Three-phase four-wire differential mode inductor

Abstract

The utility model discloses a three-phase four-wire differential mode inductor. The three-phase four-wire differential mode inductor comprises an upper yoke magnetic core, a lower yoke magnetic core, four middle column magnetic cores, four coils and two oppositely-arranged frameworks. The four coils are wound on the two oppositely arranged frameworks, and the two oppositely arranged frameworks are used for isolating the four coils from the upper yoke magnetic core, the lower yoke magnetic core and the four middle column magnetic cores; the four coils comprise a first coil, a second coil and a third coil which are used for being connected with three-phase power of a power supply, and further comprise a fourth coil connected to a neutral line of the differential mode inductor in series.

Description

Technical Field

[0001] The utility model relates to a three-phase four-wire differential mode inductor, belonging to the technical field of electronic components. Background Art

[0002] Three-phase differential mode inductors are inductors used to suppress differential mode noise on power lines or signal lines, and are particularly suitable for high current applications. In practical applications, three-phase differential mode inductors can be used to improve power quality, suppress differential mode interference on signal lines, or as key components in EMI filter circuits to reduce differential mode interference on lines.

[0003] In an ideal state, the three-phase power supply current flows into the three-phase differential mode inductor, the three phases are balanced, and the current flowing out of the three phases to the neutral line (n line) is 0A; however, in actual use scenarios, the current of each phase of the three phases is different, that is, the three phases are not balanced, and the current flowing out of the three-phase unbalanced current to the neutral line is greater than 0A. When a three-phase power supply fails, for example: one phase of the three-phase power supply is disconnected or fails, and the current of this phase is 0A, the three phases are extremely unbalanced, and the current flowing out to the neutral line is close to the current of a single phase. When there is current passing through the neutral line, the existing three-phase three-wire differential mode inductor cannot filter the current flowing through the neutral line, which can easily cause damage to electronic components or electrical equipment in the surrounding circuits. Utility Model Content

[0004] The main purpose of the utility model is to overcome the deficiencies of the above-mentioned prior art and to propose a three-phase four-wire differential mode inductor to solve the problem that the current flowing through the neutral line of the existing three-phase three-wire differential mode inductor can easily cause damage to electronic components or electrical equipment in the peripheral circuits.

[0005] In order to achieve the above-mentioned purpose, the utility model proposes the following technical solutions:

[0006] A three-phase four-wire differential mode inductor comprises an upper yoke magnetic core, a lower yoke magnetic core, four middle column magnetic cores, four coils and two oppositely arranged skeletons; the four coils are wound on the two oppositely arranged skeletons, and the two oppositely arranged skeletons are used to isolate the four coils from the upper yoke magnetic core, the lower yoke magnetic core and the four middle column magnetic cores; the four coils comprise a first coil, a second coil and a third coil for accessing three-phase electricity of a power supply, and also comprise a fourth coil connected in series to a neutral line of the differential mode inductor.

[0007] Further:

[0008] The two relatively arranged frames are butted together in an internal and external bite manner.

[0009] The two oppositely arranged skeletons are a first skeleton and a second skeleton, the first skeleton includes a first cavity for accommodating the upper yoke magnetic core and four first cylinders for accommodating the right half of the four middle column magnetic cores, the second skeleton includes a second cavity for accommodating the lower yoke magnetic core and four second cylinders for accommodating the left half of the four middle column magnetic cores; the four coils are respectively wound on four cylinders formed by combining the four first cylinders and the four second cylinders.

[0010] Among the four first cylinders, n first cylinders have ends provided with first joints whose outer diameter is smaller than that of the first cylinder; among the four second cylinders, 4-n second cylinders have ends provided with second joints whose outer diameter is smaller than that of the second cylinder; wherein n=0, 1, 2, 3, 4; the first cylinder provided with the first joint corresponds to the second cylinder not provided with the second joint, and the second cylinder provided with the second joint corresponds to the first cylinder not provided with the first joint; the first joint is configured to be inserted into the corresponding second cylinder not provided with the second joint to achieve a tight fit, and the second joint is configured to be inserted into the corresponding first cylinder not provided with the first joint to achieve a tight fit, thereby achieving the internal and external bite-type docking of the first skeleton and the second skeleton.

[0011] A plurality of reinforcing ribs are respectively disposed on the outer sides of the first cavity and the second cavity.

[0012] The three-phase four-wire differential mode inductor also includes a base plate, and the inductor body assembled by the upper yoke core, the lower yoke core, the four middle column cores, the four coils and the two oppositely arranged skeletons is fixed on the base plate; the eight lead ends of the four coils are led out from the base plate with PIN pins.

[0013] Insulating air gap sheets are used at the joint surfaces between the two ends of the four middle column magnetic cores and the upper yoke magnetic core and the lower yoke magnetic core, or no insulating air gap sheets are used.

[0014] The two ends of the four middle column magnetic cores are respectively bonded to the joint surfaces of the upper yoke magnetic core and the lower yoke magnetic core by using glue.

[0015] The bottom plate and the frame are both made of insulating plastic materials.

[0016] The beneficial effect of the technical solution of the utility model is embodied in that when one phase of the three-phase power supply is disconnected or fails, the current of this phase is 0A, and the three phases are extremely unbalanced at this time, and the current flowing out to the neutral line (n line) is close to the current of the single phase. When current flows through the neutral line, the fourth coil connected in series to the neutral line can filter the current flowing through the neutral line, thereby protecting the electronic components or electrical equipment in the surrounding circuits. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a 3D schematic diagram of a three-phase four-wire differential mode inductor according to an embodiment of the utility model.

[0018] Figure 2 It is a structural explosion diagram of a three-phase four-wire differential mode inductor according to an embodiment of the utility model.

[0019] Figure 3 It is a schematic structural diagram of a three-phase four-wire differential mode inductor according to an embodiment of the utility model.

[0020] Figure 4 It is a top view of a three-phase four-wire differential mode inductor according to an embodiment of the utility model.

[0021] Figure 5 It is a bottom view of the three-phase four-wire differential mode inductor according to an embodiment of the utility model.

[0022] Figure 6 It is a front view of a three-phase four-wire differential mode inductor according to an embodiment of the utility model.

[0023] Figure 7 It is a right view of the three-phase four-wire differential mode inductor according to an embodiment of the utility model.

[0024] Figure 8 It is a schematic diagram of the circuit principle of a three-phase four-wire differential mode inductor according to an embodiment of the utility model.

[0025] Fig. 9 This is a test wiring diagram of a three-phase four-wire differential mode inductor according to an embodiment of the utility model. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods and examples. The purpose of providing the examples is only for illustration, and no limitation is imposed. In addition, the spatial orientation words such as "upper", "lower", "left", "right", "top", and "bottom" used in the description of the technical solution of the present invention are convenient for describing the relative position relationship between the components of the product, and do not mean that the product has only the orientation shown in the figure. In actual use, as the orientation of the product is different, the spatial related descriptions used to describe its orientation should also be interpreted in a similar way. In addition, the terms "first" and "second" are only used to distinguish components. It should be understood that these components should not be limited by such terms. They themselves do not mean that these elements have the aforementioned ordinal numbers, nor do they represent the arrangement order of a certain component and another component or the order of the manufacturing method.

[0027] The present invention provides a three-phase four-wire differential mode inductor (hereinafter referred to as "differential mode inductor"), wherein Figure 1 This is a 3D schematic diagram of the differential mode inductor. Figure 2 This is the structural explosion diagram of the differential mode inductor. Figure 3 is the structural diagram of the differential mode inductor. Figure 4 yes Figure 3 The top view of the differential mode inductor is shown in FIG. Figure 5 yes Figure 3 The bottom view of the differential mode inductor is shown in FIG. Figure 6 yes Figure 3 The main view of the differential mode inductor is shown in FIG. Figure 7 yes Figure 3 The right side view of the differential mode inductor is shown in Figure 1. Figures 2 to 7 The differential mode inductor comprises: an upper yoke core 11, a lower yoke core 12, four middle column cores 21, 22, 23, 24, four coils 31, 32, 33, 34, a first frame 41 and a second frame 42 arranged oppositely, and a bottom plate 5. The inductor body assembled by the upper yoke core 11, the lower yoke core 12, the four middle column cores 21-24, the four coils 31-34, the first frame 41, and the second frame 42 is fixed on the bottom plate 5, and the eight lead-out ends of the four coils 31-34 are led out from the bottom plate 5. Among them, the four coils 31-34 are respectively the first coil 31, the second coil 32 and the third coil 33 for connecting the three-phase power of the power supply, and the fourth coil 34 connected in series to the neutral line (n line) of the differential mode inductor.

[0028] Continue to refer Figure 2 The first frame 41 includes a first cavity for accommodating the upper yoke core 11 and four first cylinders for accommodating the right half of the four middle column cores 21 to 24; the second frame 42 includes a second cavity for accommodating the lower yoke core 12 and four second cylinders for accommodating the left half of the four middle column cores 21 to 24. The four coils 31 to 34 are respectively wound on four cylinders formed by combining the four first cylinders and the four second cylinders, and the four cylinders isolate the four coils from the four middle column cores; the first cavity of the first frame isolates the four coils from the upper yoke core, and the second cavity of the second frame isolates the four coils from the lower yoke core.

[0029] The first frame 41 and the second frame 42 are butted together in an internal-external engagement manner. Figure 2Among the four first cylinders of the first skeleton 41, the ends of two first cylinders are provided with first joints 411 whose outer diameter is smaller than the outer diameter of the first cylinder; among the four second cylinders of the second skeleton 42, the ends of two second cylinders are provided with second joints 421 whose outer diameter is smaller than the outer diameter of the second cylinder. The two first cylinders provided with the first joints 411 correspond to the two second cylinders without the second joints, and at the same time, the two second cylinders provided with the second joints 421 correspond to the two first cylinders without the first joints; the first joints 411 are configured to be inserted into the corresponding second cylinder without the second joints to achieve a tight fit, and at the same time, the second joints 421 are configured to be inserted into the corresponding first cylinder without the first joints to achieve a tight fit, thereby achieving the internal and external bite-type docking of the first skeleton 41 and the second skeleton 42.

[0030] Those skilled in the art should understand that the above is only an example, and the four first cylinders may all be provided with the first joint portion, while the four second cylinders may not be provided with the second joint portion; or the four second cylinders may all be provided with the second joint portion, while the four first cylinders may not be provided with the first joint portion; or one (or three) of the four first cylinders may be provided with the first joint portion, while three (or one) of the four second cylinders may be provided with the second joint portion. The first cylinder provided with the first joint portion corresponds to the second cylinder not provided with the second joint portion, and the second cylinder provided with the second joint portion corresponds to the first cylinder not provided with the first joint portion.

[0031] Continue to refer Figure 2 In a preferred embodiment, the outer side surface of the first cavity of the first skeleton 41 is provided with a plurality of reinforcing ribs 412 , and the outer side surface of the second cavity of the second skeleton 42 is also provided with a plurality of reinforcing ribs 422 .

[0032] Preferably, two ends of the four middle column magnetic cores 21 to 24 are respectively bonded to the joint surfaces of the upper yoke magnetic core 11 and the lower yoke magnetic core 12 by using glue.

[0033] In some embodiments, insulating air gap sheets are used at the joint surfaces between the two ends of the four middle column magnetic cores 21 to 24 and the upper yoke magnetic core 11 and the lower yoke magnetic core 12 .

[0034] In some other embodiments, no insulating air gap sheets are used at the joint surfaces between the two ends of the four middle column magnetic cores 21 to 24 and the upper yoke magnetic core 11 and the lower yoke magnetic core 12 .

[0035] In a preferred embodiment, the base plate 5 and the first frame 41 and the second frame 42 are all made of insulating plastic materials; the four coils are copper wires or aluminum wires; the upper yoke magnetic core, the lower yoke magnetic core and the four middle column magnetic cores can be made of silicon steel sheets or metal powder core magnetic materials such as iron silicon, iron silicon aluminum, or amorphous materials.

[0036] Figure 8 is a schematic diagram of the circuit principle of the differential mode inductor of the aforementioned embodiment, Fig. 9 : is the test wiring diagram of the differential mode inductor of the above embodiment. Figure 8 and Fig. 9 As shown, A, B, and C represent the three live wires connected to the three-phase power supply, and n represents the neutral wire (commonly known as the zero wire) connected to the three-phase power supply. S1 and F1 respectively represent the starting wire and the tail wire of the first coil of the differential mode inductor; S2 and F2 respectively represent the starting wire and the tail wire of the second coil; S3 and F3 respectively represent the starting wire and the tail wire of the third coil; S4 and F4 respectively represent the starting wire and the tail wire of the fourth coil. The fourth coil used for current filtering on the neutral line has its tail end F4 connected to the neutral point / neutral line, and its starting end S4 is connected to the n-wire of the three-phase power supply. As shown Fig. 9 As shown, in actual testing, F1, F2, F3, and F4 can be short-circuited together.

[0037] The three-phase four-wire differential mode inductor of the utility model has four middle column magnetic cores corresponding to four coils, which has a filtering effect on the input three-phase power supply. However, when the three phases are unbalanced, especially when one phase of the three-phase power supply is disconnected, the current flowing out of the neutral line is filtered through the fourth coil (S4-F4) connected in series, thereby protecting the electronic components or electrical appliances in the peripheral circuits.

[0038] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For technicians in the technical field to which the present invention belongs, several equivalent substitutions or obvious variations can be made without departing from the concept of the present invention, and the performance or use is the same, which should be regarded as belonging to the protection scope of the present invention.

Claims

1. A three-phase four-wire differential mode inductor, characterized in that: It includes an upper yoke magnetic core, a lower yoke magnetic core, four middle column magnetic cores, four coils and two oppositely arranged frames; The four coils are wound on the two oppositely arranged skeletons, and the two oppositely arranged skeletons are used to isolate the four coils from the upper yoke magnetic core, the lower yoke magnetic core and the four middle column magnetic cores; the four coils include a first coil, a second coil and a third coil for connecting to the three-phase electricity of the power supply, and also include a fourth coil connected in series to the neutral line of the differential mode inductor.

2. The three-phase four-wire differential mode inductor according to claim 1, characterized in that: The two relatively arranged frames are butted together in an internal and external bite manner.

3. The three-phase four-wire differential mode inductor according to claim 1, characterized in that: The two oppositely arranged skeletons are a first skeleton and a second skeleton, the first skeleton includes a first cavity for accommodating the upper yoke magnetic core and four first cylinders for accommodating the right half of the four middle column magnetic cores, the second skeleton includes a second cavity for accommodating the lower yoke magnetic core and four second cylinders for accommodating the left half of the four middle column magnetic cores; the four coils are respectively wound on four cylinders formed by combining the four first cylinders and the four second cylinders.

4. The three-phase four-wire differential mode inductor according to claim 3, characterized in that: Among the four first cylinders, n first cylinders have ends provided with first joints whose outer diameters are smaller than the outer diameters of the first cylinders; among the four second cylinders, 4-n second cylinders have ends provided with second joints whose outer diameters are smaller than the outer diameters of the second cylinders; wherein n=0, 1, 2, 3, 4; The first cylinder provided with the first joint portion corresponds to the second cylinder not provided with the second joint portion, and the second cylinder provided with the second joint portion corresponds to the first cylinder not provided with the first joint portion; the first joint portion is configured to be inserted into the corresponding second cylinder not provided with the second joint portion to achieve a tight fit, and the second joint portion is configured to be inserted into the corresponding first cylinder not provided with the first joint portion to achieve a tight fit, thereby realizing the internal and external bite-type docking of the first skeleton and the second skeleton.

5. The three-phase four-wire differential mode inductor according to claim 3, characterized in that: A plurality of reinforcing ribs are respectively disposed on the outer sides of the first cavity and the second cavity.

6. The three-phase four-wire differential mode inductor according to claim 1, characterized in that: It also includes a base plate, and the inductor body assembled by the upper yoke core, the lower yoke core, the four middle column cores, the four coils and the two oppositely arranged frames is fixed on the base plate; the eight lead ends of the four coils are led out from the base plate with PIN pins.

7. The three-phase four-wire differential mode inductor according to claim 1, characterized in that: Insulating air gap sheets are used at the joint surfaces between the two ends of the four middle column magnetic cores and the upper yoke magnetic core and the lower yoke magnetic core, or no insulating air gap sheets are used.

8. The three-phase four-wire differential mode inductor according to claim 1, characterized in that: The two ends of the four middle column magnetic cores are respectively bonded to the joint surfaces of the upper yoke magnetic core and the lower yoke magnetic core by using glue.

9. The three-phase four-wire differential mode inductor according to claim 6, characterized in that: The bottom plate and the frame are both made of insulating plastic materials.

Images