Patent ID: 12243790

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Hereinafter, semiconductor devices and an inverter device according to the embodiments of the present disclosure will be described with reference to the drawings. Components having the same or corresponding functions may be designated by the same reference numerals, and the description may be omitted.

First Embodiment

FIG.1is a cross-sectional view of a semiconductor device1according to the first embodiment. As illustrated inFIG.1, a wiring board3is provided on a heat sink2. The heat sink2is made of a metal such as Cu or Al, or a composite material such as AlSiC. The wiring board3is provided with a lower surface electrode5provided on the lower surface of the insulating substrate4, and an upper electrode6and an upper electrode7provided on the upper surface of an insulating substrate4. The material of the insulating layer4is, for example, ceramic. Further, the lower surface electrode5is joined to the heat sink2by solder8a, and a semiconductor chip9joined by the solder8bis provided on the upper surface electrode6. The semiconductor chip9is, for example, an Insulated Gate Bipolar Transistor (IGBT), a Metal Oxide Semiconductor Field Effect Transistor (MOSFET) being a field effect transistor, or a diode. Further, the semiconductor chip9is connected to the upper electrode7by a wire10. The case housing11is provided on the heat sink2so as to surround the wiring board3and the semiconductor chip9. The case housing11is made of an engineering plastic such as Poly Phenylene Sulfide (PPS), Polybutylene Terephthalate (PBT) or Polyethylene Terephthalate+Polybutylene Terephthalate (PET+PBT). The upper surface joint portion12of the heat sink2is joined to the opposite lower surface joint portion13of the case housing11by an adhesive14. The adhesive14is a silicone-based or epoxy-based material. Further, in order to ensure the insulating property, the sealing material15fills in the case housing11and covers the wiring board3, the semiconductor chip9, and the wire10. The sealing material15is, for example, a silicone gel or an epoxy resin. An opening16of the case housing11is provided with a lid17to prevent foreign matter from entering. The lid17is made of an engineering plastic such as PPS, PBT or PET+PBT.

FIG.2is an enlarged view of a joint portion18between the heat sink2and the case housing11surrounded by the broken line inFIG.1.

As illustrated inFIG.2, in the heat sink2and the case housing11, the upper surface joint portion12of the heat sink2and the lower surface joint portion13of the case housing11opposing to each other, are adhered to each other by the adhesive14. The lower surface joint portion13of the case housing11is provided with a convex portion19a(first convex portion) so as to surround the periphery of the wiring board3. and the portion19ais in contact with the upper surface joint portion12of the heat sink2so as to surround the wiring board3when the heat sink2and the case housing11are adhered to each other. Further, in the semiconductor device1, assuming that the direction from a heat sink outer edge23toward the wiring board3is the inner direction and the direction from the wiring board3toward the heat sink outer edge23is the outer direction, the sealing material15fills inside the convex portion19a, and the adhesive14is applied to the outside of the convex portion19a, with the convex portion19aserving as a boundary. It should be noted that, inFIG.2, for the sake of simplicity, the convex portion19ais illustrated as a protrusion having a cross-sectional shape of a steep rising edge, however, the shape thereof is not limited thereto, for example, the cross-sectional shape having a gradual rising edge, or a shape in which the contact surface with the upper joint portion12of the heat sink2is in contact with a wider flat surface may be adopted.

In the semiconductor device1configured in this manner, the adhesive14is applied to the outside of the convex portion19awhen the heat sink2and the case housing11are joined to each other. That is, the convex portion19ais configured to separate the adhesive14and the sealing material15, and the convex portion19aserves as a barrier for the adhesive14to direct inward, and this prevents the adhesive14from leaking into the inside the convex portion19a, in which the sealing material15is filled.

As described above, by providing the convex portion19aon the lower surface joint portion13of the case housing11, the leaking of the adhesive14inward is prevented. As a result, a problem caused by the adhesive14leaking inward is prevented; therefore, an effect of suppressing a decrease in yield due to the adhesive14leaking inward is obtained.

Second Embodiment

FIG.3is an enlarged cross-sectional view of a joint portion18according to the second embodiment. As illustrated inFIG.3, the adhesive14is applied to the region surrounded by the convex portion19aprovided on the lower surface joint portion13of the case housing11and a convex portion20b(second convex portion) provided on the upper surface joint portion12of the heat sink2and provided more outside than the convex portion19ais.

In the semiconductor device configured in such a manner, by applying the adhesive14to the region surrounded by the convex portion19aand the convex portion20bwhen the heat sink2and the case housing11are joined, the heat sink2and the case housing11are joined, avoiding the adhesive14intruding into the inside of the semiconductor device, and the convex portion19aserves as a barrier after the joining to prevent the adhesive14from leaking into the inside of the semiconductor device. Further, although in the first embodiment, a single convex portion19ais provided, a plurality of convex portions19amay be provided as illustrated inFIG.3, and in such a case, the adhesive14can be held in the region surrounded by the convex portion19aand the convex portion20b.

Therefore, in addition to the same effect as that of the first embodiment, in the second embodiment, a sealing effect that prevents the intrusion of moisture or the like into the inside of the semiconductor device can be obtained due to the amount of the adhesive14being secured in the region surrounded by the convex portion19aand the convex portion20b.

First Modification of Second Embodiment

FIG.4is an enlarged cross-sectional view of the joint portion18according to the first modification of the second embodiment. In the second embodiment, the convex portion19aprovided on the lower surface joint portion13of the case housing11is provided on the upper surface joint portion12of the heat sink2and the convex portion20bprovided on the upper surface joint portion12of the heat sink2is provided on the lower surface joint portion13of the case housing11, meanwhile, in the first modification of the second embodiment, as illustrated inFIG.4, the adhesive14is applied to a region surrounding by the convex portion19b(second convex portion) provided on the lower surface joint portion13of the case housing11and the convex portion20a(first convex portion) provided on the upper surface joint portion12of the heat sink2are formed.

In the semiconductor device configured in such a manner, by applying the adhesive14to the region surrounded by the convex portion19band the convex portion20awhen the heat sink2and the case housing11are joined, the heat sink2and the case housing11are joined, avoiding the adhesive14intruding into the inside of the semiconductor device, and the convex portion20aserves as a barrier after the joining to prevent the adhesive14from leaking into the inside of the semiconductor device.

Further, as in the second embodiment, the adhesive14can be held in the region surrounded by the convex portion19band the convex portion20a.

Therefore, the same effect as that of the second embodiment can be obtained.

Second Modification of Second Embodiment

FIG.5is an enlarged cross-sectional view of the joint portion18according to the second modification of the second embodiment. The second modification of the second embodiment adopts a configuration in which the two convex portions, the convex portion19aand the convex portion20bin the second embodiment, are provided on the lower surface joint portion13of the case housing11, and as illustrated inFIG.5, the adhesive14is applied to the region surrounded by the convex portion19a(first convex portion) and the convex portion19b(second convex portion) provided on the lower surface joint portion13of the case housing11.

In the semiconductor device configured in such a manner, by applying the adhesive14to the region surrounded by the convex portion19aand the convex portion19bwhen the heat sink2and the case housing11are joined, the heat sink2and the case housing11are joined, avoiding the adhesive14intruding into the inside of the semiconductor device, and the convex portion19aserves as a barrier after the joining to prevent the adhesive14from leaking into the inside of the semiconductor device. Further, as in the second embodiment, the adhesive14can be held in the region surrounded by the convex portion19aand the convex portion19b. Further, even the joined positions between the heat sink2and the case housing11should be misaligned, the distance between the convex portion19aand the convex portion19bdoes not change; therefore, the amount of adhesive can be secured regardless of the misalignment the positions between the heat sink2and the case housing11.

Therefore, the same effect as that of the second embodiment can be obtained regardless of the misalignment of the joined positions between the heat sink2and the case housing11.

Third Modification of Second Embodiment

FIG.6is an enlarged cross-sectional view of the joint portion18according to the third modification of the second embodiment. The third modification of the second embodiment adopts a configuration in which the two convex portions, the convex portion19aand the convex portion20bin the second embodiment, are provided on the upper surface joint portion12of the heat sink2, and as illustrated inFIG.6, the adhesive14is applied to the region surrounded by the convex portion20a(first convex portion) and the convex portion20b(second convex portion) provided on the upper surface joint portion12of the heat sink2.

In the semiconductor device configured in such a manner, by applying the adhesive14to the region surrounded by the convex portion20aand the convex portion20bwhen the heat sink2and the case housing11are joined, the heat sink2and the case housing11are joined, avoiding the adhesive14intruding into the inside of the semiconductor device, and the convex portion20aserves as a barrier after the joining to prevent the adhesive14from leaking into the inside of the semiconductor device. Further, as in the second embodiment, the adhesive14can be held in the region surrounded by the convex portion20aand the convex portion20b. Further, even the joined positions between the heat sink2and the case housing11should be misaligned, the distance between the convex portion20aand the convex portion20bdoes not change; therefore, the amount of adhesive can be secured regardless of the misalignment the positions between the heat sink2and the case housing11.

Therefore, the same effect as that of the second embodiment can be obtained regardless of the misalignment of the joined positions between the heat sink2and the case housing11.

Third Embodiment

FIG.7is an enlarged cross-sectional view of a joint portion18according to the third embodiment. The third embodiment adopts a configuration in which concave portions are provided at the respective positions facing the two convex portions of the convex portion19aand the convex portion20bin the second embodiment, and as illustrated inFIG.7, the lower surface joint portion13of the case housing11is provided with the convex portion19aand a concave portion21band the upper surface joint portion12of the heat sink2is provided with the convex portion20band a concave portion22a. The convex portion19a, the concave portion21b, the convex portion20b, and the concave portion22aare provided at positions where the convex portion19a(first convex portion) and the concave portion22a(first concave portion) are fitted with each other and the convex portion20b(second convex portion) and the concave portion21b(second concave portion) are fitted with each other when the heat sink2and the case housing11are joined to each other. Further, the adhesive14is applied to the region surrounded by the convex portion19aand the convex portion20b.

In the semiconductor device configured in such a manner, by applying the adhesive14to the region surrounded by the convex portion19aand the convex portion20bwhen the heat sink2and the case housing11are joined, the heat sink2and the case housing11are joined, avoiding the adhesive14intruding into the inside of the semiconductor device, and the convex portion19aserves as a barrier after the joining to prevent the adhesive14from leaking into the inside of the semiconductor device. Further, as in the second embodiment, the adhesive14can be held in the region surrounded by the convex portion19aand the convex portion20b. Further, the convex portion19aand the concave portion22aare fitted with each other and the convex portion20band the concave portion21bare fitted with each other, therefore, misalignment of the heat sink2and the case housing11when joined is prevented.

Therefore, in addition to the same effect as that of the second embodiment is obtained, in the third embodiment, the effect of suppressing the decrease in yield due to the misalignment can be obtained because the misalignment when the heat sink2and the case housing11are joined is prevented.

Fourth Embodiment

FIG.8is an enlarged cross-sectional view of a joint portion18according to the fourth embodiment. The fourth embodiment adopts a configuration in which the difference between the depth of the concave portion and the height of the convex portion to be fitted in the third embodiment is made larger, and as illustrated inFIG.8, the lower surface joint portion13of the case housing11is provided with the convex portion19aand the convex portion19b, and the upper surface joint portion12of the heat sink2is provided with the concave portion22a(first concave portion) and a concave portion22b(second concave portion). The convex portion19a, the convex portion19b, the concave portion22a, and the concave portion22bare provided at positions where the convex portion19aand the concave portion22aare fitted with each other and the convex portion19band the concave portion22bare fitted with each other when the heat sink2and the case housing11are joined to each other, and the depth of the concave portion22ais shallow with respect to the height of the convex portion19a, and the depth of the concave portion22bis shallow with respect to the height of the convex portion19b. Further, the adhesive14is applied to the region surrounded by the convex portion19aand the convex portion19b.

In the semiconductor device configured in such a manner, by applying the adhesive14to the region surrounded by the convex portion19aand the convex portion19bwhen the heat sink2and the case housing11are joined, the heat sink2and the case housing11are joined, avoiding the adhesive14intruding into the inside of the semiconductor device, and the convex portion19aserves as a barrier after the joining to prevent the adhesive14from leaking into the inside of the semiconductor device. Further, the depth of the concave portion22aand the concave portion22bis formed to be shallow with respect to the height of the convex portion19aand the convex portion19b; therefore, the region surrounded by the convex portion19aand the convex portion19bcan hold more adhesive14than the region in the third embodiment can. Further, the convex portion19aand the concave portion22aare fitted with each other and the convex portion19band the concave portion22bare fitted with each other; therefore, misalignment of the heat sink2and the case housing11when joined is prevented.

Therefore, in addition to the same effect as that of the third embodiment, in the fourth embodiment, a sealing effect that prevents the intrusion of moisture or the like into the inside of the semiconductor device can be obtained due to the amount of the adhesive14being secured in the region surrounded by the convex portion19aand the convex portion19b.

Fifth Embodiment

FIG.9is an enlarged cross-sectional view of a joint portion18according to the fifth embodiment. The fifth embodiment adopts a configuration in which the adhesive14is applied to the region between the convex portion19band the heat sink outer edge23in the fourth embodiment, and as illustrated inFIG.9, the lower surface joint portion13of the case housing11is provided with the convex portion19aand a concave portion21band the upper surface joint portion12of the heat sink2is provided with the convex portion20band a concave portion22a. The convex portion19a, the concave portion21b, the convex portion20b, and the concave portion22aare provided at positions where the convex portion19aand the concave portion22aare fitted with each other and the convex portion20band the concave portion21bare fitted with each other when the heat sink2and the case housing11are joined to each other, and the depth of the concave portion22ais shallow with respect to the height of the convex portion19a, and the depth of the concave portion21bis shallow with respect to the height of the convex portion20b. Further, the adhesive14is not applied to the region surrounded by the convex portion19aand the convex portion20b, and the adhesive14is applied to the region between the convex portion20bof the upper surface joint portion12of the heat sink2and the heat sink outer edge23.

In the semiconductor device configured in such a manner, by applying the adhesive14to the region between the convex portion20band the heat sink outer edge23when the heat sink2and the case housing11are joined, the heat sink2and the case housing11are joined, avoiding the adhesive14intruding into the inside of the semiconductor device, and the convex portion19aand the convex portion20bserve as barriers after the joining to prevent the adhesive14from leaking into the inside of the semiconductor device. Further, the depth of the concave portion22aand the concave portion22bis formed to be shallow with respect to the height of the convex portion19aand the convex portion20b; therefore, the region between the convex portion20band the heat sink outer edge23can hold adhesive14. Further, the convex portion19aand the concave portion22aare fitted with each other and the convex portion20band the concave portion21bare fitted with each other; therefore, misalignment of the heat sink2and the case housing11when joined is prevented.

Further, even if the adhesive14leaks from the gap between the convex portion20band the concave portion21bdue to processing variation during manufacturing, the leakage of the adhesive14can be stopped in the region surrounded by the convex portion19aand the convex portion20b; therefore, the adhesive14is prevented from leaking into the inside of the convex portion19ain which the sealing material15is filled.

Therefore, in addition to the same effect as that of the fourth embodiment, in the fifth embodiment, the effect of suppressing the decrease in yield can be obtained without tightening of design tolerance.

Sixth Embodiment

FIG.6is an enlarged cross-sectional view of a joint portion18according to the fifth embodiment. The sixth embodiment adopts a configuration in which three or more convex portions are provided and the adhesive14is not applied to the region adjacent to the region in which the sealing material15is filled as in the fifth embodiment, and as illustrated inFIG.10, the lower surface joint portion13of the case housing11is provided with the convex portion19a, the convex portion19b, and a convex portion19c(third convex portion), and the upper surface joint portion12of the heat sink2is provided with the concave portion22a, the concave portion22b, and a concave portion22c(third concave portion). The convex portion19a, the convex portion19b, the convex portion19c, the concave portion22a, the concave portion22band the concave portion22care provided at positions where the convex portion19aand the concave portion22aare fitted with each other, the convex portion19band the concave portion22bare fitted with each other, and the convex portion19cand the concave portion22care fitted with each other when the heat sink2and the case housing11are joined to each other, and the depth of the concave portion22ais shallow with respect to the height of the convex portion19a, the depth of the concave portion22bis shallow with respect to the height of the convex portion19b, and the depth of the concave portion22cis shallow with respect to the height of the convex portion19c. Further, the adhesive14is applied to the region surrounded by the convex portion19band the convex portion19c.

In the semiconductor device configured in such a manner, by applying the adhesive14to the region surrounded by the convex portion19band the convex portion19cwhen the heat sink2and the case housing11are joined, the heat sink2and the case housing11are joined, avoiding the adhesive14intruding into the inside of the semiconductor device, and the convex portion19aand the convex portion19bserve as barriers after the joining to prevent the adhesive14from leaking into the inside of the convex portion19ain which the sealing material15is filled. Further, the depth of the concave portion22a, the concave portion22b, and the concave portion22cis formed to be shallow with respect to the height of the convex portion19a, the convex portion19b, and the convex portion19c; therefore, the region surrounded by the convex portion19band the convex portion19ccan hold more adhesive14than the region in the third embodiment can. Further, the convex portion19aand the concave portion22aare fitted with each other, the convex portion19band the concave portion22bare fitted with each other, and the convex portion19cand the concave portion22care fitted with each other; therefore, misalignment of the heat sink2and the case housing11when joined is prevented.

Further, even if the adhesive14leaks from the gap between the convex portion19band the concave portion22bdue to processing variation during manufacturing, the leakage of the adhesive14can be stopped in the region surrounded by the convex portion19aand the convex portion19b; therefore, the adhesive14is prevented from leaking into the inside of the convex portion19ain which the sealing material15is filled.

Therefore, the same effect as that of the fifth embodiment can be obtained.

Seventh Embodiment

FIG.11is an enlarged cross-sectional view of a joint portion18according to the seventh embodiment. The seventh embodiment adopts a configuration in which a through hole25for allowing the adhesive14to escape to the outside is provided in a convex portion24when the amount of the applied adhesive14is large, and as illustrated inFIG.11, the lower surface joint portion13of the case housing11is provided with the convex portion19aand the concave portion21b, and the upper surface joint portion12of the heat sink2is provided with the convex portion24having the concave portion22aand the through hole25. The convex portion19a, the concave portion21b, the convex portion24, and the concave portion22aare provided at positions where the convex portion19aand the concave portion22aare fitted with each other and the convex portion24and the concave portion21bare fitted with each other when the case housing11and the heat sink2are joined to each other, and the depth of the concave portion22ais shallow with respect to the height of the convex portion19a, and the depth of the concave portion21bis shallow with respect to the height of the convex portion24. Further, the adhesive14is applied to the region surrounded by the convex portion19aand the convex portion24.

In the semiconductor device configured in such a manner, by applying the adhesive14to the region surrounded by the convex portion19aand the convex portion24when the heat sink2and the case housing11are joined, the heat sink2and the case housing11are joined, avoiding the adhesive14intruding into the inside of the semiconductor device, and the convex portion19aserves as a barrier after the joining to prevent the adhesive14from leaking into the inside of the semiconductor device. Further, the depth of the concave portion22aand the concave portion21bis formed to be shallow with respect to the height of the convex portion19aand the convex portion24; therefore, the region surrounded by the convex portion19aand the convex portion24can hold the adhesive14. Further, if the amount of the adhesive14applied to the region surrounded by the convex portion19aand the convex portion24is large, the excess adhesive14is discharged to the outside through the through hole25.

Further, the convex portion19aand the concave portion22aare fitted with each other and the convex portion24and the concave portion21bare fitted with each other; therefore, misalignment of the heat sink2and the case housing11when joined is prevented.

Therefore, in addition to the same effect as that of the fourth embodiment, the effect of suppressing the decrease in yield due to the leakage of the adhesive14into the semiconductor device can be obtained, even if the large amount of adhesive14is applied.

Eighth Embodiment

FIG.12is an enlarged cross-sectional view of a joint portion18according to the eighth embodiment. The eighth embodiment adopts a configuration in which a groove26for allowing the adhesive14to escape is provided in the case housing when the amount of the applied adhesive14is large, and as illustrated inFIG.12, the lower surface joint portion13of the case housing11is provided with the convex portion19a, the concave portion21b, and the groove26, and the upper surface joint portion12of the heat sink2is provided with the convex portion20band the concave portion22a. The convex portion19a, the concave portion21b, the convex portion20b, and the concave portion22aare provided at positions where the convex portion19aand the concave portion22aare fitted with each other and the convex portion20band the concave portion21bare fitted with each other when the heat sink2and the case housing11are joined to each other, and the depth of the concave portion22ais shallow with respect to the height of the convex portion19a, and the depth of the concave portion21bis shallow with respect to the height of the convex portion20b. The groove26is provided between the convex portion19aand the concave portion21b. Further, the adhesive14is applied to the region surrounded by the convex portion19aand the convex portion20b.

In the semiconductor device configured in such a manner, by applying the adhesive14to the region surrounded by the convex portion19aand the convex portion20bwhen the heat sink2and the case housing11are joined, the heat sink2and the case housing11are joined, avoiding the adhesive14intruding into the inside of the semiconductor device, and the convex portion19aserves as a barrier after the joining to prevent the adhesive14from leaking into the inside of the semiconductor device. Further, the depth of the concave portion22aand the concave portion21bis formed to be shallow with respect to the height of the convex portion19aand the convex portion20b; therefore, the region surrounded by the convex portion19aand the convex portion20bcan hold the adhesive14. Further, if the amount of the adhesive14applied to the region surrounded by the convex portion19aand the convex portion20bis large, the excess adhesive14can escape to the groove26.

Further, the convex portion19aand the concave portion22aare fitted with each other and the convex portion20band the concave portion21bare fitted with each other, therefore, misalignment of the heat sink2and the case housing11when joined is prevented.

Therefore, the same effect as that of the seventh embodiment can be obtained.

Ninth Embodiment

FIG.13is an enlarged cross-sectional view of a joint portion18according to the ninth embodiment. The ninth embodiment adopts a configuration in which an air hole27directly connected to the groove26of the eighth embodiment is provided in the case housing11, and the lower surface joint portion13of the case housing11is provided with the convex portion19a, the concave portion21b, and the groove26as illustrated inFIG.13, the case housing11is further provided with the air hole27that is directly connected to the groove26and leads to the outside of the semiconductor device, and the upper surface joint portion12of the heat sink2is provided with the convex portion20band the concave portion22a. The convex portion19a, the concave portion21b, the convex portion20b, and the concave portion22aare provided at positions where the convex portion19aand the concave portion22aare fitted with each other and the convex portion20band the concave portion21bare fitted with each other when the heat sink2and the case housing11are joined to each other, and the depth of the concave portion22ais shallow with respect to the height of the convex portion19a, and the depth of the concave portion21bis shallow with respect to the height of the convex portion20b. The groove26is provided between the convex portion19aand the concave portion21b, and is directly connected to the air hole27. The adhesive14is applied to the region surrounded by the convex portion19aand the convex portion20b.

FIG.14is a plan view in which the formation position of the groove26provided in the lower surface joint portion13of the case housing11when the semiconductor device is viewed from the direction from which the case housing11and the lid17covers is illustrated with a broken line and the positional relationship thereof with the air hole27provided in the case housing11is illustrated. As illustrated inFIG.14, a plurality of air holes27directly connected to the groove26provided in the lower surface joint portion13of the case housing11are provided.

In the semiconductor device configured in such a manner, by applying the adhesive14to the region surrounded by the convex portion19aand the convex portion20bwhen the heat sink2and the case housing11are joined, the heat sink2and the case housing11are joined, avoiding the adhesive14intruding into the inside of the semiconductor device, and the convex portion19aserves as a barrier after the joining to prevent the adhesive14from leaking into the inside of the semiconductor device. Further, the depth of the concave portion22aand the concave portion21bis formed to be shallow with respect to the height of the convex portion19aand the convex portion20b; therefore, the region surrounded by the convex portion19aand the convex portion20bcan hold the adhesive14. Further, if the amount of the adhesive14applied to the region surrounded by the convex portion19aand the convex portion20bis large, the excess adhesive14can escape to the groove26that is directly connected to the air holes27.

Therefore, the air holes27secure escape routes for air; therefore, when the amount of the adhesive14applied to the region surrounded by the convex portion19aand the convex portion20bis large, the adhesive14can more reliably escape to the groove26than that of the seventh embodiment.

Tenth Embodiment

FIG.15is a cross-sectional view of an inverter device28according to the tenth embodiment. The inverter device28illustrated inFIG.15is an inverter device in which fins29are mounted on the heat sink2of the semiconductor device1illustrated in the first embodiment. AlthoughFIG.15illustrates an inverter device using the semiconductor device illustrated in the first embodiment, an inverter device equipped with the semiconductor device illustrated in the first to ninth embodiments may be adopted.

In the inverter device configured as described above, an inverter device having the effect described in the first embodiment can be provided. The inverter devices having the effects shown in the first to the ninth embodiments can be provided by the inverter devices equipped with, not only the semiconductor device illustrated in the first embodiment but also by the semiconductor devices illustrated in the first to the ninth embodiments.

While the disclosure has been shown and described in detail, the foregoing description is in all aspects illustrative and not restrictive. It is therefore understood that numerous modifications and variations can be devised without departing from the scope of the disclosure.