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DC-Link Capacitor PCB placement

Julio Noel Hermandez
Intellectual 960 points
Other Parts Discussed in Thread: DRV8301, CONTROLSUITE

Hi guys

I am finishing a E-Bike motor drive design. In my design, the DC-Link capacitor is composed by three electrolytic capacitors in order to compensate the maximum current ripple in the DC-Bus. The advantage is the usage of cheap capacitors sacrificing PCB area. In my system, the voltage source is a battery pack (40-58V) and maximum motor current is 30Arms.

Where do you recommend to place the DC-link capacitors, close as possible of each inverter leg (one capacitor per leg) or make capacitor bank between three-phase inverter and DCLink voltage source?

  • 0
    TI__Guru** 114905 points
    Hi Julio,

    If you haven't done so, it is recommended to use the DRV8301 documentation as an example for the schematic and layout.

    All documentation can be found in controlSuite.

    The DRV8301-HC-C2-kit appears to be similar to your application.