CN209962866U - Magnetic core grounding structure of high-frequency transformer - Google Patents
Magnetic core grounding structure of high-frequency transformer Download PDFInfo
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- CN209962866U CN209962866U CN201921006338.2U CN201921006338U CN209962866U CN 209962866 U CN209962866 U CN 209962866U CN 201921006338 U CN201921006338 U CN 201921006338U CN 209962866 U CN209962866 U CN 209962866U
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Abstract
The utility model provides a magnetic core grounding structure of a high-frequency transformer, which comprises a framework, a magnetic core and a grounding terminal; the magnetic core installation structure is characterized in that a grounding pin and a magnetic core installation through hole are arranged on the framework, a conductive contact is arranged on the grounding terminal and protrudes out of the surface of the grounding terminal, the grounding terminal is electrically connected to the grounding pin, the magnetic core is installed in the magnetic core installation through hole, the conductive contact is abutted to the magnetic core, and the magnetic core passes through the grounding terminal and is electrically connected with the grounding pin. The embodiment of the utility model provides a need not to realize the ground connection of magnetic core on the skeleton with the help of the lead wire, not only assemble simply but also can save a large amount of processes and materials, the cost is reduced has simplified production processes.
Description
Technical Field
The utility model belongs to the technical field of the transformer technique and specifically relates to a magnetic core ground structure of high frequency transformer is related to
Background
The working frequency of the high-frequency transformer exceeds 10kHz, and the high-frequency transformer is mainly applied to a high-frequency switching power supply, a high-frequency inverter power supply and a high-frequency inverter welding machine. The grades can be divided into: 10kHz-50kHz, 50kHz-100kHz, 100 kHz-500 kHz, 500 kHz-1 MHz and more than 10 MHz. Because the dv/dt of the transformer is high when the transformer operates at high frequency, parasitic capacitances between transformer coils and between the switching tube and the heat sink are excited, resulting in common mode interference. Therefore, the most fundamental cause of electromagnetic interference generated by the switching power supply is high di/dt and high dv/dt generated during the operation of the switching power supply, and surge current and spike voltage generated by the switching power supply form interference sources; the large capacitor charge and discharge used by the power frequency rectification filter, the voltage switching of the switch tube during high-frequency work, the reverse recovery current of the output rectifier diode and the like belong to interference sources.
The voltage and current waveforms in the switching power supply are mostly periodic waves close to rectangles, such as the driving waveform of a switching tube, the drain-source waveform of a MOSFET, and the like. For a rectangular wave, the reciprocal of the period determines the fundamental frequency of the waveform; the reciprocal of the rise or fall time of the doubled pulse edges determines the frequency value of the frequency components caused by these edges, typically in the MHz range, with its harmonic frequencies higher. These high frequency signals can interfere with the switching power supply basic signals, especially the signals of the control circuit. The electromagnetic noise of the switching power supply can be classified into two categories from noise sources, one category is external noise, for example, common mode and differential mode noise transmitted through a power grid, interference of external electromagnetic radiation on a control circuit of the switching power supply, and the like; another type is the electromagnetic noise generated by the switching power supply itself, such as harmonic waves and electromagnetic radiation interference generated by the current spikes of the switching tube and the rectifying tube.
In the prior art, in order to solve the above interference, a shielding method is generally adopted to suppress the EMI interference, that is, the magnetic core is grounded. However, in the research and practice of the present invention, the inventor finds out the existing grounding methods, one is to wind a circle of copper foil around the magnetic core and then use the lead wire to ground, and the other is to use the lead wire to connect the conductive adhesive on the magnetic core, and these two methods will result in high material cost and high labor consumption.
SUMMERY OF THE UTILITY MODEL
The utility model provides a magnetic core ground structure of high frequency transformer need not to realize the ground connection of magnetic core on the skeleton with the help of the lead wire, and not only the assembly is simple, can save a large amount of processes and material moreover to the cost is reduced and production processes have been simplified.
In order to solve the above technical problem, an embodiment of the present invention provides a magnetic core grounding structure of a high-frequency transformer, including a framework, a magnetic core and a grounding terminal; the magnetic core installation structure is characterized in that a grounding pin and a magnetic core installation through hole are arranged on the framework, a conductive contact is arranged on the grounding terminal and protrudes out of the surface of the grounding terminal, the grounding terminal is electrically connected to the grounding pin, the magnetic core is installed in the magnetic core installation through hole, the conductive contact is abutted to the magnetic core, and the magnetic core passes through the grounding terminal and is electrically connected with the grounding pin.
Preferably, the conductive contact is an elastic metal sheet protruding from the surface of the ground terminal, and when the magnetic core is mounted in the magnetic core mounting through hole, the magnetic core touches and presses the elastic metal sheet, and the elastic metal sheet always abuts against the magnetic core.
Preferably, the grounding pin comprises a first pin and a second pin, the first pin is mounted on a baffle on one side of the framework, and the second pin is mounted on a baffle on the other side of the framework;
one end of the grounding terminal is electrically connected to the first pin, and the other end of the grounding terminal is electrically connected to the second pin.
As a preferred scheme, the ground terminal comprises a first connecting end, a first bent part, a bridging part, a second bent part and a second connecting end which are connected in sequence;
the first connecting end serving as one end of the grounding terminal is electrically connected to the first pin, the first bent part is tightly attached to one side baffle of the framework, the bridging part is located on the edge of the orifice of the magnetic core mounting through hole, the second bent part is tightly attached to the other side baffle of the framework, and the second connecting end serving as the other end of the grounding terminal is electrically connected to the second pin.
Preferably, a first bayonet is arranged at one end of the ground terminal, and a second bayonet is arranged at the other end of the ground terminal; the first bayonet is clamped on the first pin, and the second bayonet is clamped on the second pin.
Preferably, the bridge part is in a circular arc sheet structure.
Preferably, the ground terminal is made of an elastic metal.
Compared with the prior art, the embodiment of the utility model provides a have following beneficial effect:
(1) the grounding terminal is used for realizing the conductive connection between the magnetic core and the grounding pin, so that the grounding of the magnetic core is ensured, the static electricity on the magnetic core can be stably led out, and the high-frequency transformer is further ensured not to be interfered when in use.
(2) The grounding terminal replaces a lead wire in the prior art and is integrated in the framework, so that when the magnetic core is assembled, the magnetic core is automatically contacted with the grounding terminal through the conductive contact, redundant grounding actions such as lead wires and copper foil winding are not needed, a large amount of processes and materials are saved, production processes are simplified, the space of a production line is reduced, and the automation and the product consistency are facilitated.
(3) The conductive contact protrudes out of the surface of the grounding terminal, when the magnetic core is installed on the framework, the magnetic core presses the conductive contact to deform, so that the conductive contact is always abutted against the magnetic core, the phenomenon of poor contact is avoided, and the reliability and the performance of the overall structure of the grounding terminal are improved.
Drawings
Fig. 1 is an exploded view of a core ground structure of a high-frequency transformer in an embodiment of the present invention;
fig. 2 is an assembly view of the bobbin and the ground terminal of the core ground structure of the high-frequency transformer according to the embodiment of the present invention;
wherein the reference numbers in the drawings of the specification are as follows:
1. a framework; 11. a magnetic core mounting through hole; 12. a first pin; 13. a second pin; 14. a baffle plate;
2. a ground terminal; 21. a conductive contact; 22. a first connection end; 23. a first bent portion; 24. a bridge portion; 25. a second bent portion; 26. a second connection end;
3. a magnetic core; 31. and a magnetic core cap.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1 and 2, a preferred embodiment of the present invention provides a magnetic core grounding structure of a high-frequency transformer, which includes a frame 1, a magnetic core 3 and a grounding terminal 2; be equipped with ground connection pin and magnetic core installation through-hole 11 on skeleton 1, be equipped with conductive contact 21 on the ground connection terminal 2, conductive contact 21 protrusion in the surface of ground connection terminal 2, ground connection terminal 2 electricity is connected on the ground connection pin magnetic core 3 is installed when in 3 installation through-holes 11 of magnetic core, conductive contact 21 supports and leans on the magnetic core 3, magnetic core 3 passes through ground connection terminal 2 with the ground connection pin electricity is connected. Further, the ground terminal 2 and the magnetic core 3 may be fixed by welding.
In this embodiment, the grounding terminal 2 is used to realize the conductive connection between the magnetic core 3 and the grounding pin, so as to ensure the grounding of the magnetic core 3, and therefore, the static electricity on the magnetic core 3 can be stably derived, and further, the high-frequency transformer is ensured not to be interfered when in use.
The grounding terminal 2 replaces a lead wire in the prior art, and the grounding terminal 2 is integrated in the framework 1, so that when the magnetic core 3 is assembled, the magnetic core 3 is automatically contacted with the grounding terminal 2 through the conductive contact 21, and unnecessary grounding actions such as leading wires, winding copper foils and the like are not needed, so that a large number of processes and materials are saved, the production process is simplified, the space of a production line is reduced, and the automation and the consistency of products are facilitated.
In addition, the conductive contact 21 protrudes from the surface of the grounding terminal 2, when the magnetic core 3 is installed on the framework 1, the magnetic core 3 will press the conductive contact 21 to deform, so that the conductive contact 21 is always abutted against the magnetic core 3, the poor contact phenomenon is avoided, and the reliability and the overall structure performance of the grounding terminal 2 are improved.
In this embodiment, it should be noted that the framework 1 is a base for fixing the magnetic core 3 and the ground terminal 2, and the components are plastic or plastic and metal; of course, in other embodiments, the structures of the skeleton 1 and the magnetic core 3 may adopt other existing skeleton structures and magnetic core structures, and the mutual installation positions between them may also be selected according to actual needs, which can be easily implemented by those skilled in the art and will not be described again. Preferably, the grounding terminal 2 is made of elastic metal, so that a good conductive grounding function can be realized, the production and processing operations can be facilitated, and the grounding terminal is not easy to break. In addition, the fixing mode of the framework 1 and the grounding terminal 2 is formed by an assembling or Molding process, and automatic assembling or production can be realized.
Referring to fig. 1, in the embodiment of the present invention, in order to rationalize the structure, the conductive contact is an elastic metal sheet protruding from the surface of the ground terminal 2, when the magnetic core 3 is installed in the magnetic core 3 installation through hole 11, the magnetic core 3 touches and presses the elastic metal sheet, and the elastic metal sheet always abuts against the magnetic core 3.
In this embodiment, the ground terminal 2 and the ground pin of the frame 1 are combined by various processes to form a via, and the via is connected to the PCBA or the device to achieve grounding, and the ground terminal 2 reserves a pin and is connected to the PCBA or the device by processes such as soldering, lapping, riveting, and the like.
Preferably, the ground pin includes a first pin 12 and a second pin 13, the first pin 12 is mounted on one side of the frame 1, and the second pin 13 is mounted on the other side of the frame 1; one end of the ground terminal 2 is electrically connected to the first pin 12, and the other end of the ground terminal 2 is electrically connected to the second pin 13.
Referring to fig. 1 and fig. 2, in the embodiment of the present invention, the ground terminal 2 includes a first connection end 22, a first bent portion 23, a bridge portion 24, a second bent portion 25, and a second connection end 26, which are connected in sequence, and the conductive contact is disposed on the first bent portion 23; wherein, bridge 24 is circular arc sheet structure, in order to adapt to magnetic core 3 the design of 3 installation through-holes 11 of magnetic core avoids installing during magnetic core 3, bridge 24 hinders on the installation passageway of magnetic core 3 to the design is the circular arc slice, and simultaneously thin slice formula structural design is favorable to with ground terminal 2 with skeleton 1 is integrated as an organic whole, is convenient for skeleton 1 with assembly between the magnetic core 3.
The first connection end 22 is electrically connected to the first pin 12 as one end of the ground terminal 2, the first bent portion 23 is tightly attached to one side of the frame 1, the bridge portion 24 is located at an edge of an opening of the magnetic core 3 mounting through hole 11, the second bent portion 25 is tightly attached to the other side of the frame 1, and the second connection end 26 is electrically connected to the second pin 13 as the other end of the ground terminal 2.
Preferably, in order to facilitate the assembly between the ground terminal 2 and the framework 1, a first bayonet is arranged at one end of the ground terminal 2, and a second bayonet is arranged at the other end of the ground terminal 2; the first bayonet is clamped on the first pin 12, and the second bayonet is clamped on the second pin 13.
To sum up, the utility model provides a magnetic core ground structure of high frequency transformer compares in prior art, has following beneficial effect:
(1) the grounding terminal 2 is used for realizing the conductive connection between the magnetic core 3 and the grounding pin, so that the grounding of the magnetic core 3 is ensured, the static electricity on the magnetic core 3 can be stably led out, and the high-frequency transformer is further ensured not to be interfered when in use.
(2) The grounding terminal 2 replaces a lead wire in the prior art, and the grounding terminal 2 is integrated in the framework 1, so that when the magnetic core 3 is assembled, the magnetic core 3 is automatically contacted with the grounding terminal 2 through the conductive contact 21, redundant grounding actions such as lead wires and copper foil winding are not needed, a large amount of processes and materials are saved, the production process is simplified, the space of a production line is reduced, and the automation and the product consistency are facilitated.
(3) The conductive contact 21 protrudes out of the surface of the grounding terminal 2, when the magnetic core 3 is installed on the framework 1, the magnetic core 3 presses the conductive contact 21 to deform, so that the conductive contact 21 is always abutted against the magnetic core 3, poor contact is avoided, and the reliability and the performance of the overall structure of the grounding terminal 2 are improved.
(4) The grounding terminal 2 is integrated in the framework 1, so that when the magnetic core 3 is assembled, the grounding terminal 2 and the magnetic core 3 are automatically contacted, redundant grounding action is not needed, a large number of processes and materials are saved, a large number of devices can be saved during production, the production processes are simplified, the space of a production line is reduced, and the automation and the product consistency are facilitated.
(5) The structure is adapted to the framework 1, the grounding terminal 2 is designed to be a bent sheet, and the grounding terminal 2 is firmly connected to the grounding pin by utilizing the conductivity of the grounding terminal 2, so that the conductive grounding of the magnetic core 3 is realized; the sheet structure design can reduce the space occupied by the grounding terminal 2 on the framework 1, so that the grounding terminal 2 and the framework 1 are integrated, when the magnetic core 3 is installed, the magnetic core 3 is inserted into the magnetic core installation through hole 11 by directly holding the magnetic core cap 31, and at the moment, the magnetic core cap 31 covers the grounding terminal, thereby greatly simplifying the magnetic core installation process; meanwhile, the material cost, the manufacturing cost and the manual operation cost of the grounding terminal 2 are low, and the product cost is favorably reduced.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.
Claims (7)
1. A magnetic core grounding structure of a high-frequency transformer is characterized by comprising a framework, a magnetic core and a grounding terminal; the magnetic core installation structure is characterized in that a grounding pin and a magnetic core installation through hole are arranged on the framework, a conductive contact is arranged on the grounding terminal and protrudes out of the surface of the grounding terminal, the grounding terminal is electrically connected to the grounding pin, the magnetic core is installed in the magnetic core installation through hole, the conductive contact is abutted to the magnetic core, and the magnetic core passes through the grounding terminal and is electrically connected with the grounding pin.
2. The core grounding structure of a high-frequency transformer according to claim 1, wherein said conductive contact is an elastic metal piece protruded from a surface of said ground terminal, and when said core is mounted in said core mounting through hole, said core touches and presses said elastic metal piece, and said elastic metal piece always abuts on said core.
3. The high-frequency transformer core ground structure according to claim 2, wherein said ground pin includes a first pin and a second pin, said first pin being mounted on one side plate of said bobbin, said second pin being mounted on the other side plate of said bobbin;
one end of the grounding terminal is electrically connected to the first pin, and the other end of the grounding terminal is electrically connected to the second pin.
4. The magnetic core grounding structure of a high-frequency transformer according to claim 3, wherein the grounding terminal includes a first connecting end, a first bent portion, a bridging portion, a second bent portion, and a second connecting end connected in sequence, and the conductive contact is disposed on the first bent portion;
the first connecting end serving as one end of the grounding terminal is electrically connected to the first pin, the first bent part is tightly attached to one side baffle of the framework, the bridging part is located on the edge of the orifice of the magnetic core mounting through hole, the second bent part is tightly attached to the other side baffle of the framework, and the second connecting end serving as the other end of the grounding terminal is electrically connected to the second pin.
5. The core ground structure of a high-frequency transformer according to claim 3 or 4, wherein one end portion of said ground terminal is provided with a first bayonet, and the other end portion of said ground terminal is provided with a second bayonet; the first bayonet is clamped on the first pin, and the second bayonet is clamped on the second pin.
6. The core ground structure of a high-frequency transformer according to claim 4, wherein said bridge portion has a circular arc sheet-like structure.
7. The core ground structure of a high-frequency transformer according to claim 1 or 2, wherein said ground terminal is an elastic metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921006338.2U CN209962866U (en) | 2019-06-28 | 2019-06-28 | Magnetic core grounding structure of high-frequency transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921006338.2U CN209962866U (en) | 2019-06-28 | 2019-06-28 | Magnetic core grounding structure of high-frequency transformer |
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| CN209962866U true CN209962866U (en) | 2020-01-17 |
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| CN201921006338.2U Active CN209962866U (en) | 2019-06-28 | 2019-06-28 | Magnetic core grounding structure of high-frequency transformer |
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