Power inverter including a power semiconductor module

摘要

A power inverter includes a power semiconductor module that includes a power semiconductor device, a control circuit board that outputs a control signal used for controlling the power semiconductor device, a driver circuit board that outputs a driving signal used for driving the power semiconductor device, a conductive metal base plate arranged in a space between the driver circuit board and the control circuit board in which a fine and long opening portion is formed, wiring that connects the driver circuit board and the control circuit board through the opening portion and delivers the control signal to the driver circuit board, and an AC busbar that is arranged on a side opposite to the metal base plate through the driver circuit board and delivers an AC current output from the power semiconductor module to a drive motor. At least a portion of the AC busbar that faces the opening portion extends in a direction directly running in a longitudinal direction of the fine and long opening portion.

主权项

1. A power inverter comprising:
a power module that includes a power semiconductor device inverting a DC current into an AC current; a control circuit board that outputs a control signal used for controlling the power semiconductor device; a driver circuit board that outputs a driving signal used for driving the power semiconductor device based on the control signal; a conductive base plate arranged in a space between the driver circuit board and the control circuit board in which a wiring opening portion is formed; a control wiring that connects the driver circuit board and the control circuit board through the wiring opening portion and delivers the control signal to the driver circuit board; a conductive casing of a bottomed cylinder shape that has a casing opening potion closed by one face of the base plate and forms a housing space in which the driver circuit board is arranged; a conductive cover body that is fixed to the other face of the base plate and forms a housing space in which the control circuit board is arranged between the base plate and the cover body; and an external connector that includes a lead wiring used for being connected to the control circuit board; wherein the base plate is fixed to the casing such that the one face is brought into contact with a circumferential edge of the casing opening portion; the external connector is arranged such that the lead wiring is connected to the control circuit board through a space between the control circuit board and the base plate; a wall portion surrounding a periphery of the control circuit board is integrally formed on the base plate; and a housing space in which the control circuit board is arranged is formed by fixing the cover body to an upper end of the wall portion.