CN201138608Y - Novel planar transformer - Google Patents
Novel planar transformer Download PDFInfo
- Publication number
- CN201138608Y CN201138608Y CNU2007201960634U CN200720196063U CN201138608Y CN 201138608 Y CN201138608 Y CN 201138608Y CN U2007201960634 U CNU2007201960634 U CN U2007201960634U CN 200720196063 U CN200720196063 U CN 200720196063U CN 201138608 Y CN201138608 Y CN 201138608Y
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Abstract
The utility model discloses a novel plane transformer which includes a magnetic core and a winding arranged on a PCB plate; the utility model is characterized in that a primary winding is arranged on one block or more than one block of primary PCB plates; a secondary winding is arranged on another block or more than one block of secondary PCB plates; besides, an insulating layer is arranged between the primary PCB plate and the secondary PCB plate. The novel plane transformer of the utility model not only can be implemented to have a high efficiency, but also almost does not generate capacitive effect under a high voltage-resistance requirement.
Description
Technical field
The utility model relates to transformer, specifically, relates to a kind of novel planar transformer.
Background technology
Twentieth century the mid-90 begins, along with portable electronic address and messaging device, as rolling up of demands such as laptop computer, mobile phone, mobile phone, adopt the assembling of surface mounting technology, just require the electronic transformer miniaturization, the small and exquisite ferrite core flat surface transformer of volume has just arisen at the historic moment.Compare with traditional transformer, the difference of flat surface transformer maximum is magnetic core and coil windings thereof.Flat surface transformer does not have the copper conductor winding, replace the conducting wire thin layer on the pcb board (printed circuit board (PCB)) of being printed on of single or multiple lift, thereby its thickness is far below conventional transformer.In flat surface transformer, owing to be actually the conductor on some planes as " lead " of winding, thereby can obtain very big current density, every layer of winding maximum current can reach 200A.Simultaneously, because magnetic core is little, loss is few, and it can obtain higher efficient.When switching frequency was 500kHz, its operating efficiency can reach 97%, and its high current density and high efficiency can make single transformer efficiency up to 5W-20000W.Along with the development of electronic information technology, electronic transformer will further develop to small-sized light weight, highly effective and safe, mounted on surface, chip, complanation, high reliability and production automation direction.At present, all begin to adopt the flat surface transformer technology in external many power supply products, as charge in batteries power supply, communication equipment distributed power source, UPS etc.
For a desirable transformer, the magnetic flux that elementary winding produced all passes secondary winding, does not promptly have leakage flux.And concerning common transformer, the magnetic flux that elementary winding produced not is all to pass secondary winding, so just produced leakage inductance, the tight requirement of electromagnetic coupled also can't be satisfied.Therefore, the characteristics of flat surface transformer are just apparent: the close-coupled of plane winding makes leakage inductance reduce widely; The special structure of flat surface transformer makes its very low of height, and this makes that transformer is made in the imagination on the pcb board is accomplished.Opposite, if the gap between winding is big more, mean that then leakage inductance is big more, also just produced higher energy loss.
Therefore, common flat surface transformer all is that elementary winding and secondary winding directly are printed on the pcb board of a multilayer generally at present.Yet, this has brought two new problems: the one,, because the spacing that is arranged between a plurality of windings on the pcb board is very little, and the insulation property of pcb board material itself are limited, particularly when requiring to reach several kilovolts of requirement of withstand voltage of safety standard, the capacitive effect that is produced will cause electromagnetic interference, therefore, a lower capacitance then must be made the selection of a compromise between leakage inductance and capacitance if desired.The 2nd,, because the structural similarity of a plurality of windings, spacing between the pin of winding and another different windings is very little, the pin of a winding is also very little with spacing between the pin of another different windings, this causes being arranged between the pin of certain winding and another different windings on the pcb board, and can't reach very high requirement of withstand voltage between the pin of two different windings.
Summary of the invention
Technical problem to be solved in the utility model is, a kind of high efficiency that both had is provided, and can produce the flat surface transformer of the new structure of capacitive effect again under very high requirement of withstand voltage hardly.
The utility model is to realize like this, a kind of novel planar transformer, magnetic core and the winding that is arranged on the pcb board have been comprised, it is characterized in that, elementary winding is arranged on the elementary pcb board more than one or one, secondary winding is arranged on another piece or the secondary pcb board more than, and is provided with insulating barrier between elementary pcb board and secondary pcb board.
Preferred implementation is the described elementary pcb board and the secondary pcb board arranged crosswise that is provided with secondary winding that is provided with elementary winding.
Preferred implementation is, is arranged between the elementary winding on two or more than two the elementary pcb board to connect by serial or parallel connection.
Preferred implementation is, is arranged between the secondary winding on two or more than two the secondary pcb board to connect by serial or parallel connection.
Preferred implementation is that the pin of elementary winding and the pin of secondary winding are arranged on the same side of pcb board; Between the pin of the pin of elementary winding and secondary winding, between the pin and secondary winding of elementary winding, and between the pin of elementary winding and secondary winding, be provided with dielectric isolation layer.
Preferred implementation is, the pin of elementary winding and the pin of secondary winding are arranged on the both sides of pcb board, between the pin of the pin of elementary winding and secondary winding, between the pin and secondary winding of elementary winding, and between the pin of elementary winding and secondary winding, be provided with dielectric isolation layer.
Implement novel planar transformer of the present utility model, both had the advantage that the common plane transformer is used to have, can satisfy very high requirement of withstand voltage again, and produce capacitive effect hardly.
Description of drawings
Fig. 1 and Fig. 2 are respectively the overall structure positive and negative schematic diagrames of embodiment one flat surface transformer;
Fig. 3 is the explosive view of Fig. 2;
Fig. 4 is the circuit diagram of embodiment one;
Fig. 5 is the right side view of Fig. 1;
Fig. 6 is the whole exploded perspective view of embodiment two flat surface transformers;
Fig. 7 is the schematic diagrames of embodiment two pcb boards when being stacked;
Fig. 8 is embodiment two flat surface transformer overall structure lateral plans;
Fig. 9 is the circuit diagram of embodiment two;
Figure 10 is the circuit diagram of embodiment three;
Figure 11 and Figure 12 are two kinds of circuit diagrams of embodiment four.
Embodiment
Below, in conjunction with the accompanying drawings and embodiments novel planar transformer of the present utility model is described in further detail.
Embodiment one: elementary winding and secondary winding are separately positioned on two pcb boards.
As depicted in figs. 1 and 2, novel planar transformer of the present utility model, elementary winding 1 are arranged on the elementary pcb board 1A, and secondary winding is provided with 2 on the secondary pcb board 2A of another piece; Elementary winding 1 is identical with the structure of secondary winding 2, is and directly is printed on a worm-rotating type conducting wire thin layer on the pcb board.
As shown in figures 1 and 3, pin 11 has been drawn in the worm-rotating type conducting wire that is arranged on elementary pcb board 1A upper surface, pin 12 has been drawn in the worm-rotating type conducting wire that is arranged on elementary pcb board 1A lower surface, and the worm-rotating type conducting wire that is arranged on upper and lower surface links together by the through hole on the pcb board 10.Same, as shown in figures 1 and 3, pin 21 and 22 have also been drawn in the worm-rotating type conducting wire that is arranged on secondary pcb board 2A upper and lower surface.
As shown in Figure 1, elementary pcb board 1A and secondary pcb board 2A compact reactor up and down stack, be provided with through hole M of hollow out in the middle of it, the magnetic core of being made by the high-frequency power ferrite soft magnetic material (among the figure for illustrating) passes this through hole M and is looped around the periphery of two pcb boards.Then, said structure has promptly formed the transformer circuit of a standard, and as shown in Figure 4, the P end is elementary winding, and the S end is secondary winding; The P end has elementary winding pin 11 and 12, and the S end has secondary winding pin 21 and 22.
In the present embodiment, as mentioned above, the worm-rotating type conducting wire of elementary winding and secondary winding is separately positioned on two pcb boards, rather than as now common flat surface transformer, it is arranged on a different layers on the pcb board, this has increased the spacing distance between different windings, thereby has improved the withstand voltage properties of flat surface transformer, and the electromagnetic interference that transformer produced is also less.
In the present embodiment, as mentioned above, the worm-rotating type conducting wire of elementary winding is the upper and lower surface that is separately positioned on elementary pcb board.Conspicuous, in order to increase the turn ratio between elementary winding and the secondary winding, that is, in order to obtain bigger transformation amplitude, the worm-rotating type conducting wire of elementary winding also can be provided with the worm-rotating type conducting wire of multilayer in elementary pcb board; Perhaps, secondary winding only is provided with worm-rotating type conducting wire of the less number of turn or the like at the upper surface of secondary pcb board.Further, the elementary winding described in the present patent application text, the not input of Bi Ran connection power supply; And secondary winding, the also output of uninevitable connection power supply.
As shown in Figure 5, elementary pcb board 1A and secondary pcb board 2A closely pile up up and down, promptly mean the close-coupled of elementary winding and secondary winding, thereby make the leakage inductance of this flat surface transformer reduce widely, and energy loss is very little during conversion; And this structure makes the whole height of transformer almost only need to consider the length of pin, and build is very small and exquisite, meets the trend of electronic transformer miniaturization; 11,12 and 21,22 pins that Transformer Winding is drawn can be realized the surface-mounted of automation easily.
As shown in Figure 5, between elementary pcb board 1A and secondary pcb board 2A, be provided with insulating barrier 3.This insulating barrier can be by vacuum paint dipping technology, at surface, worm-rotating type conducting wire and pcb board surface coverage one deck insulating varnish of winding; Perhaps recharging ultra-thin methods such as insulating material simultaneously realizes.This insulating barrier can elementary winding of effective isolation and secondary winding, has improved the withstand voltage properties of the utility model flat surface transformer.Simultaneously, because this insulating barrier is extremely thin, human eye is visual almost can't distinguish its thickness, therefore, this close-coupled to elementary winding and secondary winding exerts an influence hardly, solve the contradiction between transformer efficiency index and the withstand voltage index of transformer, also between leakage inductance and capacitance, obtained good balance.
As Fig. 1, Fig. 2 and shown in Figure 3, in a preferred implementation of the present utility model, the pin 11 and 12 of elementary winding, pin 21 and 22 with secondary winding, be arranged on the same side of pcb board, this helps this transformer is realized the surface-mounted of automation as an electronic component on the appliance circuit plate.As shown in Figure 1, elementary pcb board 1A is provided with breach above close secondary winding pin 21 and 22 root positions; As shown in Figure 2, secondary pcb board 2A also is provided with breach near elementary winding pin 11 and 12 location about.And these breach spaces can also be provided with dielectric isolation layer, such as, at these gap position fill insulants, perhaps cover insulating varnish etc.These breach structures, and insulating material further is set or covers insulating varnish etc., constituted jointly between the pin of elementary winding and secondary winding, and the pin of elementary winding and the insulation isolation scheme between the secondary winding.Above-mentionedly once mentioned, insulating barrier is set between pcb board can adopts vacuum paint dipping technology to realize, herein, the dielectric isolation layer that between the pin of the pin of elementary winding and secondary winding, is provided with, also can adopt this technology, i.e. all complete covering one deck insulating varnish on all pin surfaces.These insulation technology schemes can further improve the withstand voltage properties of the utility model flat surface transformer.Conspicuous, another preferred implementation of the present utility model is, the pin of the pin of elementary winding and secondary winding is arranged on the both sides of pcb board, and then, because the spacing between the pin of two windings increases, withstand voltage properties will be better.If, further between the pin and secondary winding of elementary winding, and aforesaid insulation technology scheme is set between the pin of elementary winding and secondary winding, then adopt the withstand voltage properties of the transformer of this kind preferred implementation manufacturing to incite somebody to action better.
Embodiment two: two elementary winding branches of series connection are located at up and down on two pcb boards; Secondary winding is arranged on the pcb board, and is clipped in the elementary winding centre of two pcb boards up and down.
As shown in Figure 6, in the present embodiment, always have three pcb boards that are provided with winding; It up and down is respectively arranged with elementary winding 4 and 6 on two elementary pcb board 4A and the 6A; The secondary pcb board 5A that is clipped between 4A and the 6A is provided with secondary winding 5.The first elementary pcb board 4A goes up the worm-rotating type conducting wire that is provided with pin 41 and 42, the second elementary pcb board 6A goes up the worm-rotating type conducting wire that is provided with pin 61 and contact 62, wherein, pin 42 is connected with contact 62, promptly, winding 4 and winding 6 are connected in series, and pin 41 and 61 becomes the pin of the whole elementary winding of this transformer.Secondary pcb board 5A goes up the worm-rotating type conducting wire that is provided with pin 51 and 52.As shown in Figure 7, three pcb boards compact reactor up and down stack, and constitute a flat surface transformer integral body, and as shown in Figure 6, the magnetic core M1 that is made by the high-frequency power ferrite soft magnetic material passes this through hole and is looped around the periphery (as shown in Figure 8) of three pcb boards.Then, said structure has promptly formed the transformer circuit of a standard, and as shown in Figure 9, the P end is elementary winding, and the S end is secondary winding; The P end has elementary winding pin 41 and 61, and the S end has secondary winding pin 51 and 52.
Similar the foregoing description one is described, in the present embodiment, as shown in Figure 8, between pcb board 4A and pcb board 5A, and between pcb board 5A and pcb board 6A, is provided with insulating barrier 3.As above-mentioned embodiment one, this insulating barrier can be by vacuum paint dipping technology, at surface, worm-rotating type conducting wire and pcb board surface coverage one deck insulating varnish of winding; Perhaps recharging ultra-thin methods such as insulating material simultaneously realizes.This insulating barrier can elementary winding of effective isolation and secondary winding, has improved the withstand voltage properties of the utility model flat surface transformer.Simultaneously, because this insulating barrier is extremely thin, human eye is visual almost can't distinguish its thickness, therefore, this close-coupled to elementary winding and secondary winding exerts an influence hardly, solve the contradiction between transformer efficiency index and the withstand voltage index of transformer, also between leakage inductance and capacitance, obtained good balance.
Similar the foregoing description one is described, and in the present embodiment, the pin of elementary winding and the pin of secondary winding can be arranged on the same side of pcb board; And between the pin of the pin of elementary winding and secondary winding, between the pin and secondary winding of elementary winding, and between the pin of elementary winding and secondary winding, be provided with dielectric isolation layer.Perhaps, the pin of the pin of elementary winding and secondary winding is arranged on the both sides (as shown in Figure 8) of pcb board, and between the pin and secondary winding of elementary winding, and between the pin of elementary winding and secondary winding, dielectric isolation layer is set.Even, described as above-mentioned embodiment one, the dielectric isolation layer that between the pin of the pin of elementary winding and secondary winding, also is provided with, thereby, further guarantee the withstand voltage properties of present embodiment flat surface transformer.
Obvious, this elementary pcb board and the structure that is provided with the secondary pcb board arranged crosswise of secondary winding that will be provided with elementary winding can increase the coupling between the primary and secondary winding, reduced leakage inductance, makes electric current be evenly distributed simultaneously, reduces transformer loss.If the turn ratio at elementary winding and secondary winding does not have under the situation of variation, use this kind structure, be about to elementary winding and be divided into two windings that are arranged on two pcb boards, and the pcb board that will be provided with secondary winding is clipped in the middle, and this kind flat surface transformer will be better than the transformer performance of embodiment one.Certainly, this of present embodiment kind of structure also can be used for being provided with more elementary umber of turn, thereby increases the turn ratio of primary and secondary winding, to produce the flat surface transformer with bigger transformation amplitude.
Embodiment three: two in parallel elementary winding branches are located at up and down on two pcb boards; Secondary winding is arranged on the pcb board, and is clipped in the elementary winding centre of two pcb boards up and down.
The circuit diagram of present embodiment, as shown in figure 10; The pcb board stacked structure of present embodiment is identical with embodiment two; The pin arrangement of present embodiment is similar with embodiment two; The insulating barrier of present embodiment and the setting of dielectric isolation layer, identical with embodiment two; This is all given unnecessary details no longer one by one herein.Then, because the turn ratio of elementary winding and secondary winding does not change, the transformation amplitude of present embodiment transformer does not change; But owing to there is the elementary winding of two parallel connections, the electric current by these winding conducting wires can be very big, that is, the flat surface transformer under the present embodiment can become a kind of high-power transformer.
Embodiment four: two secondary winding branches of serial or parallel connection are located at up and down on two pcb boards; Elementary winding is arranged on the pcb board, and is clipped in the secondary winding centre of two pcb boards up and down.
Present embodiment four is reverse utilizations of the foregoing description two and embodiment three, and its circuit diagram is respectively Figure 11 and Figure 12.Because pcb board intersects stacked structure, the layout of pin, being provided with etc. of insulating barrier and dielectric isolation layer is all similar with embodiment three, repeats no more herein.
In like manner, if flat surface transformer of the present utility model adopts four or the pcb board structure of polylith more, and adopt the described insulating barrier plan of establishment of similar the foregoing description, its technique effect is all similar, promptly, a kind of high efficiency that both had can be obtained, the novel planar transformer of capacitive effect can be under very high requirement of withstand voltage, produced again hardly; If further adopt pcb board intersection stacked structure as the described not winding of the same race of above-mentioned embodiment, the connected mode of windings in series of the same race or parallel connection etc., obtained performance is more superior, the flat surface transformer that perhaps has certain specific character.
In a word, the described several execution modes of the foregoing description are not represented all implementations of the utility model; Above embodiment is not to concrete qualification of the present utility model, and all and the similar structure of technical solutions of the utility model all should belong to protection range of the present utility model.
Claims (6)
1, a kind of novel planar transformer, magnetic core and the winding that is arranged on the pcb board have been comprised, it is characterized in that, elementary winding is arranged on the elementary pcb board more than one or one, secondary winding is arranged on another piece or the secondary pcb board more than, and is provided with insulating barrier between elementary pcb board and secondary pcb board.
2, novel planar transformer according to claim 1 is characterized in that, the described elementary pcb board and the secondary pcb board arranged crosswise that is provided with secondary winding that is provided with elementary winding.
3, novel planar transformer according to claim 1 and 2 is characterized in that, is arranged between the elementary winding on two or more than two the elementary pcb board to connect by serial or parallel connection.
4, novel planar transformer according to claim 1 and 2 is characterized in that, is arranged between the secondary winding on two or more than two the secondary pcb board to connect by serial or parallel connection.
5, novel planar transformer according to claim 1 and 2 is characterized in that, the pin of elementary winding and the pin of secondary winding are arranged on the same side of pcb board; Between the pin of the pin of elementary winding and secondary winding, between the pin and secondary winding of elementary winding, and between the pin of elementary winding and secondary winding, be provided with dielectric isolation layer.
6, novel planar transformer according to claim 1 and 2 is characterized in that, the pin of elementary winding and the pin of secondary winding are arranged on the both sides of pcb board; Between the pin of the pin of elementary winding and secondary winding, between the pin and secondary winding of elementary winding, and between the pin of elementary winding and secondary winding, be provided with dielectric isolation layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201960634U CN201138608Y (en) | 2007-12-14 | 2007-12-14 | Novel planar transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201960634U CN201138608Y (en) | 2007-12-14 | 2007-12-14 | Novel planar transformer |
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| CN201138608Y true CN201138608Y (en) | 2008-10-22 |
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| CNU2007201960634U Expired - Fee Related CN201138608Y (en) | 2007-12-14 | 2007-12-14 | Novel planar transformer |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101814837A (en) * | 2010-04-23 | 2010-08-25 | 威海金丰电子有限公司 | PCB (Printed Circuit Board) type switch power supply of ultrathin magnetic core |
| CN102832026A (en) * | 2012-09-19 | 2012-12-19 | 山东电力集团公司济南供电公司 | High-frequency high-pressure high-power density transformer |
| CN103427597A (en) * | 2012-05-15 | 2013-12-04 | 台达电子工业股份有限公司 | Electronic device |
| CN104200980A (en) * | 2014-08-20 | 2014-12-10 | 北京卫星制造厂 | Assembly method for high-power planar transformer |
| CN105099132A (en) * | 2014-04-30 | 2015-11-25 | 台达电子工业股份有限公司 | Electronic device |
| CN105810410A (en) * | 2016-04-17 | 2016-07-27 | 合肥博雷电气有限公司 | High-power planar transformer |
| CN106373733A (en) * | 2016-10-31 | 2017-02-01 | 广安鑫宇电子有限公司 | Adjustable planar transformer and manufacturing method therefor |
| US9837198B2 (en) | 2012-05-15 | 2017-12-05 | Delta Electronics, Inc. | Electronic device |
| US9893536B2 (en) | 2012-05-15 | 2018-02-13 | Delta Electronics, Inc. | Electronic device |
| CN104752044B (en) * | 2013-12-27 | 2018-03-27 | 上海辰竹仪表有限公司 | A kind of explosiveproof isolation transformer |
| CN107946047A (en) * | 2016-10-12 | 2018-04-20 | 赤多尼科两合股份有限公司 | A kind of interlayer winding inductance |
| CN108231374A (en) * | 2016-12-21 | 2018-06-29 | Tdk株式会社 | Coil device |
| WO2018130454A1 (en) * | 2017-01-11 | 2018-07-19 | Kaschke Components Gmbh | Inductive component |
| CN111181404A (en) * | 2019-07-01 | 2020-05-19 | 苏州纳芯微电子股份有限公司 | Isolated power supply chip |
-
2007
- 2007-12-14 CN CNU2007201960634U patent/CN201138608Y/en not_active Expired - Fee Related
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101814837A (en) * | 2010-04-23 | 2010-08-25 | 威海金丰电子有限公司 | PCB (Printed Circuit Board) type switch power supply of ultrathin magnetic core |
| US11616394B2 (en) | 2012-05-15 | 2023-03-28 | Delta Electronics, Inc. | Electronic device |
| US9484145B2 (en) | 2012-05-15 | 2016-11-01 | Delta Electronics, Inc | Converter |
| US9893536B2 (en) | 2012-05-15 | 2018-02-13 | Delta Electronics, Inc. | Electronic device |
| US9837198B2 (en) | 2012-05-15 | 2017-12-05 | Delta Electronics, Inc. | Electronic device |
| CN105186835A (en) * | 2012-05-15 | 2015-12-23 | 台达电子工业股份有限公司 | Electronic device |
| CN103427597B (en) * | 2012-05-15 | 2016-04-13 | 台达电子工业股份有限公司 | Electronic installation |
| CN105186835B (en) * | 2012-05-15 | 2019-07-12 | 台达电子工业股份有限公司 | Electronic device |
| CN103427597A (en) * | 2012-05-15 | 2013-12-04 | 台达电子工业股份有限公司 | Electronic device |
| CN102832026A (en) * | 2012-09-19 | 2012-12-19 | 山东电力集团公司济南供电公司 | High-frequency high-pressure high-power density transformer |
| CN104752044B (en) * | 2013-12-27 | 2018-03-27 | 上海辰竹仪表有限公司 | A kind of explosiveproof isolation transformer |
| CN105099132A (en) * | 2014-04-30 | 2015-11-25 | 台达电子工业股份有限公司 | Electronic device |
| CN104200980A (en) * | 2014-08-20 | 2014-12-10 | 北京卫星制造厂 | Assembly method for high-power planar transformer |
| CN105810410A (en) * | 2016-04-17 | 2016-07-27 | 合肥博雷电气有限公司 | High-power planar transformer |
| CN107946047A (en) * | 2016-10-12 | 2018-04-20 | 赤多尼科两合股份有限公司 | A kind of interlayer winding inductance |
| CN106373733B (en) * | 2016-10-31 | 2017-11-14 | 广安鑫宇电子有限公司 | A kind of adjustable flat surface transformer and its manufacture method |
| CN106373733A (en) * | 2016-10-31 | 2017-02-01 | 广安鑫宇电子有限公司 | Adjustable planar transformer and manufacturing method therefor |
| CN108231374A (en) * | 2016-12-21 | 2018-06-29 | Tdk株式会社 | Coil device |
| WO2018130454A1 (en) * | 2017-01-11 | 2018-07-19 | Kaschke Components Gmbh | Inductive component |
| US11315717B2 (en) | 2017-01-11 | 2022-04-26 | Kaschke Components Gmbh | Inductive component |
| CN111181404A (en) * | 2019-07-01 | 2020-05-19 | 苏州纳芯微电子股份有限公司 | Isolated power supply chip |
| CN111181404B (en) * | 2019-07-01 | 2020-09-18 | 苏州纳芯微电子股份有限公司 | Isolated power supply chip |
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| EXPY | Termination of patent right or utility model |