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3phase PFC using load share controller

Other Parts Discussed in Thread: UCC29002

To whom it may concern

Our customer is considering to build 3 phase PFC using 3pcs single phase PFC IC.
They are also thinking using load share controller but they haven't had experience using it.

Could you provide any solution or reference design?

Your reply would be appreciated.

  • Hi,

    The TI range of load share controllers are designed to work with lower voltages than the PFC bus, typically 5V to 12V range.

    The following link, www.ti.com/.../technicaldocuments shows the existing set of reference designs.

    The UCC29002 device Vdd is limited to 15V and the internal CS amplifier designed to sense current across a high side resistor is only rated to Vdd-0.3V.

    Regards

    Peter
  • What is the customer's PFC requirement? Three phase diode rectifiers followed by a dc-dc boost converter results in a power factor of 95% to a resistive load and is a very simple design. Three phase rectification has a much higher PF than single phase. There are also several passive methods for increasing the PFC of three phase circuits without having to resort to paralleling and load-sharing three single phase units. I would not use this method for three phase PFC. The control loop is complicated and current sharing is problematic, especially if the input voltage and frequency range is wide. In my opinion a C2000 MCU coded as SVM PFC rectifier is the best solution. You can get a reference design at the link below:

    www.ti.com/.../TMDSHVMTRPFCKIT

    Chuck

  • I forgot to mention that the TMDSHVMTRPFCKIT development kit also includes a motor control capability which you can ignore.

    Chuck