CN214476870U

CN214476870U - PFC inductance device and current critical continuous control type PFC circuit

Info

Publication number: CN214476870U
Application number: CN202120232768.7U
Authority: CN
Inventors: 范德育; 张梦欢; 张丹月
Original assignee: Hangzhou Zhonhen Electric Co ltd
Current assignee: Hangzhou Zhonhen Electric Co ltd
Priority date: 2021-01-27
Filing date: 2021-01-27
Publication date: 2021-10-22
Anticipated expiration: 2031-01-27

Abstract

The utility model discloses a PFC inductance device and critical continuous control type PFC circuit of electric current relates to electronic components technical field for solve the magnetic core that the heavy load PFC inductance device of the heavy load in the critical continuous control type PFC circuit of electric current adopted the ferrite preparation and lead to whole bulky problem. The PFC inductance device comprises a ferrite assembly, a metal powder assembly, a bypass magnetic column and two coils, wherein the ferrite assembly comprises an upper magnetic conduction plate and a lower magnetic conduction plate, the metal powder assembly comprises two middle magnetic columns, the bypass magnetic column is positioned between the two coils, and two ends of the bypass magnetic column are respectively connected with the upper magnetic conduction plate and the lower magnetic conduction plate; to magnetic column in wantonly, in magnetic column and bypass magnetic column parallel and the cover locate corresponding solenoid, well magnetic column includes the magnetic path of its direction of height concatenation more than two, is formed with the air gap between two magnetic paths, and the value scope of air gap is (0mm, 0.6 mm).

Description

PFC inductance device and current critical continuous control type PFC circuit

Technical Field

The utility model relates to an electronic components technical field especially relates to a PFC inductance device and critical continuous control type PFC circuit of electric current.

Background

The PFC inductor device generally functions in an inductance compensation type PFC circuit and an active PFC circuit, and mainly functions to rectify and store energy. In an inductance compensation type PFC circuit, a PFC inductance device is matched with other elements to reduce the phase difference between fundamental current and voltage of alternating current input. In the active PFC circuit, the PFC inductance device has the function of enabling the input current to be approximately synchronous with the input voltage after being rectified by the PFC inductance device and stored.

In the related art, most PFC inductor devices use ferrite as a core and a wound coil. However, since the PFC inductor in the current critical continuous control PFC circuit is made of ferrite, if a large inductance is required to be lightly loaded, the volume of the PFC inductor is large as a whole.

At present, no effective solution is provided for the problem of large overall volume caused by the fact that a light-load large-inductance PFC inductance device in a current critical continuous control type PFC circuit in the related art is made of ferrite.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the present invention provides a PFC inductor and a current critical continuous control type PFC circuit, which have the advantages of small overall size and large inductance.

The utility model discloses an one of the purpose adopts following technical scheme to realize:

a PFC inductance device comprises a ferrite assembly, a metal powder assembly, bypass magnetic columns and two coils, wherein the ferrite assembly comprises an upper magnetic conductive plate and a lower magnetic conductive plate, and the metal powder assembly comprises two middle magnetic columns;

the bypass magnetic column is positioned between the two coils, and two ends of the bypass magnetic column are respectively connected with the upper magnetic conduction plate and the lower magnetic conduction plate; for any middle magnetic column, the middle magnetic column is parallel to the bypass magnetic column and sleeved in the corresponding solenoid, the middle magnetic column comprises more than two magnetic blocks spliced along the height direction of the middle magnetic column, an air gap is formed between the two magnetic blocks, and the value range of the air gap is (0mm, 0.6 mm).

Further, the relative permeability of the bypass magnetic pillar and the middle magnetic pillar satisfies a second formula, the second formula is u1 < u2, wherein u1 is the relative permeability of the bypass magnetic pillar, and u2 is the relative permeability of the middle magnetic pillar.

Further, the coil is formed by winding a plurality of strands of stranded copper wires.

Furthermore, the cross section of the middle magnetic column is oval.

Further, the cross section of the middle magnetic column conforms to a first formula, and the first formula is as follows: a is more than b, wherein a is a long half shaft of the cross section of the middle magnetic column and is parallel to the width direction of the upper magnetic conductive plate, and b is a short half shaft of the cross section of the middle magnetic column and is parallel to the length direction of the upper magnetic conductive plate.

Furthermore, the two coils are respectively marked as a first coil and a second coil, the bypass magnetic column is provided with a wiring channel, a connecting wire is arranged in the wiring channel, one end of the connecting wire is connected with the first coil, and the other end of the connecting wire is connected with the second coil.

Further, the routing channel is communicated from the side face, facing the first solenoid, of the bypass magnetic pillar to the side face, facing the second solenoid, of the bypass magnetic pillar.

Furthermore, the connecting wire is formed by connecting any outgoing terminal of the first wire packet with the corresponding outgoing terminal of the second wire packet.

The second purpose of the utility model is realized by adopting the following technical scheme:

a current critical continuous control type PFC circuit adopts the PFC inductance device.

Compare correlation technique, the beneficial effects of the utility model reside in that: well magnetic column and bypass magnetic column all adopt metal powder, consequently this PFC inductance device can guarantee in the critical continuous control type PFC circuit of electric current that the inductance volume diminishes when the heavy current, the characteristic that the inductance volume increases when the undercurrent, and corresponding air gap can be in (0mm, 0.6 mm) the value, and it is less than the required air gap of ferrite material under realizing the same effect, consequently the utility model discloses a well magnetic column height is less to whole volume is less.

Drawings

Fig. 1 is a schematic structural diagram of a PFC inductor apparatus according to an embodiment of the present application;

FIG. 2 is an exploded view of FIG. 1 showing the position of the coil and the middle magnetic post;

fig. 3 is a cross-sectional view of a PFC inductor according to an embodiment of the present application, showing the position relationship of the middle leg with respect to the bypass leg;

fig. 4 is a cross-sectional view of a PFC inductor according to an embodiment of the present application, showing the position relationship between the trace channel and the bypass magnetic pillar.

In the figure: 11. an upper magnetic conductive plate; 12. a lower magnetic conductive plate; 13. a bypass magnetic column; 15. a middle magnetic column; 15. a coil; 16. and (6) routing channels.

Detailed Description

The present invention will now be described in more detail with reference to the accompanying drawings, and it is to be understood that the following description of the present invention is made only by way of illustration and not by way of limitation with reference to the accompanying drawings. The various embodiments may be combined with each other to form other embodiments not shown in the following description.

The embodiment provides a PFC inductor device, which is intended to solve the problem in the related art that a light-load large-inductance PFC inductor device in a current critical continuous control type PFC circuit has a magnetic core made of ferrite and thus has a large overall volume.

Fig. 1 is a schematic structural diagram of a PFC inductor apparatus according to an embodiment of the present application; fig. 2 is an exploded view of fig. 1, showing the position relationship of the coil and the middle magnetic pole. Referring to fig. 1 and 2, the PFC inductor is applied to a current critical continuous control type PFC circuit. The PFC inductor device includes a ferrite assembly, a metal powder assembly, a bypass magnetic pillar 13, and two coils 15. The ferrite component comprises an upper magnetic conduction plate 11 and a lower magnetic conduction plate 12, the metal powder component comprises two middle magnetic columns 15, and the bypass magnetic column 13 can be made of metal powder or ferrite. Accordingly, the combination of the upper magnetic conductive plate 11, the lower magnetic conductive plate 12, the bypass magnetic pillar 13, and the middle magnetic pillar 15 can obtain the magnetic core of the PFC inductor apparatus. It will be appreciated that the core may be bonded, integrally formed, welded, etc. at the attachment location, but for reasons of manufacturing efficiency and cost, the bonded form is preferred here.

The upper magnetic conductive plate 11 and the lower magnetic conductive plate 12 are arranged in parallel, the bypass magnetic column 13 and the two middle magnetic columns 15 are both connected between the upper magnetic conductive plate 11 and the lower magnetic conductive plate 12, and the bypass magnetic column 13 and the two middle magnetic columns 15 are parallel to each other and are both vertical to the upper magnetic conductive plate 11/the lower magnetic conductive plate 12.

The two coils 15 are respectively referred to as a first coil and a second coil, and the two corresponding middle magnetic circuits are respectively referred to as a first middle magnetic pole 15 and a second middle magnetic pole 15, wherein the first coil is sleeved on the first middle magnetic pole 15, the second coil is sleeved on the first middle magnetic pole 15, and accordingly, the first coil and the second coil are preferably fixed relative to the magnetic core to improve the stability of the PFC inductor device, and herein, the combination of the first coil and the first middle magnetic pole 15 can be used as a single unit, and the combination of the second coil and the second middle magnetic pole 15 can also be used as a single unit.

For any middle magnetic column 15, the middle magnetic column 15 and the bypass magnetic column 13 are parallel and sleeved in the corresponding solenoid 15, the middle magnetic column 15 comprises more than two magnetic blocks spliced along the height direction of the middle magnetic column, an air gap is formed between the two magnetic blocks, and the value range of the air gap is (0mm, 0.6 mm).

It can be understood that in the PFC circuit in the critical continuous control mode, the switching currents at two sides in the power frequency envelope current of the PFC inductor device have high frequency, the middle part has relatively low frequency, the current peak values at two sides are small, and the current peak value at the middle part is large, and if a ferrite material is adopted here, the number of turns of the coil 15 is large, the air gap is large, and the overall volume of the PFC inductor device is large.

With the present solution, although there is also an air gap, with the same effect, this air gap is smaller than in the case of the related art in which the monolithic magnetic cores all use ferromagnetic materials. In conclusion, well magnetic pillar 15 and bypass magnetic pillar 13 all adopt metal powder, consequently this PFC inductance device can guarantee in the PFC circuit of critical continuous control mode that inductance volume diminishes when the heavy current, inductance volume increase's characteristic when the low current, and corresponding air gap can be in (0mm, 0.6 mm) get the value, and it is far less than the required air gap of ferrite material under realizing the same effect, consequently the utility model discloses a well magnetic pillar 15 is highly less to whole volume is less, and has reduced the solenoid 15 turns, in order to reduce the copper loss.

In an alternative embodiment, the relative permeability of the bypass magnetic pillar 13 and the middle magnetic pillar 15 satisfies a second formula of u1 < u2, where u1 is the relative permeability of the bypass magnetic pillar 13 and u2 is the relative permeability of the middle magnetic pillar 15. It can be understood that through the technical scheme, the critical continuous control mode PFC inductance device can be more attached to the situation that the inductance is reduced when the current is large and the inductance is increased when the current is small in the PFC circuit of the critical continuous control mode.

In an alternative embodiment, the first and second packages are each wound from a stranded copper wire, it being understood that the surface of the stranded copper wire has an insulating layer. It will be appreciated that in a PFC circuit in critical continuous control mode, the copper loss of the coil 15 of stranded copper wire is less than the copper loss of the coil 15 of single stranded copper wire, and accordingly, the core volume or length of the coil 15 can be reduced, thereby reducing the overall size of the PFC inductor device.

In an alternative embodiment, in any unit element, the cross section of the middle magnetic columns 15 may be arranged in a circle, and the axes of the two middle magnetic columns may be distributed along the length direction of the PFC inductor.

In an alternative embodiment, fig. 3 is a cross-sectional view of a PFC inductor according to an embodiment of the present application, showing the position relationship of the middle magnetic pillar and the bypass magnetic pillar. Referring to fig. 3, in any element, the cross section of the middle magnetic column 15 can be elliptical, and it can be understood that the middle magnetic column 15 in the related art is generally circular, while the area of the ellipse in the technical solution is larger than or equal to the area of the circle in the related art, and the coil 15 in the technical solution has fewer turns, thereby reducing the copper loss of the coil 15. It will be appreciated that the reduction in the number of turns allows the air gap to be reduced, thereby reducing the eddy current losses caused by the leakage flux cutting wire package 15.

Further, in any unit element, the cross section of the middle magnetic column 15 conforms to a first formula, which is: and a is more than b, wherein a is a longer half shaft of the cross section of the middle magnetic column 15 and is parallel to the width direction of the upper magnetic conduction plate 11, and b is a shorter half shaft of the cross section of the middle magnetic column 15 and is parallel to the length direction of the upper magnetic conduction plate 11. It will be appreciated that the middle magnetic pole 15 has two middle magnetic poles 15, and the two middle magnetic poles 15 are arranged along the length direction of the PFC inductor, whereas there are four increments if the longer half axis is adjusted along the length direction of the PFC inductor, and correspondingly there are two increments if the longer half axis is adjusted along the width direction of the PFC inductor. Thus. By the technical scheme, the PFC inductance device with a smaller volume can be obtained.

In an alternative embodiment, as shown with reference to fig. 3, the bypass magnetic stud 13 has a first side facing the first coil and a second side facing the second coil. The first and second sides are curved and adapted to the shape of the corresponding coil 15. Taking the first side surface as an example, when the cross section of the middle magnetic pillar 15 is circular, the first side surface is arc-shaped at the cross section of the bypass magnetic pillar 13 and is concentric with the cross section of the middle magnetic pillar 15, and when the cross section of the middle magnetic pillar 15 is elliptical, the first side surface is elliptical arc-shaped at the cross section of the bypass magnetic pillar 13 and is concentric with the cross section of the middle magnetic pillar 15. Through this technical scheme, the area of first side and second side has been increased to do benefit to this bypass magnetic column 13 and dispel the heat.

In an alternative embodiment, fig. 4 is a cross-sectional view of a PFC inductor according to an embodiment of the present application, showing the position relationship between the routing channel and the bypass magnetic pillar. Referring to fig. 1 and 4, the bypass magnetic pillar 13 is provided with a routing channel 16, a connecting wire is arranged in the routing channel 16, one end of the connecting wire is connected with the first wire package, and the other end of the connecting wire is connected with the second wire package. Through the technical scheme, the PFC inductance device can be prevented from being connected with the wiring through the welding points on the PCB, so that extra loss caused by the welding points is reduced.

Further, the routing channel 16 is communicated from the side of the bypass pillar 13 facing the first coil to the side of the bypass pillar 13 facing the second coil, so as to facilitate the processing of the magnetic core.

Furthermore, the connecting lead adopts a lead formed by connecting any outgoing terminal of the first wire packet and the corresponding outgoing terminal of the second wire packet. It can be understood that the PFC inductor device has 4 outgoing terminals, and two corresponding outgoing terminals are connected to serve as a connecting wire, so that the cost can be reduced, and the processing difficulty can be reduced. The trace channel 16 preferably extends along the length of the PFC inductor device to facilitate connection of two outlet terminals.

Furthermore, the winding directions of the first coil and the second coil are opposite, and the outgoing directions are the same. The outgoing direction is recorded as that the outgoing terminals are led out from one side face of the PFC inductance device, correspondingly, the outgoing terminal positioned above in the first wire packet corresponds to the outgoing terminal positioned above in the second wire packet, and the outgoing terminal positioned below in the first wire packet corresponds to the outgoing terminal positioned below in the second wire packet so as to be convenient for a worker to select after identification.

Furthermore, the outlet terminal above the first wire package and the outlet terminal above the second wire package are equal in height and equal in height to the wiring channel 16, so that in the process of assembling the PFC inductor device, one outlet terminal can directly penetrate through the wiring channel 16 and be connected with the corresponding outlet terminal, thereby facilitating processing and reducing bending of stranded copper wires. Of course, the outlet form may also be located at both sides of the lower magnetic conductive plate, where the fixed form is not limited, depending on the actual requirement.

The embodiment also provides a current critical continuous control type PFC circuit. Specifically, the PFC inductor device shown in any of the above embodiments is adopted in the current critical continuous control PFC circuit, and since the current critical continuous control PFC circuit is the prior art, details are not described herein, it can be understood that the PFC inductor device can also be applied to a BUCK filter circuit and the like.

This application uses specific words to describe embodiments of the application. Reference throughout this specification to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic described in connection with at least one embodiment of the present application is included in at least one embodiment of the present application. Therefore, it is emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are all within the protection scope of the present invention.

Claims

1. The PFC inductance device is characterized by comprising a ferrite component, a metal powder component, a bypass magnetic column and two coils, wherein the ferrite component comprises an upper magnetic conduction plate and a lower magnetic conduction plate, and the metal powder component comprises two middle magnetic columns;

2. The PFC inductor apparatus of claim 1, wherein the relative permeability of the bypass magnetic leg and the middle magnetic leg satisfies a second formula, the second formula being u1 < u2, wherein u1 is the relative permeability of the bypass magnetic leg and u2 is the relative permeability of the middle magnetic leg.

3. The PFC inductor apparatus of claim 1, wherein the coil is wound from stranded copper wire.

4. The PFC inductor apparatus of claim 1, wherein the center pole has an elliptical cross-section.

5. The PFC inductance device of claim 4, wherein a cross-section of the middle magnetic column conforms to a first formula, the first formula being: and a is more than b, wherein a is a long half shaft of the cross section of the middle magnetic column and is parallel to the width direction of the upper magnetic conductive plate, and b is a short half shaft of the cross section of the middle magnetic column and is parallel to the length direction of the upper magnetic conductive plate.

6. The PFC inductance device according to any one of claims 1 to 5, wherein two coils are respectively denoted as a first coil and a second coil, the bypass magnetic column is provided with a wiring channel, a connecting wire is arranged in the wiring channel, one end of the connecting wire is connected with the first coil, and the other end of the connecting wire is connected with the second coil.

7. The PFC inductance device of claim 6, wherein the routing channel communicates from the bypass post toward a side of the first coil to the bypass post toward a side of the second coil.

8. The PFC inductance device according to claim 7, wherein the connection wire is formed by connecting any outlet terminal of the first wire packet with a corresponding outlet terminal of the second wire packet.

9. A PFC circuit of the current critical continuous control type, characterized in that the PFC inductor device of any one of claims 1 to 8 is used.