CN214848128U

CN214848128U - Low-leakage-current small-arc driving transformer

Info

Publication number: CN214848128U
Application number: CN202121122804.0U
Authority: CN
Inventors: 柯云; 李超超; 王建忠; 胡记伟; 曹丽月; 罗丽娟
Original assignee: Changxing Huaqiang Electron Co ltd
Current assignee: Changxing Huaqiang Electron Co ltd
Priority date: 2021-05-25
Filing date: 2021-05-25
Publication date: 2021-11-23
Anticipated expiration: 2031-05-25

Abstract

The utility model relates to the technical field of transformers, in particular to a low-leakage-current small-arc driving transformer, which comprises a bakelite framework, a conductive coil, a shielding copper foil, insulating paint, a ferrite magnetic core, a lead-out wire and an insulating adhesive tape; the conductive coil is sleeved on the bakelite framework, and the ferrite magnetic core is fixedly arranged outside the bakelite framework; the ferrite magnetic core is in insulation connection with the bakelite framework through insulating paint; the insulating adhesive tape is coated outside the ferrite magnetic core; the insulating tape is wound by a shielding copper foil; the outgoing line is exposed and connected with the PCB after sequentially penetrating through the ferrite magnetic core and the bakelite framework. The low-leakage-current small-arc driving transformer increases creepage distance, no arc phenomenon occurs between primary and secondary sides of the transformer, leakage current in a withstand voltage test can reach 0.2mA Max, no short circuit risk exists between the primary and secondary sides of a product, and the use safety performance of the product is obviously improved.

Description

Low-leakage-current small-arc driving transformer

Technical Field

The utility model belongs to the technical field of the technique of transformer and specifically relates to a little electric arc driving transformer of low leakage current.

Background

With the continuous development of society, the electrical industry has been rapidly developed. In the electrical industry, a variety of transformers are frequently used, wherein low leakage current, small arc driving transformers are important components. The framework of the low-leakage-current small-arc driving transformer can be stably used, the framework for the low-leakage-current small-arc driving transformer is a common framework structure at present, and wiring terminal pins or flying leads are generally required to be installed for subsequent wave soldering operation in the actual use process; therefore, the original framework is required to be processed with the insulating clamping seat to realize the fixed installation of the transformer, so that the processing is complicated, the die sinking cost is high, and the strength of the framework is greatly influenced; in the in-service use process, the effect is also not ideal in insulating isolation, hardly reaches the effect that increases creepage distance and improves the leakage current, leads to electric arc great technical safety problem appearing easily, and cassette protrusion skeleton also does not make things convenient for its processing and transportation in addition, and the in-service use of giving people has brought very big inconvenience.

Disclosure of Invention

The to-be-solved technical problem of the utility model is: in order to solve the problems existing in the background technology, the low-leakage-current small-arc driving transformer is provided, the creepage distance is increased, no arc phenomenon occurs between the primary level and the secondary level of the transformer, the leakage current in a withstand voltage test can reach 0.2mA Max, no short circuit risk exists between the primary level and the secondary level of a product, and the use safety performance of the product is obviously improved.

The utility model provides a technical scheme that its technical problem adopted is: a low leakage current small arc driving transformer is characterized in that: the insulation structure comprises a bakelite framework, a conductive coil, shielding copper foil, insulation paint, a ferrite magnetic core, a lead-out wire and an insulation adhesive tape; the conductive coil is sleeved on the bakelite framework, and the ferrite magnetic core is fixedly arranged outside the bakelite framework; the ferrite magnetic core is in insulation connection with the bakelite framework through insulating paint; the insulating adhesive tape is coated outside the ferrite magnetic core; the insulating tape is wound by a shielding copper foil; the outgoing line is exposed and connected with the PCB after sequentially penetrating through the ferrite magnetic core and the bakelite framework.

Further, in the above technical solution, the bakelite framework comprises a framework and pins, the cross section of the framework is a dumbbell-shaped structure, the upper end surface of the framework is provided with a lead groove, and the pins are arranged on the lower end surface of the framework; the pins and the soldering leads are convenient for the connection between the transformer component and the PCB through wave soldering, and the output effect meeting the design requirement is achieved after the circuit is conducted.

Further, in the above technical solution, the conductive coil includes a primary winding and a secondary winding; the wire diameter of the conductive coil is calculated according to the rated working current, the coil ratio is calculated according to the voltage ratio of the transformer and the output efficiency of the product, the windings are isolated by using an insulating tape to avoid short circuit, and the energy conversion effect is achieved through the winding coil.

Further, in the above technical solution, the shielding copper foil includes a first shielding copper foil and a second shielding copper foil; the first shielding copper foil and the second shielding copper foil are wound on the ferrite magnetic core in a cross manner; such a design may be used to shield external electric fields to improve EMI and noise.

Further, in the above technical solution, the ferrite core is formed by two E-shaped cores in a butt joint manner, an air gap is formed between butt joint ends of center pillars of the two E-shaped cores, no air gap is formed between butt joint ends of side pillars of the two E-shaped cores, the ferrite core generates an electromagnetic field after being electrified and forms a closed loop, and a design output effect is achieved through an electromagnetic induction technology.

The utility model has the advantages that: the utility model provides a low leakage current small arc driving transformer, improve the creepage distance of relevant components and parts through the novel sticky tape mode of needle 1-5 foot sides, there is not electric arc phenomenon to take place between the transformer primary level, withstand test leakage current can reach 0.2mA Max, so there is not short circuit risk between the product primary level, product safety in utilization can be obviously promoted, simple structure simultaneously, adopt integral type skeleton texture, can reduce whole processing cost and manufacturing procedure when guaranteeing the transformer stable use, improve whole production efficiency, the new product has the splendid safe creepage distance, be favorable to the miniaturized development direction of high-power product, can effectively protect other key components and parts products in the circuit, avoid the potential risk of PCB board burning damage under the long-term operating condition, the product safety performance is better, be favorable to the miniaturized market development direction of European style socket, the demand of customers is large, and the market prospect is good.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is a schematic top view of fig. 1.

The reference numbers in the drawings are: 1. bakelite framework, 2, conductive coil, 3, shielding copper foil, 4, ferrite core, 5, lead-out wire, 6, insulating tape, 7, framework, 8, pin, 9 and lead groove.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to further explain the present invention in 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.

In fig. 1 and 2, the black part shows that a non-transparent sleeve is adopted, and the transparent part shows that a transparent sleeve is adopted to sleeve and connect.

Referring to fig. 1 and 2, a low leakage current and small arc driving transformer is shown, which comprises a bakelite framework 1, a conductive coil 2, a shielding copper foil 3, insulating paint, a ferrite magnetic core 4, an outgoing line 5 and an insulating adhesive tape 6; the conductive coil 2 is sleeved on the bakelite framework 1, and the ferrite magnetic core 4 is fixedly arranged outside the bakelite framework 1; the ferrite magnetic core 4 is in insulation connection with the bakelite framework 1 through insulating paint; the insulating tape 6 is coated outside the ferrite core 4; the insulating tape 6 is wound by the shielding copper foil 3; the outgoing line 5 is exposed and connected with the PCB after sequentially passing through the ferrite magnetic core 4 and the bakelite framework 1.

Wherein, bakelite skeleton 1 includes skeleton 7 and stitch 8, and the skeleton 7 cross-section is dumbbell-shaped structure, and skeleton 7 up end sets up lead wire groove 9, and stitch 8 sets up on skeleton 7 lower extreme face. The conductive coil 2 includes a primary winding and a secondary winding. The shielding copper foil 3 comprises a first shielding copper foil and a second shielding copper foil; the first shielding copper foil and the second shielding copper foil are wound on the ferrite core 4 in a crisscross manner. The ferrite magnetic core 4 is formed by butt joint of two E-shaped magnetic cores, an air gap is formed between butt joint ends of center pillars of the two E-shaped magnetic cores, no air gap is formed between butt joint ends of side pillars of the two E-shaped magnetic cores, the ferrite magnetic core 4 generates an electromagnetic field after being electrified and forms a closed loop, and the designed output effect is achieved through an electromagnetic induction technology.

The low-leakage-current small-arc driving transformer has the following advantages compared with the traditional transformer:

this application has increased its creepage distance through insulating adhesive tape 6 complete isolation transformer's conductive coil 2, makes no electric arc phenomenon take place again between the transformer conductive coil 2, and withstand voltage test leakage current can reach 0.2mA, and the product is primary does not have the short circuit risk, and product safety in utilization can obviously be promoted.

The above-mentioned, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. A low leakage current small arc driving transformer is characterized in that: the insulation structure comprises a bakelite framework, a conductive coil, shielding copper foil, insulation paint, a ferrite magnetic core, a lead-out wire and an insulation adhesive tape; the conductive coil is sleeved on the bakelite framework, and the ferrite magnetic core is fixedly arranged outside the bakelite framework; the ferrite magnetic core is in insulation connection with the bakelite framework through insulating paint; the insulating adhesive tape is coated outside the ferrite magnetic core; the insulating tape is wound by a shielding copper foil; the outgoing line is exposed and connected with the PCB after sequentially penetrating through the ferrite magnetic core and the bakelite framework.

2. The low leakage current small arc driving transformer of claim 1, wherein: the bakelite framework comprises a framework and pins, the cross section of the framework is of a dumbbell-shaped structure, the upper end face of the framework is provided with a lead groove, and the pins are arranged on the lower end face of the framework.

3. The low leakage current small arc driving transformer of claim 1, wherein: the conductive coil includes a primary winding and a secondary winding.

4. The low leakage current small arc driving transformer of claim 1, wherein: the shielding copper foil comprises a first shielding copper foil and a second shielding copper foil; the first shielding copper foil and the second shielding copper foil are wound on the ferrite magnetic core in a cross mode.

5. The low leakage current small arc driving transformer of claim 1, wherein: the ferrite magnetic core is formed by butt joint of two E-shaped magnetic cores, an air gap is formed between butt joint ends of center pillars of the two E-shaped magnetic cores, no air gap is formed between butt joint ends of side pillars of the two E-shaped magnetic cores, the ferrite magnetic core generates an electromagnetic field after being electrified and forms a closed loop, and the designed output effect is achieved through an electromagnetic induction technology.