A non-magnetic power filter for nuclear magnetic resonance gradient power supplies

Abstract

This utility model discloses a non-magnetic power supply filter for nuclear magnetic resonance gradient power supplies, belonging to the field of electromagnetic compatibility filter technology. It consists of ten identical filter branches arranged in parallel, each branch forming a first-level filter channel. The structure of each channel is as follows: the signal enters from the input pin Ln, first passing through the left-side through-hole capacitor C1, the other end of which serves as the output. The output of the left-side through-hole capacitor C1 is connected in series with an inductor L. The other end of the inductor L is connected to one end of the middle through-hole capacitor C1, and the output of the middle through-hole capacitor C1 is connected in series with another inductor L. The other end of the other inductor L is connected to one end of the right-side through-hole capacitor C1, and the output of the right-side through-hole capacitor C1 is connected to the output pin Ln'. This utility model solves the problems of large space occupation, complex installation and wiring, excessive wiring that easily introduces additional interference, and inconsistent performance of each filter.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic compatibility (EMC) filter technology, specifically to a non-magnetic power filter for nuclear magnetic resonance gradient power supplies. Background Technology

[0002] Precision medical instruments such as MRI scanners contain numerous electronic modules sensitive to electromagnetic interference, requiring a highly clean power supply environment for stable operation. Simultaneously, the equipment itself generates strong electromagnetic noise, which must be effectively suppressed to comply with electromagnetic compatibility regulations.

[0003] The traditional approach involves installing a separate filter for each power circuit that requires filtering. This approach suffers from problems such as large space requirements, complex installation and wiring, excessively long wiring that can introduce additional interference, and inconsistent performance among the filters, which affect the overall reliability and image quality.

[0004] Based on this, this invention designs a non-magnetic power supply filter for nuclear magnetic resonance gradient power supplies to solve the above problems. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a non-magnetic power supply filter for nuclear magnetic resonance gradient power supply.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A non-magnetic power supply filter for nuclear magnetic resonance gradient power supplies consists of ten identical filter branches arranged in parallel, each branch forming a self-contained filter channel. The structure of each channel is as follows: the signal enters from the input pin Ln (n=1~10), first passing through the left-side through-hole capacitor C1. The mounting end of the left-side through-hole capacitor C1 is directly connected to the input pin Ln, and the other end of the left-side through-hole capacitor C1 serves as the output and simultaneously grounds the casing. The output end of the left-side through-hole capacitor C1 is connected in series with an inductor L. The other end of the inductor L is connected to one end of the middle through-hole capacitor C1, and the output end of the middle through-hole capacitor C1 is connected in series with another inductor L, and the middle through-hole capacitor C1 is grounded. The other end of the other inductor L is connected to one end of the right-side through-hole capacitor C1, and the output end of the right-side through-hole capacitor C1 is connected to the output pin Ln', and the right-side through-hole capacitor C1 is grounded.

[0007] Furthermore, the capacitance of the inductor L is 0.5uH; a non-magnetic air-core inductor is used.

[0008] Furthermore, the capacitance of the feedthrough capacitor C1 is 0.033uF; a high-voltage feedthrough capacitor is used.

[0009] Furthermore, it also includes the filter housing, with the through-core capacitor C1 fixedly mounted on the filter housing by fasteners.

[0010] Furthermore, fasteners include flat washers, spring washers, and nuts.

[0011] Furthermore, the inductor L is connected to the through-core capacitor C1 by welding and fixed inside the filter housing.

[0012] Furthermore, the filter housing is made of metal.

[0013] Compared with the prior art, the advantages of this utility model are as follows: magnetic weakening characteristics: This filter has magnetic weakening characteristics and uses non-magnetic fasteners and inductors and capacitors.

[0014] High integration and compact design: The multi-channel filtering circuit is highly integrated into a single metal casing, which realizes the miniaturization and weight reduction of the equipment, saving installation space inside precision instruments such as nuclear magnetic resonance equipment that have strict space requirements.

[0015] Excellent electromagnetic compatibility (EMC) performance: Designed and tested according to international standard (IEC 60939-3), it has excellent interference suppression performance, effectively filters out common-mode and differential-mode noise on the power line, ensures the stable operation of high-sensitivity instruments such as nuclear magnetic resonance equipment, and prevents image interference and data errors.

[0016] High reliability and long lifespan: The all-metal casing (aluminum plate optional) provides excellent electromagnetic shielding and heat dissipation. Key parameters such as high insulation resistance (≥500MΩ), high test voltage (2250VDC), and high mean time between failures (MTBF: 150,000 hours @ 40℃) ensure the long-term stability and reliability of the product in harsh working environments.

[0017] Easy installation and maintenance: The integrated design simplifies the user's procurement, inventory management, and installation process. It reduces the risk of wiring errors and improves overall assembly efficiency.

[0018] Wide environmental adaptability: Wide operating temperature range (-25℃ ~ +85℃), wide humidity range (0~90%RH) and high altitude (2000m) adaptability enable it to meet the requirements of a variety of harsh industrial environments, especially the environmental characteristics of medical equipment rooms. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a circuit diagram of a non-magnetic power supply filter for a nuclear magnetic resonance gradient power supply according to the present invention. Figure 2 This is an internal structural diagram of a non-magnetic power filter for a nuclear magnetic resonance gradient power supply according to the present invention.

[0021] Figure 3 This is an external structural diagram of a non-magnetic power filter for a nuclear magnetic resonance gradient power supply according to the present invention.

[0022] The labels in the diagram represent: 1: filter housing; C1: through-core capacitor; 2: fastener; L: inductor. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0024] The terms "left," "right," "front," "back," "up," and "down" used in the following description refer to the orientation from the perspective of the front view.

[0025] Example 1: In some embodiments, please refer to the accompanying drawings. Figures 1-3A non-magnetic power supply filter for nuclear magnetic resonance gradient power supplies is an EMI filter composed of ten independent parallel filtering units. It consists of ten identical filtering branches arranged in parallel, each branch forming its own filtering channel. The structure of each channel is as follows: the signal enters from the input pin Ln (n=1~10), first passing through the left-side through-hole capacitor C1. The mounting end of the left-side through-hole capacitor C1 is directly connected to the input pin Ln, while the other end of the left-side through-hole capacitor C1 serves as the output and simultaneously grounds the casing. The output end of the left-side through-hole capacitor C1 is connected in series with an inductor L. The other end of inductor L is connected to one end of the middle through-hole capacitor C1, and the output end of the middle through-hole capacitor C1 is connected in series with another inductor L. The middle through-hole capacitor C1 is grounded. The other end of the other inductor L is connected to one end of the right-side through-hole capacitor C1, and the output end of the right-side through-hole capacitor C1 is connected to the output pin Ln'. The right-side through-hole capacitor C1 is also grounded.

[0026] The filter element parameters and connection methods of all channels are completely consistent, forming a highly symmetrical layout. Through comprehensive suppression of common-mode and differential-mode interference, it is ensured that the signal of each channel is cleanly output from the corresponding output pin after filtering.

[0027] Preferably, the capacitance of the inductor L is 0.5uH; a non-magnetic air-core inductor is used. The capacitance of the feedthrough capacitor C1 is 0.033uF. A high-voltage feedthrough capacitor is used.

[0028] Example 2: In some embodiments, such as Figure 2-3 As shown in the preferred embodiment of this utility model, a non-magnetic power filter for a nuclear magnetic resonance gradient power supply further includes a filter housing 1. A through-core capacitor C1 is fixedly mounted on the filter housing 1 by fasteners 2. The fasteners 2 include flat washers, spring washers, and nuts to ensure reliable fixation of the through-core capacitor C1 to the housing. An inductor L is connected to the through-core capacitor C1 by welding and fixed inside the filter housing 1. The filter housing 1 is an integral shielding structure, providing mechanical support and electromagnetic shielding protection for the internal components.

[0029] This utility model adopts an integrated power filter, which has the following outstanding advantages compared with traditional discrete or single-channel filter solutions: Magnetic weakening characteristics: This filter has magnetic weakening characteristics and uses non-magnetic fasteners, inductors, and capacitors.

[0030] High integration and compact design: The multi-channel filtering circuit is highly integrated into a single metal casing, which realizes the miniaturization and weight reduction of the equipment, saving installation space inside precision instruments such as nuclear magnetic resonance equipment that have strict space requirements.

[0031] Excellent electromagnetic compatibility (EMC) performance: Designed and tested according to international standard (IEC 60939-3), it has excellent interference suppression performance, effectively filters out common-mode and differential-mode noise on the power line, ensures the stable operation of high-sensitivity instruments such as nuclear magnetic resonance equipment, and prevents image interference and data errors.

[0032] High reliability and long lifespan: The all-metal casing (aluminum plate optional) provides excellent electromagnetic shielding and heat dissipation. Key parameters such as high insulation resistance (≥500MΩ), high test voltage (2250VDC), and high mean time between failures (MTBF: 150,000 hours @ 40℃) ensure the long-term stability and reliability of the product in harsh working environments.

[0033] Easy installation and maintenance: The integrated design simplifies the user's procurement, inventory management, and installation process. It reduces the risk of wiring errors and improves overall assembly efficiency.

[0034] Wide environmental adaptability: Wide operating temperature range (-25℃ ~ +85℃), wide humidity range (0~90%RH) and high altitude (2000m) adaptability enable it to meet the requirements of a variety of harsh industrial environments, especially the environmental characteristics of medical equipment rooms.

[0035] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A non-magnetic power supply filter for nuclear magnetic resonance gradient power supplies, characterized in that, It consists of ten identical filter branches arranged in parallel, each branch forming its own first-level filter channel. The structure of each channel is as follows: the signal enters from the input pin Ln, n=1~10, and first passes through the left-side through-hole capacitor C1. The mounting end of the left-side through-hole capacitor C1 is directly connected to the input pin Ln, and the other end of the left-side through-hole capacitor C1 serves as the output and simultaneously grounds the casing. The output end of the left-side through-hole capacitor C1 is connected in series with an inductor L. The other end of the inductor L is connected to one end of the middle through-hole capacitor C1, and the output end of the middle through-hole capacitor C1 is connected in series with another inductor L, and the middle through-hole capacitor C1 is grounded. The other end of the other inductor L is connected to one end of the right-side through-hole capacitor C1, and the output end of the right-side through-hole capacitor C1 is connected to the output pin Ln', and the right-side through-hole capacitor C1 is grounded.

2. The non-magnetic power supply filter for nuclear magnetic resonance gradient power supply according to claim 1, characterized in that, The capacitance of the inductor L is 0.5uH; a non-magnetic air-core inductor is used.

3. The non-magnetic power supply filter for nuclear magnetic resonance gradient power supply according to claim 1, characterized in that, The capacitance of the through-core capacitor C1 is 0.033uF; a high-voltage through-core capacitor is used.

4. The non-magnetic power supply filter for nuclear magnetic resonance gradient power supply according to claim 1, characterized in that, It also includes a filter housing (1), and a through-core capacitor C1 is fixedly mounted on the filter housing (1) by fasteners (2).

5. The non-magnetic power supply filter for nuclear magnetic resonance gradient power supply according to claim 4, characterized in that, Fastener (2) includes flat washers, spring washers and nuts.

6. The non-magnetic power supply filter for nuclear magnetic resonance gradient power supply according to claim 4, characterized in that, The inductor L is connected to the through-core capacitor C1 by welding and fixed inside the filter housing (1).

7. The non-magnetic power supply filter for nuclear magnetic resonance gradient power supply according to any one of claims 4 to 6, characterized in that, The filter housing (1) is made of metal.

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