CN218548170U

CN218548170U - Photovoltaic inverter high-power three-phase large-current flat double-wire common mode inductor

Info

Publication number: CN218548170U
Application number: CN202223018362.2U
Authority: CN
Inventors: 李光荣; 杨成; 孟创园
Original assignee: Guangdong Lianda Mingci Technology Co ltd
Current assignee: Guangdong Lianda Mingci Technology Co ltd
Priority date: 2022-11-14
Filing date: 2022-11-14
Publication date: 2023-02-28
Anticipated expiration: 2032-11-14

Abstract

The utility model discloses a flat double-wire common mode inductance of photovoltaic inverter high power three-phase heavy current, including the common mode magnetic core to and six groups are around rolling up the coil unit on the common mode magnetic core, and every coil unit of group includes two strands of the same flat wire coil, and two strands of flat wire coil all are around rolling up according to the same clearance, and the width in clearance is greater than single flat wire coil's thickness, and one of them flat wire coil is from another flat wire coil's clearance embedding, overlaps until two strands of flat wire coil. The utility model has the advantages that: two identical flat wire coils are overlapped and wound to form a coil unit, and the two flat wire coils are connected in parallel, so that the skin effect generated under high frequency can be greatly reduced, the sectional areas of copper wires with the same inductance are large, the heat dissipation area and the current carrying capacity are larger after the two flat wire coils are combined, a flat wire with wider width is not needed, and the volume of a single common mode inductor is not changed.

Description

Photovoltaic inverter high-power three-phase large-current flat double-wire common mode inductor

Technical Field

The utility model relates to a common mode inductance technical field especially relates to a flat double-line common mode inductance of photovoltaic inverter high power three-phase heavy current.

Background

In order to suppress electromagnetic interference signals (EMI) in the switching power supply, a common mode inductor needs to be added to the switching power supply. With the switching frequency of the switching power supply being higher and higher, the generated electromagnetic interference signal is also stronger and stronger, so that the common mode inductor product is required to be high-frequency, and high efficiency performance is achieved on the premise of small size.

At present, the manufacturing process of the existing common mode inductor is to wind a single-stranded flat wire, and along with the increase of the power of an inverter, the sectional area of the single-stranded vertically-wound copper wire can not meet the temperature rise requirement in a non-air cooling mode. With the increase of input frequency, the common mode inductor can only use a flat wire with wider width during design, so that the volume of a single common mode inductor is increased, the sectional area of a single flat wire is overlarge, the single flat wire can be influenced by a high-frequency skin effect during working, and the copper loss can be increased under high frequency.

SUMMERY OF THE UTILITY MODEL

To the above problem, the utility model provides a flat double-line common mode inductance of photovoltaic inverter high power three-phase heavy current mainly solves current common mode inductance and uses the flat line of monospar to carry out the coiling, leads to single common mode inductance volume grow to and the problem that copper decreases the increase under the high frequency.

In order to solve the technical problem, the technical scheme of the utility model as follows:

the common mode inductor comprises a common mode magnetic core and six groups of coil units wound on the common mode magnetic core, wherein each group of coil units comprises two identical flat wire coils, the two flat wire coils are wound according to the same gap, the width of the gap is larger than the thickness of the single flat wire coil, and one flat wire coil is embedded from the gap of the other flat wire coil until the two flat wire coils are overlapped.

In some embodiments, the flat wire coil is an enameled wire.

In some embodiments, the coil unit further comprises a bottom plate, wherein a surface of the bottom plate is provided with mounting holes, and the pins of the coil unit are led out from the bottom of the bottom plate through the mounting holes.

In some embodiments, the pins of the coil unit are soldered to the mounting holes.

In some embodiments, each pin of the flat wire coil corresponds to a separate one of the mounting holes.

In some embodiments, the coil unit further comprises an insulating sleeve, the insulating sleeve is sleeved on the outer wall of the pin of the coil unit, and the insulating sleeve is located above the bottom plate.

In some embodiments, the coil unit further includes a fixing member, and two ends of the fixing member are fixedly connected to the common mode magnetic core and the coil unit, respectively.

In some embodiments, the securing member is an epoxy glue.

The utility model has the advantages that: two identical flat wire coils are overlapped and wound to form a coil unit, and the two flat wire coils are connected in parallel, so that the skin effect generated under high frequency can be greatly reduced, the sectional areas of copper wires with the same inductance are large, the heat dissipation area and the current carrying capacity are larger after the two flat wire coils are combined, a flat wire with wider width is not needed, and the volume of a single common mode inductor is not changed.

Drawings

Fig. 1 is a perspective view of a photovoltaic inverter high-power three-phase large-current flat double-wire common mode inductor disclosed in an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 taken along line A;

fig. 3 is a schematic structural diagram of two flat wire coils disclosed in the embodiment of the present invention before rotation;

fig. 4 is a schematic structural diagram of two flat wire coils in rotation according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of two flat wire coils according to an embodiment of the present invention when they are overlapped;

fig. 6 is a front view of a high-power three-phase large-current flat double-wire common mode inductor of a photovoltaic inverter according to another embodiment of the present invention;

fig. 7 is a bottom view of a high-power three-phase large-current flat double-wire common mode inductor of a photovoltaic inverter according to another embodiment of the present invention;

wherein: 1-common mode magnetic core, 2-coil unit, 3-bottom plate, 4-insulating sleeve, 5-fixing piece and 201-flat wire coil.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the following will explain the contents of the present invention in detail with reference to the accompanying drawings and the detailed description. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the relevant portions of the present invention are shown in the drawings.

The embodiment provides a photovoltaic inverter high-power three-phase large-current flat double-wire common mode inductor, as shown in fig. 1, which includes a common mode magnetic core 1, and six sets of coil units 2 wound around the common mode magnetic core 1, as shown in fig. 2, each set of coil unit 2 includes two identical flat wire coils 201, the two flat wire coils 201 are wound at the same gap, the width of the gap is greater than the thickness of a single flat wire coil 201, and one flat wire coil 201 is embedded from the gap of the other flat wire coil 201 until the two flat wire coils 201 are overlapped.

In this embodiment, two identical flat wire coils 201 are overlapped and wound to form the coil unit 2, and the two flat wire coils 201 are connected in parallel to greatly reduce the skin effect generated at high frequency, so that the cross-sectional area of the copper wire with the same inductance, the heat dissipation area and the current carrying capacity are larger after the two flat wire coils are combined, and the volume of a single common mode inductor is not changed without using a flat wire with a wider width.

As shown in fig. 3, two strands of flat wires are wound around the common mode magnetic core 1 in advance according to a predetermined gap to form two independent strands of flat wire coils 201, taking fig. 4 as an example, wherein the right end of one strand of flat wire coils 201 is embedded from the left end of the other strand of flat wire coils 201, and is continuously screwed to the right until the two strands of flat wire coils 201 are overlapped, and the effect is shown in fig. 5.

The flat wire coil 201 is an enameled wire, and may be a flat conductor wire wrapped with another insulating material.

In a preferred scheme, as shown in fig. 6, the coil unit further comprises a bottom plate 3, a surface of the bottom plate 3 is provided with mounting holes, and pins of the coil unit 2 are led out from the bottom of the bottom plate 3 through the mounting holes. In this embodiment, the bottom plate 3 serves as a support base for the common mode core 1 and the coil unit 2, and the coil unit 2 and the bottom plate 3 are fixed by inserting the pins of the coil unit 2 into the bottom plate 3 and fixing the pins of the coil unit 2 to the mounting holes by using a certain fixing method. In an optional example, a pad is disposed on the mounting hole to facilitate soldering, and the pin of the coil unit 2 is soldered on the mounting hole.

Since each set of coil units 2 in this embodiment includes two identical flat wire coils 201, preferably, as shown in fig. 7, each pin of the flat wire coil 201 corresponds to an independent mounting hole, so that a damaged single flat wire coil 201 can be conveniently removed from the mounting hole in the maintenance process.

In an alternative embodiment, with continued reference to fig. 6, an insulating sleeve 4 is further included, the insulating sleeve 4 is sleeved on the outer wall of the pin of the coil unit 2, and the insulating sleeve 4 is located above the bottom plate 3 for enhancing the insulating strength of the contact position between the pin of the coil unit 2 and the bottom plate 3.

In an alternative embodiment, with continued reference to fig. 6, a fixing member 5 is further included, and both ends of the fixing member 5 are respectively fixedly connected to the common mode magnetic core 1 and the coil unit 2. The fixing member 5 may be any insulating fixing device, such as a binding tape, and preferably, the fixing member 5 may be made of epoxy glue, and during the use process, the ball-shaped epoxy glue is pressed at the contact position between the common mode core 1 and the coil unit 2, so as to quickly bond the common mode core 1 and the coil unit 2.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the essence of the present invention should be covered in the protection scope of the present invention.

Claims

1. The common mode inductor comprises a common mode magnetic core and six groups of coil units wound on the common mode magnetic core, and is characterized in that each group of coil units comprises two identical flat wire coils, the two flat wire coils are wound according to the same gap, the width of the gap is larger than the thickness of the single flat wire coil, and one flat wire coil is embedded from the gap of the other flat wire coil until the two flat wire coils are overlapped.

2. The photovoltaic inverter high-power three-phase high-current flat double-wire common mode inductor according to claim 1, wherein the flat wire coil is an enameled wire.

3. The photovoltaic inverter high-power three-phase high-current flat double-wire common mode inductor according to claim 1, further comprising a bottom plate, wherein a surface of the bottom plate is provided with mounting holes, and the pins of the coil unit are led out from the bottom of the bottom plate through the mounting holes.

4. The photovoltaic inverter high-power three-phase high-current flat double-wire common mode inductor according to claim 3, wherein the pins of the coil unit are welded on the mounting holes.

5. The pv inverter high power three phase high current flat dual wire common mode inductor according to claim 4 wherein each leg of the flat wire coil corresponds to an independent one of the mounting holes.

6. The photovoltaic inverter high-power three-phase high-current flat double-wire common-mode inductor according to claim 3, further comprising an insulating sleeve, wherein the insulating sleeve is sleeved on the outer wall of the pin of the coil unit, and the insulating sleeve is located above the bottom plate.

7. The flat double-wire common mode inductor of photovoltaic inverter high power three-phase large current of claim 1, further comprising a fixing member, wherein two ends of the fixing member are fixedly connected with the common mode magnetic core and the coil unit respectively.

8. The pv inverter high power three phase high current flat two wire common mode inductor of claim 7 wherein the fixture is an epoxy glue.