CN209267444U - A Switching Power Supply EMI Filter Targeted to Suppress Narrowband Spectrum - Google Patents
A Switching Power Supply EMI Filter Targeted to Suppress Narrowband Spectrum Download PDFInfo
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Abstract
Description
技术领域technical field
本实用新型属于开关电源电磁兼容技术领域，涉及一种针对性抑制窄带频谱的开关电源EMI滤波器。The utility model belongs to the technical field of switching power supply electromagnetic compatibility, and relates to a switching power supply EMI filter for targeted suppression of narrow-band spectrum.
背景技术Background technique
开关电源因为其重量轻、体积小，效率高的特点，成功跻身为当下电力电子技术行业最热门的研究领域，但随着研究的深入，其中的电磁干扰问题也越来越突出，尤其是传导EMI很严重。EMI滤波器是抑制传导电磁干扰的经典设备，传统的无源EMI滤波器是由串联在线路中的电感和并联在线路中的电容形成的滤波方式，这种滤波器不仅体积大、功耗大，并且对于电磁干扰频谱的窄带频谱选择性差。基于此，本实用新型提出一种针对性抑制窄带频谱的开关电源EMI滤波器，该滤波器打破了在开关电源供电线路上实际对接EMI滤波电路的模式，通过一个高频磁环把电磁干扰传感到磁环感应线圈上，在磁环感应线圈中串接多频谐振支路方式实现对电磁干扰窄带频谱的针对性抑制。这种EMI滤波器不仅可大幅度减小EMI滤波器的体积和功耗，更重要的是能够实现EMI干扰特定窄带频谱的有针对性的抑制。Because of its light weight, small size and high efficiency, switching power supply has successfully become the most popular research field in the current power electronics technology industry. However, with the deepening of research, the problem of electromagnetic interference has become more and more prominent, especially the conduction EMI is serious. EMI filter is a classic device for suppressing conducted electromagnetic interference. The traditional passive EMI filter is a filtering method formed by an inductor connected in series in the line and a capacitor connected in parallel in the line. This filter is not only large in size but also consumes a lot of power. , and has poor narrow-band spectral selectivity for the EMI spectrum. Based on this, the utility model proposes a switching power supply EMI filter that suppresses narrow-band spectrum in a targeted manner. On the magnetic ring induction coil, the multi-frequency resonance branch is connected in series in the magnetic ring induction coil to realize the targeted suppression of the narrow-band spectrum of electromagnetic interference. This EMI filter can not only greatly reduce the volume and power consumption of the EMI filter, but more importantly, it can realize targeted suppression of EMI interference in a specific narrow-band spectrum.
实用新型内容Utility model content
本实用新型的目的是提供一种针对性抑制窄带频谱的开关电源EMI滤波器，该EMI滤波器不仅可大幅度减小EMI滤波器的体积和功耗，更重要的是能够实现EMI干扰特定窄带频谱的有针对性的抑制。The purpose of this utility model is to provide a switching power supply EMI filter that suppresses the narrowband spectrum in a targeted manner. The EMI filter can not only greatly reduce the volume and power consumption of the EMI filter, but more importantly, it can realize the specific narrowband EMI interference. Spectrum targeted suppression.
本实用新型所采用的技术方案是，一种针对性抑制窄带频谱的开关电源EMI滤波器，包括套接在开关电源供电线路L上的高频磁环，高频磁环上缠绕有磁环感应线圈Lg，磁环感应线圈Lg上连接有谐振元件组。The technical solution adopted by the utility model is, a switching power supply EMI filter for suppressing narrow-band spectrum in a targeted manner, including a high-frequency magnetic ring socketed on the switching power supply line L, and a magnetic ring induction coil is wound on the high-frequency magnetic ring Coil L g , a resonant element group is connected to the magnetic ring induction coil L g .
本实用新型的特点还在于，The utility model is also characterized in that,
开关电源供电线路L有电流I通过，磁环感应线圈Lg能够吸收高频磁环中流过的电流I所产生的传导型电磁干扰，谐振元件组会在不同的谐振状态下产生多个截止频率，从而对不同频段的电磁干扰进行有效的抑制。The switching power supply line L has a current I passing through it, and the magnetic ring induction coil Lg can absorb the conductive electromagnetic interference generated by the current I flowing in the high-frequency magnetic ring, and the resonant element group will generate multiple cut-off frequencies in different resonance states , so as to effectively suppress the electromagnetic interference of different frequency bands.
谐振元件组包括三组谐振支路，分别为谐振支路I、谐振支路II及谐振支路III，谐振支路I、谐振支路II及谐振支路III分别与磁环感应线圈Lg串联。The resonant component group includes three sets of resonant branches, which are respectively resonant branch I, resonant branch II and resonant branch III, and resonant branch I, resonant branch II and resonant branch III are respectively connected in series with the magnetic ring induction coil L g .
谐振支路I包括依次连接的多频谐振支路电感L1、多频谐振支路电容C1、多频谐振支路接入功耗电阻R1，多频谐振支路电感L1和多频谐振支路接入功耗电阻R1分别连接在磁环感应线圈Lg的两端。The resonant branch I includes multi-frequency resonant branch inductance L 1 , multi-frequency resonant branch capacitor C 1 , multi-frequency resonant branch access power consumption resistor R 1 , multi-frequency resonant branch inductance L 1 and multi-frequency resonant branch connected in sequence. The resonant branch connected to the power dissipation resistor R1 is respectively connected to both ends of the magnetic ring induction coil Lg .
谐振支路II包括依次连接的多频谐振支路电感L2、多频谐振支路电容C2、多频谐振支路接入功耗电阻R2，多频谐振支路电感L2和多频谐振支路接入功耗电阻R2分别连接在磁环感应线圈Lg的两端。The resonant branch II includes multi-frequency resonant branch inductance L 2 , multi-frequency resonant branch capacitor C 2 , multi-frequency resonant branch access power consumption resistor R 2 , multi-frequency resonant branch inductance L 2 and multi-frequency resonant branch connected in sequence. The resonant branch connected to the power dissipation resistor R2 is respectively connected to both ends of the magnetic ring induction coil Lg .
谐振支路III包括依次连接的多频谐振支路电感L3、多频谐振支路电容C3、多频谐振支路接入功耗电阻R3；多频谐振支路电感L3和多频谐振支路接入功耗电阻R3分别连接在磁环感应线圈Lg的两端。Resonant branch III includes multi-frequency resonant branch inductance L 3 , multi-frequency resonant branch capacitor C 3 , multi-frequency resonant branch access power consumption resistor R 3 connected in sequence; multi-frequency resonant branch inductance L 3 and multi-frequency resonant branch The resonant branch connected to the power dissipation resistor R3 is respectively connected to both ends of the magnetic ring induction coil Lg .
本实用新型的有益效果是，本实用新型中的滤波器装置解决了传统的无源EMI滤波器体积大、功耗大，并且对于电磁干扰频谱的特定窄带频谱选择性差的问题，同时，该滤波器打破了在开关电源供电线路上实际对接EMI滤波电路的滤波模式，通过一个高频磁环把电磁干扰传感到磁环感应线圈上，在磁环感应线圈中串接多频谐振支路的方式实现对电磁干扰特定窄带频谱的有针对性的抑制。并且，对于已经安装好的结构不能改变的中大型开关电源设备，该EMI滤波方式不仅能够保证滤波器安装的便捷性，更能有针对性的抑制超标的窄带电磁干扰频谱。The beneficial effects of the utility model are that the filter device in the utility model solves the problem that the traditional passive EMI filter has large volume, high power consumption, and poor selectivity to specific narrowband spectrum of the electromagnetic interference spectrum. At the same time, the filter The device breaks the filtering mode of actually docking the EMI filter circuit on the power supply line of the switching power supply. The electromagnetic interference is sensed to the magnetic ring induction coil through a high-frequency magnetic ring, and the multi-frequency resonance branch is connected in series in the magnetic ring induction coil. Enables targeted suppression of specific narrowband spectrum of EMI. Moreover, for medium and large switching power supply equipment whose installed structure cannot be changed, this EMI filtering method can not only ensure the convenience of filter installation, but also specifically suppress the excessive narrowband electromagnetic interference spectrum.
附图说明Description of drawings
图1本实用新型的一种针对性抑制窄带频谱的开关电源EMI滤波器的电路拓扑图。Fig. 1 is a circuit topology diagram of a switching power supply EMI filter targeted at suppressing narrow-band spectrum of the present invention.
图中，1.开关电源供电线路L,2.高频磁环,3.磁环感应线圈Lg,4.谐振支路I，5.谐振支路II，6.谐振支路III。In the figure, 1. Switching power supply line L, 2. High-frequency magnetic ring, 3. Magnetic ring induction coil L g , 4. Resonant branch I, 5. Resonant branch II, 6. Resonant branch III.
具体实施方式Detailed ways
下面结合附图和具体实施方式对本实用新型进行详细说明。The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
本实用新型一种针对性抑制窄带频谱的开关电源EMI滤波器，如图1所示，该装置通过一个高频磁环2把电磁干扰传感到磁环感应线圈Lg 3上，在磁环感应线圈Lg 3串接多频谐振支路方式实现对电磁干扰特定窄带频谱的有针对性的抑制。多频谐振支路中，每组谐振支路包括多频谐振支路电感、多频谐振支路电容及多频谐振支路接入功耗电阻。这种EMI滤波器不仅可大幅度减小EMI滤波器的体积和功耗，更重要的是能够实现EMI干扰特定窄带频谱的有针对性的抑制。解决了传统的无源EMI滤波器体积大、功耗大，并且对于电磁干扰频谱的窄带频谱选择性差的问题，同时，该滤波器打破了在开关电源供电线路上实际对接EMI滤波电路的模式，通过一个高频磁环把电磁干扰传感到磁环感应线圈Lg 3上，对于已经安装好的结构不能改变的中大型开关电源，该EMI滤波方式不仅能够保证滤波器后装的便捷性，更能有针对性的抑制超标的窄带电磁干扰频谱。The utility model is a switching power supply EMI filter for suppressing narrow-band spectrum, as shown in Figure 1, the device senses the electromagnetic interference to the magnetic ring induction coil L g 3 through a high-frequency magnetic ring 2, and the magnetic ring induction Coil L g 3 is connected in series with multi-frequency resonant branches to achieve targeted suppression of specific narrow-band spectrum of electromagnetic interference. In the multi-frequency resonance branch, each group of resonance branch includes multi-frequency resonance branch inductance, multi-frequency resonance branch capacitance and multi-frequency resonance branch connection power consumption resistance. This EMI filter can not only greatly reduce the volume and power consumption of the EMI filter, but more importantly, it can realize targeted suppression of EMI interference in a specific narrow-band spectrum. It solves the problem that the traditional passive EMI filter has large volume, high power consumption, and poor selectivity to the narrow-band spectrum of the electromagnetic interference spectrum. At the same time, the filter breaks the mode of actually connecting the EMI filter circuit on the switching power supply line, The electromagnetic interference is sensed to the magnetic ring induction coil L g 3 through a high-frequency magnetic ring. For medium and large switching power supplies whose installed structure cannot be changed, this EMI filtering method can not only ensure the convenience of post-installation of the filter, but also It can specifically suppress the narrow-band electromagnetic interference spectrum that exceeds the standard.
本实用新型一种针对性抑制窄带频谱的开关电源EMI滤波器，从图1可知，滤波器的高频磁环2套在了开关电源供电线路L 1上，开关电源供电线路L 1有电流I通过，高频磁环2上的磁环感应线圈Lg 3会吸收高频磁环2中流过的电流I所产生的传导型电磁干扰，磁环感应线圈Lg 3与谐振元件组相连，谐振元件组会在不同的谐振状态下产生多个截止频率，从而对不同频段的电磁干扰进行有效的抑制。The utility model is a switching power supply EMI filter that suppresses the narrowband spectrum in a targeted manner. As can be seen from Figure 1, the high-frequency magnetic ring 2 of the filter is set on the switching power supply power supply line L1, and the switching power supply power supply line L1 has a current I Through, the magnetic ring induction coil L g 3 on the high-frequency magnetic ring 2 can absorb the conductive electromagnetic interference produced by the current I flowing through the high-frequency magnetic ring 2, the magnetic ring induction coil L g 3 is connected with the resonant element group, and the resonance The component group will generate multiple cut-off frequencies in different resonance states, so as to effectively suppress electromagnetic interference in different frequency bands.
图中的磁环感应线圈Lg 3与三组谐振支路相连，谐振支路I4包括多频谐振支路电感L1、多频谐振支路电容C1、多频谐振支路接入功耗电阻R1；多频谐振支路电感L1和多频谐振支路接入功耗电阻R1分别连接在磁环感应线圈Lg的两端。The magnetic ring induction coil L g 3 in the figure is connected to three groups of resonant branches, and the resonant branch I4 includes multi-frequency resonant branch inductance L 1 , multi-frequency resonant branch capacitor C 1 , multi-frequency resonant branch access power consumption The resistor R 1 ; the multi-frequency resonant branch inductance L 1 and the multi-frequency resonant branch access power consumption resistor R 1 are respectively connected to both ends of the magnetic ring induction coil L g .
谐振支路II5包括依次连接的多频谐振支路电感L2、多频谐振支路电容C2、多频谐振支路接入功耗电阻R2；多频谐振支路电感L2和多频谐振支路接入功耗电阻R2分别连接在磁环感应线圈Lg的两端。The resonant branch II5 includes multi-frequency resonant branch inductance L 2 , multi-frequency resonant branch capacitor C 2 , multi-frequency resonant branch access power consumption resistor R 2 connected in sequence; multi-frequency resonant branch inductance L 2 and multi-frequency resonant branch The resonant branch connected to the power dissipation resistor R2 is respectively connected to both ends of the magnetic ring induction coil Lg .
谐振支路III6包括依次连接的多频谐振支路电感L3、多频谐振支路电容C3、多频谐振支路接入功耗电阻R3。多频谐振支路电感L3和多频谐振支路接入功耗电阻R3分别连接在磁环感应线圈Lg的两端。The resonant branch III6 includes a multi-frequency resonant branch inductance L 3 , a multi-frequency resonant branch capacitor C 3 , and a multi-frequency resonant branch access power consumption resistor R 3 connected in sequence. The multi-frequency resonant branch inductance L 3 and the multi-frequency resonant branch access power consumption resistor R 3 are respectively connected to both ends of the magnetic ring induction coil L g .
三组谐振支路与磁环感应线圈Lg 3串接在一起。通过调整每个谐振支路中元件的参数值，可以针对不同的工况中的实际需求，设计出不同的截止频率，从而有针对性的抑制超标的窄带电磁干扰频谱。The three sets of resonant branches are connected in series with the magnetic ring induction coil L g 3 . By adjusting the parameter values of the components in each resonance branch, different cut-off frequencies can be designed according to the actual needs in different working conditions, so as to suppress the excessive narrow-band electromagnetic interference spectrum in a targeted manner.
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| CN112946433A (en) * | 2021-01-29 | 2021-06-11 | 云南电网有限责任公司电力科学研究院 | Cubical switchboard partial discharge signal prevents diffusion equipment |
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| CN112946433A (en) * | 2021-01-29 | 2021-06-11 | 云南电网有限责任公司电力科学研究院 | Cubical switchboard partial discharge signal prevents diffusion equipment |
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