CN219457323U

CN219457323U - Transformer and bottom box power supply

Info

Publication number: CN219457323U
Application number: CN202320369310.5U
Authority: CN
Inventors: 梁伟波; 杨绍远
Original assignee: Shenzhen Oribo Technology Co Ltd
Current assignee: Shenzhen Oribo Technology Co Ltd
Priority date: 2023-03-02
Filing date: 2023-03-02
Publication date: 2023-08-01
Anticipated expiration: 2033-03-02

Abstract

The utility model discloses a transformer and a bottom box power supply, wherein the transformer comprises a framework, a winding, an EE type magnetic core and a pin assembly; winding is wound on the framework, and the EE type magnetic core is arranged on the framework in a vertical state and surrounds the winding; the windings comprise a primary winding, an auxiliary winding and a secondary winding; the pin assembly is arranged corresponding to the pins on the EPC transformer and comprises a first pin group, a second pin group and a third pin group; the first pin group and the second pin group are arranged on the first side of the framework and are respectively and electrically connected with the primary winding and the auxiliary winding; the third pin group is arranged on a second side opposite to the framework and is electrically connected with the secondary winding. The utility model adopts the EE magnetic core to increase the overall height of the transformer, increase the output power and improve the performance of the whole transformer; the SMD type non-isolated EPC17 transformer can be used on a circuit board instead of the SMD type non-isolated EPC17 transformer, and the problem of insufficient output power of the SMD type non-isolated EPC17 transformer is solved.

Description

Transformer and bottom box power supply

Technical Field

The utility model relates to the technical field of transformers, in particular to a transformer and a bottom box power supply.

Background

In the 86 type bottom box power supply structure, when the board of the 86 type bottom box power supply structure comprises a 5V 2A power supply system, a multi-path relay circuit, a singlechip control system, a safety device, a bottom box and a panel interface, if the 86 type bottom box power supply needs to realize all functions of the structure, the space of the bottom box is insufficient. In the power supply system, the transformer can only select an SMD type non-isolated EPC17 transformer because of the space limitation of a PCB, and the non-isolated transformer can withstand voltage of 3750V through special insulation treatment.

However, the SMD type non-isolated EPC17 transformer is only suitable for 5V 2a output power and 3750V withstand voltage, and when the panel needs to supply larger power or higher withstand voltage, for example, 5V 3a supply and 4000V withstand voltage, the SMD type non-isolated EPC17 transformer has insufficient output power, serious heat generation and difficult withstand voltage reaching 4000V after special insulation treatment. In addition, the transformer production process is complex, and insulation treatment such as single-side magnetic core tape wrapping and skeleton dispensing is needed, so that the process difficulty and the production labor cost are increased.

Disclosure of Invention

The utility model aims to provide an improved transformer and a bottom box power supply with the transformer.

The technical scheme adopted for solving the technical problems is as follows: providing a transformer, wherein the transformer is arranged with an EPC transformer pin to pin, and comprises a framework, a winding, an EE magnetic core and a pin assembly; the winding is wound on the framework, and the EE type magnetic core is arranged on the framework in a vertical state and encloses the winding;

the winding comprises a primary winding, an auxiliary winding and a secondary winding;

the pin assembly is arranged corresponding to a pin on the EPC transformer and comprises a first pin group, a second pin group and a third pin group; the first pin group and the second pin group are arranged on the first side of the framework and are respectively and electrically connected with the primary winding and the auxiliary winding; the third pin group is arranged on a second side opposite to the framework and is electrically connected with the secondary winding.

In one embodiment, the skeleton has a bottom surface for facing the circuit board, a top surface opposite the bottom surface; the EE-type core comprises two E-type cores;

the two E-type core bodies are respectively matched on the bottom surface and the top surface of the framework, and are respectively butted along a third side and a fourth side which are opposite on the framework to form an integrated EE-type magnetic core.

In one embodiment, the bottom surface of the framework is also provided with at least one baffle for increasing the creepage distance; the baffle is arranged between the third pin group and the EE type magnetic core in a spacing mode.

In one embodiment, two baffle plates are arranged at intervals.

In one embodiment, the height of the baffle on the bottom surface of the framework is more than or equal to 1mm.

In one embodiment, the bottom surface of the skeleton is provided with a recess for receiving one of the E-shaped cores.

In one embodiment, the EE-type core is an EE17 vertical core.

In one embodiment, the height of the transformer is 16.2mm or less.

In one embodiment, the maximum length of the transformer is 24mm and the maximum width of the transformer is 19mm.

In one embodiment, the transformer further comprises insulating tape wound around the outer circumference of the winding and the outer surface of the EE-type core, respectively.

The utility model also provides a bottom box power supply, which comprises the transformer, a closed bottom box and a circuit board, wherein the circuit board is arranged in the bottom box, and the transformer is arranged on the circuit board.

The utility model has the beneficial effects that: compared with the horizontal magnetic core of the EPC transformer, the vertical EE magnetic core is adopted to increase the overall height of the transformer, increase the output power and improve the performance of the whole transformer; the SMD type non-isolated EPC17 transformer can be replaced to be used on the circuit board, the circuit board is not required to be changed, the re-layout time of the circuit board is saved, and the problem of insufficient output power of the SMD type non-isolated EPC17 transformer is solved.

Drawings

The utility model will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a front view of a transformer according to an embodiment of the present utility model;

FIG. 2 is a side view of a transformer according to an embodiment of the utility model;

FIG. 3 is a bottom view of a transformer according to an embodiment of the utility model;

fig. 4 is a top view of a transformer according to an embodiment of the present utility model.

Detailed Description

For a clearer understanding of technical features, objects and effects of the present utility model, a detailed description of embodiments of the present utility model will be made with reference to the accompanying drawings.

As shown in fig. 1-4, a transformer according to an embodiment of the present utility model includes a bobbin 10, windings 20, an EE core 30, and a pin assembly.

Wherein, winding 20 winds on skeleton 10, and the pin subassembly sets up on skeleton 10 and is connected with winding 20 electricity. The EE-type magnetic core 30 is disposed on the bobbin 10 in a vertical state and encloses the windings 20 therein.

The transformer provided by the utility model is arranged with the EPC transformer pin to pin, namely, the functions and windings of the pin assembly of the transformer are arranged corresponding to the EPC transformer, and the transformer can be used for replacing the EPC transformer to be installed on devices such as a circuit board. The EPC transformer may be an SMD non-isolated EPC17 transformer.

Like the arrangement of the primary, auxiliary and secondary windings on an EPC transformer, the winding 20 of the transformer of the present utility model comprises the primary, auxiliary and secondary windings wound sequentially from inside to outside on the former 10. Correspondingly, the pin assembly is also identical to the three-pin arrangement on the EPC transformer, i.e. the pin assembly comprises a first pin set 41, a second pin set 42 and a third pin set 43; wherein the first set of pins 41 is electrically connected to the primary winding, the second set of pins 42 is electrically connected to the auxiliary winding, and the third set of pins 43 is electrically connected to the secondary winding.

To fit the winding 20 and the EE-type magnetic core 30, the bobbin 10 structurally includes a base 11 and a stand 12 vertically formed on the base 11, the outer circumference of the stand 12 forming a winding slot for receiving the winding 20 therein. The primary winding, the auxiliary winding and the secondary winding are sequentially wound along the outer periphery of the winding slot to form the winding slot, and the plane of the winding 20 in the winding direction is parallel to the plane of the base 11. The EE-type magnetic core 30 comprises two E-type core bodies 31, wherein the two E-type core bodies 31 are respectively formed on the frame 10 in a butt joint manner from the upper side and the lower side of the frame 10 and are positioned at the outer side of the winding 20, so that the top surface of the transformer is the surface of one E-type core body 31, is a flat surface, and can better bear the force on the SMT suction nozzle.

Specifically, the skeleton 10 may have four sides, a bottom surface and a top surface, the four sides being a first side to a fourth side, respectively, wherein the first side is opposite to the second side, and the third side is opposite to the fourth side. The bottom surface is mainly formed on the lower surface of the base 11 of the framework 10, and the top surface is formed on the top surface of the stand 12 of the framework 10.

The first pin group 41 and the second pin group 42 are disposed on a first side of the skeleton 10, specifically disposed at a lower end of the first side of the skeleton 10, that is, on one side of the base 11; the third pin group 43 is disposed on the second side of the frame 10, specifically, disposed at the lower end of the second side of the frame 10, i.e. the opposite side of the base 11. The first pin group 41 comprises two pins, the second pin group 42 also comprises two pins, and the four pins are sequentially arranged at intervals on the first side; the third pin group 43 also includes two pins arranged at intervals. Two E-shaped cores 31 are fitted on the bottom and top surfaces of the bobbin 10, respectively, and are butted along opposite third and fourth sides of the bobbin 10, respectively, to form an integral EE-shaped core 30.

To position the E-shaped core 31 fitted on the bottom surface of the skeleton 10, the bottom surface of the skeleton 10 is provided with a groove adapted to the E-shaped core 31, in which the bottom plate portion of the E-shaped core 31 is accommodated, and the side posts on both sides are abutted with the side posts of the other E-shaped core 31 along the third and fourth sides of the skeleton 10. By setting the depth and width of the groove to be identical to the thickness and width of the bottom plate portion of the E-type core 31, the main body portion of the E-type core 31 is fitted in the groove, and the outer surface of the bottom plate portion is flush with the top surface of the groove.

In one embodiment, the EE-type magnetic core 30 is an EE17 vertical magnetic core, which is a vertical widened magnetic core, and the height of a transformer formed by matching with the framework 10, the winding 20 and the like is larger than that of a transformer using a horizontal EPC17 magnetic core, so that the space in the bottom box power supply can be fully utilized, and meanwhile, the transformer has larger output power.

Each of the first to third pin groups 41 to 43 is provided outside the bobbin 10 in an L-shape or bent angle, etc., so that the transformer is easier in SMT mounting.

Further, in order to increase the creepage distance between the EE-type magnetic core 30 and the sub-component of the third pin group 43, at least one protruding baffle 13 is further provided on the bottom surface of the skeleton 10; the blocking piece 13 is arranged between the third pin group 43 and the EE type magnetic core 30 in a spaced manner. Wherein, the baffle 13 is protruded on the bottom surface of the framework 10, so that the protruded height of the baffle 13 also forms a part of the creepage distance. The height of the baffle 13 on the bottom surface of the framework 10 can be more than or equal to 1mm. For example, when the height of the barrier 13 is 1mm and the creepage distance in the horizontal direction is 6mm, the provision of the barrier 13 increases the creepage distance by 1mm.

As one embodiment, as shown in fig. 2 and 3, the bottom surface of the framework 10 is provided with blocking pieces 13 arranged at intervals, and one blocking piece 13 is close to the EE-type magnetic core 30, which increases the height of one blocking piece 13 for the creepage distance; the other blocking piece 13 is relatively close to the third pin group 43, and the heights of the two opposite sides of the blocking piece 13 are increased by the creepage distance, namely, the creepage distance is increased by two blocking piece heights. For example, the height of the barrier is set at 1mm, the horizontal distance between the EE-type core 30 and the third pin group 43 is 6mm, and the creepage distance between the two is 6mm+1mm+1mm in combination with the height of the two barrier 13, and the creepage distance is always 9mm.

Further, the transformer of the present utility model further includes insulating tapes wound around the outer circumference of the winding 20 and the outer surface of the EE-type core 30, respectively. Wherein, the insulation tape of the periphery of the winding 20 insulates the winding and the EE type magnetic core 30; the insulating tape wound on the outer surface of the EE-type core 30 is used not only for insulation between the inside of the bottom case power supply and the wiring board, but also for increasing the withstand voltage distance between the EE-type core 30 and the third pin group 43.

In summary, the transformer of the present utility model is arranged in combination with the selection of the EE-type magnetic core 30 and the frame 10, and the height of the transformer can reach 16mm or more. According to the internal space of the bottom box power supply, for example, in a 86-type bottom box power supply, the distance between the circuit board and the structural member in the bottom box is 16.5mm, the height of the transformer is controlled to be 16.2mm, namely, the height of the transformer is less than or equal to 16.2mm, and the height of a winding slot on the framework 10 where the winding 20 is positioned can be 7.5mm.

The transformer pin assembly of the utility model is the same as the pin arrangement of the SMD type non-isolated EPC17 transformer, and comprises pins corresponding to a primary winding and an auxiliary winding arranged on one side of a framework 10, pins corresponding to the secondary winding arranged on the other side of the framework 10, and the like. The transformer can be identical in length and width to the SMD-type non-isolated EPC17 transformer in length and width, so that the required installation space is required to be identical in length and width to the SMD-type non-isolated EPC17 transformer when the transformer is replaced with the SMD-type non-isolated EPC17 transformer in the bottom box. According to the setting of actual need, the maximum length of transformer is 24mm, and the maximum width of transformer is 19mm.

The transformer of the utility model improves the performance of the whole transformer on the basis of the same length and width as those of an SMD type non-isolated EPC17 transformer and Pin To Pin pins, can output 5V 3A power on power and can pass 4000V/5mA on withstand voltage.

The transformer is applied to a bottom box power supply. In this regard, the bottom box power supply comprises the transformer, and further comprises a closed bottom box, a circuit board, a power supply system, a relay and the like.

The circuit board is arranged in the bottom box, and the transformer, the power supply system, the multi-path relay and the like are arranged on the circuit board and are electrically connected with corresponding circuits on the circuit board.

The base box power supply includes, but is not limited to, a 86-type base box power supply.

The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present utility model.

Claims

1. A transformer, characterized in that it is arranged with EPC transformer pin to pin, said transformer comprises skeleton, winding, EE type magnetic core and pin assembly; the winding is wound on the framework, and the EE type magnetic core is arranged on the framework in a vertical state and encloses the winding;

2. The transformer of claim 1, wherein the backbone has a bottom surface for facing the circuit board, a top surface opposite the bottom surface; the EE-type core comprises two E-type cores;

3. The transformer according to claim 2, wherein the bottom surface of the frame is further provided with at least one baffle for increasing the creepage distance; the baffle is arranged between the third pin group and the EE type magnetic core in a spacing mode.

4. A transformer according to claim 3, wherein two of the blocking pieces are arranged at intervals.

5. A transformer according to claim 3, wherein the height of the baffle on the bottom surface of the frame is not less than 1mm.

6. The transformer of claim 2, wherein the bottom surface of the backbone is provided with a recess for receiving one of the E-cores.

7. The transformer of claim 1, wherein the EE-type core is an EE17 vertical core.

8. The transformer according to any one of claims 1-7, wherein the height of the transformer is 16.2mm or less;

the maximum length of the transformer is 24mm, and the maximum width of the transformer is 19mm.

9. The transformer according to any one of claims 1-7, further comprising insulating tape wound around the outer circumference of the winding and the outer surface of the EE-type core, respectively.

10. A bottom box power supply, characterized by comprising the transformer of any one of claims 1-9, further comprising a closed bottom box and a circuit board, wherein the circuit board is arranged in the bottom box, and the transformer is arranged on the circuit board.