Filtering mechanism

Abstract

The invention provides a filtering mechanism, which comprises a first-stage filter, a second-stage filter and a third-stage filter, the first-stage filter, the second-stage filter and the third-stage filter are connected in sequence, and a power supply flows through the first-stage filter, the second-stage filter and the third-stage filter in sequence and then flows out; wherein the first-stage filter is a harmonic filter, and the harmonic filter adopts a manganese zinc ferrite magnetic ring; the second-stage filter is a high-frequency filter, and the high-frequency filter adopts an iron powder core magnetic ring; and the third-stage filter is a low-frequency filter, and the low-frequency filter adopts an iron-silicon-aluminum magnetic ring. In other words, the filtering mechanism can improve the operation efficiency and reliability of the whole power system.

Description

Technical Field

[0001] The invention belongs to the technical field of electronic power, and more specifically, relates to a filtering mechanism. Background Art

[0002] In the field of power electronics, filtering mechanisms are important devices for reducing harmonics and noise in power supplies. However, filtering mechanisms currently on the market can often only filter out harmonics or noise within a specific frequency range, and have poor filtering effects on wide-band harmonics and noise, which cannot meet the power quality requirements of modern power electronic equipment. Summary of the invention

[0003] The present invention provides a filtering mechanism to solve the technical problems mentioned in the above background technology.

[0004] The technical solution adopted by the present invention is a filtering mechanism, including a first-stage filter, a second-stage filter and a third-stage filter, wherein the first-stage filter, the second-stage filter and the third-stage filter are connected in sequence, and the power flows out after passing through the first-stage filter, the second-stage filter and the third-stage filter in sequence; wherein,

[0005] The first-stage filter is a harmonic filter, and the harmonic filter adopts a manganese-zinc ferrite magnetic ring;

[0006] The second-stage filter is a high-frequency filter, and the high-frequency filter adopts an iron powder core magnetic ring;

[0007] The third-stage filter is a low-frequency filter, and the low-frequency filter adopts an AlSi magnetic ring.

[0008] That is to say, the filtering mechanism of the present application, through the synergistic effect of the three-stage filter formed by the first-stage filter, the second-stage filter and the third-stage filter, can effectively filter out the harmonics, high-frequency noise and low-frequency noise in the power supply, so that the harmonic content of the output power supply is greatly reduced, the power supply quality is improved, and the power equipment can operate more stably and efficiently, thereby improving the operating efficiency and reliability of the entire power system.

[0009] As a preferred embodiment of the present invention, the input end of the first-stage filter is respectively used for the three phase lines of the three-phase power supply, and the current input by each phase line is independent and flows through the first-stage filter, the second-stage filter and the third-stage filter in sequence for filtering. After filtering, the output end of the third-stage filter outputs the current through the corresponding phase lines.

[0010] As a preferred embodiment of the present invention, the input end of the first-stage filter is also used for neutral line input, and the current of the neutral line input is independent and flows through the first-stage filter, the second-stage filter and the third-stage filter in sequence for filtering. After filtering, the output end of the third-stage filter outputs the current through the corresponding neutral line.

[0011] As a preferred solution of the present invention, two first-stage filters, two second-stage filters and two third-stage filters are respectively provided, wherein one of the first-stage filters, the second-stage filters and the third-stage filters is sequentially connected to form a first filtering structure, and the other of the first-stage filters, the second-stage filters and the third-stage filters is sequentially connected to form a second filtering structure; wherein,

[0012] The input ends of the first-stage filter of the first filtering structure are respectively used for inputting three phase lines of a three-phase power supply, and the output ends of the third-stage filter of the first filtering structure output power through corresponding phase lines;

[0013] The input end of the first-stage filter of the second filtering structure is respectively used for inputting one of the phase lines and the neutral line of the three-phase power supply, and the output end of the third-stage filter of the second filtering structure outputs current through the corresponding phase line and neutral line.

[0014] As a preferred solution of the present invention, the first-stage filter, the second-stage filter and the third-stage filter of the second filtering structure are respectively connected to ground wires. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 One of the structural schematic diagrams of a filtering mechanism provided by the present invention;

[0017] Figure 2 The second structural schematic diagram of a filtering mechanism provided by the present invention. Specific embodiments

[0018] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0019] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0020] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of some inventions, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0022] See also Figure 1 The present invention provides a filtering mechanism, including a first-stage filter, a second-stage filter and a third-stage filter, wherein the first-stage filter, the second-stage filter and the third-stage filter are connected in sequence, and power flows out after passing through the first-stage filter, the second-stage filter and the third-stage filter in sequence.

[0023] Among them, the first-stage filter is a harmonic filter, and the harmonic filter uses a manganese-zinc ferrite magnetic ring; the second-stage filter is a high-frequency filter, and the high-frequency filter uses an iron powder core magnetic ring; the third-stage filter is a low-frequency filter, and the low-frequency filter uses an iron silicon aluminum magnetic ring.

[0024] Specifically, the first filter is used to filter out harmonics, the second filter is used to remove high-frequency noise, and the third filter is used to filter out low-frequency noise. In other words, after the current flows through the first filter, the second filter and the third filter in sequence, can the harmonics, high-frequency noise and low-frequency noise be eliminated in sequence? Through the synergistic effect of the first filter, the second filter and the third filter, the filtering effect can be effectively improved, making the output power purer.

[0025] It can be understood that the first-stage filter is a harmonic filter, and the harmonic filter uses a manganese-zinc ferrite magnetic ring. Specifically, the first-stage filter is mainly used to filter out harmonics of the current, especially harmonics in the range of 2-30kHz. The manganese-zinc ferrite magnetic ring has good high-frequency and low-frequency absorption characteristics, which can effectively reduce the impact of harmonics on the equipment.

[0026] The second-stage filter is a high-frequency filter, and the high-frequency filter uses an iron powder core magnetic ring. Specifically, the second-stage filter is mainly used to filter out high-frequency clutter, especially high-frequency clutter in the range of 30kHz-1MHz. The iron powder core magnetic ring has excellent high-frequency absorption characteristics, can effectively filter out high-frequency clutter, and improve the stability and quality of signal transmission.

[0027] The third-stage filter is a low-frequency filter, and the low-frequency filter uses an AlSi magnetic ring. Specifically, the third-stage filter is mainly used to filter out low-frequency clutter, especially low-frequency clutter below 1kHz. AlSi magnetic rings have good low-frequency absorption characteristics, can effectively filter out low-frequency clutter, and improve the overall performance and stability of the system.

[0028] That is to say, the filtering mechanism of the present application, through the synergistic effect of the three-stage filter formed by the first-stage filter, the second-stage filter and the third-stage filter, can effectively filter out the harmonics, high-frequency noise and low-frequency noise in the power supply, so that the harmonic content of the output power supply is greatly reduced, the power supply quality is improved, and the power equipment can operate more stably and efficiently, thereby improving the operating efficiency and reliability of the entire power system.

[0029] Further, see Figure 2 In some embodiments, the filtering mechanism can be used for the input of a three-phase power supply. For example, the input end of the first-stage filter can be used for the three phase lines of the three-phase power supply respectively. The current of each phase line is independent and flows through the first-stage filter, the second-stage filter and the third-stage filter in sequence for filtering. After filtering, the output end of the third-stage filter outputs the current through the corresponding phase line. Among them, the three phase lines can be Figure 2 Among them, phase line A, phase line B and phase line C.

[0030] Furthermore, in some embodiments, the filtering mechanism can also be used for neutral line input, for example, the input end of the first-stage filter is also used for neutral line input, the current inputted by the neutral line is independent and flows through the first-stage filter, the second-stage filter and the third-stage filter in sequence for filtering, and the output end of the third-stage filter outputs the current through the corresponding neutral line after filtering. The neutral line can be the neutral line N in the attached figure.

[0031] Of course, in some implementations, the first-stage filter, the second-stage filter, and the third-stage filter may also be connected to ground wires, respectively, as needed.

[0032] See also Figure 2 In some embodiments, in order to improve the compatibility of the filtering mechanism and enable the filtering mechanism to be compatible with multiple input modes, two first-stage filters, two second-stage filters and two third-stage filters can be respectively provided, in which one of the first-stage filters, the second-stage filters and the third-stage filters are connected in sequence to form a first filtering structure, and the other of the first-stage filters, the second-stage filters and the third-stage filters are connected in sequence to form a second filtering structure.

[0033] The input end of the first-stage filter of the first filtering structure is respectively used for inputting three phase lines of a three-phase power supply, and the output end of the third-stage filter of the first filtering structure outputs power through corresponding phase lines.

[0034] The input end of the first-stage filter of the second filtering structure is respectively used for inputting one of the phase lines and the neutral line of the three-phase power supply, and the output end of the third-stage filter of the second filtering structure outputs the current through the corresponding phase line and neutral line.

[0035] The above structure enables the filtering mechanism to be compatible with three-phase input, three-phase four-wire input, single-phase input and DC input, meeting the requirements of different application scenarios.

[0036] For example, when the filtering mechanism is used for three-phase input, phase line A, phase line B and phase line C can respectively input current through the first-stage filter of the first filtering structure. After filtering by the first filtering structure, the current is connected to phase line A, phase line B and phase line C through the output end of the third-stage filter of the first filtering structure for output.

[0037] When the filtering mechanism is used for three-phase four-wire input, phase line A, phase line B and phase line C can input current through the first filtering structure, and the neutral line N can input current through the second filtering structure.

[0038] When the filtering mechanism is used for single-phase line input, one of the phase line A, the phase line B or the phase line C can input current through the first filtering structure.

[0039] When the filtering mechanism is used for direct current input, one of the phase line A, the phase line B or the phase line C, for example the phase line C in the figure, can input current through the second filtering structure.

[0040] In addition, in some implementations, the first filter, the second filter, and the third filter of the second filtering structure may be connected to ground wires, respectively. The ground wires may be as follows: Figure 2 At this time, the filtering mechanism can realize the input of three-phase five-wire.

[0041] That is to say, the above-mentioned filtering mechanism is compatible with different input modes and has strong adaptability. Users can choose a suitable input mode according to actual conditions, thereby improving flexibility and versatility.

[0042] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of some inventions should be included in the protection scope of some inventions.

Claims

1. A filtering mechanism, characterized in that: It includes a first-stage filter, a second-stage filter and a third-stage filter, wherein the first-stage filter, the second-stage filter and the third-stage filter are connected in sequence, and the power flows out after passing through the first-stage filter, the second-stage filter and the third-stage filter in sequence; wherein, The first-stage filter is a harmonic filter, and the harmonic filter adopts a manganese-zinc ferrite magnetic ring; The second-stage filter is a high-frequency filter, and the high-frequency filter adopts an iron powder core magnetic ring; The third-stage filter is a low-frequency filter, and the low-frequency filter adopts an AlSi magnetic ring.

2. The filtering mechanism according to claim 1, characterized in that: The input end of the first-stage filter is respectively used for the three phase lines of the three-phase power supply. The current input to each phase line is independent and flows through the first-stage filter, the second-stage filter and the third-stage filter in sequence for filtering. After filtering, the output end of the third-stage filter outputs the current through the corresponding phase lines.

3. The filtering mechanism according to claim 2, characterized in that: The input end of the first-stage filter is also used for neutral line input. The current of the neutral line input is independent and flows through the first-stage filter, the second-stage filter and the third-stage filter in sequence for filtering. After filtering, the output end of the third-stage filter outputs the current through the corresponding neutral line.

4. The filtering mechanism according to claim 3, characterized in that: The first-stage filter, the second-stage filter and the third-stage filter are each provided with two, wherein the first-stage filter, the second-stage filter and the third-stage filter are connected in sequence to form a first filtering structure in one, and the first-stage filter, the second-stage filter and the third-stage filter are connected in sequence to form a second filtering structure in the other; wherein, The input ends of the first-stage filter of the first filtering structure are respectively used for inputting three phase lines of a three-phase power supply, and the output ends of the third-stage filter of the first filtering structure output power through corresponding phase lines; The input end of the first-stage filter of the second filtering structure is respectively used for inputting one of the phase lines and the neutral line of the three-phase power supply, and the output end of the third-stage filter of the second filtering structure outputs current through the corresponding phase line and neutral line.

5. The filtering mechanism according to claim 3, characterized in that: The first-stage filter, the second-stage filter and the third-stage filter of the second filtering structure are respectively connected to ground wires.

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