Shielding type audio transformer

Abstract

The utility model relates to a shielding type audio transformer which comprises a shell with an opening in the top, a sealing plate is arranged at the opening of the shell, and a plurality of pins are arranged on the sealing plate. A shielding cover made of a polymer conductive material is embedded in the shell, a body is arranged in the shielding cover, and the pins are electrically connected with the body; a gap between the body and the shielding case is filled with epoxy resin. Double shielding is realized through the shielding cover and the shell; therefore, external electromagnetic waves are prevented from entering the audio transformer to influence the work of the audio transformer, and the electromagnetic waves generated by the audio transformer during work can be prevented from impressing electronic components around the audio transformer.

Description

Technical Field

[0001] The utility model relates to the technical field of audio transformers, in particular to a shielded audio transformer. Background Art

[0002] An audio transformer is a transformer that works in the audio range, also known as a low-frequency transformer. Its operating frequency range is generally from 10 to 20,000 Hz and is often used to transform voltage or load impedance.

[0003] Audio transformers are used in radio communications, broadcast television, and automatic control as components for voltage amplification and power output circuits. Audio transformers offer a uniform frequency response within their operating frequency band. Their cores are constructed of laminated, highly permeable materials, and their primary and secondary windings are tightly coupled. This ensures that nearly all magnetic flux passing through the primary winding is connected to the secondary winding, resulting in a coupling coefficient close to 1. The lowest frequency of the passband is determined by the primary winding inductance, while the highest frequency is determined by the transformer's leakage inductance. To ensure a sufficient passband, the primary winding inductance should be high and the leakage inductance low. Hysteresis losses in the core and magnetic circuit saturation can cause signal distortion. Proper load configuration and increased load current can mitigate the effects of hysteresis losses. Increasing the core cross-section and providing air gaps prevent magnetic circuit saturation, thereby reducing signal distortion.

[0004] The above-mentioned effect of reducing signal distortion is achieved only by improving the internal material and structure. However, since current audio transformers either have no casing or generally use plastic casings, iron casings, etc., although the cost is low, the anti-electromagnetic interference effect is poor. Due to different actual application scenarios, for example, a large number of electronic devices that are prone to generating electromagnetic interference signals are arranged near the audio transformer, more or less signal distortion will still occur and cannot be completely suppressed, making it difficult to apply to occasions with high requirements for audio signal output. Utility Model Content

[0005] The purpose of the utility model is to provide a shielded audio transformer to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned object, the technical solution adopted by the present invention is: a shielded audio transformer, comprising a shell with an opening at the top, a sealing plate provided at the opening of the shell, and a plurality of pins provided on the sealing plate; a shielding cover made of a polymer conductive material is embedded in the shell, a body is provided in the shielding cover, and the pins are electrically connected to the body; and the gap between the body and the shielding cover is filled with epoxy resin.

[0007] Compared with the existing technology, the double shielding of the shielding cover and the shell prevents external electromagnetic waves from entering the audio transformer and affecting the operation of the audio transformer. At the same time, it also prevents the electromagnetic waves generated by the audio transformer during operation from affecting the electronic components around the audio transformer.

[0008] The utility model is an improvement of the shielded audio transformer. The body comprises a frame and an iron core inserted in the frame. The body is fixedly connected to a sealing plate. A coil is wound on the outer surface of the frame, and the pins are electrically connected to the coil.

[0009] The utility model is an improvement of the shielded audio transformer. A winding column is provided on the skeleton. A front baffle and a rear baffle are provided at both ends of the winding column. A winding groove is provided between the front baffle and the rear baffle, and the coils are all wound in the winding groove; an insertion hole is provided on the winding column along the axial direction, and the iron core is inserted into the insertion hole.

[0010] The utility model is an improvement of the shielded audio transformer. One side of the front baffle and the rear baffle are both provided with pin seats. The two pin seats are symmetrically arranged and located on both sides of the winding groove. The sealing plate is connected to the pin seats.

[0011] The utility model is an improvement of the shielded audio transformer. A plurality of steps are arranged on the side of the pin seat. The steps are recessed into the pin seat or extend outward from the pin seat. A through hole is provided on the step, and an L-shaped pin is inserted into the through hole.

[0012] Compared with the prior art, the limiting rod contacts the surface of the step, thereby preventing the pins from falling off the pin holder and improving the stability between the pins and the pin holder.

[0013] The utility model is an improvement of the shielded audio transformer. The pins include a limiting rod and a connecting rod. The connecting rod is inserted into the through hole and passes through the sealing plate. The limiting rod abuts against the surface of the step and is fixedly connected to the coil on the winding column.

[0014] The utility model is an improvement of the shielded audio transformer. At least one threading hole is provided between two adjacent steps. The connection terminals of the coil pass through different threading holes and are fixedly connected to the limiting rod.

[0015] Compared with the prior art, the wiring terminals of the coil pass through different wire-threading holes and are fixedly connected to the limiting rod by welding, thereby ensuring that two adjacent wiring terminals do not intersect in the winding groove.

[0016] The utility model provides an improvement on the shielded audio transformer. The cross-sectional shape of the through hole is circular or multi-deformed, and the cross-sectional shape of the connecting rod is the same as that of the through hole.

[0017] In addition to the technical problems solved by the present invention, the technical features that constitute the technical solutions, and the advantages brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the present invention, other technical features included in the technical solutions, and the advantages brought about by these technical features will be further described in detail in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional schematic diagram of the present utility model.

[0019] Figure 2 It is a three-dimensional explosion schematic diagram of the utility model.

[0020] Figure 3 It is a three-dimensional schematic diagram of the main body of the utility model.

[0021] Explanation of the accompanying figures: 01. Shell, 02. Sealing plate, 03. Pin, 04. Shielding cover, 05. Threading hole, 06. Frame, 07. Winding column, 08. Front baffle, 09. Rear baffle, 10. Winding groove, 11. Inserting hole, 12. Pin seat, 13. Step, 14. Limit rod, 15. Connecting rod. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0023] like Figure 1-3 As shown in the figure, the shielded audio transformer of the present invention comprises a metal housing 01 with an open top. A sealing plate 02 is provided at the opening of the housing 01. Sealing plate 02 is a resin plate with a plurality of pins 03 disposed on sealing plate 02. When fixed to a PCB, pins 03 are inserted into pinholes on the PCB and secured to the PCB by soldering.

[0024] like Figure 2 As shown, a shielding cover 04 is embedded within the housing 01. The outer surface of the shielding cover 04 abuts the interior of the housing 01. The gap between the shielding cover 04 and the housing 01 is filled with epoxy resin, which utilizes the adhesive properties of the epoxy resin to secure the shielding slot to the housing 01. The shielding cover 04 is made of a conductive polymer material. This provides dual shielding through the shielding cover 04 and the housing 01. This prevents external electromagnetic waves from entering the audio transformer and affecting its operation. It also prevents electromagnetic waves generated by the audio transformer from affecting surrounding electronic components.

[0025] The main body is disposed within the shielding cover 04, and the gap between the main body and the shielding cover 04 is filled with epoxy resin. The main body includes a skeleton 06 and an iron core inserted into the skeleton 06. The main body and the sealing plate 02 are fixedly connected by adhesive or fasteners. The skeleton 06 is injection molded using nylon or other materials. A coil is wound around the outer surface of the skeleton 06. The coil includes a primary coil and a secondary coil, and the pins 03 on the sealing plate 02 are electrically connected to the coils respectively. The entire main body is located within the shielding cover 04, so that the audio transformer has the ability to shield electromagnetic waves.

[0026] like Figure 3 As shown, a winding column 07 is mounted on the frame 06. A front baffle 08 and a rear baffle 09 are mounted at each end of the winding column 07. The front baffle 08 and the rear baffle 09 are integrally connected to the winding column 07. A winding groove 10 is provided between the front baffle 08 and the rear baffle 09. Both the primary and secondary coils are wound within the winding groove 10. A through hole 11 is provided along the axis of the winding column 07. The iron core is inserted into the through hole 11.

[0027] Pin holders 12 are provided on one side of both the front baffle 08 and the rear baffle 09. These two pin holders 12 are symmetrically arranged and wrap around both sides of the slot 10. The cover 02 is connected to the pin holders 12. Several steps 13 are arranged on the sides of the pin holders 12, recessed into the pin holders 12 or extending outward from the pin holders 12. Steps 13 are provided with through-holes, with the axes of the through-holes perpendicular to the axes of the through-holes 11. The cross-section of the through-holes is circular or multi-faceted. The cross-section of the through-holes is preferably polygonal, such as triangular or quadrilateral, and L-shaped pins 03 are inserted into the through-holes.

[0028] Pin 03 includes a limiting rod 14 and a connecting rod 15 formed by bending, and the cross-sectional shape of the connecting rod 15 is the same as the cross-sectional shape of the through hole. The cross-sectional shapes of the through hole and the connecting rod 15 are both polygonal designs to prevent pin 03 from rotating in the through hole. The connecting rod 15 is inserted into the through hole and passes through the sealing plate 02 to be connected to the PCB board, while the limiting rod 14 abuts against the surface of the step 13 and is fixedly connected to the coil on the winding column 07 by welding. Pin 03 is designed to be L-shaped. When a pulling force is applied to the connecting rod 15, the limiting rod 14 abuts against the surface of the step 13. This prevents pin 03 from falling off the pin holder 12. The stability between pin 03 and the pin holder 12 is ensured.

[0029] At least one wire threading hole 05 is provided between two adjacent steps 13. In the present application, two wire threading holes 05 are provided between two adjacent steps 13. The wiring terminals of the coil in the winding groove 10 are fixedly connected to the limiting rod 14 through different wire threading holes 05 by welding, ensuring that the two adjacent wiring terminals do not intersect in the winding groove 10. For example, the two wiring terminals of the secondary coil are welded to different limiting rods through different wire threading holes. This ensures that the two wiring terminals of the secondary coil do not intersect. Similarly, the two wiring terminals of the primary coil are also the same.

[0030] It should be noted that, for the sake of clarity of description, the fasteners described in this application are any one of screws, bolts, and screws.

[0031] If the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), such directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0032] The above embodiments are merely descriptions of preferred embodiments of the present invention and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineering technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A shielded audio transformer, comprising a housing with an opening at the top, a sealing plate provided at the opening of the housing, and a plurality of pins provided on the sealing plate; characterized in that: A shielding cover made of high polymer conductive material is embedded in the shell, a body is arranged in the shielding cover, and the pins are electrically connected to the body; the gap between the body and the shielding cover is filled with epoxy resin.

2. The shielded audio transformer according to claim 1, characterized in that: The body includes a frame and an iron core inserted in the frame, and the body is fixedly connected to the sealing plate; a coil is wound on the outer surface of the frame, and the pins are electrically connected to the coil.

3. The shielded audio transformer according to claim 2, wherein: A winding column is provided on the frame, and a front baffle and a rear baffle are provided at both ends of the winding column. A winding groove is provided between the front baffle and the rear baffle, and the coils are all wound in the winding groove; an insertion hole is provided on the winding column along the axial direction, and the iron core is inserted in the insertion hole.

4. The shielded audio transformer according to claim 3, wherein: One side of the front baffle and the rear baffle is provided with a pin seat, the two pin seats are symmetrically arranged and located on both sides of the winding groove, and the sealing plate is connected to the pin seat.

5. The shielded audio transformer according to claim 4, characterized in that: A plurality of steps are arranged on the side of the pin seat, and the steps are recessed into the pin seat or extended outward from the pin seat; a through hole is provided on the step, and an L-shaped pin is inserted into the through hole.

6. The shielded audio transformer according to claim 5, characterized in that: The pin includes a limiting rod and a connecting rod. The connecting rod is inserted into the through hole and passes through the sealing plate. The limiting rod abuts against the surface of the step and is fixedly connected to the coil on the winding column.

7. The shielded audio transformer according to claim 6, characterized in that: At least one threading hole is provided between two adjacent steps, and the wiring ends of the coil pass through different threading holes and are fixedly connected to the limiting rod.

8. The shielded audio transformer according to claim 7, characterized in that: The cross-sectional shape of the through hole is circular or deformed, and the cross-sectional shape of the connecting rod is the same as the cross-sectional shape of the through hole.

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