Power inverter
a technology of power inverter and sealing portion, which is applied in the direction of electrical apparatus construction details, solid-state devices, semiconductor devices, etc., can solve the problems of difficult maintenance of such a power inverter, liquid may leak to the circuit substrate side from the degraded sealed portions, etc., to achieve excellent cooling performance, prevent leakage, and reduce the size of the apparatus
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second embodiment
[0036] Next, the power inverter of the present invention will be described with reference to FIG. 5. FIG. 5 is a sectional view of cooling structure for the semiconductor modules.
first embodiment
[0037] This embodiment differs from the first embodiment in that clamping bolts 106b are provided in the pressure contact areas of the first seal portion 9. It should be noted that for the clamping bolts in the first seal portion 9, through-holes are formed in the heat sink 1, while internal thread holes are formed in the radiating plate 104 but processed so as not to penetrate through the substrate into the case for the semiconductor modules. These bolts chiefly serve to obtain an appropriate surface pressure in the pressure contact areas of the first seal portion and to improve the distribution of surface pressure, thereby further improving the sealing performance. In addition, since the internal thread holes do not penetrate the radiating plate 104, the possibility that the liquid will leak into the semiconductor modules is eliminated.
third embodiment
[0038] the power inverter of the present invention will be described with reference to FIG. 6. FIG. 6 is a sectional view of cooling structure for the semiconductor module.
[0039] This embodiment differs from the first embodiment in that leakage sensors 11 are provided in each groove 6. The leakage sensors 11 detect leakage to issue, for example, an alarm signal to a driver or stop the operation of the power inverter. Also in this case, in order to prevent the pressure of the liquid from being applied to the second seal portion, the groove 6 also has the holes 7 discretely provided at the bottom of the grooves 6, which are in communication with an atmosphere outside the apparatus. With this configuration, it is possible to protect the power inverter before the adverse effects of a failure or the like resulting from the leakage propagate to other parts.
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