Power semiconductor device and power conversion device

A power semiconductor device, comprising:

• a series circuit of a first power semiconductor element for an upper arm of an inverter and a second power semiconductor element for a lower arm of the inverter;
• a first sealing member sealing the series circuit;
• an internal terminal protruding from the first sealing member, for supplying DC power to the series circuit;
• and
• an external wiring including an inner-side external terminal connected to the internal terminal and an outer-side external terminal, wherein:
• the series circuit comprises a first positive conductor plate and a first negative conductor plate that are arranged opposite to each other so that the first power semiconductor element is sandwiched between the first positive conductor plate and the first negative conductor plate, and also comprises a second positive conductor plate and a second negative conductor plate that are arranged opposite to each other so that the second power semiconductor element is sandwiched between the second positive conductor plate and the second negative conductor plate;
• the first positive conductor plate and the first negative conductor plate each have two opposite surfaces, one of which faces toward the first power semiconductor element and the other of which is exposed from the first sealing member;
• the second positive conductor plate and the second negative conductor plate each have two opposite surfaces, one of which faces toward the second power semiconductor element and the other of which is exposed from the first sealing member;
• the first negative conductor plate and the second positive conductor plate are electrically connected with each other;
• the internal terminal comprises a first positive connection terminal formed on the first positive conductor plate, a first negative connection terminal formed on the second negative conductor plate, and a first AC connection terminal formed on the second positive conductor plate;
• the external wiring comprises a positive wiring, a negative wiring and an AC wiring;
• the inner-side external terminal comprises a second positive connection terminal formed on one side of the positive wiring, a second negative connection terminal formed on one side of the negative wiring, and a second AC connection terminal formed on one side of the AC wiring;
• the outer-side external terminal comprises a third positive connection terminal formed on the other side of the positive wiring, a third negative connection terminal formed on the other side of the negative wiring, and a third AC connection terminal formed on the other side of the AC wiring;
• each of the first positive connection terminal, the first negative connection terminal, the first AC connection terminal, the positive wiring, the negative wiring, and the AC wiring has a main surface and a side surface, the respective side surface being perpendicular to and smaller than the respective main surface;
• the first positive connection terminal, the first negative connection terminal, and the first AC connection terminal are aligned along one surface of the first sealing member across a direction along which the first positive conductor plate, the second negative conductor plate and the second positive conductor plate are arranged at their portions protruding from the first sealing member so that the side surfaces of the first positive connection terminal, the first negative connection terminal and the first AC connection terminal are opposite to each other;
• the positive wiring, the negative wiring, and the AC wiring are arranged so that the second positive connection terminal, the second negative connection terminal and the second AC connection terminal are aligned along the first positive connection terminal, the first negative connection terminal and the first AC connection terminal, and are also arranged so that the main surfaces of the positive wiring and the negative wiring are at least partially opposite to each other at the third positive connection terminal and the third negative connection terminal to form a layer structure;
• and
• the first positive connection terminal, the first negative connection terminal, and the first AC connection terminal are connected to the second positive connection terminal, the second negative connection terminal and the second AC connection terminal respectively, such that magnetic fluxes are generated in directions canceling each other out by current flowing in the first positive connection terminal and the first negative connection terminal through each layer of the layer structure of the positive wiring and the negative wiring.