CN1257601C - 一种差模和共模集成滤波器 - Google Patents

一种差模和共模集成滤波器 Download PDF

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CN1257601C
CN1257601C CNB011211172A CN01121117A CN1257601C CN 1257601 C CN1257601 C CN 1257601C CN B011211172 A CNB011211172 A CN B011211172A CN 01121117 A CN01121117 A CN 01121117A CN 1257601 C CN1257601 C CN 1257601C
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magnetic core
type magnetic
integrated filter
common mode
mouth
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CN1391334A (zh
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胡跃全
冯江涛
陈为
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Delta Electronics Inc
Delta Optoelectronics Inc
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/38—Auxiliary core members; Auxiliary coils or windings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F37/00—Fixed inductances not covered by group H01F17/00
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/08—High-leakage transformers or inductances
    • H01F38/10—Ballasts, e.g. for discharge lamps
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/02—Adaptations of transformers or inductances for specific applications or functions for non-linear operation
    • H01F38/023—Adaptations of transformers or inductances for specific applications or functions for non-linear operation of inductances
    • H01F2038/026—Adaptations of transformers or inductances for specific applications or functions for non-linear operation of inductances non-linear inductive arrangements for converters, e.g. with additional windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H02M1/123—Suppression of common mode voltage or current
    • 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
    • H03H2001/0092—Inductor filters, i.e. inductors whose parasitic capacitance is of relevance to consider it as filter

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Filters And Equalizers (AREA)

Abstract

本发明涉及一种差模和共模集成滤波器。传统的集成滤波器存在着实施较为复杂等不足。本发明提供的差模和共模集成滤波器，包括磁芯、两线圈和用于绕制线圈的骨架，磁芯包括口型磁芯和I型磁芯，骨架扣在口型磁芯的框柱上，两线圈绕制在骨架，并且，I型磁芯横置于口型磁芯的窗口上，且位于两线圈之间。本发明还提供了日型磁芯与I型磁芯组合的结构。

Description

一种差模和共模集成滤波器
技术领域
本发明涉及一种滤波器，尤其涉及一种差模和共模集成滤波器。
背景技术
在开关电源中，由于电路工作在开关状态，不可避免地会产生电磁干扰信号，这些干扰信号分为辐射和传导两种情况。在传导干扰信号中，又分差模和共模干扰信号。这些信号不仅影响自身电路的正常工作，还会通过辐射或传导方式影响其他电器的工作。因而必须采取措施抑制这些干扰信号。
图1示出了干扰信号的种类与传导途径。如图1所示，传统的差模和共模滤波器一般由两个部分组成，其中一部分称共模滤波器，由电感器L101和L102组成，另一部分称为差模滤波器，由L103和L104组成。图1A示出了共模干扰信号的传导途径，此信号产生于线与地之间，因相位和幅值为相同，所以称为共模干扰信号。图1B示出了差模干扰信号的传导途径，此信号产生于线与线之间，称为差模干扰信号。通常采用大电感值滤波器L101和L102来抑制共模干扰信号，图中的电感器L101和L102就是绕在同一磁心上的共模电感。电感器L103和L104是分别串在电路当中用来抑制差模信号的电感。
图1所示的传统的滤波器是将共模滤波器和差模滤波器分立实现的。目前，在该技术领域中，发展出了一种将差共模滤波电感集成在同一磁心的新技术。图2为MOTOROLA公司开发的集成滤波器的结构图。其磁心包括一个E型磁心201和I型磁心202，两线圈203和204绕在I型磁心202上。图中箭头所指的磁通ΦDM和ΦCM分别为差模信号磁通和共模信号磁通。这种结构的好处是线圈骨架可以用一个，两个绕组可同时绕在其上。调节E型磁心201三个磁柱上的气隙便可调整差模和共模电感值。但这种有气隙的磁心结构会使共模电感值受到影响，因为共模信号磁通路径上的气隙实际上不可能完全为零。另外，由于差模磁通ΦDM与共模磁通ΦCM的路径在磁心的整个外围部分重合，这也会直接影响共模电感值，因为差模磁通会使得磁心的有效磁导率下降。
图3为Magnetek公司申请的美国专利(US5731666)所揭示的差共模集成方案。该差共模集成方案共有两种实现形式。图3A所示的实现形式与图2所示的MOTOROLA公司的集成滤波器的结构类似，只是其用一个U型磁心31和一个I型磁心50来代替了E型磁心，其中的I型磁心采用低磁导率材料。图3B示出了另一种实现形式。它是环形磁心310与I型磁心320结合而构成集成电感。在这两种形式中，I型磁心都必须放在环形磁心或者U型磁心的内部，这会给制造和装配带来困难，而且在环形磁心上绕线比较麻烦，生产效率必然会降低。
图4所示的是Powercube公司开发的差共模集成方案(其专利号为US05319343)。图4A、B中，绕组64和68和绕组66和70所形成的电感实际上是差模电感(76和78)和共模电感(72和74)的合成，如图4B所示。绕组62单独形成差模电感。该磁心结构和绕组布置的好处是中心柱上的绕组和绕在磁心上下部分的绕组彼此不影响，相互独立，而且中心柱上的磁通只跟绕组62有关。但这种方案在具体实施上还是很麻烦的。
发明内容
因此，本发明的目的在于提供一种实施较为方便的差模和共模集成滤波器。
根据本发明的上述目的，本发明提供一种差模和共模集成滤波器，包括磁心、两线圈和用于绕制线圈的骨架，所述磁心包括口型磁心和I型磁心，所述骨架扣在所述口型磁心的框柱上，两所述线圈绕制在所述骨架上，并且，所述I型磁心横置于所述口型磁心的窗口上，且位于两所述线圈之间。
根据本发明的上述目的，本发明还提供一种差模和共模集成滤波器，包括磁心、两线圈和用于绕制线圈的骨架，所述磁心包括日型磁心和I型磁心，所述骨架扣在所述日型磁心的中柱上，两所述线圈绕制在所述骨架上，并且，所述I型磁心卧置于所述日型磁心的窗口上，与所述日型磁心的中柱垂直，且位于两所述线圈之间。
如上所述，由于本发明采用了上述的结构，使得本发明这种结构的滤波器在实施时也较为容易。
附图说明
下面结合附图详细描述本发明的实施例。图中：
图1是用于图示干扰信号的种类和传导途径的示意图；
图2是已有技术中一种集成滤波器的结构示意图；
图3是已有技术中另一种集成滤波器的结构示意图；
图4是已有技术中再一种集成滤波器的结构示意图，其中，图4B是图4A的结构示意图的等效电路图；
图5示出了本发明的一种差模和共模集成滤波器的一个实施例的结构示意图；
图6是沿图5所示的A-A线的剖面放大图；
图7示出了本发明的一种差模和共模集成滤波器的再一个实施例的结构示意图。
具体实施方式
如图5所示的实施例，本发明的差模和共模集成滤波器包括一个口型磁心401和一个I型磁心402。绕制绕圈403和404的骨架405扣在口型磁心401的框柱上，I型磁心402横置于口型磁心401的窗口上，且使之位于两线圈403和404之间。这种结构的集成滤波器的制造方法可以如下：先准备一个口型磁心401和一个I型磁心402，然后，线圈骨架405扣在口型磁心401的框柱上，再将两个绕组线圈403和404绕制在该骨架405上，最后再将I型磁心402横置于口型磁心401的窗口上。从而形成如图5所示的集成滤波器。
在本实施例中，I型磁心402可以采用低磁导率、较高饱和磁密的材料制成，以适合差模信号的磁通，口型磁心401可以采用高磁导率材料制成，以更为有效地抑制共模信号。
图6是沿图5的A-A线的剖面放大图。从图6中可以看出，在I型磁心402与口型磁心401的接合处，可以设置非导磁垫片406，形成一定气隙，以调整差模电感值。当然也可以采用空气隔离的方式。
图7示出了本发明的差模和共模集成滤波器的另一个实施例的结构示意图。图7所示的实施例与图5所示的实施例差异在于，用日型磁心601代替了图5实施例中的口型磁心401。把I型磁心602卧置于日型磁心601的窗口上，使之与日型磁心601的中柱垂直，且位于两线圈603和604之间。
图7所示的实施例的其它组成和结构基本上与图5所示的实施例相同，例如，在I型磁心602与日型磁心601的接合处，可以设置垫片，也可以采用空气隔离的方式。
上面详细描述了本发明的具体实施例。但应当理解，本发明的实施方式并不仅限于这些实施例，这些实施例的描述仅用于帮助理解本发明的精神。在本发明所揭示的精神下，对本发明所作的各种变化例，都应包含在本发明的范围内。本发明的专利保护范围应当由所附的权利要求书来限定。

Claims (6)

1、一种差模和共模集成滤波器，包括磁心、两线圈和用于绕制线圈的骨架，其特征在于，所述磁心包括口型磁心和I型磁心，所述骨架扣在所述口型磁心的框柱上，两所述线圈绕制在所述骨架上，并且，所述I型磁心横置于所述口型磁心的窗口上，且位于两所述线圈之间。
2、如权利要求1所述的差模和共模集成滤波器，其特征在于，在所述I型磁心与所述口型磁心之间设置有非导磁垫片。
3、如权利要求1或2所述的差模和共模集成滤波器，其特征在于，所述I型磁心的磁导率低于所述口型磁心的高磁导率。
4、一种差模和共模集成滤波器，包括磁心、两线圈和用于绕制线圈的骨架，其特征在于，所述磁心包括日型磁心和I型磁心，所述骨架扣在所述日型磁心的中柱上，两所述线圈绕制在所述骨架，并且，所述I型磁心卧置于所述日型磁心的窗口上，与所述日型磁心的中柱垂直，且位于两所述线圈之间。
5、如权利要求4所述的差模和共模集成滤波器，其特征在于，在所述I型磁心与所述日型磁心之间设置有非导磁垫片。
6、如权利要求4或5所述的差模和共模集成滤波器，其特征在于，所述I型磁心的磁导率低于所述日型磁心的磁导率。
CNB011211172A 2001-06-08 2001-06-08 一种差模和共模集成滤波器 Expired - Fee Related CN1257601C (zh)

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US10/165,481 US6642672B2 (en) 2001-06-08 2002-06-07 Integrated filter with common-mode and differential-mode functions

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