Retrofitting Wide Band Gap Devices to Classic Power Modules using Silicon RC Snubbers

Parasitic inductance causes voltage overshoot and oscillations in classic hard-switched commutation cells and power modules. Newly introduced silicon-based resistive capacitors (SiRC) can short the switching cell inside the power module itself and thereby unlink external parasitic inductance. Classic and mechanically robust power modules are now capable of switching large currents with unlimited turn-on and turn-off speed. This approach minimizes voltage spikes and parasitic oscillations without use of integrated or external attached pulse capacitors. Additionally, cutting down switching losses reduces chip area, saves energy and gains power rating of these SiRC-based power modules.