜部分),或者是熔接到母线、焊接到母线或者通过干扰和摩擦(压配合)紧固到母线的独立元件。接触元件也可以是压在母线上的独立部分。元件134、132和电路板127中的对应轨道之间的接触优选是焊接或压配合的。图2的示例在PCB 127中具有孔122、124,以用于接收和焊接接触元件134、132。
图2的主单元是用于汽车应用的电缆安装式EMI滤波器,其配置为与负载侧上的或线路侧上的一对柔性导体耦合。导体穿过磁芯137的中心孔,并被紧固到主单元115的螺钉端子(图中不可见)。主单元115具有穴139,以用于插入螺丝刀或其他合适的工具,并拧紧螺钉端子。同样,可堆叠附加元件120的PCB具有与主单元115的对应检查穴(accessaperture)139对齐的穴129,以允许螺丝刀插入。
图2中所示的可堆叠滤波器是高度集成且紧凑的设备,并且要对其进行重新设计以改变其性能非常困难。本发明通过将相同的基础单元与不同的可堆叠的附加元件相组合在相同的封装中或兼容的封装中提供了具有不同性能的滤波器的搭配。
此外,可堆叠附加元件120的附加以期望的方式改善了基础单元115的特性,而不影响母线设计、机械接口、连接器和磁芯设计。因此,本发明允许以较少的设计和工程努力来改善EMI滤波器性能,并提供定制的滤波器。
附图中的参考符号
15主电路
20附加电路
32导体
34导体
42母线
44母线
51线路端子
52线路端子
53负载端子
54负载端子
115主单元
120可堆叠附加元件
122 PCB孔
124 PCB孔
127印刷电路板
128 PCB孔
129螺丝刀检查穴
132导体、连接销
134导体、连接销
137磁芯
138接地导体
139螺丝刀检查穴
Claims (8)
1.一种EMI滤波器,其特征在于,包括与可堆叠附加元件(120)可连接的主单元(115),所述主单元具有用于在功率源和电负载之间连接的连接器(51、52;53、54),通过所述功率源和所述电负载之间的所述连接器电可连接的功率导体(42、44),用于阻挡叠加在电源电压上的不希望的干扰信号的电感元件(L1-L4);所述可堆叠附加元件包括印刷电路板(127)上的附加电路(20),所述印刷电路板(127)通过附加元件连接部件(32、34)永久电连接到所述功率导体(42、44),由此所述可堆叠附加元件被配置为堆叠在所述主单元上,由此所述印刷电路板在被堆叠时结合所述附加元件连接部件,而不中断所述功率导体(42、44)的电连续性。
2.根据权利要求1所述的EMI滤波器,其特征在于,所述功率导体是实心母线。
3.根据权利要求2所述的EMI滤波器,其特征在于,所述附加元件连接部件是导电柱,所述导电柱从与其电接触的所述母线升起。
4.根据权利要求3所述的EMI滤波器,其特征在于,所述附加元件连接部件与所述母线整体地构建,或者焊接到所述母线,或者熔接到所述母线,或者压配合紧固到所述母线,或者压在所述母线上。
5.根据权利要求1所述的EMI滤波器,其特征在于,所述附加电路(20)改善在确定频带中的衰减,或者抑制谐振,或者增加功能。
6.根据权利要求1所述的EMI滤波器,其特征在于,所述附加电路(20)包括在电源线路和接地之间的电容器,和/或线路间电容器,和/或阻尼电阻器,和/或RLC网络,和/或有源元件。
7.根据权利要求1所述的EMI滤波器,其特征在于,所述主单元是具有作为功率导体的一对母线的DC或单相AC单元,其包括与作为电感元件的功率母线磁耦合的磁芯,以及线路到接地电容器,所述线路到接地电容器用于分路不需要的干扰分量,并且所述可堆叠附加元件单元包括串联或并联的附加的线路到接地和线路到线路电容器以及阻尼电阻器。
8.根据权利要求7所述的EMI滤波器,其特征在于,所述主单元是安装在电缆上的滤波器,其配置为安装在负载侧上的或线路侧上的一对电缆导体上,其中柔性导体与所述EMI滤波器的磁芯磁耦合并插入所述磁芯中。
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CN202021807330.9U CN214281344U (zh) | 2020-08-26 | 2020-08-26 | 可堆叠emi滤波器 |
ES202130714A ES2897005B2 (es) | 2020-08-26 | 2021-07-23 | Filtro emi apilable |
DE202021103955.8U DE202021103955U1 (de) | 2020-08-26 | 2021-07-23 | Stapelbares Entstörfilter |
ATGM8035/2022U AT17874U1 (de) | 2020-08-26 | 2021-08-12 | Stapelbares Entstörfilter |
ATA137/2021A AT524151A3 (de) | 2020-08-26 | 2021-08-12 | Stapelbares Entstörfilter |
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DE102005013509C5 (de) * | 2004-03-30 | 2024-08-29 | Schaffner Emv Ag | EMV Filter |
JP2014120518A (ja) * | 2012-12-13 | 2014-06-30 | Nec Tokin Corp | インダクタンス素子及びノイズフィルタ |
CN107005147B (zh) * | 2014-12-18 | 2020-09-04 | 瑞典爱立信有限公司 | 具有紧凑型emi滤波器的电源接口模块 |
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US10917992B2 (en) * | 2017-01-13 | 2021-02-09 | Cree Fayetteville, Inc. | High power multilayer module having low inductance and fast switching for paralleling power devices |
DE102017105839A1 (de) * | 2017-03-17 | 2018-09-20 | Schaffner Emv Ag | Aktives Filter |
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CN111490323B (zh) * | 2020-05-13 | 2021-06-25 | 合肥巨一动力系统有限公司 | 一种集成式母线emc滤波结构 |
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