CN205376505U - Inductance lead terminal is hanged down to power module - Google Patents
Inductance lead terminal is hanged down to power module Download PDFInfo
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- CN205376505U CN205376505U CN201620090668.4U CN201620090668U CN205376505U CN 205376505 U CN205376505 U CN 205376505U CN 201620090668 U CN201620090668 U CN 201620090668U CN 205376505 U CN205376505 U CN 205376505U
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- lead terminal
- end foot
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Abstract
The utility model discloses an inductance lead terminal is hanged down to power module, include with power module external power source just, a female lead terminal and the 2nd lead terminal who links to each other that arrange of burden, a lead terminal is including the first lead end foot of a plurality of that connects gradually, first supporting part and first solid connecting portion, the 2nd lead terminal is including the solid connecting portion of a plurality of second lead end foot, second supporting part and the second that connect gradually, a wherein lead terminal's first lead end foot and the 2nd lead terminal's the crisscross setting of second lead end foot. The pin of two terminals is in on the same straight line to reduce the terminal stray inductance, correspondingly, the last copper foil of DBC is designed into staggeredly, in order to realize the interconnection. Positive negative terminal is through adopting parallel intersecting structure, and closure lead terminal return circuit area has reduced the stray inductance of power terminal greatly, is about 11.9nH, only is general power lead terminal's half. Occupy the distance and saved two lead terminal simultaneously on the power module.
Description
Technical field
This utility model relates to the low inductance leads technical field of power model, particularly relates to the low inductance leads terminal of power model.
Background technology
When design power module, in order to make power model meet the high-frequency working condition of big electric current, the stray inductance of the lead terminal of power model should be reduced as far as possible, open and the voltage pulsation of power terminal when turning off to reduce.
The stray inductance of module can be divided into lead terminal stray inductance L1, bonding line stray inductance and L2 and DBC distributed parasitic inductance L3, and triangular mutual inductance, when power model is switched on or off, electric current jumps bust, due to the existence of stray inductance, the positive and negative lead wires terminal of module can produce an induced voltage VL, this voltage is superimposed with the voltage of dc bus, causes module voltage pulsation occur when being switched on or off.Resistance to due to power chip is pressed with certain restriction, if during module switch, current variation is too fast will cause that chip voltage is too high, causes chip failure.
Due to lead terminal Structure Designing Problem in existing power model, cause module to there is bigger stray inductance, limit the further raising of module operating frequency and switching speed.
Therefore, a kind of new technical scheme of necessary proposition is to solve the defect of prior art.
Utility model content
In order to overcome above-mentioned the deficiencies in the prior art, this utility model provides the low inductance leads terminal of power model, and it is by changing shape and the structure of existing power model lead terminal, and relative position, reduce the stray inductance of lead terminal, to realize the high switching speed of power model.
The low inductance leads terminal of the technical scheme is that power model of this utility model, including the first lead terminal being connected with the positive and negative busbar of power model external power source and the second lead terminal, several the first lead end feet, the first support portion and first that the first lead terminal includes being sequentially connected with are solidly connected portion；Several the second lead end feet, the second support portion and second that second lead terminal includes being sequentially connected with are solidly connected portion；Wherein the first lead end foot of the first lead terminal and the second lead end foot of the second lead terminal are crisscross arranged.On the same line, to reduce terminal stray inductance, correspondingly, the Copper Foil on DBC is designed to staggered at the pin place of two terminals, to realize interconnection.Positive and negative terminals, by adopting level crossing structure, reduces power lead terminal loop area, substantially reduces the stray inductance of power terminal, and saves two lead terminals simultaneously and take distance on power model.
Further improvement of the utility model is in that, is additionally provided with the first gap between each two the first lead end foot of the first lead terminal, and the width in each the first gap is more than the width of the second lead end foot arranged in the inner；Being additionally provided with the second gap between each two the second lead end foot of the second lead terminal, the width in each the second gap is more than the width of the first lead end foot set in the inner.
Further improvement of the utility model is in that, several the first lead end feet of the first lead terminal and the second lead terminal and several the second lead end feet form straight line side by side.
Further improvement of the utility model is in that, the first lead end foot and the second lead end foot are connected on power model respectively through ultra-sonic welded.
Further improvement of the utility model is in that, the first lead end foot and the second lead end foot entirety are round and smooth arcuate structure.
Further improvement of the utility model is in that, the first lead end foot of the first lead terminal and the second lead end foot quantity respectively three of the second lead terminal.
Further improvement of the utility model is in that, the first support portion of the first lead terminal and the second lead terminal is arranged in parallel with the second support portion.
Further improvement of the utility model is in that, the material of the first lead terminal and the second lead terminal is copper, and its thickness respectively 0.7 to 1.5mm；Lamination distance between first support portion and the second support portion is 0.5-2.5mm.
Further improvement of the utility model is in that, the edge of the first lead terminal and the second lead terminal is connected with power model respectively through Reflow Soldering, the bevelling, edge of the first lead terminal and the second lead terminal or rounding..
Further improvement of the utility model is in that, the first lead end foot of the first lead terminal, the first support portion and first portion of being solidly connected are continuous bending structure, and the upper surface in the connected portion of first after its bending is coplanar with the upper surface of power model；Second lead end foot of the second lead terminal, the second support portion and second portion of being solidly connected are continuous bending structure, and the upper surface in the connected portion of second after its bending is coplanar with the upper surface of power model.
Compared with prior art, the beneficial effects of the utility model are: this utility model power model lead terminal by pair of parallel side by side+lead terminal of coplanar chi structure forms, including the first lead terminal and the second lead terminal, its relative space position, it is injection molding into the profile after module housing, the part that two-terminal is injection molding into plastics shell have employed parallel side by side configuration, and terminal pins part have employed coplanar chi structure, and terminal pins is connected by ultra-sonic welded with the Copper Foil on DBC.Part except external dc bus, first power terminal and the second power terminal are owing to have employed parallel side by side configuration, and due to both areas, shape is similar, distance is closely, according to electromagnetic theory, owing to the two-terminal sense of current is contrary, the magnetic induction of generation space between terminal is strengthened mutually, cancel out each other in space outside gap, under ensureing the premise of versatility of terminal insulative and installation, the gap between terminal is more little, and the stray inductance of terminal is more little；Similarly, the electric current of terminal pins part is divided into three strands, owing to the adjacent leads sense of current is contrary, although the magnetic induction between adjacent two pins can be strengthened, but there is the direction contrast of the magnetic induction in two pairs of gaps, after cancelling out each other, only the magnetic flux in remaining a piece of gap is effective, this reduces the stray inductance of power terminal.
This utility model adopts positive and negative electrode stack-design, and is embossed in module housing, and compared with conventional design, lead terminal inductance can reduce half；Lead terminal and the connection of DBC, be designed to the alternating structure of dentation；The method adopting ultra-sonic welded, accomplishes to electrically connect by the layers of copper of dentalation with DBC surface；The part that dentalation is connected with module, is designed to arcuation, to reduce the stress of lead terminal；The material of lead terminal is copper or copper alloy.
Due to both the above mechanism so that its stray inductance is greatly reduced, through Numerical Simulation Analysis, the stray inductance of this utility model power model lead terminal is about 11.9nH, comparing universal power module lead terminal, stray inductance is substantially reduced, and is only 1/2nd of universal power lead terminal.
Accompanying drawing explanation
Fig. 1 is the attachment structure schematic diagram of an embodiment of the low inductance leads terminal of power model；
Fig. 2 is the structural representation of the first lead terminal of the embodiment of Fig. 1；
Fig. 3 is the structural representation of the second lead terminal of the embodiment of Fig. 1；
Fig. 4 is the structural representation that the lead terminal of the embodiment of Fig. 1 is connected on power model；
Fig. 5 is traditional power model direct current lead terminal design structure chart；
Fig. 6 is the improvement lead terminal structural representation on traditional power model direct current lead terminal basis；
Wherein:
1-the first lead terminal, 11-the first lead end foot, 12-the first support portion, 13-first is solidly connected portion, 14-the first gap；2-the second lead terminal, 21-the second lead end foot, 22-the second support portion, 23-second is solidly connected portion, 24-the second gap；3-connecting hole；4-power model.
Detailed description of the invention
In order to deepen understanding of the present utility model, below in conjunction with drawings and Examples, this utility model being further illustrated, this embodiment is only used for explaining this utility model, protection domain of the present utility model is not constituted and limits.
As it is shown in figure 5, be power model direct current lead terminal design, it is made up of pair of parallel coplanar power terminal 1 ' and 2 ', due to spacing relatively big, relatively greatly, its stray inductance is bigger for the enclosed area of two-terminal, through Numerical Simulation Analysis, it is 24.2nH that calculating obtains its stray inductance.
In order to reduce the stray inductance of lead terminal, common practice be by terminal between distance reduce, make as shown in Figure 6, by pair of parallel coplanar, and spacing less power terminal 1 ' ' and 2 ' ' composition, but the limited use so played, power terminal shown in Fig. 6, its stray inductance is about 16.7nH, 31% is reduced than the conventional design shown in Fig. 5, owing to having clearance for insulation requirement between power model negative leads terminal, its spacing can not infinitely reduce, therefore, need to adopt new mentality of designing to reduce the stray inductance between positive and negative terminals further.
As shown in 1 and Fig. 4, the low inductance leads terminal of power model, including the first lead terminal 1 and the second lead terminal 2 being connected with the power model 4 positive and negative busbar of external power source, several the first lead end foot 11, first support portions 12 and first that the first lead terminal 1 includes being sequentially connected with are solidly connected portion 13；Several the second lead end foot 21, second support portions 22 and second that second lead terminal 1 includes being sequentially connected with are solidly connected portion 23；Wherein the first lead end foot 11 of the first lead terminal 1 and the second lead end foot 21 of the second lead terminal 2 are crisscross arranged.On the same line, to reduce terminal stray inductance, correspondingly, the Copper Foil on DBC plate is designed to staggered at the pin place of two terminals, to realize interconnection.Positive and negative terminals, by adopting level crossing structure, reduces power lead terminal loop area, substantially reduces the stray inductance of power terminal, and saves two lead terminals simultaneously and take distance on power model.
Shown in Fig. 1, Fig. 2 and Fig. 3, being additionally provided with the first gap 14 between each two the first lead end foot 11 of the first lead terminal 1, the width in each the first gap 14 is more than the width of the second lead end foot 21 arranged in the inner；Being additionally provided with the second gap 24 between each two the second lead end foot 21 of the second lead terminal 2, the width in each the second gap 24 is more than the width of the first lead end foot 11 set in the inner.And several the first lead end feet 11 of the first lead terminal 1 and the second lead terminal 2 and several the second lead end feet 21 form straight line side by side.First lead end foot 11 and the second lead end foot 21 are overall in round and smooth arcuate structure.First lead end foot 11 of the first lead terminal 1 and second lead end foot 21 quantity respectively three of the second lead terminal 2, stray inductance now is minimum.
In the above-described embodiments, the first lead end foot 11 and the second lead end foot 21 are connected on power model respectively through ultra-sonic welded.
In the above-described embodiments, the first support portion 12 and second support portion 22 of the first lead terminal 1 and the second lead terminal 2 are arranged in parallel, and stray inductance reduces accordingly.So that the first lead terminal 1 and the second lead terminal 2 have more simple and direct structure, second lead end foot 21 of the second lead terminal 2 is provided with protuberance 221 to the side of its support portion 22, and protuberance 221 supports the second lead end foot 21 of prominent second support portion 22.
In the above-described embodiments, the material of the first lead terminal 1 and the second lead terminal 2 is copper, and its thickness respectively 0.7 to 1.5mm.Lamination distance between first support portion 12 and the second support portion 22 is 0.5-2.5mm.First lead terminal 1 and the second lead terminal 2 are respectively equipped with a connecting hole 3, are used for connecting external structure.
Additionally, the edge of the first lead terminal 1 and the second lead terminal 2 is connected with power model respectively through Reflow Soldering.First lead end foot the 11, first support portion 12 of the first lead terminal 1 and first is solidly connected portion 13 for continuous bending structure, and the upper surface in the connected portion 13 of first after its bending is coplanar with the upper surface of power model；Second lead end foot the 21, second support portion 22 of the second lead terminal 2 and second is solidly connected portion 23 for continuous bending structure, and the upper surface in the connected portion 23 of second after its bending is coplanar with the upper surface of power model.
In the above-described embodiments, the bevelling, edge of the first lead terminal 1 and the second lead terminal 2 or rounding.
This utility model power model lead terminal by pair of parallel side by side+lead terminal of coplanar chi structure forms, including the first lead terminal and the second lead terminal, its relative space position, it is injection molding into the profile after module housing, the part that two-terminal is injection molding into plastics shell have employed parallel side by side configuration, terminal pins part have employed coplanar chi structure, and terminal pins is connected by ultra-sonic welded with the Copper Foil on DBC.Due to both the above mechanism, its stray inductance is greatly reduced, through Numerical Simulation Analysis, the stray inductance of this utility model power model lead terminal shown in Fig. 3 is about 11.9nH, compare universal power module lead terminal, stray inductance is substantially reduced, and is only 1/2nd of universal power lead terminal.
What embodiment of the present utility model was announced is preferred embodiment; but it is not limited thereto; those of ordinary skill in the art; very easily according to above-described embodiment; understand spirit of the present utility model; and make different amplifications and change, but as long as without departing from spirit of the present utility model, all in protection domain of the present utility model.
Claims (10)
1. the low inductance leads terminal of power model, including the first lead terminal (1) being connected with the positive and negative busbar of power model (4) external power source and the second lead terminal (2), several first lead ends foot (11), the first support portion (12) and first that described first lead terminal (1) includes being sequentially connected with are solidly connected portion (13)；Several second lead ends foot (21), the second support portion (22) and second that described second lead terminal (1) includes being sequentially connected with are solidly connected portion (23)；It is characterized in that: the first lead end foot (11) of wherein said first lead terminal (1) and the second lead end foot (21) of the second lead terminal (2) are crisscross arranged.
2. the low inductance leads terminal of power model according to claim 1, it is characterized in that: be additionally provided with the first gap (14) between each two the first lead end foot (11) of described first lead terminal (1), the width of each described first gap (14) is more than the width of the second lead end foot (21) arranged in the inner；Being additionally provided with the second gap (24) between each two the second lead end foot (21) of described second lead terminal (2), the width of each described second gap (24) is more than the width of the first lead end foot (11) set in the inner.
3. the low inductance leads terminal of power model according to claim 2, it is characterised in that: several first lead ends foot (11) and several second lead ends foot (21) of described first lead terminal (1) and the second lead terminal (2) form straight line side by side.
4. the low inductance leads terminal of power model according to claim 3, it is characterised in that: described first lead end foot (11) and the second lead end foot (21) are connected on power model respectively through ultra-sonic welded.
5. the low inductance leads terminal of power model according to claim 4, it is characterised in that: described first lead end foot (11) and the second lead end foot (21) are overall in round and smooth arcuate structure.
6. the low inductance leads terminal of power model according to claim 5, it is characterised in that: the first lead end foot (11) of described first lead terminal (1) and second lead end foot (21) quantity respectively three of the second lead terminal (2).
7. the low inductance leads terminal of power model according to claim 6, it is characterised in that: first support portion (12) of described first lead terminal (1) and the second lead terminal (2) is arranged in parallel with the second support portion (22).
8. the low inductance leads terminal of power model according to claim 7, it is characterised in that: the material of described first lead terminal (1) and the second lead terminal (2) is copper, and its thickness respectively 0.7 to 1.5mm；Lamination distance between described first support portion (12) and the second support portion (22) is 0.5-2.5mm.
9. the low inductance leads terminal of power model according to any one in claim 1,2,3,6,7,8, it is characterised in that: the edge of described first lead terminal (1) and the second lead terminal (2) is connected with power model respectively through Reflow Soldering；The bevelling, edge of described first lead terminal (1) and the second lead terminal (2) or rounding.
10. the low inductance leads terminal of power model according to claim 1, it is characterized in that: the first lead end foot (11) of described first lead terminal (1), the first support portion (12) and first are solidly connected portion (13) for continuous bending structure, and the upper surface in the connected portion (13) of first after its bending is coplanar with the upper surface of power model；
Second lead end foot (21) of described second lead terminal (2), the second support portion (22) and second are solidly connected portion (23) for continuous bending structure, and the upper surface in the connected portion (23) of second after its bending is coplanar with the upper surface of power model.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620090668.4U CN205376505U (en) | 2016-01-29 | 2016-01-29 | Inductance lead terminal is hanged down to power module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620090668.4U CN205376505U (en) | 2016-01-29 | 2016-01-29 | Inductance lead terminal is hanged down to power module |
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| CN205376505U true CN205376505U (en) | 2016-07-06 |
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| CN201620090668.4U Active CN205376505U (en) | 2016-01-29 | 2016-01-29 | Inductance lead terminal is hanged down to power module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105514072A (en) * | 2016-01-29 | 2016-04-20 | 南京银茂微电子制造有限公司 | Power module low-inductance lead terminal |
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2016
- 2016-01-29 CN CN201620090668.4U patent/CN205376505U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105514072A (en) * | 2016-01-29 | 2016-04-20 | 南京银茂微电子制造有限公司 | Power module low-inductance lead terminal |
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