Power conversion device
View Patent ↗The effect of decreasing the inductance, which cancels the recovery current generated upon the switching operation of the switching element, is enhanced. Provided are a circuit body which has first and second switching elements constituting upper and lower arm circuits and a conductor portions, a metal member, and a relay conductor portion which is arranged to face the metal member with the circuit body interposed therebetween and electrically connected to a terminal connected to any one of conductor portions. An eddy current is induced at the metal member and the relay conductor portion by the recovery current flowing through the conductor portions according to the switching operation of the first and second switching elements.
1. A power conversion device, comprising:
a circuit body comprising: a first switching element which constitutes an upper arm circuit of a power conversion circuit; a second switching element which constitutes a lower arm circuit of the power conversion circuit; and a plurality of conductor portions which transmit an electric current to the first switching element and the second switching element;
a metal member; and
a relay conductor plate which is arranged to face the metal member with the circuit body interposed therebetween and is electrically connected to a terminal connected to any one of the conductor portions,
wherein an eddy current is induced at the metal member and the relay conductor plate by a recovery current flowing through the conductor portions according to switching operation of the first switching element or the second switching element, and
wherein the conductor portions comprises:
a first conductor plate and a second conductor plate which face each other with the first switching element interposed therebetween;
a third conductor plate and a fourth conductor plate which face each other with the second switching element interposed therebetween; and
an intermediate connection portion which connects the second conductor plate and the third conductor plate,
the metal member is arranged to face one of the first conductor plate and the second conductor plate, one of the third conductor plate and fourth conductor plate, and the intermediate connection portion, and
the relay conductor plate is arranged to face at least other of the first conductor plate or the second conductor plate.
2. The power conversion device according to claim 1 , wherein the metal member comprises a heat dissipation member in contact with a coolant.
3. The power conversion device according to claim 1 , wherein the relay conductor plate is arranged to further face other of the third conductor plate or the fourth conductor plate and the intermediate connection portion.
4. The power conversion device according to claim 1 , further comprising a capacitor for smoothing a voltage, wherein the relay conductor plate is connected to the circuit body and the capacitor.
5. The power conversion device according to claim 4 , wherein the terminal comprises a positive DC terminal and a negative DC terminal, and
the relay conductor plate comprises:
a positive bus bar connected to the positive DC terminal and the capacitor;
a negative bus bar connected to the negative DC terminal and the capacitor; and
a sealing resin which seals the positive bus bar and the negative bus bar in a state of being insulated from each other.
6. The power conversion device according claim 1 , wherein the terminal comprises an AC terminal, and
the relay conductor plate is an AC bus bar connected to the AC terminal.