CN206301680U - A kind of high frequency transformer electromagnetic compatibility structure - Google Patents

Abstract

The utility model is related to a kind of high frequency transformer electromagnetic compatibility structure, belongs to technical field of transformer equipment.Technical scheme is：Epoxy resin（7）Embedding is arranged on primary coil（2）, low-voltage coil（3）And high-tension coil（4）Outside, U-shaped radome（8）Extend around magnetic core, be arranged on winding construction（1）Outside, external shield（9）Comprising connection ring one（10）, connection ring two（11）With shielding piece（12）, connection ring（10）Around being arranged on winding construction（1）Low side outside, connection ring two（11）Around being arranged on winding construction（1）High-end outside.The beneficial effects of the utility model are：Not only can effectively prevent the interference of external radiation, it is also possible to the electromagnetic field that shielded transformer is produced in itself, make it without interference with other equipment normal work, small volume, it is easy to accomplish.

Description

A kind of high frequency transformer electromagnetic compatibility structure

Technical field

The utility model is related to a kind of high frequency transformer electromagnetic compatibility structure, belongs to technical field of transformer equipment.

Background technology

At present, the Switching Power Supply with high frequency transformer as core has become the core component of hyundai electronicses industry, it The characteristics of with small volume, lightweight, efficiency high and low cost, linear power supply has been instead of substantially in the position of electron trade. But due to Switching Power Supply design feature in itself, it must operate under high-frequency switch working state, and groundwork is frequently Rate is between 20 ~ 500KHz, if not doing corresponding anti-electromagnetic interference design, it must form a high-frequency electromagnetic interference transmitting Source, make other electronic equipments of its periphery cannot normal work, while itself can also be disturbed by from other electronic equipments, Here it is our usually said electromagnetic compatibility problems.Generally, high frequency transformer working frequency is higher, its electromagnetic interference Problem is more serious.So, we must design a kind of appearance that can effectively prevent such interference problem, and most direct mode is just It is that this body structure is started with from transformer, increase prevents the shielding construction of electromagnetic interference, and high frequency transformer is electromagnetically shielded, Majority is designed to integrally be enclosed in transformer in one can of sealing, and the part of drive circuit is also included within sometimes It is interior.It is issuable arcing between preventing in high pressure winding and can during using this shielding construction, will in the middle of both Leave sufficiently large space.So, this shielding construction is undesirable to the shield effectiveness of electromagnetic field, while also occupies phase When big space.A kind of shielding construction is integrally potted in transformer in the insulating materials with high-k, is formed Integrated gapless structure.The problem of the integral structure of this perfusion is：Embedding is reached gapless, there is phase in technological operation When big difficulty；Because the displacement charge of the Embedding Material with epoxy resin as representative forms high potential on encapsulating material surface, will Arcing is formed to the surface for there are enough potential differences by the air compared with low-k.

Utility model content

The utility model purpose is to provide a kind of high frequency transformer electromagnetic compatibility structure, in close proximity to high frequency transformer winding compared with Existing fringing field region sets continuous shielding loop in an electrical characteristic, sets another near the periphery of winding in higher electric field region Continuous shielding loop in one electrical characteristic, by selecting the profile of equifield intensity and combining continuous in appropriate selection electrical characteristic Loop number, the shape of shading ring and its spacing, not only can effectively prevent the interference of external radiation, it is also possible to shield transformation The electromagnetic field that device is produced in itself, makes it without interference with other equipment normal work, efficiently solves present in background technology Above mentioned problem.

The technical solution of the utility model is：A kind of high frequency transformer electromagnetic compatibility structure, comprising winding construction, primary line Circle, low-voltage coil, high-tension coil, FERRITE CORE one, FERRITE CORE two, epoxy resin, U-shaped radome and external shield, The high-tension coil winding construction length direction with linear distribution coiling, be provided separately with primary coil, low-voltage coil, ring Epoxy resin embedding is arranged on the outside of primary coil, low-voltage coil and high-tension coil, and FERRITE CORE one, FERRITE CORE two are tight Close docking forms magnetic core, and size and the core size of U-shaped radome match, and extends around magnetic core, is arranged on winding construction Outside, external shield includes connection ring one, connection ring two and shielding piece, and under, upper, the two passes through connection ring two connection ring one Shielding piece is interconnected, and around being arranged on outside the low side of winding construction, contact position is provided with epoxy resin layer to connection ring one, connection Ring two is provided with gap around the high-end outside for being arranged on winding construction between winding construction, connection ring one, connection ring two it is straight Footpath matches with electric-field intensity.

Diode, continuous pin, printed circuit and insulated conductor are also included, the printed circuit is arranged on winding construction Bottom, primary coil, low-voltage coil are interconnected by continuous pin and printed circuit, diode embedding together with high-tension coil Set in the epoxy, the low-pressure end of high-tension coil is interconnected by lead with printed circuit, high-pressure side by diode, Insulated conductor is interconnected with external circuit.

The connection ring one, the material of connection ring two are Copper Foil.

The connection ring one, the width of connection ring two are equal with the spacing between connection ring one, connection ring two, are respectively winding / 3rd of structure length.

The beneficial effects of the utility model are：Connected in appropriate selection electrical characteristic by selecting the profile of equifield intensity and combining Continuous loop number, the shape of shading ring and its spacing, so that Switch Power Transformer obtains fairly perfect shield effectiveness, not only The interference of external radiation can effectively be prevented, it is also possible to the electromagnetic field that shielded transformer is produced in itself, make it without interference with it His equipment normal work, small volume, it is easy to accomplish, on the basis of this structure type, the size and cloth of appropriate change shading ring Office, can provide a distributed heat removal device, to strengthen the cooling effect of transformer for transformer.

Brief description of the drawings

Fig. 1 is high frequency transformer main body of the present utility model and shielding construction figure；

Fig. 2 is the utility model transformer Electric Field Distribution curve map；

Fig. 3 is the utility model high frequency transformer shielding exploded view；

In figure：Winding construction 1, primary coil 2, low-voltage coil 3, high-tension coil 4, FERRITE CORE one 5, FERRITE CORE 26, epoxy resin 7, U-shaped radome 8, external shield 9, connection ring 1, connection ring 2 11, shielding piece 12, diode 13, company Continuous pin 14, printed circuit 15, insulated conductor 16.

Specific embodiment

Below in conjunction with accompanying drawing, by embodiment, the utility model is described in further detail.

A kind of high frequency transformer electromagnetic compatibility structure, comprising winding construction 1, primary coil 2, low-voltage coil 3, high-tension coil 4th, FERRITE CORE 1, FERRITE CORE 26, epoxy resin 7, U-shaped radome 8 and external shield 9, the high-tension coil 4 exist The length direction of winding construction 1 is provided separately with linear distribution coiling with primary coil 2, low-voltage coil 3, the embedding of epoxy resin 7 The outside of primary coil 2, low-voltage coil 3 and high-tension coil 4 is arranged on, FERRITE CORE 1, FERRITE CORE 26 are closely right Connect to form magnetic core, size and the core size of U-shaped radome 8 match, extend around magnetic core, be arranged on the outer of winding construction 1 Portion, external shield 9 includes connection ring 1, connection ring 2 11 and shielding piece 12, and under, connection ring 2 11 exists connection ring 1 On, the two is interconnected by shielding piece 12, and around being arranged on outside the low side of winding construction 1, contact position sets connection ring 1 There is epoxy resin layer, connection ring 2 11 is provided with gap around the high-end outside for being arranged on winding construction 1 between winding construction 1, Connection ring 1, the diameter of connection ring 2 11 and electric-field intensity match.

Diode 13, continuous pin 14, printed circuit 15 and insulated conductor 16 are also included, the printed circuit 15 is arranged on The bottom of winding construction 1, primary coil 2, low-voltage coil 3 are interconnected by continuous pin 14 with printed circuit 15, diode 13 together with high-tension coil 4 embedding be arranged in epoxy resin 7, the low-pressure end of high-tension coil 4 is by lead and printed circuit 15 Interconnect, high-pressure side is interconnected by diode 13, insulated conductor 16 and external circuit.

The connection ring 1, the material of connection ring 2 11 are Copper Foil.

The connection ring 1, the width of connection ring 2 11 are equal with the spacing between connection ring 1, connection ring 2 11, It is respectively 1/3rd of the length of winding construction 1.

In actual applications, on section as shown in Figure 1, it can be seen that magnetic circuit pass through cylindrical winding construction 1 and one or Several low-voltage coils, and secondary high pressure coil.High-tension coil is separated with other coils, along the length side of winding construction To with linear distribution coiling, with reference to the structure of primary coil 2, the layout of low-voltage coil 3 and magnetic circuit, form as shown in Figure 2 Electric-field intensity distribution situation, the maximum field intensity of transformer is being close to the end of winding construction 1, without at its edge.

The FERRITE CORE 1 of two parts closed butt joint, FERRITE CORE 26, it is suitable to be left at its binding site Air gap, common U-shaped radome 8 extends around magnetic core, the magnetic circuit of the Outboard Sections of winding construction 1 is covered, and include Air gap also cover interior.

The external shield 9 of the second magnetic circuit is by 2 11 groups of the first electrical characteristic connection ring 1 and the second electrical characteristic connection ring Into they are made with Copper Foil or other metals.Two rings are connected by shielding piece 12, and from a suitable distance interval. During specific design, connection ring 1, the width of connection ring 2 11 and standoff distance respectively account for 1/3rd of the length of winding construction 1. External shield 9 extends to whole transformer and U-shaped radome 8, and wherein connection ring 1 is close to coil assembly outer surface, in low side There is the epoxy resin layer of adequate thickness contact position.Connection ring 2 11 maintains sufficiently large around between the high-end of winding, with winding Space（Therebetween or filled with other media）, to prevent from producing arcing between epoxy resin surface and connection ring 2 11.To difference Electric-field intensity distribution, the number of corresponding electrical connection ring and arrangement also differ, and electric-field intensity is higher, and the diameter of ring is got over Greatly.Connection ring 1 and connection ring 2 11 surround whole magnetic circuit, the sum of zero of magnetic flux in ring, therefore shield effectiveness compares reason Think.

Claims (4)

1. a kind of high frequency transformer electromagnetic compatibility structure, it is characterised in that：Comprising winding construction（1）, primary coil（2）, low pressure Coil（3）, high-tension coil（4）, FERRITE CORE one（5）, FERRITE CORE two（6）, epoxy resin（7）, U-shaped radome（8） And external shield（9）, the high-tension coil（4）In winding construction（1）Length direction with linear distribution coiling, with primary coil （2）, low-voltage coil（3）It is provided separately, epoxy resin（7）Embedding is arranged on primary coil（2）, low-voltage coil（3）And high-voltage line Circle（4）Outside, FERRITE CORE one（5）, FERRITE CORE two（6）Closed butt joint forms magnetic core, U-shaped radome（8）Chi It is very little to match with core size, extend around magnetic core, it is arranged on winding construction（1）Outside, external shield（9）Comprising connection ring One（10）, connection ring two（11）With shielding piece（12）, connection ring（10）Under, connection ring two（11）Upper, the two is by screen Cover piece（12）Interconnect, connection ring one（10）Around being arranged on winding construction（1）Low side outside, contact position is provided with asphalt mixtures modified by epoxy resin Lipid layer, connection ring two（11）Around being arranged on winding construction（1）High-end outside, with winding construction（1）Between be provided with gap, even Connect ring one（10）, connection ring two（11）Diameter match with electric-field intensity.

2. a kind of high frequency transformer electromagnetic compatibility structure according to claim 1, it is characterised in that：Also include diode （13）, continuous pin（14）, printed circuit（15）And insulated conductor（16）, the printed circuit（15）It is arranged on winding construction （1）Bottom, primary coil（2）, low-voltage coil（3）By continuous pin（14）With printed circuit（15）Interconnect, two poles Pipe（13）With high-tension coil（4）Embedding together is arranged on epoxy resin（7）In, high-tension coil（4）Low-pressure end by lead with Printed circuit（15）Interconnect, high-pressure side passes through diode（13）, insulated conductor（16）Interconnected with external circuit.

3. a kind of high frequency transformer electromagnetic compatibility structure according to claim 1, it is characterised in that：The connection ring one （10）, connection ring two（11）Material be Copper Foil.

4. a kind of high frequency transformer electromagnetic compatibility structure according to claim 1, it is characterised in that：The connection ring one （10）, connection ring two（11）Width and connection ring one（10）, connection ring two（11）Between spacing it is equal, be respectively winding construction （1）/ 3rd of length.