Traditional aluminum electrolytic capacitors, limited by high ESR and poor frequency response, often cause DC bus voltage surges, reduce system efficiency, and restrict the performance of SiC-based devices.
(Schematic diagram of the location of the DC-Link capacitor in the inverter, click to enlarge)
(Three-phase Inverter Topology Diagram, click to enlarge)
YMIN’s Film Capacitor Solution
Aluminum electrolytic capacitors usually have a self-resonant frequency of only around 4 kHz and cannot effectively handle high-frequency ripple current. This can lead to bus voltage instability and shorten the lifespan of power semiconductors.
YMIN’s MDP series DC-Link film capacitors address these issues using metallized polypropylene film and an advanced winding process. The result is:
- ESR reduced to the milliohm level, minimizing switching losses;
- Resonant frequency raised to tens of kilohertz, ideal for SiC/MOSFET-based systems;
- Excellent voltage endurance, low leakage, and long operational life.
(Data Verification and Reliability Description, click to enlarge)
Proven Performance
In one 800V e-drive platform from a leading automaker, eight MDP-800V-15μF capacitors replaced twenty-two 450V aluminum electrolytic capacitors. This upgrade cut PCB area by over 50%, reduced DC bus voltage peaks by 40%, and improved peak system efficiency by about 1.5%.
(Recommended Series, click to enlarge)
Conclusion
YMIN’s MDP series capacitors act as compact, high-reliability “voltage stabilizers” for next-generation e-drive platforms.
Their combination of low ESR, high resonance, and long lifespan helps engineers achieve higher system stability and unlock the full potential of high-voltage SiC technology.
Contact us via ymin-sale@ymin.com.
