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LMG3410EVM-018: Controlled Rectifier

Sam Ref
Expert 1610 points
Part Number: LMG3410EVM-018
Other Parts Discussed in Thread: TIDM-1007, TIDA-010062, TIDM-02008

Hello,

We have two power-electronics questions about TIDA-00961 & TIDM-1007. These are;

  1. TI Designs: TIDA-00961 (High-Efficiency, 1.6-kW High-Density GaN-Based 1-MHz CrM Totem-Pole PFC Converter Reference Design) is primarily used to rectify AC mains to 400VDC. The question is; can we use that design to rectify the AC mains to 48VDC? Will we still be able to achieve proper PFC?
  2. If the target is to us achieve rectification of the single AC main with adjustable DC output. Do you recommend using TIDA-00961 or TI Designs: TIDM-1007 (Interleaved CCM Totem Pole Bridgeless PFC Reference Design Using C2000™ MCU)?

Regards

Sam

  • 0
    TI__Expert 5120 points

    Sam, sending your inquiry to the design owner for the TIDA-00961.  Unfortunately, the engineer is already out of the office for the weekend as he is in China.  Please allow us another business day to review your question thoroughly and respond. 

    Best Regards

    John Fullilove

    Reference Design Operations

    Texas Instruments

  • 0
    TI__Expert 5920 points

    Hi, Sam

    Thanks for your questions, and glad to help.

    1, TIDA-00961 and TIDM-1007 are both boost PFC, and they could not support 48VDC output. You can use another DC-DC stage, such as LLC, PSFB (Full bridge phase shift), to do that. And, there are multiple reference designs on TI.com.

    2, PFC generally do not target for adjustable output, and its output generally is fixed on 380Vdc ~ 400Vdc, and with much voltage ripple. Same as question 1, two stage structure (PFC + DCDC) is recommended. You could refer to TIDA-010062 as example.

  • 0 in reply to Desheng, Guo
    Expert 1610 points

    Hi Dyson

    Thanks for your clear response. Questions now are;

    1. Will TIDA-010062 allow bi-directional power flow (ie AC to 48VDC and 48VDC to AC)? If not do you have a reference design that all that (ie controlled rectification of the DC side + bi-directional power flow)?
    2. If the DC volt is controllable what is the controlled range (12VDC to 400VDC)?
    3. What is the expected ripple of that design at the DC side?
    4. Can we supply that design with single phase rather than 3-phase?

      Regards

      Sam

  • 0 in reply to Sam Ref
    Expert 1610 points

    Hi Dyson

    I am sorry I meant to say;

    If we implement the design as a three-phase rectifier can we still operate it as a single phase rectifier?

    Regards

    Sam

  • 0 in reply to Sam Ref
    TI__Expert 5920 points


    Sam Ref said:
    • Will TIDA-010062 allow bi-directional power flow (ie AC to 48VDC and 48VDC to AC)? If not do you have a reference design that all that (ie controlled rectification of the DC side + bi-directional power flow)?
    • If the DC volt is controllable what is the controlled range (12VDC to 400VDC)?
    • What is the expected ripple of that design at the DC side?
    • Can we supply that design with single phase rather than 3-phase?

    1. Ans: No, TIDA-010062 is designed uni-directional. for the bi-directional totempole PFC, you could refer TIDM-02008, bi-directional DC-DC could refer to TIDA-00951. 
    2. DC volt is fixed on 12V output in TIDA-010062;
    3. TIDA-010062 ripple volt is expected smaller than 300mV;
    4. TIDA-010062 is single phase input.

  • 0 in reply to Sam Ref
    TI__Expert 5920 points

    Hi, Sam

    It is not easy to implement three-phase rectifier with single phase rectifiers, if there is no Netural Line exist.

    But, if you are 4 wire 3phase system, you can do that.

  • 0 in reply to Desheng, Guo
    Expert 1610 points

    Thanks again Dyson,

    In the attached figure (regenerated from TIDM-02008) are we generating 3-phases (120 degrees shifted) out of a single phase?

    If so why do we do that? 

    You said that design is used for bi-directional power flow. Are these three phases used for both directions of the power flow?

    Regards

    Sam

  • 0 in reply to Sam Ref
    Expert 1610 points

    Dyson

    Are you able to sketch a diagram similar to the attached one when the input power is three-phase not single phase?

    Regards

    Sam

  • 0 in reply to Sam Ref
    TI__Expert 5920 points

    Hi, Sam

    TIDM-02008 is using three phase by 120 degree interleaving, this method is generally accepted to reduce the input current ripple, and reduce the differential inductance of EMI filter.

    You can use TIDM-02008 for three phase input, by spliting the 3 phase combined input into 3 independent inputs, and connecting each of the input to one phase.

  • 0 in reply to Desheng, Guo
    Expert 1610 points

    Hi Dyson,

    • For the design TIDM-02008 if the input is three phase (as per your diagram) do we still need the 2 MOSFETs & their UCC27714D that are connected to the neutral & the DC Bus?

    Regards

    Sam

  • 0 in reply to Sam Ref
    TI__Expert 5920 points

    Hi, Sam

    TIDM-2008 is single phase input reference. You need to modify its hardware to support 3-phase input.

    The fourth leg with MOSFET can be removed, if you know well with the 3-phase PFC control.