Power semiconductor device

Abstract

Emitter electrodes (Es) and collector electrodes (Cs) of elements (101 to 104) are connected to bus electrodes (361 to 364) of a bus bar (351), respectively. The bus bar (351) contains seven layers including four insulating layers (not shown) and three conductive layers (shown) interposed between the insulating layers. Namely, each of the bus electrodes (361 to 364) is connected to one of the conductive layers corresponding to one of a positive electrode (P), a negative electrode (N) and an intermediate electrode (L). The collector electrodes (Cs) of the elements (103 and 104) are connected one over the other to the bus electrode (361). The emitter electrodes (Es) of the elements (103 and 104) are connected one over the other to the bus electrode (362). The collector electrodes (Cs) of the elements (101 and 102) are connected one over the other to the bus electrode (363). The emitter electrodes (Es) of the elements (101 and 102) are connected one over the other to the bus electrode (364).

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a power semiconductor device, and more particularly to a technique of connecting switching elements in parallel which are sealed with resin by the transfer mold process and the like in a power control device and the like. [0003] 2. Description of the Background Art [0004] In general, a power semiconductor element including one switching element (a MOS-FET, a bipolar transistor, an IGBT and the like) which is sealed with resin by the transfer mold process and the like is termed a 1 in 1 type power module. A power conversion device, typically a conventional inverter or converter having the 1 in 1 type power module and a control circuit thereof within, has presented the following problem: namely, a semiconductor substrate and the like included in the control circuit is subjected to strong noise and electromagnetic waves generated by a wiring inductance at the time of switching of the sw...

AI Technical Summary

Benefits of technology

The present invention provides a power conversion device with reduced wiring inductance and packaging area. This is achieved by arranging four resin-sealed switching elements and a bus bar in a specific way, which reduces the number of bus electrodes and the length of the wiring. The insulating property is also enhanced by sealing the switching elements and bus bar together. These technical effects allow for improved performance and efficiency of power conversion devices.

Problems solved by technology

A power conversion device, typically a conventional inverter or converter having the 1 in 1 type power module and a control circuit thereof within, has presented the following problem: namely, a semiconductor substrate and the like included in the control circuit is subjected to strong noise and electromagnetic waves generated by a wiring inductance at the time of switching of the switching element, resulting in a malfunction or a breakdown of the power conversion device.

Another problem with the conventional power conversion device is an increase in the overall packaging area because of a wiring bus bar mounted outside the sealing resin.

Those are thus less-than-optimal structures when they are premised on the use of the 1 in 1 type power module, leaving problems from the viewpoints of wiring inductance, packaging area and the like.

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