CN105118816A - Power terminal and power module employing power terminal - Google Patents
Power terminal and power module employing power terminal Download PDFInfo
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- CN105118816A CN105118816A CN201510526412.3A CN201510526412A CN105118816A CN 105118816 A CN105118816 A CN 105118816A CN 201510526412 A CN201510526412 A CN 201510526412A CN 105118816 A CN105118816 A CN 105118816A
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Abstract
The invention relates to a power terminal and a power module, specifically relates to a power terminal and a power module employing the power terminal, and belongs to the technical field of power electronic devices. According to the technical scheme, the power terminal comprises a power lead-out connector and a connection fastening body threadingly connected with the power lead-out connector, and after the connection fastening body is connected with the power lead-out connector, the connection fastening body and the power lead-out connector are distributed in a coaxial manner. According to the power terminal and the power module employing the power terminal, the overall height of the power module can be obviously reduced, parasitic parameters are reduced, the processing process of the power module is reduced, and dual purposes of improving the performance of the power module and reducing the processing cost of the power module can be achieved.
Description
Technical field
The present invention relates to a kind of power terminal and power model, especially a kind of power terminal and utilize the power model of described power terminal, belong to the technical field of power power electronic device.
Background technology
Power IGBT(igbt), MOSFET(mos field effect transistor) module is the core component of energy saving system and industrial automation system, it is widely used in inverter type welder, electric vehicle controller, the fields such as regenerative resource (solar energy and wind energy), that electric energy is become another kind of form from a kind of formal argument, meet the various needs of power consumption equipment, to reach the object of optimum utilization electric energy, in electric energy transfer process to power model and the eternal requirement of power electronic system be: lightening, high power density, low price and easy to install and use etc., this is also the target of module designer long-sought.
In order to meet above-mentioned lightening, high power density, the low price mentioned and the feature such as easy to install, first of power module design considers that key element is exactly design the modular power terminal of which kind of form, this is because power terminal decides electric connecting mode and the overcurrent capability of power model, affect the size of power model, layout and processing technology, be the major influence factors of power model endophyte parameter, good power terminal design is the key whether power model overall performance reaches design object.
The power terminal lead-out mode of conventional power module mainly contains two kinds: one is that power terminal is inlaid into plastic casing by injection molding manner, then uses aluminum steel connecting circuit structure and power terminal; The another kind of power terminal for band nut, is first directly welded on circuit structure by power terminal, and then will stretch out the described power terminal bending of housing into about 90 degree by the mode of bending, nut is positioned over below the power terminal after bending.
As shown in Figure 1, for the leading-out form of power model common power terminal, power leading-out terminal 101 is inlaid on plastic casing 100 by injection moulding, plastic casing 100 and base plate 102 coordinate formation one confined space, in described confined space, with aluminum steel 104, circuit structure 103 and power leading-out terminal 101 are electrically connected.The defect of described lead-out mode is: the conveyance capacity of aluminum steel 104 differs greatly with the power leading-out terminal 101 be made of copper, the resistance of aluminum steel 104 is also large than copper power leading-out terminal 101, too much aluminum steel 104 connects, the current unevenness between aluminum steel 104 can be caused even, and current unevenness easily causes the local overheating of circuit structure 103, the scorification of circuit structure 103 and aluminum steel 104 time serious, can be caused.Meanwhile, in aluminum steel 104, can produce higher electromagnetic field by big current, because the interval between each aluminum steel 104 is little, the strong mechanical force caused by described high electromagnetic field produces between aluminum steel 104, thus affects the reliability of aluminum steel 104 weld.
In addition, also self-induction and mutual inductance can be produced between many aluminum steels 104, this stray inductance can increase transient voltage Vovershoot, when transient voltage Vovershoot and supply voltage VDD sum are greater than the voltage that power model can bear, can cause module over-voltage breakdown and lose efficacy.In addition; this inserted terminal adds manufacture difficulty and the cost of plastic casing 100; the power leading-out terminal 101 be bumped into can because the problem in coupling gap causes surface to have more plastics overlap and flash to produce in plastic casing 100 injection moulding process; simultaneously for making the smooth demoulding of plastic casing 100 can spray into appropriate release agent etc. before and after punching be moulded; in addition transport and storage problem; this pollution and the oxidative phenomena of inlaying form are caused in capital, have influence on follow-up processes difficulty and the reliability of product.
As shown in Figures 2 and 3, for the another kind of leading-out form of power model common power terminal, particularly, power leading-out terminal 101 is directly welded on circuit structure 103, power leading-out terminal 101 stretches out plastic casing 100 part and is converted into 90 degree by bending jig, nut 105 is put in advance, so that be connected with bringing-out by power leading-out terminal 101 subsequently through screw below power leading-out terminal 101.The defect of described lead-out mode is: power leading-out terminal 101 needs to carry out bending technique, but the bending dynamics of power leading-out terminal 101 and angle wayward, power leading-out terminal 101 after bending is difficult to into an angle of 90 degrees (see figure 3) of standard, make bending technique requirement higher, power leading-out terminal 101 may crack at bending part on the one hand, the problem of the increase of local electrical resistance is caused because of the existence of cracks, multiple power leading-out terminals 101 on the other hand after bending are difficult in one plane, this contact resistance that can cause the loose contact of the circuit board in application process and individual power leading-out terminal 101 and cause is excessive, and then cause the superheating phenomenon of local, also the fastness of junction can be had influence on.And the power leading-out terminal 101 that this mode is welded, as run into the bad situation of assembling coupling, power leading-out terminal 101 is the most easily caused to be subject to the restriction of plastic casing 100, and cause power leading-out terminal 101 to be subject to a long-term stress, in addition the stress in Forging Process, the stress of tighten the screws in application process, can cause solder joint to loosen and even come off, have influence on the long-term reliability of module time serious.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of power terminal is provided and utilizes the power model of described power terminal, it obviously can reduce the whole height of power model, reduce parasitic parameter, decrease the manufacturing procedure of power model simultaneously, reach the dual purpose of the processing cost improving power model performance and reduce power model.
According to technical scheme provided by the invention, described power terminal, comprise power draw connector and draw with described power the connection fastener that connector adopts thread connection, described connection fastener and power are drawn after connector is fastenedly connected, and connecting fastener, to draw connector with power be coaxial distribution.
Described power is drawn in connector and is provided with connection internal thread, connect fastener to be provided with and the described fastening external screw thread being connected internal thread and mating, connect fastening physical efficiency to be embedded in power and to draw in connector, and by fastening external screw thread be connected screw-internal thread fit and power and draw connector and be fastenedly connected.
Described fastening external screw thread is positioned at the one end connecting fastener, and the other end end connecting fastener is provided with connection clamp nut, described connection clamp nut and the connected positioning plate interval of fastening external screw thread by being connected on fastener.
The degree of depth of described connection internal thread is 0.3 times ~ 1 times that power draws connector height, and power draws the two ends of connector all in plane.
A kind of power model, comprise heat-radiating substrate and mate with described heat-radiating substrate the shell body be connected, described heat-radiating substrate is provided with power switch circuit, described power switch circuit arranges power terminal, one end of described power terminal is electrically connected with power switch circuit, the other end of power terminal passes outside shell body, its
The described power terminal power comprised for being electrically connected with power switch circuit is drawn connector and is drawn with described power the connection fastener that connector adopts thread connection, described connection fastener and power are drawn after connector is fastenedly connected, and connecting fastener, to draw connector with power be coaxial distribution.
After described power extraction connector passes shell body, it is more than 0.5mm that power draws the connector distance passed between the end of shell body and shell body outer surface.
Described power is drawn in connector and is provided with connection internal thread, connect fastener to be provided with and the described fastening external screw thread being connected internal thread and mating, connect fastening physical efficiency to be embedded in power and to draw in connector, and by fastening external screw thread be connected screw-internal thread fit and power and draw connector and be fastenedly connected.
Described fastening external screw thread is positioned at the one end connecting fastener, and the other end end connecting fastener is provided with connection clamp nut, described connection clamp nut and the connected positioning plate interval of fastening external screw thread by being connected on fastener.
The degree of depth of described connection internal thread is 0.3 times ~ 1 times that power draws connector height, and power draws the two ends of connector all in plane.
Described heat-radiating substrate is cover the one in copper ceramic substrate, copper heat-radiating substrate, aluminum-based copper-clad plate, the copper-clad plate of copper base or aluminium silicon carbide substrate.
Advantage of the present invention: drawn connector by power and be fastenedly connected body and be fastenedly connected and form power terminal, when the power model utilizing described power terminal to be formed, effectively can reduce thickness and the parasitic parameter of power model, the operation of existing power leading-out terminal bending can be saved, reduce processing cost, shorten the encapsulation cycle of power model, easy to install, wide accommodation, safe and reliable.
Accompanying drawing explanation
Fig. 1 is that the one that existing power terminal coordinates with power model implements structural representation.
Fig. 2 is that the another kind that existing power terminal coordinates with power model implements structural representation.
Fig. 3 be existing power terminal coordinate with power model the third implement structural representation.
Fig. 4 is structural representation of the present invention.
Fig. 5 is the A-A cutaway view of Fig. 4.
Fig. 6 is that the one of power terminal of the present invention implements structural representation.
Fig. 7 is that the another kind of power terminal of the present invention implements structural representation.
Fig. 8 is the third enforcement structural representation of power terminal of the present invention.
Fig. 9 is the one enforcement structural representation that power of the present invention draws connector.
Figure 10 is the another kind enforcement structural representation that power of the present invention draws connector.
Description of reference numerals: 1-shell body, 2-power terminal, 3-radiating bottom plate, 4-power switch circuit, 5-power extraction connector, 6-connection internal thread, 7-connection fastener, 8-power terminal hole, the fastening external screw thread of 9-, 10-connected positioning plate, 11-connect clamp nut, 100-plastic casing, 101-power leading-out terminal, 102-base plate, 103-circuit structure, 104-aluminum steel and 105-nut.
Embodiment
Below in conjunction with concrete drawings and Examples, the invention will be further described.
As shown in Fig. 6, Fig. 7, Fig. 8, Fig. 9 and Figure 10: in order to the whole height of power model obviously can be reduced, reduce parasitic parameter, decrease the manufacturing procedure of power model simultaneously, power terminal 2 of the present invention comprises power and draws connector 5 and draw with described power the connection fastener 7 that connector 5 adopts thread connection, described connection fastener 7 and power are drawn after connector 5 is fastenedly connected, and connecting fastener 7 and power, to draw connector 5 be coaxial distribution.
Particularly, power is drawn connector 5 and is connected fastener 7 and all adopts electric conducting material to make, power terminal 2 is drawn connector 5 by power and is drawn by the power link of power switch circuit 4, connects fastener 7 and power and draws after connector 7 is fastenedly connected, can realize conveniently and the connection of outside.Usually, existing power leading-out terminal 101 from inductance value be more than 10nH, the present invention form power terminal 2 only have 1 ~ 2nH from inductance value, thus when power model uses power terminal 2, effectively can improve the parasitic parameter in power model, reduce the electromagnetic interference that power model is subject at work.
Further, described power is drawn in connector 5 to be provided with and is connected internal thread 6, connect fastener 7 to be provided with and the described fastening external screw thread 9 being connected internal thread 6 and mating, connect fastener 7 can be embedded in power and draw in connector 5, and by fastening external screw thread 9 be connected internal thread 6 and coordinate and power is drawn connector 5 and is fastenedly connected.
In the embodiment of the present invention, draw in connector 5 at power the connection endoporus being provided with coaxial distribution, connect internal thread 6 and be distributed on the inwall of connection endoporus.The one end connecting the fastening external screw thread 9 of fastener 7 correspondence formation can be embedded in and connect in endoporus, connect fastener 7 to carry out connection by the connection internal thread 6 that fastening external screw thread 9 and power draw connector 5 and coordinate, thus connection fastener 7 can be realized and power draws being fastenedly connected between connector 5.
Usually, power draws connector 5 can the various ways such as cylindrical, tetragonal body, hexahedron, power draws the cross section of connector 5 can in trapezoidal or polygon etc., and the outer surface that power draws connector 5 can also arrange one or more step, concrete as shown in Fig. 6 ~ Figure 10.In the specific implementation, the shape that power draws connector 5 can be selected as required, be not limited to above-mentioned cited shape, as long as power can be made to draw connector 5 and be connected the reliability be fastenedly connected between fastener 7, and the reliability that guarantee is connected with power switch circuit 4.
The degree of depth of described connection internal thread 6 is 0.3 times ~ 1 times that power draws connector 5 height, and power draws the two ends of connector 5 all in plane.
In the embodiment of the present invention, power is drawn the degree of depth connecting internal thread 6 in connector 5 and is mainly realized and the coupling between the fastening external screw thread 9 being connected fastener 7, can ensure to connect fastener 7 and power to draw and be fastenedly connected reliability between connector 5, can draw after connector 5 is fastenedly connected, by the connection between connection fastener 7 and the power consumption equipment of outside at connection fastener 7 and power again.Power draws the two ends of connector 5 all in plane, be mainly convenient to described power to draw being welded and fixed of connector 5 and power switch circuit 4, and power extraction connector 5 connects with the precision be connected between fastener 7.
Described fastening external screw thread 9 is positioned at the one end connecting fastener 7, and the other end end connecting fastener 7 is provided with and connects clamp nut 11, described connection clamp nut 11 and connected positioning plate 10 interval of fastening external screw thread 9 by being connected on fastener 7.
In the embodiment of the present invention, connect fastener 7 entirety in shaft-like, fastening external screw thread 9 is positioned at the one end connecting fastener 7, the length of fastening external screw thread 9 be connected internal thread 6 and match, the end of fastening external screw thread 9 contacts with connected positioning plate 10, connected positioning plate 10 is rounded, draws after connector 5 is fastenedly connected, drawn the close contact of connector 5 end face by connected positioning plate 10 and power at connection fastener 7 and power.Connect clamp nut 11 and lay respectively at fastening external screw thread 9 both ends being connected fastener 7, connect clamp nut 11 and do not contact with connected positioning plate 10.When specifically using, conveniently can realize connecting fastener 7 and power draw installation and removal between connector 5 by connecting clamp nut 11.
As shown in Figure 4 and Figure 5, when utilizing above-mentioned power terminal 2 to form power model, described power model comprises heat-radiating substrate 3 and mates with described heat-radiating substrate 3 shell body 1 be connected, described heat-radiating substrate 3 is provided with power switch circuit 4, described power switch circuit 4 arranges power terminal 2, one end of described power terminal 2 is electrically connected with power switch circuit 4, and the other end of power terminal 2 passes outside shell body 1
Described power terminal 2 power comprised for being electrically connected with power switch circuit 4 is drawn connector 5 and is drawn with described power the connection fastener 7 that connector 5 adopts thread connection, described connection fastener 7 and power are drawn after connector 5 is fastenedly connected, and connecting fastener 7 and power, to draw connector 5 be coaxial distribution.
In the embodiment of the present invention, described heat-radiating substrate 3 is for covering the one in copper ceramic substrate, copper heat-radiating substrate, aluminum-based copper-clad plate, the copper-clad plate of copper base or aluminium silicon carbide substrate.Described power switch circuit 4 comprises and connects by MOSFET or IGBT correspondence the half-bridge circuit coordinating and formed, chopper circuit, full-bridge circuit or H-bridge circuit, namely power switch circuit 4 is half-bridge circuit, chopper circuit, any one in full-bridge circuit or H-bridge circuit, certainly, power switch circuit 4 can also adopt other form, the concrete form of power switch circuit 4 can be selected to determine as required, described half-bridge circuit, chopper circuit, full-bridge circuit or H-bridge circuit can only be consisted of the one in MOSFET or IGBT, pass through MOSFET, IGBT connects into half-bridge circuit, chopper circuit, the concrete structure of H-bridge circuit or full-bridge circuit is known by the art personnel, repeat no more herein.Certainly, can also form required half-bridge circuit, chopper circuit or full-bridge circuit by other power devices, concrete power device can be selected as required, is specially known by the art personnel, repeats no more herein.
Mate between shell body 1 with heat-radiating substrate 3, to form the accommodation space needed in shell body 1 and between heat-radiating substrate 3, power switch circuit 4 grade is all positioned at accommodation space.Shell body 1 is provided with the power terminal hole 8 of through described shell body 1, draws after connector 5 welds with power switch circuit 4 and passes from accommodation space, be convenient to the connection of the connection fastener 7 outside shell body 1 and power being drawn between connector 5 to make power.
After described power extraction connector 5 passes shell body 1, it is more than 0.5mm that power draws connector 5 distance passed between the end of shell body 1 and shell body 1 outer surface.
In the embodiment of the present invention, when using above-mentioned power terminal 2 to be drawn by power switch circuit 4, form power model the thickness 7mm that can accomplish thick, as long as power terminal 2 exceeds shell body 1 outer surface 0.5mm or more, namely can ensure follow-up effective electrical connection.In addition, when using above-mentioned power terminal 2 to be drawn by power switch circuit 4, under subsequent installation twisting force, be positioned on power switch circuit 4 for bonding power terminal 2 solder suffered by the existing conventional C type of stress ratio, S type and little three orders of magnitude of L-type other, effectively ensure that the joint reliability of solder joint.
When using above-mentioned power terminal 2 to be drawn by power switch circuit 4, power draw connector 5 and be fastenedly connected body 7 capacity of heat transmission than existing C type, the capacity of heat transmission of the power leading-out terminal 101 of S type and L-type is stronger, in use, the overall temperature rise of power model can be made to have dropped 3 DEG C, and thermal resistance is also corresponding to diminish.
When using above-mentioned power terminal 2 to be drawn by power switch circuit 4, power terminal 2 obviously, effectively can improve the parasitic parameter of power model, decrease power model electromagnetic interference at work from inductance value.
The present invention is drawn connector 5 by power and is fastenedly connected body 7 and is fastenedly connected and forms power terminal 2, when the power model utilizing described power terminal 2 to be formed, effectively can reduce thickness and the parasitic parameter of power model, the operation of existing power leading-out terminal 101 bending can be saved, reduce processing cost, shorten the encapsulation cycle of power model, easy to install, wide accommodation, safe and reliable.
Above-described is only the preferred embodiment of the present invention; the invention is not restricted to above embodiment; be appreciated that the oher improvements and changes that those skilled in the art directly derive without departing from the spirit and concept in the present invention or associate all should be thought within protection scope of the present invention.
Claims (10)
1. a power terminal, it is characterized in that: comprise power and draw connector (5) and draw with described power the connection fastener (7) that connector (5) adopts thread connection, described connection fastener (7) and power are drawn after connector (5) is fastenedly connected, and connecting fastener (7) and power, to draw connector (5) be coaxial distribution.
2. power terminal according to claim 1, it is characterized in that: described power is drawn in connector (5) to be provided with and connected internal thread (6), connect fastener (7) to be provided with and the described fastening external screw thread (9) being connected internal thread (6) and mating, connect fastener (7) power can be embedded in draw in connector (5), and by fastening external screw thread (9) be connected internal thread (6) and coordinate and power is drawn connector (5) and is fastenedly connected.
3. power terminal according to claim 2, it is characterized in that: described fastening external screw thread (9) is positioned at the one end connecting fastener (7), the other end end connecting fastener (7) is provided with and connects clamp nut (11), described connection clamp nut (11) and connected positioning plate (10) interval of fastening external screw thread (9) by being connected on fastener (7).
4. power terminal according to claim 2, is characterized in that: the degree of depth of described connection internal thread (6) is 0.3 times ~ 1 times that power draws connector (5) height, and power draws the two ends of connector (5) all in plane.
5. a power model, comprise heat-radiating substrate (3) and mate with described heat-radiating substrate (3) shell body (1) be connected, described heat-radiating substrate (3) is provided with power switch circuit (4), described power switch circuit (4) is arranged power terminal (2), one end of described power terminal (2) is electrically connected with power switch circuit (4), the other end of power terminal (2) passes shell body (1) outward, it is characterized in that:
Described power terminal (2) power comprised for being electrically connected with power switch circuit (4) is drawn connector (5) and is drawn with described power the connection fastener (7) that connector (5) adopts thread connection, described connection fastener (7) and power are drawn after connector (5) is fastenedly connected, and connecting fastener (7) and power, to draw connector (5) be coaxial distribution.
6. power model according to claim 5, it is characterized in that: after described power extraction connector (5) passes shell body (1), it is more than 0.5mm that power draws connector (5) distance passed between the end of shell body (1) and shell body (1) outer surface.
7. power model according to claim 5, it is characterized in that: described power is drawn in connector (5) to be provided with and connected internal thread (6), connect fastener (7) to be provided with and the described fastening external screw thread (9) being connected internal thread (6) and mating, connect fastener (7) power can be embedded in draw in connector (5), and by fastening external screw thread (9) be connected internal thread (6) and coordinate and power is drawn connector (5) and is fastenedly connected.
8. power model according to claim 7, it is characterized in that: described fastening external screw thread (9) is positioned at the one end connecting fastener (7), the other end end connecting fastener (7) is provided with and connects clamp nut (11), described connection clamp nut (11) and connected positioning plate (10) interval of fastening external screw thread (9) by being connected on fastener (7).
9. power model according to claim 7, is characterized in that: the degree of depth of described connection internal thread (6) is 0.3 times ~ 1 times that power draws connector (5) height, and power draws the two ends of connector (5) all in plane.
10. power model according to claim 5, is characterized in that: described heat-radiating substrate (3) is for covering the one in copper ceramic substrate, copper heat-radiating substrate, aluminum-based copper-clad plate, the copper-clad plate of copper base or aluminium silicon carbide substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510526412.3A CN105118816A (en) | 2015-08-25 | 2015-08-25 | Power terminal and power module employing power terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510526412.3A CN105118816A (en) | 2015-08-25 | 2015-08-25 | Power terminal and power module employing power terminal |
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| CN105118816A true CN105118816A (en) | 2015-12-02 |
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| CN201510526412.3A Pending CN105118816A (en) | 2015-08-25 | 2015-08-25 | Power terminal and power module employing power terminal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105529313A (en) * | 2016-02-19 | 2016-04-27 | 无锡新洁能股份有限公司 | Thin type package module suitable for three-terminal power device |
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| CN102738139A (en) * | 2012-06-05 | 2012-10-17 | 嘉兴斯达微电子有限公司 | Novel packaged power module |
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Application publication date: 20151202 |