Filter for power conversion device with parallel power modules

A power conversion device for performing power conversion of input power by controlling turn-on periods of multiple main circuits each having a plurality of power modules, said power conversion device comprising said main circuits in which said plurality of power modules are parallelly connected to each other, and driving circuits for driving the main circuits;

• wherein the plurality of power modules each include a semiconductor switching element, and each two of the plurality of power modules are regarded as a module pair;
• wherein the driving circuits are each provided with:
• at least one driver for generating control signals to be inputted to respective module control terminals of the plurality of power modules;
• and a filter that is connected between said at least one driver and the module control terminals, said filter having, per each said module pair, an impedance characteristic with a peak shape showing an increased impedance in a predetermined specific frequency range;
• and
• wherein the filter has a coupling element per each said module pair, said coupling element being connected between two of the module control terminals and including a capacitor,
• wherein the driving circuits are each provided with a single driver as said at least one driver and control-signal wiring lines for transferring the control signals from an output terminal of the driver to the respective module control terminals of the plurality of power modules;
• wherein, per each said module pair, the coupling element is connected between two of the control-signal wiring lines on their side where the module control terminals are located, and said two control-signal wiring lines are interconnected at a driver-side connection point on their side where the output terminal of the driver is located;
• and
• wherein a series inductance is connected in parallel to the coupling element, said series inductance having an inductance between a connection point at which the coupling element is connected to one of said two control-signal wiring lines and the driver-side connection point, and an inductance between another connection point at which the coupling element is connected to the other one of said two control-signal wiring lines and the driver-side connection point;
• whereby, per each said module pair, the filter has an LC parallel circuit formed by the series inductance and the coupling element.