CN214705899U - IGBT module and reinforced insulation protection device thereof - Google Patents

Abstract

The utility model relates to an insulating protector of reinforcing and IGBT module of IGBT module, wherein, the insulating protector of reinforcing of IGBT module includes the insulating protector of first insulation guard and second, and the first insulation guard includes first guard plate, is equipped with first back bead, second back bead and third back bead at the back of first guard plate is protruding. The second insulating protection piece comprises a first plate body and a second plate body, wherein a first side convex edge and a second side convex edge are respectively arranged on the inner side surfaces of the first plate body and the second plate body, and a first arc-shaped convex edge is arranged on the first side convex edge. The utility model discloses can effectively solve the problem that current high-power IGBT for rolling stock insulating ability is not enough when the high altitude environment to realize rolling stock with the reinforcing of high-power IGBT insulating ability, satisfy its demand of using under the high altitude environment.

Description

IGBT module and reinforced insulation protection device thereof

Technical Field

The utility model relates to an insulating protection field especially relates to an insulating protector of reinforcing and IGBT module.

Background

An IGBT (Insulated-Gate Bipolar Transistor) is a power electronic device. The high-power IGBT (generally, the IGBT with the voltage of 1200V and the current of more than 500A) is a core component forming an alternating current transmission system of a locomotive vehicle, and the type of the high-power IGBT is selected according to the voltage and the current values in practical application. When the appropriate application voltage class is determined, the selected IGBT has an insulation capacity that is satisfactory for the application, and the insulation capacity described herein refers to the minimum electrical pitch and creepage distance for the particular application voltage class.

Generally, an IGBT manufacturer designs different packages corresponding to different electrical pitches and creepage distances with reference to relevant standard specifications in a product design stage. The high-power IGBT used by the rolling stock generally has three types of packages, namely an IGBT high-power module (hereinafter abbreviated as IHM), an IGBT high-voltage module (hereinafter abbreviated as IHV) and an IGBT high-voltage module high-insulation board (hereinafter abbreviated as IHV high-insulation), and the designed electrical distance and creepage distance of the three types of packages are sequentially increased. The three packaging designs, especially the IHV high insulation packaging, can meet the requirement of the user on the insulation capability, but have the disadvantage that the packaging is designed according to the standard that the altitude is less than 2000m, and under the high altitude environment (the altitude is more than 2000m), because the dielectric strength of the air is reduced, the electrical distance and the creepage distance of the device need to be correspondingly increased, the original packaging design is not suitable for the application in the high altitude environment.

For IGBT devices operating in high altitude environments, the most common approach is to select a device with a higher voltage class and then limit its operating voltage range, i.e., de-rating. However, for high power IGBTs used in rolling stock, there is an upper limit to the voltage class of the devices (the voltage class of the commonly used devices is the highest voltage class that can be achieved by the IGBT devices on the premise of satisfying the required sufficient current capacity). Without higher voltage class devices and keeping the design power unchanged, if the derating method is adopted, the current class of the system will increase, which also means the increase of the volume, weight and design difficulty of the system.

Therefore, the inventor provides the reinforced insulation protection device of the IGBT module and the IGBT module by virtue of experience and practice of related industries for many years, so as to overcome the defects in the prior art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an insulating protector of reinforcing and IGBT module of IGBT module can effectively solve the problem that current high-power IGBT for rolling stock insulating ability is not enough when the high altitude environment to realize the reinforcing of high-power IGBT insulating ability for rolling stock, satisfy its demand of using under the high altitude environment.

The purpose of the utility model can be realized by adopting the following technical scheme:

the utility model provides a reinforced insulation protection device of an IGBT module, which is applied to the IGBT module, the IGBT module comprises an encapsulation shell and a bottom plate which are connected with each other, and a main terminal and a control terminal are arranged on the terminal surface of the encapsulation shell; the main terminals comprise a first row of main terminals and a second row of main terminals which are arranged at intervals, and the control terminals are arranged close to the second row of main terminals and comprise a first auxiliary contact, a second auxiliary contact and a third auxiliary contact; the first row of main terminals and the control terminals are respectively arranged close to the first side surface and the second side surface of the packaging shell, and the third auxiliary contact is arranged close to the third side surface of the packaging shell; the terminal surface is provided with a first end surface groove, a second end surface groove and a third end surface groove, the first end surface groove is positioned between the first row of main terminals and the second row of main terminals, the second end surface groove is positioned between the second row of main terminals and the third auxiliary contact, and the third end surface groove is positioned between the third auxiliary contact and the second auxiliary contact; a side groove is formed in the periphery of the outer side face of the packaging shell, and a plurality of avoidance notches are formed in the first side face and the second side face;

the enhanced insulation protection device of the IGBT module comprises a first insulation protection part and a second insulation protection part; the first insulating protection piece comprises a first protection plate fixedly arranged on the terminal surface, a first back convex rib, a second back convex rib and a third back convex rib are convexly arranged on the back surface of the first protection plate, and the first back convex rib, the second back convex rib and the third back convex rib can be respectively embedded in the first end surface groove, the second end surface groove and the third end surface groove; the second insulating protection piece comprises a first plate body and a second plate body which are connected with each other, a first side convex edge and a second side convex edge are respectively arranged on the inner side surfaces of the first plate body and the second plate body, and a first arc-shaped convex edge is arranged on the first side convex edge; the first plate body is used for being fixedly arranged on the second side face, the second plate body is used for being fixedly arranged on the third side face, and the first side face convex rib, the second side face convex rib and the first arc-shaped convex rib can be respectively embedded in the side face groove on the second side face, the side face groove on the third side face and the avoiding gap on the second side face.

In a preferred embodiment of the present invention, the terminal surface is convexly provided with a first protrusion and a second protrusion, and the first row of main terminals and the second row of main terminals are respectively disposed on the first protrusion and the second protrusion; the back of the first protection plate is further provided with a fourth back convex rib and a fifth back convex rib which can abut against the terminal surface, and the fourth back convex rib and the fifth back convex rib can abut against the side surfaces of the first bulge and the second bulge respectively.

In a preferred embodiment of the present invention, the first front groove is disposed on the front surface of the first protection plate, and the first front groove and the first back rib are opposite to each other.

The utility model discloses an in a preferred embodiment, the positive recess that still offers the second in the front of first guard plate, the positive recess of second is just to the interval setting between second row main terminal and the third auxiliary contact.

The present invention provides a preferable embodiment, wherein a third front groove is further formed on the front surface of the first protection plate, and the third front groove is disposed at an interval between the first row of main terminals and the first side surface.

In a preferred embodiment of the present invention, the first row of main terminals includes at least two first main contacts, and the second row of main terminals includes at least two second main contacts; a first through hole is formed in the first protection plate and located between the first front groove and the third front groove, and the first through hole can be arranged opposite to the first main contact; a second through hole is formed in the first protection plate and located between the first front groove and the second front groove, and the second through hole can be arranged opposite to the second main contact; two third through holes are formed between the second front groove and the side edge of the first protection plate, and the two third through holes can be arranged right opposite to the second auxiliary contact and the third auxiliary contact respectively.

In a preferred embodiment of the present invention, the first insulation protection element further includes a side plate surrounding the first protection plate, and the side plate can be attached to the outer side surface of the package housing.

In a preferred embodiment of the present invention, at least two wire gaps are disposed on the side plate.

In a preferred embodiment of the present invention, the second insulating protection element further includes a third plate connected to the first plate, a third side bead is disposed on the inner side of the third plate, the third plate is configured to be fixed to the fourth side of the package housing, and the third side bead can be embedded in a side groove disposed on the fourth side.

In a preferred embodiment of the present invention, the second insulating protection member further includes a fourth plate connected to the second plate and the third plate, a fourth side rib is provided on an inner side surface of the fourth plate, and a second arc-shaped rib is provided on the fourth side rib; the fourth plate body is used for being fixedly arranged on the first side face, and the fourth side face convex rib and the second arc-shaped convex rib can be respectively embedded in the side face groove on the first side face and the avoiding gap on the first side face.

The utility model also provides an IGBT module, including the insulating protector of reinforcing of foretell IGBT module.

In a preferred embodiment of the present invention, the first row of main terminals includes three first main contacts, and the second row of main terminals includes three second main contacts; or the first row of main terminals comprises two first main contacts and the second row of main terminals comprises two second main contacts.

From the above, the reinforced insulation protection device and the IGBT module in the present invention can form longer electrical distance and creepage distance by the first back rib, the second back rib, and the third back rib respectively complementarily fitting the first end face groove, the second end face groove, and the third end face groove on the package housing in the IGBT module through the fitting of the first insulation protection part and the second insulation protection part, so as to enhance the insulation capability between the corresponding terminals; the side convex edge and the arc convex edge are respectively in complementary fit with a side groove and an avoidance gap on the packaging shell in the IGBT module, so that a longer electrical distance and a longer creepage distance can be formed, and the insulating capability between the corresponding terminal and the bottom plate is enhanced; and then effectively improve the insulating ability of whole IGBT module, especially to the IGBT module of IHV high insulation encapsulation, through addding the utility model provides a reinforcing insulation protection device can constitute reinforcing insulation protection to satisfy the application demand of its high altitude environment, and the IGBT module need not to reduce the price and uses.

Drawings

The drawings are only intended to illustrate and explain the present invention and do not limit the scope of the invention. Wherein:

FIG. 1: is a perspective view of the IGBT module.

FIG. 2: is a top view of the IGBT module.

FIG. 3: is a side view of the second side of the IGBT module.

FIG. 4: is a side view of the fourth side of the IGBT module.

FIG. 5: to the utility model provides a first insulation protection piece from the perspective view of back.

FIG. 6: for the utility model provides a structure chart at the back of first insulation protection spare.

FIG. 7: to the utility model provides a first insulation protection piece from the perspective view of openly.

FIG. 8: for the utility model provides a positive structure chart of first insulation protection spare.

FIG. 9: to the first insulation guard provided by the present invention.

FIG. 10: is the utility model provides a perspective view of second insulating protection spare.

FIG. 11: to the utility model provides a top view of second insulation protection spare.

FIG. 12: another top view of a second insulation guard is provided by the present invention.

FIG. 13: for the utility model provides a perspective view after IGBT module and first insulating protection spare and the assembly of second insulating protection spare.

FIG. 14: for the utility model provides a top view after IGBT module and first insulating protection spare and the assembly of second insulating protection spare.

FIG. 15: for the utility model provides a side view after IGBT module and first insulating protection piece and the assembly of second insulating protection piece.

FIG. 16: fig. 14 is a sectional view taken along the direction a-a.

The reference numbers illustrate:

1. an IGBT module;

11. a package housing; 1101. a first side surface; 1102. a second side surface; 1103. a third side; 1104. a fourth side; 1105. a terminal face; 111. a first end face groove; 112. a second end face groove; 113. a third end surface groove; 114. a side groove; 115. avoiding the notch; 116. a first protrusion; 117. a second protrusion;

12. a base plate; 121. a screw recess;

13. a main terminal; 131. a first row of main terminals; 1311. a first main contact; 132. a second row of main terminals; 1321. a second main contact;

14. a control terminal; 141. a first auxiliary contact; 142. a second auxiliary contact; 143. a third auxiliary contact;

2. a first insulating guard;

21. a first guard plate; 211. a first back face bead; 212. a second back face rib; 213. a third back face bead; 214. a fourth back face bead; 215. a fifth rear face bead; 216. a first front surface groove; 217. a second front surface groove; 218. a third front surface groove; 2191. a first through hole; 2192. a second through hole; 2193. a third through hole; 2194. a square groove;

22. a side plate; 221. a wiring gap;

3. a second insulating guard;

31. a first plate body; 311. a first lateral rib; 312. a first arcuate rib;

32. a second plate body; 321. a second side rib;

33. a third plate body; 331. a third lateral bead;

34. a fourth plate body; 341. a fourth lateral rib; 342. a second arc-shaped rib.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in fig. 1 to 16, the present embodiment provides an enhanced insulation protection device for an IGBT module, which is applied to an IGBT module 1, where the IGBT module 1 includes an encapsulating housing 11 and a bottom plate 12 connected to each other, and a main terminal 13 and a control terminal 14 are provided on a terminal surface 1105 of the encapsulating housing 11. The main terminals 13 include a first row of main terminals 131 and a second row of main terminals 132 arranged at intervals, and the control terminals 14 are arranged adjacent to the second row of main terminals 132 and include a first auxiliary contact 141, a second auxiliary contact 142, and a third auxiliary contact 143. The first row of main terminals 131 and the control terminals 14 are disposed near the first side 1101 and the second side 1102 of the package housing 11, respectively, and the third auxiliary contact 143 is disposed near the third side 1103 of the package housing 11. A first end face groove 111, a second end face groove 112 and a third end face groove 113 are formed in the terminal face 1105, the first end face groove 111 is located between the first row of main terminals 131 and the second row of main terminals 132, the second end face groove 112 is located between the second row of main terminals 132 and the third auxiliary contact 143, and the third end face groove 113 is located between the third auxiliary contact 143 and the second auxiliary contact 142. A side groove 114 is formed around the outer side of the package housing 11, and a plurality of relief notches 115 are formed in both the first side 1101 and the second side 1102.

The enhanced insulation guard of the IGBT module includes a first insulation guard 2 and a second insulation guard 3, the first insulation guard 2 includes a first protection plate 21 for being fixedly disposed on the terminal surface 1105, a first rear rib 211, a second rear rib 212, and a third rear rib 213 are protrudingly disposed on a rear surface of the first protection plate 21, and the first rear rib 211, the second rear rib 212, and the third rear rib 213 can be respectively embedded in the first end surface groove 111, the second end surface groove 112, and the third end surface groove 113. The second insulation protector 3 includes a first plate 31 and a second plate 32 connected to each other, first and second side ribs 311 and 321 are provided on inner side surfaces of the first plate 31 and the second plate 32, respectively, and a first arc-shaped rib 312 is provided on the first side rib 311. The first plate 31 is configured to be fixed on the second side 1102, the second plate 32 is configured to be fixed on the third side 1103, and the first side rib 311, the second side rib 321, and the first arc rib 312 can be respectively embedded in the side groove 114 on the second side 1102, the side groove 114 on the third side 1103, and the avoiding notch 115 on the second side 1102.

The whole IGBT module 1 is a rectangular structure, the package housing 11 is a rectangular box structure with an open bottom, the bottom plate 12 is a rectangular plate and is fixedly disposed at the open bottom of the package housing 11, the first side 1101 of the package housing 11 is opposite to the second side 1102 thereof, and the third side 1103 thereof is opposite to the fourth side 1104 thereof. The bottom plate 12 is provided with a plurality of screw grooves 121, specifically, a plurality of screw grooves 121 are symmetrically formed on two opposite sides of the bottom plate 12, and are used for fastening the bottom plate 12 with other components through screws. The avoiding notch 115 has an arc-shaped groove-shaped structure with two ends penetrating through the terminal surface 1105 and the bottom opening end of the package housing 11, the quantity of the avoiding notch 115 is the same as that of the screw groove 121, and the position of the avoiding notch 115 corresponds to that of the screw groove 121, so as to avoid mounting screws.

The first end face groove 111 is an elongated groove, and two ends of the elongated groove penetrate through the third side 1103 and the fourth side 1104 of the package housing 11, so as to achieve electrical insulation between the first row of main terminals 131 and the second row of main terminals 132. The second end surface groove 112 is an elongated groove, the length direction of which is parallel to the length direction of the first end surface groove 111, and both ends of which are located between the first auxiliary contact 141 and the third side 1103 of the package housing 11, for realizing electrical insulation between the second row of main terminals 132 and the third auxiliary contact 143. The third end-face groove 113 is an elongated groove, the length direction of the third end-face groove 113 is perpendicular to the length direction of the second end-face groove 112, two ends of the third end-face groove are located between the second row of main terminals 132 and the second side 1102 of the package housing 11, and the third end-face groove 113 may be communicated with the second end-face groove 112 (or may not be communicated with the second end-face groove 112 as needed) as shown in fig. 1 and fig. 2, so as to achieve electrical insulation between the second auxiliary contact 142 and the third auxiliary contact 143. The side grooves 114 are annular grooves surrounding the outer side of the package housing 11 for electrically insulating the main terminals 13 and the control terminals 14 from the bottom plate 12.

The first row main terminal 131 includes at least two first main contacts 1311, the second row main terminal 132 includes at least two second main contacts 1321, the first main contacts 1311 are collectors, and the second main contacts 1321 are emitters; a first auxiliary contact 141 is disposed adjacent to the second row of main terminals 132, a second auxiliary contact 142 is disposed adjacent to the first auxiliary contact 141, the first auxiliary contact 141 is an emitter and is connected to the second main contact 1321, the second auxiliary contact 142 is a driver (or gate), and the third auxiliary contact 143 is a collector and is connected to the first main contact 1311. Each main contact and each auxiliary contact are of reed type structures, and each contact can be fastened with other components (such as busbars, cables and the like) by using screws so as to realize electrical connection. The enhanced insulation protection device in the embodiment is mainly applied to the high-power IGBT module mentioned in the background art, and can be applied to IHM packaging, IHV packaging, and IHV high-insulation packaging, and is particularly applicable to IHV high-insulation packaging. The three packages are similar in construction, and the size and number of end and side recesses 114 may vary, and the number of main contacts included in the main terminal 13 may vary for different current levels.

Two current levels are mainly used at present, the lower current level corresponds to the first row of main terminals 131 comprising two first main contacts 1311, and the second row of main terminals 132 comprises two second main contacts 1321; the first row of main terminals 131 corresponding to the higher current level comprises three first main contacts 1311 and the second row of main terminals 132 comprises three first main contacts 1311. The number of the first end surface grooves 111, the second end surface grooves 112, the third end surface grooves 113 and the side surface grooves 114 is determined according to the actual product requirement, for example, in the IHV high insulation package shown in fig. 1, three first end surface grooves 111 arranged in parallel at intervals are provided between the first row of main terminals 131 and the second row of main terminals 132, three second end surface grooves 112 arranged in parallel at intervals are provided between the second row of main terminals 132 and the third auxiliary contact 143, two third end surface grooves 113 arranged in parallel at intervals are provided between the third auxiliary contact 143 and the second auxiliary contact 142, the third end surface grooves 113 are communicated with the corresponding second end surface grooves 112, and four circles of side surface grooves 114 are provided on the outer side surface of the package housing 11.

The first back rib 211, the second back rib 212 and the third back rib 213 are all strip-shaped ribs, and the shapes of the first back rib 211, the second back rib 212 and the third back rib 213 are respectively matched with the shapes of the first end groove 111, the second end groove 112 and the third end groove 113; the complementary fit of the first back rib 211 and the first end groove 111 can increase the electrical distance and creepage distance between the first row of main terminals 131 and the second row of main terminals 132, and further improve the insulating ability between the first row of main terminals 131 and the second row of main terminals 132; the complementary fit of the second rear surface rib 212 and the second end surface groove 112 can increase the electrical distance and creepage distance between the third auxiliary contact 143 and the second row of main terminals 132, and further improve the insulating ability between the third auxiliary contact 143 and the second row of main terminals 132; the complementary fit of the third rear protrusion 213 and the third end groove 113 can increase the electrical distance and creepage distance between the third auxiliary contact 143 and the second auxiliary contact 142, and further improve the insulating ability between the third auxiliary contact 143 and the second auxiliary contact 142; the respective number of the first end face groove 111, the second end face groove 112 and the third end face groove 113 is less than or equal to that of the first end face groove, the second end face groove and the third end face groove, and is determined according to the insulation capacity requirement of an actual product.

The first side ribs 311 and the second side ribs 321 are strip-shaped ribs, and the number of the first side ribs and the number of the second side ribs are less than or equal to that of the side grooves 114, specifically determined according to the insulation capacity requirement of an actual product. The shape of the first side surface convex rib 311 is matched with the shape of the side surface groove 114 part on the second side surface 1102, the number of the first arc-shaped convex ribs 312 on each first side surface convex rib 311 is the same as that of the avoidance gaps 115 on the second side surface 1102, and the shape of the first arc-shaped convex ribs 312 is matched with that of the avoidance gaps 115, so that the electrical distance and the creepage distance between the control terminal 14 and the bottom plate 12 are increased, and the insulating capacity between the control terminal 14 and the bottom plate 12 is further improved; the shape of the second lateral rib 321 matches the shape of the lateral groove 114 on the third lateral surface 1103 to increase the electrical distance and creepage distance between the first main contact 1311 near the third lateral surface 1103 in the first row of main terminals 131, the second main contact 1321 near the third lateral surface 1103 in the second row of main terminals 132, and the third auxiliary contact 143 and the bottom plate 12, and further improve the insulating ability between the first main contact 1311, the second main contact 1321, and the third auxiliary contact 143 and the bottom plate 12.

For example, in the case of the IHV high insulation packaged IGBT module 1 shown in fig. 1, three first back ribs 211 arranged in parallel and at intervals, two second back ribs 212 arranged in parallel and at intervals, and two third back ribs 213 arranged in parallel and at intervals are protruded from the back surface of the first shielding plate 21, and the third back ribs 213 are connected to the corresponding second back ribs 212; three first side-face convex ridges 311 arranged in parallel at intervals and three second side-face convex ridges 321 arranged in parallel at intervals are respectively arranged on the first protection plate 21 and the second protection plate, and four first arc-shaped convex ridges 312 are arranged on each first side-face convex ridge 311. Of course, the number and shape of the first rear rib 211, the second rear rib 212, the third rear rib 213, the first side rib 311, the second side rib 321, and the first arc-shaped rib 312 may be determined according to the package shape of the IGBT module 1, as long as the first rear rib can be matched with the corresponding end surface groove, side surface groove 114, and avoiding notch 115 on the package housing 11, and this embodiment is merely an example.

It should be noted that, the specific structure of the IGBT module 1 is the prior art, the reinforced insulation protection device in this embodiment is mainly used to be fixedly disposed on the IGBT module 1, the back surface of the first protection plate 21 is disposed facing the terminal surface 1105, and the inner side surfaces of the first plate 31 and the second plate 32 respectively face the second side surface 1102 and the third side surface 1103 of the package housing 11, so as to improve the insulation capability of the IGBT module 1.

Thus, the enhanced insulation shield apparatus in this embodiment can form a longer electrical pitch and creepage distance by the cooperation of the first insulation shield 2 and the second insulation shield 3, and the complementary cooperation of the first back rib 211, the second back rib 212, and the third back rib 213 with the first end groove 111, the second end groove 112, and the third end groove 113 on the package housing 11 in the IGBT module 1, respectively, to enhance the insulation capability between the corresponding terminals; by utilizing the complementary fit of the side convex edge and the arc convex edge with the side groove 114 and the avoiding notch 115 on the packaging shell 11 in the IGBT module 1, a longer electrical distance and creepage distance can be formed to enhance the insulating capability between the corresponding terminal and the bottom plate 12; and then effectively improve the insulating ability of whole IGBT module 1, especially to the IGBT module 1 of IHV high insulation encapsulation, through addding the reinforcing insulation protector in this embodiment, can constitute reinforcing insulation protection to satisfy its high altitude environment's application demand, and IGBT module 1 need not to reduce the use of amount.

In a specific implementation manner, as shown in fig. 1 and 5, the terminal surface 1105 is convexly provided with a first protrusion 116 and a second protrusion 117, and the first row of main terminals 131 and the second row of main terminals 132 are respectively provided on the first protrusion 116 and the second protrusion 117. The back surface of the first guard plate 21 is further provided with a fourth back rib 214 and a fifth back rib 215 which can abut against the terminal surface 1105, and the fourth back rib 214 and the fifth back rib 215 can abut against the side surfaces of the first protrusion 116 and the second protrusion 117, respectively.

In this embodiment, both the first protrusion 116 and the second protrusion 117 are a single protrusion, both the first protrusion 116 and the second protrusion 117 are elongated protrusions and are parallel to each other, and both ends of the elongated protrusions are connected to the third side 1103 and the fourth side 1104, respectively. The first main contacts 1311 are arranged at intervals on the first bump 116, and the second main contacts 1321 are arranged at intervals on the second bump 117. The fourth back rib 214 and the fifth back rib 215 are also elongated ribs, the spacing between the fourth back rib 214 and the first back rib 211 is the same as the width of the first protrusion 116, and the spacing between the fifth back rib 215 and the first back rib 211 is the same as the width of the second protrusion 117. When the connector is installed, the back surface of the first protection plate 21 can abut against the top surfaces of the first protrusion 116 and the second protrusion 117 on the terminal surface 1105, the first back surface rib 211 is embedded in the first end surface groove 111, and the fourth back surface rib 214 and the fifth back surface rib 215 abut against the opposite side surfaces of the first protrusion 116 and the second protrusion 117, respectively, so that the electrical distance and the creepage distance between the first row of main terminals 131 and the bottom plate 12 and between the second row of main terminals 132 and the control terminals 14 can be increased, and the insulation capacity between the first row of main terminals 131 and the bottom plate 12 and between the second row of main terminals 132 and the control terminals 14 can be further improved; and the fourth rear ribs 214 and the fifth rear ribs 215 are provided to facilitate the installation.

Further, as shown in fig. 7 and 8, the front surface of the first protection plate 21 is provided with a first front surface groove 216, and the first front surface groove 216 is opposite to the first back surface rib 211, so as to further increase the electrical distance and the creepage distance between the first row of main terminals 131 and the second row of main terminals 132, and further improve the insulating capability between the first row of main terminals 131 and the second row of main terminals 132.

The front surface of the first protection plate 21 is further provided with a second front surface groove 217, the second front surface groove 217 is arranged opposite to the interval between the second row of main terminals 132 and the third auxiliary contacts 143, so that the electric distance and the creepage distance between the third auxiliary contacts 143 and the second row of main terminals 132 are further increased, and the insulating capacity between the third auxiliary contacts 143 and the second row of main terminals 132 is further improved.

A third front groove 218 is further formed in the front surface of the first protection plate 21, and the third front groove 218 is arranged opposite to the first row of main terminals 131 and the first side surface 1101 at an interval, so that the electrical distance and the creepage distance between the first row of main terminals 131 and the bottom plate 12 are increased, and the insulating capability between the first row of main terminals 131 and the bottom plate 12 is improved.

It can be understood that the front face of the first protection plate 21 is opposite to the back face thereof, the first front face groove 216 is located between the second front face groove 217 and the third front face groove 218, the three are strip-shaped grooves and parallel to each other, two ends of the three all run through two side ends of the first protection plate 21, the specific number is determined according to the insulation capacity requirement of an actual product, and the number of the first front face grooves 216 is generally the same as that of the first end face grooves 111. For example, three first front grooves 216, two second front grooves 217 and two third front grooves 218 are formed in parallel at intervals on the front surface of the first shielding plate 21.

Further, in order not to affect the connection of the main terminals 13 and the control terminals 14 to other parts after the first and second insulation guards 2 and 3 are mounted, as shown in fig. 7 and 8, a first through hole 2191 is opened on the first shielding plate 21 between the first and third front grooves 216 and 218, and the first through hole 2191 can be disposed opposite to the first main contact 1311. A second through hole 2192 is formed in the first guard plate 21 and located between the first front surface groove 216 and the second front surface groove 217, and the second through hole 2192 can be arranged opposite to the second main contact 1321. Two third through holes 2193 are opened between the second front surface groove 217 and the side edge of the first guard plate 21, and the two third through holes 2193 can be respectively arranged right opposite to the second auxiliary contact 142 and the third auxiliary contact 143.

The number of the first through holes 2191 is the same as that of the first main contacts 1311, and generally, the first through holes 2191 are round holes to expose the first main contacts 1311, so that the first main contacts 1311 can be connected with other components conveniently. The number of the second through holes 2192 is the same as that of the second main contacts 1321, and generally, the second through holes 2192 are circular holes to expose the second main contacts 1321, so that the second main contacts 1321 can be connected with other components conveniently. The third through hole 2193 is generally a square hole to expose the second auxiliary contact 142 and the third auxiliary contact 143 for avoiding a mounting screw for facilitating connection of the corresponding auxiliary contact with other components. In addition, as shown in fig. 5, a square groove 2194 is formed in the back surface of the first protection plate 21 corresponding to the peripheries of the first through hole 2191 and the second through hole 2192, so that after the first protection plate 21 is mounted on the terminal surface 1105, each main contact can be embedded in the square groove 2194, and the first protection plate 21 can be better matched with the terminal surface 1105.

In practical applications, in order to facilitate the connection and fixation of the first protection plate 21 and the enclosure 11, the first insulation protection member 2 further includes a side plate 22 surrounding the first protection plate 21, and the side plate 22 can abut against the outer side surface of the enclosure 11.

It can be understood that the first protection plate 21 is a rectangular plate body, the side plate 22 is disposed around the side portion of the first protection plate 21 and extends along the front-to-back direction of the first protection plate 21, and the plate surface of the side plate 22 is perpendicular to the plate surface of the first protection plate 21, and the height of the side plate 22 is not too high, and the installation of the second insulation protection member 3 is not affected. When the first protection plate 21 is fixed to the terminal surface 1105, the side plate 22 and/or the first protection plate 21 may be fastened to the package housing 11 by screws or gluing, which is more convenient, and the arrangement of the side plate 22 may also play a role in enhancing the insulation capability between the corresponding terminal and the bottom plate 12.

In addition, at least two routing notches 221 are formed in the side plate 22. For example, in the embodiment, four routing notches 221 are symmetrically formed at positions of the side plate 22 close to the third side 1103 and the fourth side 1104 of the package housing 11, so that each auxiliary contact is used for routing when connecting a wire harness or used for routing related wire harnesses when the IGBT module 1 is fixed to other components.

Further, as shown in fig. 10 and 11, the second insulation guard 3 further includes a third plate 33 connected to the first plate 31, a third lateral rib 331 is provided on an inner lateral surface of the third plate 33, the third plate 33 is configured to be fixedly disposed on the fourth lateral surface 1104 of the package housing 11, and the third lateral rib 331 can be embedded in the lateral groove 114 on the fourth lateral surface 1104. To increase the electrical distance and creepage distance between the first main contact 1311 near the fourth side 1104 in the first row of main terminals 131, the second main contact 1321, the first auxiliary contact 141 and the second auxiliary contact 142 near the fourth side 1104 in the second row of main terminals 132 and the bottom plate 12, and further improve the insulating ability between the first main contact 1311, the second main contact 1321, the first auxiliary contact 141 and the second auxiliary contact 142 and the bottom plate 12.

In a possible embodiment, as shown in fig. 12, the second insulation guard 3 further includes a fourth plate 34 connected to the second plate 32 and the third plate 33, a fourth side rib 341 is provided on an inner side surface of the fourth plate 34, and a second arc-shaped rib 342 is provided on the fourth side rib 341. The fourth plate 34 is configured to be fixedly disposed on the first side 1101, and the fourth side rib 341 and the second arc-shaped rib 342 can be respectively embedded in the side groove 114 on the first side 1101 and the avoiding notch 115 on the first side 1101. To increase the electrical distance and creepage distance between the first row of main terminals 131 and the bottom plate 12, further improving the insulating ability between the first row of main terminals 131 and the bottom plate 12.

Specifically, inner side surfaces of the third plate body 33 and the fourth plate body 34 are disposed facing the fourth side surface 1104 and the first side surface 1101 of the package housing 11, respectively. The third side rib 331 and the fourth side rib 341 are also strip-shaped ribs, and the number of the third side rib and the number of the fourth side ribs are less than or equal to the number of the side grooves 114, which is determined according to the insulation capacity requirement of the actual product. The third lateral rib 331 has a shape that matches the shape of the portion of the lateral groove 114 on the fourth side 1104, and the fourth lateral rib 341 has a shape that matches the shape of the portion of the lateral groove 114 on the first side 1101; the number of the second arc-shaped ribs 342 on each fourth side rib 341 is the same as the number of the avoidance gaps 115 on the first side 1101, and the shape of the second arc-shaped ribs 342 matches the shape of the avoidance gaps 115. For example, in the case of the structure of the IHV high insulation package shown in fig. 1, three third side protruding ribs 331 and three fourth side protruding ribs 341 are disposed on the third board 33 and the fourth board 34, respectively, and four second arc-shaped protruding ribs 342 are disposed on each of the fourth side protruding ribs 341.

It is understood that both the first plate 31 and the second plate 32 of the second insulation guard 3 constitute an L-shaped structure, the first plate 31, the second plate 32 and the third plate 33 constitute a right-angled U-shaped structure, the first plate 31, the second plate 32, the third plate 33 and the fourth plate 34 constitute a quadrangular structure, and the number of the first side ribs 311, the second side ribs 321, the third side ribs 331 and the fourth side ribs 341 are generally the same to better match the shape of the package housing 11. When fixing the second insulating protection member 3 to the package case 11, it may be realized by a screw or an adhesive, or other fixing methods may be adopted.

Further, the present embodiment also provides an IGBT module, including the reinforced insulation protection device of the IGBT module. The insulated protection structure is mainly suitable for a high-power IGBT module, particularly for an IGBT module 1 of IHV high-insulation packaging, and after the first insulation protection part 2 and the second insulation protection part 3 are fixedly arranged on a packaging shell 11 of the IGBT module 1, reinforced insulation protection is formed to meet the application requirement of the high-altitude environment, the insulated protection structure can be applied to a locomotive alternating current transmission system of the high-altitude environment, and the IGBT for the locomotive does not need derating use.

In summary, in the enhanced insulation protection device of the IGBT module and the IGBT module in this embodiment, the first back rib 211, the second back rib 212, and the third back rib 213 on the first protection plate 21 are respectively engaged with the first end groove 111, the second end groove 112, and the third end groove 113 on the terminal surface 1105; the first plurality of rear ribs 211, the second plurality of rear ribs 212, and the third plurality of rear ribs 213 also form a comb-like protrusion structure and can be complementarily fitted with corresponding end surface grooves, thereby achieving enhanced insulation. Meanwhile, the insulation capacity is further enhanced by the fourth rear rib 214 and the fifth rear rib 215 abutting against the side surfaces of the first protrusion 116 and the second protrusion 117 and the first front groove 216, the second front groove 217 and the third front groove 218 of the first shield 21, respectively.

The first arc-shaped rib 312 and the second arc-shaped rib 342 can fill the corresponding avoidance gap 115 by matching each side rib on the second insulating protection piece 3 with the side groove 114 of the packaging shell 11; the first lateral ribs 311, the second lateral ribs 321, the third lateral ribs 331 and the fourth lateral ribs 341 all form a comb-shaped protrusion structure and can be complementarily matched with the lateral grooves 114, so that the enhanced insulation is realized. By utilizing the complementary fit of the first insulating protection part 2 and the second insulating protection part 3 with the corresponding grooves on the packaging shell 11, a longer electrical distance and a longer creepage distance can be formed, the insulating capability of the IGBT module 1 is effectively improved, and the IGBT does not need to be used in a derating manner in a high altitude environment.

The above are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention. Any person skilled in the art should also realize that such equivalent changes and modifications can be made without departing from the spirit and principles of the present invention.

Claims (12)

1. An enhanced insulation protection device of an IGBT module is applied to the IGBT module, the IGBT module comprises a packaging shell and a bottom plate which are connected with each other, and a main terminal and a control terminal are arranged on a terminal surface of the packaging shell; the main terminals comprise a first row of main terminals and a second row of main terminals which are arranged at intervals, and the control terminals are arranged close to the second row of main terminals and comprise a first auxiliary contact, a second auxiliary contact and a third auxiliary contact; the first row of main terminals and the control terminals are respectively arranged close to a first side surface and a second side surface of the packaging shell, and the third auxiliary contact is arranged close to a third side surface of the packaging shell; a first end face groove, a second end face groove and a third end face groove are formed in the terminal face, the first end face groove is located between the first row of main terminals and the second row of main terminals, the second end face groove is located between the second row of main terminals and the third auxiliary contact, and the third end face groove is located between the third auxiliary contact and the second auxiliary contact; a side groove is formed in the periphery of the outer side face of the packaging shell, and a plurality of avoidance notches are formed in the first side face and the second side face; the IGBT module is characterized in that the reinforced insulation protection device of the IGBT module comprises a first insulation protection part and a second insulation protection part;

the first insulating protection piece comprises a first protection plate fixedly arranged on the terminal surface, a first back convex rib, a second back convex rib and a third back convex rib are convexly arranged on the back surface of the first protection plate, and the first back convex rib, the second back convex rib and the third back convex rib can be respectively embedded in the first end surface groove, the second end surface groove and the third end surface groove; the second insulating protection piece comprises a first plate body and a second plate body which are connected with each other, a first side convex edge and a second side convex edge are respectively arranged on the inner side surfaces of the first plate body and the second plate body, and a first arc-shaped convex edge is arranged on the first side convex edge; the first plate body is used for being fixedly arranged on the second side face, the second plate body is used for being fixedly arranged on the third side face, and the first side face convex edge, the second side face convex edge and the first arc-shaped convex edge can be respectively embedded in the side face groove on the second side face, the side face groove on the third side face and the avoiding gap on the second side face.

2. Enhanced insulation protection for IGBT modules according to claim 1,

the terminal surface is convexly provided with a first bulge and a second bulge, and the first row of main terminals and the second row of main terminals are respectively arranged on the first bulge and the second bulge;

the back of the first protection plate is further provided with a fourth back convex rib and a fifth back convex rib which can abut against the terminal surface, and the fourth back convex rib and the fifth back convex rib can abut against the side surfaces of the first bulge and the second bulge respectively.

3. Enhanced insulation protection for IGBT modules according to claim 1,

a first front groove is formed in the front face of the first protection plate, and the first front groove and the first back convex edge are arranged in a right-to-right mode.

4. Enhanced insulation protection for IGBT modules according to claim 3,

and a second front groove is formed in the front surface of the first protection plate and is opposite to the second row of main terminals and the third auxiliary contact in interval arrangement.

5. Enhanced insulation protection for IGBT modules according to claim 4,

the front surface of the first protection plate is further provided with a third front surface groove, and the third front surface groove is opposite to the first row of main terminals and is arranged at intervals between the first side surfaces.

6. Enhanced insulation protection for IGBT modules according to claim 5,

the first row of main terminals comprises at least two first main contacts and the second row of main terminals comprises at least two second main contacts; a first through hole is formed in the first protection plate and located between the first front groove and the third front groove, and the first through hole can be arranged over against the first main contact;

a second through hole is formed in the first protection plate and located between the first front groove and the second front groove, and the second through hole can be arranged opposite to the second main contact; two third through holes are formed between the second front groove and the side edge of the first protection plate, and the two third through holes can be respectively opposite to the second auxiliary contact and the third auxiliary contact.

7. Enhanced insulation protection for IGBT modules according to claim 1,

the first insulation protection part further comprises a side plate arranged around the first protection plate, and the side plate can be attached to the outer side face of the packaging shell in an abutting mode.

8. Enhanced insulation protection for IGBT modules according to claim 7,

at least two routing notches are formed in the side plate.

9. Enhanced insulation protection for IGBT modules according to claim 1,

the second insulating protection piece further comprises a third plate body connected with the first plate body, a third side convex edge is arranged on the inner side face of the third plate body, the third plate body is fixedly arranged on a fourth side face of the packaging shell, and the third side convex edge can be embedded in the side face groove on the fourth side face.

10. Enhanced insulation protection for IGBT modules according to claim 9,

the second insulating protection piece further comprises a fourth plate body connected with the second plate body and the third plate body, wherein a fourth side convex edge is arranged on the inner side surface of the fourth plate body, and a second arc-shaped convex edge is arranged on the fourth side convex edge; the fourth plate body is fixedly arranged on the first side face, and the fourth side face convex rib and the second arc-shaped convex rib can be respectively embedded in the side face groove on the first side face and the avoiding gap on the first side face.

11. An IGBT module characterized by comprising an enhanced insulation protection of the IGBT module according to any one of claims 1 to 10.

12. The IGBT module of claim 11,

the first row of main terminals comprises three first main contacts and the second row of main terminals comprises three second main contacts; or

The first row of main terminals comprises two first main contacts and the second row of main terminals comprises two second main contacts.

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