CN210606903U

CN210606903U - EFD type switching transformer

Info

Publication number: CN210606903U
Application number: CN201922219151.7U
Authority: CN
Inventors: 陈宣新; 卓宗辉
Original assignee: Yueqing Precision Electronic And Electrical Appliance Co ltd
Current assignee: Yueqing Precision Electronic And Electrical Appliance Co ltd
Priority date: 2019-12-12
Filing date: 2019-12-12
Publication date: 2020-05-22
Anticipated expiration: 2029-12-12

Abstract

The utility model relates to a transformer technical field, concretely relates to EFD type switch transformer. The utility model discloses a skeleton, magnetic core, enameled wire, sticky tape, the magnetic core adopts standard EFD type magnetic core, be equipped with primary winding groove, magnetic core groove, secondary winding groove in the middle of the skeleton in proper order, magnetic core groove, primary winding groove, secondary winding groove are and communicate with each other and are the cavity form, be equipped with left opening on the left end of skeleton, be equipped with the right-hand member opening on the right-hand member of skeleton, left side opening communicates with each other with primary winding groove, right side opening communicates with each other with secondary winding groove, the magnetic core is installed in the magnetic core inslot, primary winding inslot installation enameled wire and magnetic core twine mutually and constitute primary, secondary winding inslot installation enameled wire and magnetic core twine mutually and constitute secondary.

Description

EFD type switching transformer

Technical Field

The utility model relates to a transformer technical field, concretely relates to EFD type switch transformer.

Background

A Transformer (Transformer) is a device that changes an alternating voltage by using the principle of electromagnetic induction, and main components are a primary coil, a secondary coil, and a magnetic core. The common power frequency transformer has the working frequency of 50Hz-60Hz on the basis of the 220V frequency of alternating current of 50Hz-60Hz, but the power frequency transformer has low working frequency and low conversion efficiency, and a high-power frequency transformer needs a large magnetic core, so that the size is large, and the output current is unstable.

The switching transformer is generally a transformer used in a switching power supply, and works in a pulse state with a frequency of tens of to tens of thousands of Hz or even hundreds of thousands of Hz, and an iron core is generally made of ferrite materials. The switch transformers are mainly classified into models of EE, EFD, ER, EC, ETD, EFD, PQ, RM and the like, the EFD switch transformers are most suitable for the requirement of flattening, and the requirements of various electrical and electronic equipment on the switch transformers are more and more at present.

At present, conventional switch transformers on the market are protected by only thin winding outside without a shell.

SUMMERY OF THE UTILITY MODEL

In order to overcome the not enough of background art, the utility model provides an EFD type on-off transformer.

The technical scheme of the utility model is that: the magnetic core is a standard EFD type magnetic core, a primary winding groove, a magnetic core groove and a secondary winding groove are sequentially arranged in the middle of the framework, the magnetic core groove, the primary winding groove and the secondary winding groove are communicated and are hollow, a left opening is formed in the left end of the framework, a right opening is formed in the right end of the framework, the left opening is communicated with the primary winding groove, the right opening is communicated with the secondary winding groove, the magnetic core is installed in the magnetic core groove, an enameled wire is installed in the primary winding groove, the enameled wire and the magnetic core are wound mutually to form a primary winding, an enameled wire and the magnetic core are installed in the secondary winding groove to form a secondary winding, a primary stitch is installed at the left end of the framework, a secondary stitch is installed at the right end of the framework, the primary stitch is connected with the primary winding, and the secondary stitch is connected with the secondary winding, install the visor on the skeleton, the visor covers left opening and right opening, the sticky tape winding prevents on skeleton and the protective cover that the visor from deviating from.

Preferably, the secondary winding is divided into a first secondary winding, a second secondary winding, a third secondary winding and a fourth secondary winding, the primary pin is 6 pins, the secondary pin is 7 pins, and the first secondary winding, the second secondary winding, the third secondary winding and the fourth secondary winding are respectively connected to different pins of the secondary pin.

Preferably, the joint of the magnetic core and the framework is fixed by dispensing.

Preferably, a groove is formed in the middle of the protective cover, the spatial positions of the magnetic core groove, the primary winding groove and the secondary winding groove are framework main bodies, and the size of the groove and the external dimension of the framework main bodies are matched with each other.

Preferably, two circles of reinforcing ribs are installed on the framework main body, the framework main body is divided into three spaces of the magnetic core groove, the primary winding groove and the secondary winding groove by the two circles of reinforcing ribs, inward protruding positioning rings are arranged in the grooves, and the positioning rings are located between the two circles of reinforcing ribs and are installed in a matched mode.

Preferably, the retaining ring consists of two inner rings with the same wall thickness as the wall thickness of the main body of the protective cover.

Preferably, the magnetic core is made of ferrite, the framework is made of phenolic resin, and the protective cover is made of PBT.

Preferably, the material of the magnetic core is ferrite PC40, the specific model of the magnetic core is EFD38, the material of the framework is phenolic resin PM9820, and the material of the protective cover is PBT 4115.

Preferably, the material of the framework is phenolic resin T375HF, and the material of the protective cover is PA 66.

Preferably, the framework and the protective cover have a fire rating of 94V-0.

Preferably, the magnetic core and the enameled wire in the framework are both soaked in insulating paint.

The beneficial effects of the utility model are that guaranteeing the output list and pressing under the speed of working hard with power, improved switching transformer's intensity, life, it is small.

Drawings

Fig. 1-4 are schematic structural views of the present invention.

Fig. 5 is a front view of the framework of the present invention.

Fig. 6 is a top view of the framework of the present invention.

Fig. 7 is a right side view of the framework of the present invention.

Fig. 8 is a front view of the protective cover of the present invention.

Fig. 9 is a top view of the protective cover of the present invention.

Fig. 10 is a circuit connection diagram of the present invention.

In fig. 1 to 10, a bobbin 1, a left end 101, a left opening 1011, a right opening 1021, a right end 102, a magnetic core slot 11, a primary winding slot 12, a secondary winding slot 13, a reinforcing rib 14, a bobbin main body 15, a magnetic core 2, a protective cover 3, a groove 31, a positioning ring 32, an enameled wire 4, a primary pin5, a secondary pin 6, an adhesive tape 7, a primary winding Np, a secondary winding Ns, a first secondary winding Ns1, a second secondary winding Ns2, a third secondary winding Ns3 and a fourth secondary winding Ns 4.

Detailed Description

Embodiments of the invention are further described below with reference to the accompanying drawings:

as shown in fig. 1 to 10, the present embodiment provides an EFD type switching transformer, which includes a frame 1, a magnetic core 2, an enamel wire 4, and an adhesive tape 7, wherein the magnetic core 2 is a standard EFD type magnetic core, a primary winding slot 12, a magnetic core slot 11, and a secondary winding slot 13 are sequentially disposed in the middle of the frame 1, the magnetic core slot 11, the primary winding slot 12, and the secondary winding slot 13 are all communicated and hollow, a left opening 1011 is disposed on a left end 101 of the frame 1, a right opening 1021 is disposed on a right end 102 of the frame 1, the left opening 1011 is communicated with the primary winding slot 12, the right opening 1021 is communicated with the secondary winding slot 13, the magnetic core 2 is disposed in the magnetic core slot 11, the enamel wire 4 is disposed in the primary winding slot 12, the enamel wire 4 and the magnetic core 2 are wound together to form a primary winding Np, the enamel wire 4 and the magnetic core 2 are wound together in the secondary winding slot 13 to form a, the left end 101 of the framework 1 is provided with a primary pin5, the right end 102 of the framework 1 is provided with a secondary pin 6, the primary pin5 is connected with a primary winding Np, the secondary pin 6 is connected with a secondary winding Ns, the framework 1 is provided with a protective cover 3, the protective cover 3 covers a left opening 1011 and a right opening 1021, and the adhesive tape 7 is wound on the framework 1 and the protective cover 3 to prevent the protective cover 3 from being separated.

The magnetic core 2, the primary winding Np, the secondary winding Ns and the like are well sealed in the inner end through the protective cover 3, so that the switch transformer is well protected, and meanwhile, the strength and the service life of the switch transformer are improved. At the same time, the volume of the EFD signal switch transformer is only 47.5mm 41mm 15 mm.

Preferably, the secondary winding Ns is divided into a first secondary winding Ns1, a second secondary winding Ns2, a third secondary winding Ns3 and a fourth secondary winding Ns4, the primary pin5 is 6 pins, the secondary pin 6 is 7 pins, and the first secondary winding Ns1, the second secondary winding Ns2, the third secondary winding Ns3 and the fourth secondary winding Ns4 are respectively connected to different pins of the secondary pin 6.

In order to prevent the magnetic core 2 from being displaced in the magnetic core slot 11 of the framework 1, the connection between the magnetic core 2 and the framework 1 is preferably fixed by dispensing.

In order to make the protective cover 3 be better matched and connected with the framework 1, preferably, a groove 31 is formed in the middle of the protective cover 3, the spatial positions of the magnetic core slots 11, the primary winding slots 12 and the secondary winding slots 13 are framework main bodies 15, and the size of the groove 31 is matched with the external size of the framework main body 15.

The strength of the framework 1 is enhanced, the protective cover 3 and the framework 1 are convenient to position and install, preferably, two circles of reinforcing ribs 14 are installed on the framework main body 15, the framework main body 15 is divided into three spaces including the magnetic core groove 11, the primary winding groove 12 and the secondary winding groove 13 by the two circles of reinforcing ribs 14, an inward protruding positioning ring 32 is arranged in the groove 31, and the positioning ring 32 is located between the two circles of reinforcing ribs 14 and is installed in a matched mode.

In order to prevent the protective cover 3 from being incorrectly oriented, it is preferable that the two rings of ribs 14 and the positioning ring 32 are not located at the center line position, but at an eccentric position.

Since the framework 1 and the protection cover 3 are both injection-molded by using a mold, in order to prevent the shrinkage caused by uneven wall thickness in the injection molding process, and finally cause the pits to appear on the surfaces of the framework 1 and the protection cover 3, preferably, the positioning ring 32 is composed of two inner rings with the same wall thickness as the wall thickness of the main body of the protection cover 3. The same wall thickness can be adopted for faster injection molding and deformation reduction.

From the viewpoint of cost and insulation, it is preferable that the material of the magnetic core 2 is ferrite, the skeleton 1 is made of phenolic resin, and the material of the protective cover 3 is PBT.

After many tests and from the viewpoint of cost and quality, preferably, the material of the magnetic core 2 is ferrite PC40, the specific model of the magnetic core 2 is EFD38, the material of the framework 1 is phenol formaldehyde PM9820, and the material of the protective cover 3 is PBT 4115.

Of course, there are other similar excellent material schemes, the material of the framework 1 is phenolic resin T375HF, and the material of the protective cover 3 is PA 66.

Preferably, the material of the framework 1 is phenolic resin T375HF, and the material of the protective cover 3 is PA 66.

Preferably, the framework 1 and the protective cover 3 have a fire rating of 94V-0.

In order to improve the insulation performance, preferably, the magnetic core 2 and the enameled wire 4 in the framework 1 are both soaked in the insulating varnish.

Fig. 10 is a specific circuit connection diagram of the product of the present invention. The method comprises the steps of sequentially dividing 6

primary PINs

5 and 7 secondary PINs 6 into 13 PINs in total from PIN1 to PIN13, connecting a primary winding Np with a PIN2 PIN and a PIN5 PIN on the primary PIN5, removing the PIN3 PIN, connecting a first secondary winding Ns1 with a PIN12 PIN and a PIN13 PIN, connecting a second secondary winding Ns2 with a PIN11 PIN and a PIN13 PIN, connecting a third secondary winding Ns3 with a PIN8 PIN and a PIN9 PIN, and connecting a fourth secondary winding Ns4 with a PIN7 PIN and a PIN10 PIN.

Use magnetic core 2 chooses for use EFD38 model as the example, attaches the utility model discloses the test data of product below:

Id(A)	0A	0.2A	0.4A	0.6A	0.8A	1.0A	1.2A	1.4A
									25℃1#	738.2	738.5	734.5	720	695	651	578	470
100℃1#	823.7	815	805	790	761	704	582	278

the present embodiment should not be considered as a limitation of the present invention, but any modification made based on the spirit of the present invention should be within the scope of the present invention.

Claims

1. The utility model provides an EFD type switching transformer, includes skeleton (1), magnetic core (2), enameled wire (4), sticky tape (7), its characterized in that: the magnetic core (2) adopts a standard EFD type magnetic core, a primary winding groove (12), a magnetic core groove (11) and a secondary winding groove (13) are sequentially arranged in the middle of the framework (1), the magnetic core groove (11), the primary winding groove (12) and the secondary winding groove (13) are communicated and are hollow, a left opening (1011) is arranged at the left end (101) of the framework (1), a right opening (1021) is arranged at the right end (102) of the framework (1), the left opening (1011) is communicated with the primary winding groove (12), the right opening (1021) is communicated with the secondary winding groove (13), the magnetic core (2) is arranged in the magnetic core groove (11), an enameled wire (4) is arranged in the primary winding groove (12), the enameled wire (4) and the magnetic core (2) are mutually wound to form a primary winding (Np), the enameled wire (4) is arranged in the secondary winding groove (13) and the magnetic core (2) is mutually wound to form a secondary winding (Ns), elementary stitch (5) are installed to left end (101) of skeleton (1), secondary stitch (6) are installed to right-hand member (102) of skeleton (1), elementary stitch (5) link to each other with primary winding (Np), secondary stitch (6) link to each other with secondary winding (Ns), install visor (3) on skeleton (1), visor (3) cover left opening (1011) and right opening (1021), sticky tape (7) winding prevents on skeleton (1) and visor (3) that visor (3) from deviating from.

2. An EFD-type switching transformer according to claim 1, characterized in that: the secondary winding (Ns) is divided into a first secondary winding (Ns1), a second secondary winding (Ns2), a third secondary winding (Ns3) and a fourth secondary winding (Ns4), the primary pin (5) is 6 pins, the secondary pin (6) is 7 pins, and the first secondary winding (Ns1), the second secondary winding (Ns2), the third secondary winding (Ns3) and the fourth secondary winding (Ns4) are respectively connected to different pins of the secondary pin (6).

3. An EFD-type switching transformer according to claim 1, characterized in that: and the joint of the magnetic core (2) and the framework (1) is fixed by dispensing.

4. An EFD-type switching transformer according to claim 3, characterized in that: a groove (31) is formed in the middle of the protective cover (3), the space positions of the magnetic core groove (11), the primary winding groove (12) and the secondary winding groove (13) are framework main bodies (15), and the size of the groove (31) is matched with the external size of the framework main bodies (15) in installation.

5. An EFD-type switching transformer according to claim 4, characterized in that: install two rings of strengthening rib (14) on skeleton main part (15), two rings of strengthening rib (14) divide skeleton main part (15) into magnetic core groove (11), primary winding groove (12), secondary winding groove (13) three space, be equipped with inside bellied holding ring (32) in recess (31), holding ring (32) are located between two rings of strengthening rib (14) and cooperate the installation mutually.

6. An EFD-type switching transformer according to claim 5, characterized in that: the positioning ring (32) consists of two inner rings with the same wall thickness as the wall thickness of the main body of the protective cover (3).

7. An EFD-type switching transformer according to claim 1, characterized in that: the magnetic core (2) is made of ferrite, the framework (1) is made of phenolic resin, and the protective cover (3) is made of PBT.

8. An EFD-type switching transformer according to claim 7, characterized in that: the magnetic core (2) is made of ferrite PC40, the specific model of the magnetic core (2) is EFD38, the framework (1) is made of phenolic resin PM9820, and the protective cover (3) is made of PBT 4115.

9. An EFD-type switching transformer according to claim 1, characterized in that: and the magnetic core (2) and the enameled wire (4) in the framework (1) are soaked in insulating paint.