CN1399389A - Passive filtering method and passive filter circuit - Google Patents
Passive filtering method and passive filter circuit Download PDFInfo
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- CN1399389A CN1399389A CN02136533A CN02136533A CN1399389A CN 1399389 A CN1399389 A CN 1399389A CN 02136533 A CN02136533 A CN 02136533A CN 02136533 A CN02136533 A CN 02136533A CN 1399389 A CN1399389 A CN 1399389A
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Abstract
The passive filtering method and passive filter circuit features that via the monophase or triphase power source of the power network, transformer(s), fundamental wave current serial resonance circuit or harmonic wave current parallel resonance circuit and harmonic wave current resonance circuit of filter combination, two loop are constituted. Compared with available technology, the present invention has the advantages of simple control without complicated harmonic current calculation, strong inhibition capacity to the harmonic current the load injects to the power network, avoiding the resonance between the power network system and the filter, and excellent adaptability to unbalanced running of power network. The present invention can be used widely in power network needing harmonic compensation.
Description
Technical field
The present invention relates to a kind of device that reduces harmonic wave, particularly a kind of passive filtering method and filter circuit thereof.
Background technology
Along with the extensive use of non-linear electric load, the mains by harmonics electric current pollutes also serious day by day.The existence of harmonic wave has serious harm, as the electric energy loss of increase system, circuit and equipment; Reduce the utilance of electrical source power factor and power system capacity; The fail safe of power system operation descends or the like.Therefore harmonic wave and governing problem thereof have caused national governments, have ground the great attention of educational circles and industrial circle.The improvement of harmonic wave at present has dual mode: 1) active improvement makes each user load not produce current harmonics.2) passive type is administered, and promptly each user load can produce harmonic current, but is absorbed by some harmonic wave absorption plants, and the excessive harmonic current that surpasses related standards with restriction injects electrical network.The present invention relates to passive type mains by harmonics electric current administers.
Passive type mains by harmonics electric current is administered technology two kinds of main modes at present: (1) is simple passive filter group in parallel on electrical network, this kind mode major defect is: passive filter group in parallel may and electrical network between resonance takes place, reduced the network system reliability of operation.(2) active power filter on serial or parallel connection on the electrical network or mixing connection, this kind mode characteristics are to detect harmonic current or the harmonic voltage that load produces earlier, utilize power electronic device to produce harmonic current or the harmonic current of harmonic voltage counteracting load generation or the influence of harmonic voltage proportional again with this curtage, make the harmonic current that flows into electrical network reach minimum, the major defect of this kind mode is: quite control is complicated, and the reliability of device is low.
Summary of the invention
The present invention proposes a kind of scheme that relates to the passive filtering of passive type mains by harmonics electric current improvement.Can stop the load harmonic current to inject electrical network, can suppress the high-performance of electrical network resonance, the harmonic filter circuit of high reliability again, to improve the reliability and the ratio of performance to price of filter.
Fig. 1 be of the present invention passive single-phase/or three-phase filter circuit block diagram, mark 1 is single-phase/or three phase network power supply among the figure, 2 is transformer/or transformer group, 3 is fundamental current series resonant circuit/or Xie Bo Dian Liu And connection resonant circuit, 4 for And is connected on harmonic current resonant circuit on the electrical network loop/or bank of filters of being made up of a plurality of filters, and 5 is nonlinear load.
A kind of passive filtering method, comprise single-phase/or the loop of three phase network power supply 1, nonlinear load 5 is characterized in that: by transformer/or transformer group 2 is set in the loop of electric network source 1, the fundamental current series resonant circuit/or Xie Bo Dian Liu And connection resonant circuit 3, the harmonic current resonant circuit/or bank of filters 4, with transformer/or the former limit of transformer group 2 be serially connected in single-phase/or the loop of three phase network power supply 1 in, its secondary and fundamental current series resonant circuit/or Xie Bo Dian Liu And connection resonant circuit 3 be connected in series the formation loop, with the harmonic current resonant circuit/or bank of filters 4 And be connected on transformer/or transformer group 2 the right power network lines on; By in the loop of electric network source 1, setting up transformer/or transformer group 6, fundamental current series resonant circuit/or Xie Bo Dian Liu And connection resonant circuit 7, transformer/or the former limit of transformer group 6 and fundamental current series resonant circuit/or Xie Bo Dian Liu And connection resonant circuit 3, transformer/or the secondary of transformer group 2 form the loop, its secondary and fundamental current series resonant circuit/or Xie Bo Dian Liu And connection resonant circuit 7 formation loops.
A kind of passive single-phase filter circuit, comprise single-phase electricity network source 1, nonlinear load 5, it is characterized in that: in the loop of single-phase electricity network source 1, be provided with transformer 2, the fundamental current series resonant circuit of forming by reactor L1 and capacitor C1 3, the harmonic current resonant circuit of forming by reactor L2～L4 and capacitor C2～C4 4, wherein the former limit of transformer 2 is serially connected in the loop of single-phase electricity network source 1, its secondary and fundamental current series resonant circuit 3 are connected to form series loop, and power network line Shang And connects harmonic current resonant circuit 4 and nonlinear load 5 on the right of transformer 2.As shown in Figure 2.
A kind of passive single-phase filter circuit, comprise single-phase electricity network source 1, nonlinear load 5, it is characterized in that: in the loop of single-phase electricity network source 1, be provided with transformer 2, the Xie Bo Dian Liu And that is made up of reactor L1 and capacitor C1 joins resonant circuit 3, the harmonic current resonant circuit of forming by reactor L2～L4 and capacitor C2～C4 4, wherein the former limit of transformer 2 is serially connected in the loop of single-phase electricity network source 1, its secondary and Xie Bo Dian Liu And connection resonant circuit 3 are connected to form series loop, and power network line Shang And connects harmonic current resonant circuit 4 and nonlinear load 5 on the right of transformer 2.As shown in Figure 3.
A kind of passive single-phase filter circuit, comprise single-phase electricity network source 1, nonlinear load 5, it is characterized in that: in the loop of single-phase electricity network source 1, be provided with transformer 2, the fundamental current series resonant circuit of forming by reactor L1 and capacitor C1 3, the harmonic current resonant circuit of forming by reactor L2～L4 and capacitor C2～C4 4, transformer 6, form Xie Bo Dian Liu And connection resonant circuit 7 by reactor L5 and capacitor C5, wherein the former limit of transformer 2 is serially connected in the loop of single-phase electricity network source 1, the former limit of its secondary and fundamental current series resonant circuit 3 and transformer 6 is connected to form series loop, the secondary of transformer 6 and Xie Bo Dian Liu And connection resonant circuit 7 form the loop, and power network line Shang And connects harmonic current resonant circuit 4 and nonlinear load 5 on the right of transformer 2.As shown in Figure 4.
A kind of passive single-phase filter circuit, comprise single-phase electricity network source 1, nonlinear load 5, it is characterized in that: in the loop of single-phase electricity network source 1, be provided with transformer 2, the fundamental current series resonant circuit of forming by reactor L1 and capacitor C1 3, the harmonic current resonant circuit of forming by reactor L2～L4 and capacitor C2～C4 4, transformer 6, form fundamental current series resonant circuit 7 by reactor L5 and capacitor C5, wherein the former limit of transformer 2 is serially connected in the loop of single-phase electricity network source 1, the former limit of its secondary and fundamental current series resonant circuit 3 and transformer 6 is connected to form series loop, the secondary of transformer 6 and fundamental current series resonant circuit 7 form the loop, and power network line Shang And connects harmonic current resonant circuit 4 and nonlinear load 5 on the right of transformer 2.As shown in Figure 5.
A kind of passive three-phase filter circuit, comprise three phase network power supply 1, nonlinear load 5, it is characterized in that: in the loop of three phase network power supply 1, be provided with the transformer group of forming by transformer 2a～2c 2, the fundamental current series resonant circuit of forming by reactor L1～L3 and capacitor C1～C3 3, the Three-phase electric-wave filter group of forming by filter 4a～4c 4, the former limit of transformer 2a～2c is serially connected in respectively in every phase loop of three phase network power supply 1, its secondary respectively with fundamental current series resonant circuit 3 in reactor L1～L3 and each self-forming series loop of capacitor C1～C3 of being connected in series, bank of filters 4 And are connected on the three phase network loop on transformer group 2 the right.As shown in Figure 6.
A kind of passive three-phase filter circuit, comprise three phase network power supply 1, nonlinear load 5, it is characterized in that: in the loop of three phase network power supply 1, be provided with the transformer group of forming by transformer 2a～2c 2, the Xie Bo Dian Liu And that is made up of reactor L1～L3 and capacitor C1～C3 joins resonant circuit 3, the Three-phase electric-wave filter group of forming by filter 4a～4c 4, the former limit of transformer 2a～2c is serially connected in respectively in every phase loop of three phase network power supply 1, its secondary joins reactor L1～L3 and each self-forming And connection loop of capacitor C1～C3 that And connects in the resonant circuit 3 with humorous ripple electricity stream And respectively, and bank of filters 4 And are connected on the three phase network loop on transformer group 2 right sides.As shown in Figure 7.
A kind of passive three-phase filter circuit, comprise three phase network power supply 1, nonlinear load 5, it is characterized in that: in the loop of three phase network power supply 1, be provided with the transformer group of forming by transformer 2a～2c 2, the fundamental current series resonant circuit of forming by reactor L1～L3 and capacitor C1～C3 3, the bank of filters of forming by filter 4a～4c 4, the transformer group of forming by transformer 6a～6c 6, the Xie Bo Dian Liu And that is made up of reactor L4～L6 and capacitor C4～C6 joins resonant circuit 7, the former limit of transformer 2a～2c is serially connected in respectively in every phase loop of three phase network power supply 1, its secondary respectively with reactor L1～L3, capacitor C1～C3, the former limit of transformer 6a～6c serial connection forms each self-loop, the secondary of transformer 6a～6c joins loop with reactor L4～L6 and each self-forming And of capacitor C4～C6 respectively, and bank of filters 4 And are connected on the three phase network loop on transformer group 2 right sides.As shown in Figure 8.
A kind of passive three-phase filter circuit, comprise three phase network power supply 1, nonlinear load 5, it is characterized in that: in the loop of three phase network power supply 1, be provided with the transformer group of forming by transformer 2a～2c 2, the fundamental current series resonant circuit of forming by reactor L1～L3 and capacitor C1～C3 3, the bank of filters of forming by filter 4a～4c 4, the transformer group of forming by transformer 6a～6c 6, the fundamental current series resonant circuit of forming by reactor L4～L6 and capacitor C4～C6 7, the former limit of transformer 2a～2c is serially connected in respectively in every phase loop of three phase network power supply 1, its secondary respectively with reactor L1～L3, capacitor C1～C3, the former limit of transformer 6a～6G serial connection forms each self-loop, the secondary of transformer 6a～6c is connected in series each self-forming loop with reactor L4～L6 and capacitor C4～C6 respectively, and bank of filters 4 And are connected on the three phase network loop on transformer group 2 right sides.As shown in Figure 9.
In foregoing circuit, each transformer 2a～2c and 6a～6c in transformer 2,6 or the transformer group, former limit or secondary Ke And connecting resistance, variable resistor, protection switch, or and combination; Can transformer/or the power network line on transformer group 2 the right on increase or reduce harmonic current resonant circuit branch road/or the number of filter is set; When nonlinear load 5 during for harmonic voltage source ， Bu And connect harmonic current resonant circuit/or bank of filters.
Transformer in the above-mentioned passive filter circuit, fundamental current series resonant circuit, the formed circuit of Xie Bo Dian Liu And connection resonant circuit, can stop nonlinear load on electrical network, to form the harmonic current that exceeds standard effectively, also stop the harmonic current of grid side to inject load, also stoped the harmonic voltage of grid side in load, to form the harmonic current that exceeds standard simultaneously.Passive filter circuit of the present invention is suitable at single-phase electrical network, three phase network, reaches on the three-phase four-wire system electrical network and use.
With prior art relatively, outstanding advantage of the present invention is: (1) control is simple, has omitted complicated harmonic current and has calculated, and has increased the reliability of filter circuit work; (2) harmonic current that injects electrical network from load there is very strong inhibition ability; (3) can stop contingent resonance between network system and the filter, increase the reliability of operation of power networks; (4) unbalanced operation to three phase network has good adaptive capacity.Can be widely used in to carry out on the electrical network of current harmonics compensation.
Description of drawings
Fig. 1 is the passive filter circuit block diagram.
Fig. 2 is a kind of passive single-phase filter circuit schematic diagram.
Fig. 3 is a kind of passive single-phase filter circuit schematic diagram.
Fig. 4 is a kind of passive single-phase filter circuit schematic diagram.
Fig. 5 is a kind of passive single-phase filter circuit schematic diagram.
Fig. 6 is a kind of passive three-phase filter circuit schematic diagram.
Fig. 7 is a kind of passive three-phase filter circuit schematic diagram.
Fig. 8 is a kind of passive three-phase filter circuit schematic diagram.
Fig. 9 is a kind of passive three-phase filter circuit schematic diagram.
Embodiment
Embodiment 1:
A kind of passive single-phase filter circuit of high-performance that is used for electric locomotive, as shown in Figure 2.Transformer 2 is 800 kilovolt-amperes, and reactor L1 is 200 milihenries, and L2 is 20.7 milihenries, and L3 is 13.5 milihenries, L4 is 2.79 milihenries, the inductance quality factor q 1=Q2=Q3=30 of L1, L2, L3, and capacitor C1 is 50.7 microfarads, C2 is 10 microfarads, and C3 is 30 microfarads, and C4 is 30 microfarads.
Embodiment 2:
A kind of passive three-phase filter circuit that is used for rolling mill, as shown in Figure 6.Transformer 2a is 800 kilovolt-amperes, and 2b is 800 kilovolt-amperes, and 2c is 800 kilovolt-amperes, reactor L1=L2=L3=200 milihenry, the inductance quality factor q 1=Q2=Q3=30 of L1, L2, L3, capacitor C1=C2=C3=50.7 microfarad.The parameter of filter 4a: the inductance value of every phase inductance is 20.7 milihenries, and the quality factor of every phase inductance are 30, and the capacity of every phase electric capacity is 10 microfarads; The parameter of filter 4b: the inductance value of every phase inductance is 13.5 milihenries, and the quality factor of every phase inductance are 30, and the capacity of every phase electric capacity is 30 microfarads; The parameter of filter 4c: the inductance value of every phase inductance is 2.79 milihenries, and the quality factor of every phase inductance are 30, and the capacity of every phase electric capacity is 30 microfarads.
Claims (13)
1. passive filtering method, comprise single-phase/or the loop of three phase network power supply (1), nonlinear load (5), it is characterized in that: by transformer/or transformer group (2) is set in the loop of electric network source (1), the fundamental current series resonant circuit/or Xie Bo Dian Liu And connection resonant circuit (3), the harmonic current resonant circuit/or bank of filters (4), with transformer/or the former limit of transformer group (2) be serially connected in single-phase/or the loop of three phase network power supply (1) in, its secondary and fundamental current series resonant circuit/or Xie Bo Dian Liu And connection resonant circuit (3) be connected in series and forms the loop, with the harmonic current resonant circuit/or bank of filters (4) And be connected on transformer/or transformer group (2) on the right of on the power network line.
2. method according to claim 1, it is characterized in that: by in the loop of electric network source (1), setting up transformer/or transformer group (6), fundamental current series resonant circuit/or Xie Bo Dian Liu And connection resonant circuit (7), transformer/or the former limit of transformer group (6) and fundamental current series resonant circuit/or Xie Bo Dian Liu And connection resonant circuit (3), transformer/or the secondary of transformer group (2) form the loop, its secondary and fundamental current series resonant circuit/or Xie Bo Dian Liu And connection resonant circuit (7) formation loop.
3. passive single-phase filter circuit, comprise single-phase electricity network source (1), nonlinear load (5), it is characterized in that: in the loop of single-phase electricity network source (1), be provided with transformer (2), the fundamental current series resonant circuit of forming by reactor (L1) and capacitor (C1) (3), by reactor (L2～L4) and capacitor (the harmonic current resonant circuit (4) of C2～C4) form, wherein the former limit of transformer (2) is serially connected in the loop of single-phase electricity network source (1), its secondary and fundamental current series resonant circuit (3) are connected to form series loop, connect harmonic current resonant circuit (4) and nonlinear load (5) at the right of transformer (2) power network line Shang And.
4. passive single-phase filter circuit, comprise single-phase electricity network source (1), nonlinear load (5), it is characterized in that: in the loop of single-phase electricity network source (1), be provided with transformer (2), the Xie Bo Dian Liu And that is made up of reactor (L1) and capacitor (C1) joins resonant circuit (3), by reactor (L2～L4) and capacitor (the harmonic current resonant circuit (4) of C2～C4) form, wherein the former limit of transformer (2) is serially connected in the loop of single-phase electricity network source (1), its secondary and Xie Bo Dian Liu And connection resonant circuit (3) are connected to form series loop, connect harmonic current resonant circuit (4) and nonlinear load (5) at the right of transformer (2) power network line Shang And.
5. passive single-phase filter circuit, comprise single-phase electricity network source (1), nonlinear load (5), it is characterized in that: in the loop of single-phase electricity network source (1), be provided with transformer (2), the fundamental current series resonant circuit of forming by reactor (L1) and capacitor (C1) (3), by reactor (L2～L4) and capacitor (the harmonic current resonant circuit (4) of C2～C4) form, transformer (6), form Xie Bo Dian Liu And connection resonant circuit (7) by reactor (L5) and capacitor (C5), wherein the former limit of transformer (2) is serially connected in the loop of single-phase electricity network source (1), the former limit of its secondary and fundamental current series resonant circuit (3) and transformer (6) is connected to form series loop, the secondary of transformer (6) and Xie Bo Dian Liu And connection resonant circuit (7) form the loop, connect harmonic current resonant circuit (4) and nonlinear load (5) at the right of transformer (2) power network line Shang And.
6. passive single-phase filter circuit, comprise single-phase electricity network source (1), nonlinear load (5), it is characterized in that: in the loop of single-phase electricity network source (1), be provided with transformer (2), the fundamental current series resonant circuit of forming by reactor (L1) and capacitor (C1) (3), by reactor (L2～L4) and capacitor (the harmonic current resonant circuit (4) of C2～C4) form, transformer (6), form fundamental current series resonant circuit (7) by reactor (L5) and capacitor (C5), wherein the former limit of transformer (2) is serially connected in the loop of single-phase electricity network source (1), the former limit of its secondary and fundamental current series resonant circuit (3) and transformer (6) is connected to form series loop, the secondary of transformer (6) and fundamental current series resonant circuit (7) form the loop, connect harmonic current resonant circuit (4) and nonlinear load (5) at the right of transformer (2) power network line Shang And.
7. passive three-phase filter circuit, comprise three phase network power supply (1), nonlinear load (5), it is characterized in that: in the loop of three phase network power supply (1), be provided with the transformer (transformer group (2) that 2a～2c) forms, by reactor (L1～L3) and capacitor (the fundamental current series resonant circuit (3) of C1～C3) form, by filter (the Three-phase electric-wave filter group (4) of 4a～4c) form, (the former limit of 2a～2c) is serially connected in respectively in every phase loop of three phase network power supply (1) transformer, its secondary respectively with fundamental current series resonant circuit (3) in the reactor that be connected in series ((C1～C3) formation series loop, (4) And are connected on the three phase network loop on the right of the transformer group (2) bank of filters for L1～L3) and capacitor.
8. passive three-phase filter circuit, comprise three phase network power supply (1), nonlinear load (5), it is characterized in that: in the loop of three phase network power supply (1), be provided with by the transformer (transformer group (2) of 2a～2c) form, by reactor (L1～L3) and capacitor (the Xie Bo Dian Liu And connection resonant circuit (3) of C1～C3) form, by filter (the Three-phase electric-wave filter group (4) of 4a～4c) form, (the former limit of 2a～2c) is serially connected in respectively in every phase loop of three phase network power supply (1) transformer, its secondary respectively with humorous ripple electricity stream And connection resonant circuit (3) in the reactor that connects of And ((C1～C3) each self-forming And joins loop, and bank of filters (4) And is connected on the three phase network loop on transformer group (2) right side for L1～C3) and capacitor.
9. passive three-phase filter circuit, comprise three phase network power supply (1), nonlinear load (5), it is characterized in that: in the loop of three phase network power supply (1), be provided with by the transformer (transformer group (2) of 2a～2c) form, by reactor (L1～L3) and capacitor (the fundamental current series resonant circuit (3) of C1～C3) form, by the filter (bank of filters (4) of 4a～4c) form, by the transformer (transformer group (6) of 6a～6c) form, by reactor (L4～L6) and capacitor (the Xie Bo Dian Liu And connection resonant circuit (7) of C4～C6) form, (the former limit of 2a～2c) is serially connected in respectively in every phase loop of three phase network power supply (1) transformer, its secondary respectively with reactor (L1～L3), capacitor (C1～C3), (6a～6c) former limit is connected in series and forms each self-loop transformer, (((each self-forming And connection loop of C4～C6), bank of filters (4) And is connected on the three phase network loop on transformer group (2) right side the secondary of 6a～6c) transformer for L4～L6) and capacitor with reactor respectively.
10. passive three-phase filter circuit, comprise three phase network power supply (1), nonlinear load (5), it is characterized in that: in the loop of three phase network power supply (1), be provided with the transformer (transformer group (2) that 2a～2c) forms, by reactor (L1～L3) and capacitor (the fundamental current series resonant circuit (3) of C1～C3) form, by the filter (bank of filters (4) of 4a～4c) form, by the transformer (transformer group (6) of 6a～6c) form, by reactor (L4～L6) and capacitor (the fundamental current series resonant circuit (7) of C4～C6) form, (the former limit of 2a～2c) is serially connected in respectively in every phase loop of three phase network power supply (1) transformer, its secondary respectively with reactor (L1～L3), capacitor (C1～C3), (6a～6c) former limit forms each self-loop to transformer, (((C4～C6) each self-forming series loop, bank of filters (4) And is connected on the three phase network loop on transformer group (2) right side the secondary of 6a～6c) transformer for L4～L6) and capacitor with reactor respectively.
11. according to described any filter circuit of claim 3-10; it is characterized in that: each transformer (2a～2c and 6a～6c in transformer (2 and 6) or the transformer group;) former limit or secondary Ke And connecting resistance, variable resistor, protection switch, or and combination.
12., it is characterized in that according to described any filter circuit of claim 3-10: can transformer/or the power network line on transformer group (2) the right on increase or reduce harmonic current resonant circuit branch road/or the number of filter is set.
13., it is characterized in that: when nonlinear load (5) ， Bu And when the harmonic voltage source connects harmonic current resonant circuit/or bank of filters (4) according to described any filter circuit of claim 3-10.
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| CN02136533A CN1399389A (en) | 2002-08-14 | 2002-08-14 | Passive filtering method and passive filter circuit |
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| CN02136533A CN1399389A (en) | 2002-08-14 | 2002-08-14 | Passive filtering method and passive filter circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102427232A (en) * | 2008-07-25 | 2012-04-25 | 武汉大学 | Multi-harmonic source harmonic isolation device |
| CN108551254A (en) * | 2018-06-24 | 2018-09-18 | 上海圣缑电磁设备有限公司 | Straightening and filtering unit and its computational methods of CLARK transformation |
| CN109390944A (en) * | 2017-08-04 | 2019-02-26 | 中车大同电力机车有限公司 | A kind of optimization method of AC transmission electric power locomotive primary side harmonic performance |
| CN110113065A (en) * | 2019-05-05 | 2019-08-09 | Oppo广东移动通信有限公司 | The antenna assembly and electronic equipment of electronic equipment |
| CN112383062A (en) * | 2020-12-17 | 2021-02-19 | 哈尔滨理工大学 | Automatic tuning structure of passive power filter |
-
2002
- 2002-08-14 CN CN02136533A patent/CN1399389A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102427232A (en) * | 2008-07-25 | 2012-04-25 | 武汉大学 | Multi-harmonic source harmonic isolation device |
| CN109390944A (en) * | 2017-08-04 | 2019-02-26 | 中车大同电力机车有限公司 | A kind of optimization method of AC transmission electric power locomotive primary side harmonic performance |
| CN109390944B (en) * | 2017-08-04 | 2022-04-12 | 中车大同电力机车有限公司 | Optimization method for primary harmonic performance of alternating-current transmission electric locomotive |
| CN108551254A (en) * | 2018-06-24 | 2018-09-18 | 上海圣缑电磁设备有限公司 | Straightening and filtering unit and its computational methods of CLARK transformation |
| CN108551254B (en) * | 2018-06-24 | 2024-01-23 | 上海圣缑电磁设备有限公司 | Rectifying and filtering device and calculation method of CLARK conversion thereof |
| CN110113065A (en) * | 2019-05-05 | 2019-08-09 | Oppo广东移动通信有限公司 | The antenna assembly and electronic equipment of electronic equipment |
| CN112383062A (en) * | 2020-12-17 | 2021-02-19 | 哈尔滨理工大学 | Automatic tuning structure of passive power filter |
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