CN210246320U - Three-phase four-wire power filter - Google Patents
Three-phase four-wire power filter Download PDFInfo
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- CN210246320U CN210246320U CN201921041788.5U CN201921041788U CN210246320U CN 210246320 U CN210246320 U CN 210246320U CN 201921041788 U CN201921041788 U CN 201921041788U CN 210246320 U CN210246320 U CN 210246320U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
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Abstract
The utility model provides a three-phase four-wire power filter, which comprises a phase line, a three-phase power input end and a three-phase current output end; the low-frequency common-mode inductor and the high-frequency common-mode inductor are respectively connected between a three-phase power input end and a three-phase current output end in series, the first differential-mode capacitor assembly is arranged between the three-phase power input end and the low-frequency common-mode inductor, the second differential-mode capacitor assembly is arranged between the low-frequency common-mode inductor and the high-frequency common-mode inductor, the first common-mode capacitor assembly is arranged between the low-frequency common-mode inductor and the high-frequency common-mode inductor, and the second common-mode capacitor assembly is arranged between the high-frequency common-mode inductor and the three-phase current output end. The utility model provides a three-phase four-wire power filter can realize the high insertion loss in wide band range, can fully restrain the electromagnetic interference of circuit.
Description
Technical Field
The utility model belongs to the technical field of the wave filter, more specifically say, relate to a three-phase four-wire power filter.
Background
With the rapid development of electronic technology and microelectronic circuits, various electronic devices form a complex Electromagnetic environment, so that the attention degree of users to the problem of Electromagnetic compatibility of products is continuously increased, and a large amount of power supply EMI (Electromagnetic Interference) filters are used in the whole machine and system, and the frequency spectrum of signals of the power supply EMI filters is very wide.
The existing power supply EMI filter usually adopts a single-stage filter circuit, and because the materials of the used inductor have a plurality of specifications and the filter frequency bands aimed at by different magnetic materials are different, the existing power supply EMI filter cannot realize high insertion loss in a wide frequency range and cannot meet the requirements of military equipment.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a three-phase four-wire power filter to solve the technical problem that can't realize the high insertion loss in wide band range that exists among the prior art.
In order to achieve the above object, the utility model adopts the following technical scheme: the three-phase four-wire power supply filter comprises a phase line, a three-phase power supply input end and a three-phase current output end, wherein the three-phase power supply input end and the three-phase current output end are respectively connected to two ends of the phase line; the method is characterized in that: the low-frequency common mode inductor, the high-frequency common mode inductor, the first differential mode capacitor assembly, the second differential mode capacitor assembly, the first common mode capacitor assembly and the second common mode capacitor assembly are respectively arranged in the shell, the low-frequency common mode inductor and the high-frequency common mode inductor are respectively connected in series between the three-phase power input end and the three-phase current output end, the first differential mode capacitor assembly is arranged between the three-phase power input end and the low-frequency common mode inductor, the second differential mode capacitor assembly is arranged between the low-frequency common mode inductor and the high-frequency common mode inductor, and the first common mode capacitor assembly is arranged between the low-frequency common mode inductor and the high-frequency common mode inductor, the second common mode capacitor assembly is arranged between the high-frequency common mode inductor and the three-phase current output end.
Further, the three-phase four-wire power filter further includes a neutral line, a neutral line input end and a neutral line output end, where the neutral line input end and the neutral line output end are respectively connected to two ends of the neutral line, the phase line includes a first phase line, a second phase line and a third phase line, the three-phase power input end includes a first phase input end, a second phase input end and a third phase input end, the three-phase current output end includes a first phase output end, a second phase output end and a third phase output end, the first phase input end and the first phase output end are respectively connected to two ends of the first phase line, the second phase input end and the second phase output end are respectively connected to two ends of the second phase line, and the third phase input end and the third phase output end are respectively connected to two ends;
the low-frequency common-mode inductor comprises a low-frequency magnetic ring, and a first inductance coil, a second inductance coil, a third inductance coil and a fourth inductance coil which are wound on the low-frequency magnetic ring at intervals, wherein the first inductance coil is connected between the first phase input end and the first phase output end, the second inductance coil is connected between the second phase input end and the second phase output end, the third inductance coil is connected between the third phase input end and the third phase output end, and the fourth inductance coil is connected between the neutral line input end and the neutral line output end;
the high-frequency common-mode inductor comprises a high-frequency magnetic ring, and fifth, sixth, seventh and eighth inductance coils wound on the high-frequency magnetic ring at intervals, the fourth inductance coil is connected between the first phase input end and the first phase output end, the fifth inductance coil is connected between the second phase input end and the second phase output end, the sixth inductance coil is connected between the third phase input end and the third phase output end, and the seventh inductance coil is connected between the neutral line input end and the neutral line output end.
Further, the low-frequency magnetic ring is an amorphous magnetic ring, and the high-frequency magnetic ring is a manganese-zinc ferrite magnetic ring.
Furthermore, a cross-shaped clapboard is arranged in the low-frequency magnetic ring and/or the high-frequency magnetic ring,
the cross-shaped partition board in the low-frequency magnetic ring is used for isolating the first inductance coil, the second inductance coil, the third inductance coil and the fourth inductance coil from each other;
the cross-shaped partition board in the high-frequency magnetic ring is used for isolating the fifth inductance coil, the sixth inductance coil, the seventh inductance coil and the eighth inductance coil from each other.
Further, the first differential-mode capacitor assembly includes a first capacitor, a second capacitor and a third capacitor, the first capacitor is connected between the first phase line and the neutral line, the second capacitor is connected between the second phase line and the neutral line, and the third capacitor is connected between the third phase line and the neutral line.
Further, the first differential-mode capacitor assembly further comprises a first resistor, a second resistor and a third resistor, the first resistor is connected to two ends of the first capacitor in parallel, the second resistor is connected to two ends of the second capacitor in parallel, and the third resistor is connected to two ends of the third resistor in parallel.
Further, the second differential-mode capacitor assembly includes a fourth capacitor, a fifth capacitor and a sixth capacitor, the fourth capacitor is connected between the first phase line and the neutral line, the fifth capacitor is connected between the second phase line and the neutral line, and the sixth capacitor is connected between the third phase line and the neutral line.
Further, the three-phase four-wire power filter further includes a ground wire, the first common-mode capacitor component includes a seventh capacitor, an eighth capacitor, a ninth capacitor and a tenth capacitor, the seventh capacitor is connected between the first phase line and the ground wire, the eighth capacitor is connected between the second phase line and the ground wire, the ninth capacitor is connected between the third phase line and the ground wire, and the tenth capacitor is connected between the neutral line and the ground wire.
Further, the second common-mode capacitor assembly includes an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor and a fourteenth capacitor, the eleventh capacitor is connected between the first phase line and the ground line, the twelfth capacitor is connected between the second phase line and the ground line, the thirteenth capacitor is connected between the third phase line and the ground line, and the fourteenth capacitor is connected between the neutral line and the ground line.
Further, heat-conducting silica gel is filled in the shell.
The utility model provides a three-phase four-wire power filter's beneficial effect lies in: compared with the prior art, the three-phase four-wire power filter of the utility model can realize high insertion loss in a wide frequency range and meet the requirements of military equipment by respectively connecting the low-frequency common-mode inductor and the high-frequency common-mode inductor with different frequency characteristics in series between the three-phase power input end and the three-phase current output end to form two-stage filtering, and can enable the low-frequency common-mode inductor, the first differential-mode capacitor component and the second differential-mode capacitor component to form a pi-type differential-mode symmetrical circuit structure by arranging the first differential-mode capacitor component between the three-phase power input end and the low-frequency common-mode inductor, the second differential-mode capacitor component between the low-frequency common-mode inductor and the high-frequency common-mode inductor, the first common-mode capacitor component between the low-frequency common-mode inductor and the high-frequency common-mode inductor, and the second common, the high-frequency common-mode inductor, the first common-mode capacitor assembly and the second common-mode capacitor assembly form a pi-type common-mode symmetrical circuit structure, so that electromagnetic interference of a circuit can be fully inhibited.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a schematic diagram of an internal structure of a three-phase four-wire power filter according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a low-frequency common mode inductor or a high-frequency common mode inductor of a three-phase four-wire power filter according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram provided in an embodiment of the present invention;
fig. 4 is a common-mode insertion loss test curve chart under the load impedance 50 Ω standard according to an embodiment of the present invention;
fig. 5 is a graph illustrating a differential mode insertion loss test under a load impedance 50 Ω standard according to an embodiment of the present invention;
fig. 6 is a schematic wiring diagram of a fifth circuit board according to an embodiment of the present invention.
Wherein, in the figures, the respective reference numerals:
1-a shell; 3-three-phase power input end; 4-three-phase current output end; 51-a first differential mode capacitance component; 511-a first circuit board; 52-a second differential mode capacitance component; 521-a second circuit board; 61-a first common mode capacitive component; 611-a third circuit board; 62-a second common mode capacitance component; 621-a fourth circuit board; 7-low frequency common mode inductance; 71-a low frequency magnetic ring; 72-first inductor winding; 73-a second inductor winding; 74-a third inductor winding; 75-a fourth inductor winding; 8-high frequency common mode inductance; 81-high frequency magnetic ring; 82-fifth inductor winding; 83-sixth inductor winding; 84-seventh inductor winding; 85-eighth inductor winding; 9-a fifth circuit board; 91-enameled wire; 92-an insulating sleeve; 10-cross partition plate.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be 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 be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
Referring to fig. 1 to 5, a three-phase four-wire power filter according to the present invention will be described. The utility model provides a three-phase four-wire power filter, including the phase line, connect three-phase power input 3 and three-phase current output 4 at the phase line both ends respectively. The low-frequency common-mode inductor 7, the high-frequency common-mode inductor 8, the first differential-mode capacitor assembly 51, the second differential-mode capacitor assembly 52, the first common-mode capacitor assembly 61 and the second common-mode capacitor assembly 62 are further included. The low-frequency common mode inductor 7, the high-frequency common mode inductor 8, the first differential mode capacitor element 51, the second differential mode capacitor element 52, the first common mode capacitor element 61, and the second common mode capacitor element 62 are respectively disposed in the housing 1. The low-frequency common mode inductor 7 and the high-frequency common mode inductor 8 are respectively connected in series between the three-phase power input end 3 and the three-phase current output end 4, the first differential mode capacitor assembly 51 is arranged between the three-phase power input end 3 and the low-frequency common mode inductor 7, and the second differential mode capacitor assembly 52 is arranged between the low-frequency common mode inductor 7 and the high-frequency common mode inductor 8. The first common mode capacitor element 61 is disposed between the low frequency common mode inductor 7 and the high frequency common mode inductor 8. The second common mode capacitor assembly 62 is disposed between the high frequency common mode inductor 8 and the three phase current output terminal 4.
The low-frequency common mode inductor 7 has good low-frequency characteristics, the high-frequency common mode inductor 8 has good high-frequency characteristics, the low-frequency common mode inductor 7 and the high-frequency common mode inductor 8 with different frequency characteristics are respectively connected in series between the three-phase power input end 3 and the three-phase current output end 4 to form double-stage filtering, high insertion loss in a wide frequency range (0.3 MHz-30 MHz) can be realized, the requirements of military equipment can be met, and the low-frequency common mode inductor 7 and the high-frequency common mode inductor 8 are arranged by arranging the first differential mode capacitor assembly 51 between the three-phase power input end 3 and the low-frequency common mode inductor 7, the second differential mode capacitor assembly 52 between the low-frequency common mode inductor 7 and the high-frequency common mode inductor 8, the first common mode capacitor assembly 61 between the low-frequency common mode inductor 7 and the high-frequency common mode inductor 8, and the second common mode, The first differential mode capacitor assembly 51 and the second differential mode capacitor assembly 52 form a pi-type differential mode symmetrical circuit structure, and the high-frequency common mode inductor 8, the first common mode capacitor assembly 61 and the second common mode capacitor assembly 62 form a pi-type common mode symmetrical circuit structure, so that electromagnetic interference of a circuit can be sufficiently suppressed.
The utility model provides a three-phase four-wire power filter, compared with the prior art, the utility model discloses a three-phase four-wire power filter, through establish ties low frequency common mode inductance 7 and high frequency common mode inductance 8 of different frequency characteristics between three phase current input 3 and three phase current output 4 respectively, doublestage filtering has been formed, can realize the high insertion loss in wide band range, can satisfy military equipment's requirement, and through setting up first differential mode capacitance subassembly 51 between three phase current input 3 and low frequency common mode inductance 7, second differential mode capacitance subassembly 52 sets up between low frequency common mode inductance 7 and high frequency common mode inductance 8, first common mode capacitance subassembly 61 sets up between low frequency common mode inductance 7 and high frequency common mode inductance 8, second common mode capacitance subassembly 62 sets up between high frequency common mode inductance 8 and three phase current output 4, thereby make low frequency common mode inductance 7, The first differential mode capacitor assembly 51 and the second differential mode capacitor assembly 52 form a pi-type differential mode symmetrical circuit structure, and the high-frequency common mode inductor 8, the first common mode capacitor assembly 61 and the second common mode capacitor assembly 62 form a pi-type common mode symmetrical circuit structure, so that electromagnetic interference of a circuit can be sufficiently suppressed.
Further, referring to fig. 1 to 3, as an embodiment of the three-phase four-wire power filter provided by the present invention, the three-phase four-wire power filter further includes a central line N, a central line input terminal and a central line output terminal respectively connected to two ends of the central line N. The phase lines include a first phase line, a second phase line and a third phase line, the three-phase power input terminal 3 includes a first phase input terminal L1, a second phase input terminal L2 and a third phase input terminal L3, and the three-phase current output terminal 4 includes a first phase output terminal L1 ', a second phase output terminal L2 ' and a third phase output terminal L3 '. The first phase input end L1 and the first phase output end L1 ' are respectively connected to two ends of the first phase line, the second phase input end L2 and the second phase output end L2 ' are respectively connected to two ends of the second phase line, and the third phase input end L3 and the third phase output end L3 ' are respectively connected to two ends of the third phase line. The low-frequency common mode inductor 7 includes a low-frequency magnetic ring 71, and a first inductor coil 72, a second inductor coil 73, a third inductor coil 74 and a fourth inductor coil 75 wound on the low-frequency magnetic ring 71 at intervals. Specifically, in the present embodiment, the first inductor 72 is connected between the first phase input end L1 and the first phase output end L1 ', the second inductor 73 is connected between the second phase input end L2 and the second phase output end L2 ', the third inductor 74 is connected between the third phase input end L3 and the third phase output end L3 ', and the fourth inductor 75 is connected between the neutral input end and the neutral output end. The high-frequency common mode inductor 8 includes a high-frequency magnetic ring 81, a fifth inductor 82, a sixth inductor 83, a seventh inductor 84, and an eighth inductor 85 wound on the high-frequency magnetic ring 81 at intervals. Specifically, in the present embodiment, the fourth inductor 75 is connected between the first phase input end L1 and the first phase output end L1 ', the fifth inductor 82 is connected between the second phase input end L2 and the second phase output end L2 ', the sixth inductor 83 is connected between the third phase input end L3 and the third phase output end L3 ', and the seventh inductor 84 is connected between the neutral input end and the neutral output end. The low-frequency common mode inductor 7 and the high-frequency common mode inductor 8 with different frequency characteristics are respectively connected in series on each phase line, double-stage filtering is formed, high insertion loss in a wide frequency range can be achieved, and requirements of military equipment can be met.
Further, referring to fig. 1 to 3, as a specific embodiment of the three-phase four-wire power filter provided by the present invention, the low frequency magnetic ring 71 is an amorphous magnetic ring, and the high frequency magnetic ring 81 is a manganese zinc ferrite magnetic ring, so as to achieve a high insertion loss in the range of 0.3MHz to 30MHz, and effectively suppress the electromagnetic interference.
Further, please refer to fig. 2, as a specific implementation manner of the three-phase four-wire power filter provided in the present invention, a cross partition plate 10 is disposed in the low frequency magnetic ring 71, and the cross partition plate 10 in the low frequency magnetic ring 71 is used for isolating the first inductance coil 72, the second inductance coil 73, the third inductance coil 74 and the fourth inductance coil 75 from each other, so as to avoid mutual interference between the phase lines, thereby effectively suppressing electromagnetic interference. The high-frequency magnetic ring 81 may also be provided with a cross partition board 10, and the cross partition board 10 in the high-frequency magnetic ring 81 is used for isolating the fifth inductance coil 82, the sixth inductance coil 83, the seventh inductance coil 84 and the eighth inductance coil 85 from each other, so as to avoid mutual interference between phase lines and further improve the capability of suppressing electromagnetic interference. Preferably, the cruciform baffle 10 is made of an insulating material.
Further, referring to fig. 2, as a specific implementation manner of the three-phase four-wire power filter provided by the present invention, the first inductor coil 72, the second inductor coil 73, the third inductor coil 74, the fourth inductor coil 75, the fifth inductor coil 82, the sixth inductor coil 83, the seventh inductor coil 84, and the eighth inductor coil 85 may be wound in a double-wire parallel winding manner, so as to reduce the internal resistance of the filter. Because the electric current is bigger, in order to satisfy the requirement of crossing the electricity, if adopt the mode of single line coiling, need adopt thicker line to carry out the coiling, it not only draws easily and splits and difficult assembly, and the utility model discloses an adopt the mode of double-line duplex winding, not only can satisfy the requirement of crossing the electricity of heavy current, effectively reduce the wave filter internal resistance, and the assembly is simple.
Further, please refer to fig. 1 to fig. 3, as an embodiment of the three-phase four-wire power filter provided by the present invention, the first differential mode capacitor module 51 includes a first capacitor C1, a second capacitor C2 and a third capacitor C3, the first capacitor C1 is connected between the first phase line and the central line N, the second capacitor C2 is connected between the second phase line and the central line N, and the third capacitor C3 is connected between the third phase line and the central line N. Preferably, the first differential-mode capacitor assembly 51 further includes a first resistor R1, a second resistor R2, and a third resistor R3, the first resistor R1 is connected in parallel across the first capacitor C1, the second resistor R2 is connected in parallel across the second capacitor C2, and the third resistor R3 is connected in parallel across the third resistor R3. Through the parallel arrangement of first resistance R1, second resistance R2 and third resistance R3 respectively with first electric capacity C1, second electric capacity C2 and third electric capacity C3, power cord plug is electrified for a long time when can effectively preventing the power cord from unplugging and plugging, and is safe and reliable more.
Further, please refer to fig. 1 to fig. 3, as an embodiment of the three-phase four-wire power filter provided by the present invention, the second differential mode capacitor assembly 52 includes a fourth capacitor C4, a fifth capacitor C5 and a sixth capacitor C6, the fourth capacitor C4 is connected between the first phase line and the central line N, the fifth capacitor C5 is connected between the second phase line and the central line N, and the sixth capacitor C6 is connected between the third phase line and the central line N. The low-frequency common-mode inductor 7, the first differential-mode capacitor assembly 51 and the second differential-mode capacitor assembly 52 form a pi-type differential-mode symmetrical circuit structure, so that the electromagnetic interference of a line can be sufficiently suppressed.
Further, please refer to fig. 1 to fig. 3, as a specific implementation manner of the three-phase four-wire power filter provided by the present invention, the three-phase four-wire power filter further includes a ground wire G, the first common mode capacitor module 61 includes a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9 and a tenth capacitor C10, the seventh capacitor C7 is connected between the first phase wire and the ground wire G, the eighth capacitor C8 is connected between the second phase wire and the ground wire G, the ninth capacitor C9 is connected between the third phase wire and the ground wire G, and the tenth capacitor C10 is connected between the middle wire and the ground wire G. The second common mode capacitor assembly 62 includes an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13 and a fourteenth capacitor C14, the eleventh capacitor C11 is connected between the first phase line and the ground line G, the twelfth capacitor C12 is connected between the second phase line and the ground line G, the thirteenth capacitor C13 is connected between the third phase line and the ground line G, and the fourteenth capacitor C14 is connected between the neutral line N and the ground line G. The high-frequency common-mode inductor 8, the first common-mode capacitor assembly 61 and the second common-mode capacitor assembly 62 form a pi-type common-mode symmetrical circuit structure, so that electromagnetic interference of a line can be sufficiently suppressed.
Further, please refer to fig. 1 to fig. 3, as an embodiment of the three-phase four-wire power filter provided by the present invention, the first differential mode capacitor module 51 further includes a first circuit board 511, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first resistor R1, a second resistor R2 and a third resistor R3 are respectively disposed on the first circuit board 511, the second differential mode capacitor module 52 further includes a second circuit board 521, and a fourth capacitor C4, a fifth capacitor C5 and a sixth capacitor C6 are disposed on the second circuit board 521. The first common mode capacitor assembly 61 further includes a third circuit board 611, and a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9 and a tenth capacitor C10 are respectively disposed on the third circuit board 611. The second common mode capacitor assembly 62 further includes a fourth circuit board 621, and an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13 and a fourteenth capacitor C14 are respectively disposed on the fourth circuit board 621. The three-phase four-wire power filter further comprises a fifth circuit board 9 arranged in the shell 11, and the low-frequency common-mode inductor 7 and the high-frequency common-mode inductor 8 are respectively arranged on the fifth circuit board 9. Preferably, as shown in fig. 6, the fifth circuit board 9 may use a manner that copper plating and an enameled wire 91 run in parallel, and the copper plating and the enameled wire 91 jointly implement electrical connection between components on the circuit board, so as to enhance main line overload capacity. Preferably, the enameled wire 91 is sheathed with an insulating sleeve 92, so as to reduce spatial coupling between the wires. Further, the first circuit board 511, the second circuit board 521, the third circuit board 611 and the fourth circuit board 621 can also adopt a mode of copper-clad wire and enameled wire being connected in parallel in one direction.
Further, as the utility model provides a three-phase four-wire power filter's a specific embodiment, casing 1 intussuseption is filled with heat conduction silica gel (not shown in the figure), through inside embedment solidification to reduce its calorific capacity, improve wave filter anti-vibration, shock resistance. Further, this casing 1 still can adopt flange (not shown in the figure) to fix a position the installation to further improve wave filter anti-vibration, shock resistance, make the utility model discloses a three-phase four-wire power filter not only can realize the requirement of wide operating temperature scope, strengthens the environmental suitability requirement of wave filter simultaneously, strengthens the reliability of wave filter, reaches for military use requirement, satisfies GJB1518A and GJB 360B's test requirement simultaneously.
Further, please refer to fig. 1, as the utility model provides a three-phase four-wire power filter's a specific implementation, three-phase power input 3 and three-phase current output 4 can adopt the screw rod to carry out electrically conductive mode to realized that the electrical property of external lead and the internal circuit of wave filter switches on, and made three-phase power input 3 and three-phase current output 4's electric transmission more stable, current impact resistance and anti-electromagnetic interference ability are stronger.
The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The three-phase four-wire power filter comprises a phase wire, a three-phase power input end and a three-phase current output end, wherein the three-phase power input end and the three-phase current output end are respectively connected to two ends of the phase wire; the method is characterized in that: the low-frequency common mode inductor, the high-frequency common mode inductor, the first differential mode capacitor assembly, the second differential mode capacitor assembly, the first common mode capacitor assembly and the second common mode capacitor assembly are respectively arranged in the shell, the low-frequency common mode inductor and the high-frequency common mode inductor are respectively connected in series between the three-phase power input end and the three-phase current output end, the first differential mode capacitor assembly is arranged between the three-phase power input end and the low-frequency common mode inductor, the second differential mode capacitor assembly is arranged between the low-frequency common mode inductor and the high-frequency common mode inductor, and the first common mode capacitor assembly is arranged between the low-frequency common mode inductor and the high-frequency common mode inductor, the second common mode capacitor assembly is arranged between the high-frequency common mode inductor and the three-phase current output end.
2. A three-phase four-wire power filter as claimed in claim 1, wherein: the three-phase four-wire power filter further comprises a neutral wire, a neutral wire input end and a neutral wire output end, wherein the neutral wire input end and the neutral wire output end are respectively connected to two ends of the neutral wire, the phase wires comprise a first phase wire, a second phase wire and a third phase wire, the three-phase power input end comprises a first phase input end, a second phase input end and a third phase input end, the three-phase current output end comprises a first phase output end, a second phase output end and a third phase output end, the first phase input end and the first phase output end are respectively connected to two ends of the first phase wire, the second phase input end and the second phase output end are respectively connected to two ends of the second phase wire, and the third phase input end and the third phase output end are respectively connected to;
the low-frequency common-mode inductor comprises a low-frequency magnetic ring, and a first inductance coil, a second inductance coil, a third inductance coil and a fourth inductance coil which are wound on the low-frequency magnetic ring at intervals, wherein the first inductance coil is connected between the first phase input end and the first phase output end, the second inductance coil is connected between the second phase input end and the second phase output end, the third inductance coil is connected between the third phase input end and the third phase output end, and the fourth inductance coil is connected between the neutral line input end and the neutral line output end;
the high-frequency common-mode inductor comprises a high-frequency magnetic ring, and fifth, sixth, seventh and eighth inductance coils wound on the high-frequency magnetic ring at intervals, the fourth inductance coil is connected between the first phase input end and the first phase output end, the fifth inductance coil is connected between the second phase input end and the second phase output end, the sixth inductance coil is connected between the third phase input end and the third phase output end, and the seventh inductance coil is connected between the neutral line input end and the neutral line output end.
3. A three-phase four-wire power filter as claimed in claim 2, wherein: the low-frequency magnetic ring is an amorphous magnetic ring, and the high-frequency magnetic ring is a manganese-zinc ferrite magnetic ring.
4. A three-phase four-wire power filter as claimed in claim 2, wherein:
a cross clapboard is arranged in the low-frequency magnetic ring and/or the high-frequency magnetic ring,
the cross-shaped partition board in the low-frequency magnetic ring is used for isolating the first inductance coil, the second inductance coil, the third inductance coil and the fourth inductance coil from each other;
the cross-shaped partition board in the high-frequency magnetic ring is used for isolating the fifth inductance coil, the sixth inductance coil, the seventh inductance coil and the eighth inductance coil from each other.
5. A three-phase four-wire power filter as claimed in claim 2, wherein: the first differential mode capacitor assembly comprises a first capacitor, a second capacitor and a third capacitor, the first capacitor is connected between the first phase line and the neutral line, the second capacitor is connected between the second phase line and the neutral line, and the third capacitor is connected between the third phase line and the neutral line.
6. A three-phase four-wire power filter as claimed in claim 5, wherein: the first differential mode capacitor assembly further comprises a first resistor, a second resistor and a third resistor, wherein the first resistor is connected to two ends of the first capacitor in parallel, the second resistor is connected to two ends of the second capacitor in parallel, and the third resistor is connected to two ends of the third resistor in parallel.
7. A three-phase four-wire power filter as claimed in claim 2, wherein: the second differential mode capacitor assembly comprises a fourth capacitor, a fifth capacitor and a sixth capacitor, the fourth capacitor is connected between the first phase line and the neutral line, the fifth capacitor is connected between the second phase line and the neutral line, and the sixth capacitor is connected between the third phase line and the neutral line.
8. A three-phase four-wire power filter as claimed in claim 2, wherein: the three-phase four-wire power supply filter further comprises a ground wire, the first common-mode capacitor assembly comprises a seventh capacitor, an eighth capacitor, a ninth capacitor and a tenth capacitor, the seventh capacitor is connected between the first phase wire and the ground wire, the eighth capacitor is connected between the second phase wire and the ground wire, the ninth capacitor is connected between the third phase wire and the ground wire, and the tenth capacitor is connected between the neutral wire and the ground wire.
9. A three-phase four-wire power filter as claimed in claim 8, wherein: the second common-mode capacitor assembly comprises an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor and a fourteenth capacitor, the eleventh capacitor is connected between the first phase line and the ground line, the twelfth capacitor is connected between the second phase line and the ground line, the thirteenth capacitor is connected between the third phase line and the ground line, and the fourteenth capacitor is connected between the neutral line and the ground line.
10. A three-phase four-wire power filter according to any of claims 1-9, wherein: and heat-conducting silica gel is filled in the shell.
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| CN201921041788.5U CN210246320U (en) | 2019-07-04 | 2019-07-04 | Three-phase four-wire power filter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110350532A (en) * | 2019-07-04 | 2019-10-18 | 深圳振华富电子有限公司 | Three-phase four-wire power filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110350532A (en) * | 2019-07-04 | 2019-10-18 | 深圳振华富电子有限公司 | Three-phase four-wire power filter |
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