Power converter with a parallel flat plate conductor electrically connected with a capacitor and a power module
A power converter includes a power module having a positive electrode of a positive-side switching device connected to a first terminal, a negative electrode of the positive-side switching device and a positive electrode of a negative-side switching device connected to a second terminal, and a negative electrode of the negative-side switching device connected to a third terminal. The first terminal is connected to a P terminal of a filter capacitor via a first conductor of a bus bar that is a parallel flat plate conductor. The third terminal is connected to an N terminal of the filter capacitor via a second conductor of the bus bar. The bus bar as the parallel flat plate conductor has an L shape. The second terminal is connected to a load via a conductor bar physically different from the bus bar.
1. A power converter comprising:
a capacitor;
a parallel flat plate conductor including a first part and a second part, the first part and the second part forming an L shape;
a conductor bar; and
a power module including a first terminal, a second terminal, and a third terminal on a surface thereof, a positive electrode of a positive-side switching device being electrically connected to the first terminal, a negative electrode of the positive-side switching device and a positive electrode of a negative-side switching device being electrically connected to the second terminal, a negative electrode of the negative-side switching device being electrically connected to the third terminal,
wherein the first terminal of the power module is electrically connected to a positive electrode of the capacitor via the parallel flat plate conductor, the third terminal of the power module is electrically connected to a negative electrode of the capacitor via the parallel flat plate conductor, and the second terminal of the power module is electrically connected to a load via the conductor bar,
the first part of the parallel flat plate conductor is electrically connected to the power module,
the second part of the parallel flat plate conductor is electrically connected to the capacitor, and
the second part of the parallel flat plate conductor is provided to protrude above the surface of the power module from an end of the first part on a side opposite to the conductor bar.
2. The power converter according to claim 1 , wherein the first terminal and the third terminal are provided on one surface side of a module casing, and are aligned in a direction orthogonal to a longitudinal direction, and the second terminal is disposed on one end side of the module casing in the longitudinal direction of the module casing.
3. The power converter according to claim 2 , wherein
the first terminal, the second terminal, and the third terminal have their respective fastening parts formed in an oblong shape,
a longitudinal direction of the oblong-shaped fastening parts of the first terminal and the third terminal is parallel to the longitudinal direction of the module casing, and
the second terminal is disposed in a manner in which a longitudinal direction of the oblong-shaped fastening part of the second terminal is orthogonal to the longitudinal direction of the module casing.
4. The power converter according to claim 2 , wherein the first terminal and the third terminal are provided in a central portion on the one surface side.
5. The power converter according to claim 4 , wherein the fastening parts of the first terminal, the second terminal, and the third terminal are each provided with two or more fastening points.
6. The power converter according to claim 1 , wherein the parallel flat plate conductor and the conductor bar each have an L shape, and a direction in which the parallel flat plate conductor extends and a direction in which the conductor bar extends are opposite to each other.
7. The power converter according to claim 1 , wherein the parallel flat plate conductor is a laminated bus bar.
8. The power converter according to claim 1 , comprising:
a gate drive circuit to control the power module,
wherein the gate drive circuit is provided on a surface of the second part of the parallel flat plate conductor on a side opposite to the conductor bar.
9. The power converter according to claim 1 , wherein the positive-side switching device and the negative-side switching device are wide-bandgap semiconductor devices.
10. The power converter according to claim 9 , wherein the wide-bandgap semiconductor devices are semiconductor devices made from SiC, a gallium nitride based material, or diamond.