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LMG3410R070: [Reference Design Request] 3.3kW Bidirectional AC-DC Stage for Hybrid Inverter (Grid-Tied + Island Mode)

Rohan Singhal
Prodigy 50 points

Part Number: LMG3410R070
Other Parts Discussed in Thread: TIDM-02008, PMP23338, TIDM-HV-1PH-DCAC, TIDM-1000

Hi TI Team,

I am currently starting a design for a 3.3kW Single-Phase Hybrid Inverter and I am looking for the most suitable reference design or starting point for the Bidirectional AC-DC power stage.

System Requirements:

  • Application: Hybrid Inverter (Energy Storage System).

  • Power Rating: ~3.3kW.

  • AC Voltage: 230VAC 50Hz.

  • DC Link Voltage: 400V DC.

  • Bidirectional Capability:

    1. Grid-to-DC (Rectifier/PFC Mode): Charging battery from the grid.

    2. DC-to-Grid (Inverter Mode - Grid Following): Injecting power to the grid.

    3. DC-to-Home Load (Inverter Mode - Grid Forming/Island): Powering local loads during grid outages.

My Research & Questions: I have reviewed TIDM-02008 (Bidirectional CCM Totem-Pole PFC with GaN), which seems to cover the Grid-Tied and PFC modes perfectly using the C2000 series.

  1. Does the software/control library in TIDM-02008 support a transition to "Voltage Source" mode (Grid Forming) for standalone home load support?
  2. I was unable to find the source code for TIDM-02008.
  3. I have also gone through PMP23338, but found out that nowhere is bidirectionality mentioned.

Any advice on the best reference design(besides TIDA-02008) to kickstart this development would be appreciated.

Thanks, Rohan

  • 0
    TI__Intellectual 1625 points

    Hello Rohan,

    Thank you for reaching out regarding your 3.3kW Single-Phase Hybrid Inverter design. Your system requirements align well with our C2000 and GaN ecosystems. Below are the specific answers to your queries and recommendations for your development path.
    1. TIDM-02008: Software and Grid-Forming Support
    • Voltage Source Mode: The stock software for TIDM-02008 is primarily designed for Grid-Following (Current Controlled) and PFC modes. It does not natively include a transition state for Grid-Forming (Voltage Controlled) mode required for standalone home load support.
    • Source Code Location: The software for TIDM-02008 has been archived in newer SDK releases. 
    2. PMP23338: Bidirectionality and Hardware Superiority
    • Bidirectionality: Although PMP23338 is marketed as a high-density M-CRPS PFC for server power, it is fully bidirectional. The Totem-Pole topology using LMG3522 GaN FETs is inherently bidirectional.
    • Documentation: In the C2000Ware DigitalPower SDK Technical Guide, it is explicitly stated: "This reference design is bidirectional and works as inverter in grid connected (current controlled) mode."
    • Hardware Choice: PMP23338 is the recommended hardware starting point over TIDM-02008 as it utilizes the latest GaN integration.
    3. Recommended Reference Path for Grid-Forming (Island Mode)
    Since neither PMP23338 nor TIDM-02008 provides out-of-the-box Grid-Forming (Voltage Source) software, we recommend a hybrid approach:
    • Hardware Base: Use PMP23338 for your power stage layout to achieve the 3.3kW/3.6kW rating with the LMG3522 GaN.
    • Control Logic Base: Refer to the TIDM-HV-1PH-DCAC (TIDM-1000). This design provides the software framework for both Grid-Connected and Voltage-Source modes.

    Regards,

    Adithya

  • 0 in reply to Adithya Ankam
    Prodigy 50 points

    Hi Adhtiya,

    Thanks for this helpful response, but I still have some doubts regarding the PMP23338.

    1) I need to know why the baby boost converter is used. (Is it possible to remove that stage?)

    2) Topology before the baby boost converter is totem-pole only?

    3) Can PM23338 be used as TIDA-02008's Bidirectional Interleaved TTPL PFC for different poewr rating?

  • +1 in reply to Rohan Singhal
    TI__Intellectual 1625 points
    Hello,
    Regarding your follow-up questions on the PMP23338:
    1) Baby Boost Purpose & Removal
    The Baby Boost is used in server power supplies to minimize bulk capacitor size while maintaining hold-up time during grid dips. Yes, you can remove it. For your Hybrid Inverter, you can bypass this stage and connect the Totem-Pole output directly to your 400V DC link/battery stage, provided your DC-link capacitance is appropriately sized.
    2) Core Topology
    Yes. Excluding the Baby Boost, the primary stage is a standard Single-Phase CCM Totem-Pole. 
    3) Comparison with TIDA-02008 (Interleaving)
    • PMP23338 is a single-phase (one HF leg) design.
    • TIDA-02008 is an interleaved (two HF legs) design.
      If you require interleaving at 3.3kW, TIDA-02008 is the better architectural reference. However, PMP23338 is the more modern starting point for hardware integration (LMG3522) and sensing accuracy. You can scale PMP23338 by adding a second interleaved leg if necessary.
    Recommendation: Use PMP23338 as your hardware baseline, remove the Baby Boost, and port the Grid-Forming software logic.
    Regards,
    Adithya
  • 0 in reply to Adithya Ankam
    Prodigy 20 points

    Hi Adithya,

    This is Kunal (working in the same team along with Rohan). I had a few follow-up questions based on our discussion:

    1. When you mentioned PMP233308 offers better sensing accuracy, did you mean improved measurement performance for grid-side AC electrical parameters—for example Vrms, Irms, zero-cross detection, phase angle estimation, frequency, and power-related parameters (P/Q/S, PF)?

    2. You also suggested that, from a hardware bring-up / evaluation kit starting point, we should begin with PMP233308 rather than TIDA-02008, even though architecturally TIDA-02008 aligns well with our target system.

      • For quick enablement: is a complete EVM / hardware kit for TIDA-02008 available for purchase? If yes, could you share the recommended part number(s) and the best procurement channel to buy it?

    3. As you noted, PMP233308 is an upgraded solution and its EVM is available (approx. ~$400). However, the user guide indicates that a set of additional EVMs / daughter cards is required to run the full setup.

                                                                

      • We compiled the full list of required TI boards/daughter cards and created a consolidated BOM in an attached Excel sheet.

      • The same sheet also includes the required kits for grid-forming evaluation, specifically TIDM-HV-1PH-DCAC (TIDM-1000).
        Can you please confirm whether the items listed in the Excel are sufficient to fully evaluate and run:

      • PMP233308 EVM, and

      • the recommended grid-forming reference design (TIDM-HV-1PH-DCAC / TIDM-1000)
        without any additional missing boards, adapters, or dependencies?

    4. For the solar inverter MPPT (PV DC-DC) stage in our hybrid inverter, could you recommend a TI reference design / EVM that would be a good fit (MPPT-capable and suitable for hybrid inverter architecture)?

    5. Finally, for procurement and enablement: do you recommend engaging through any TI distribution / IDH / design partner network (e.g., Arrow, Avnet, etc.) that can help with:

      • better availability / bundled procurement,

      • potential FOC/demo support (if applicable), and

      • stronger technical support for bring-up and validation?

    Overall, we are open to building our hybrid inverter MVP primarily on TI platforms, since the available reference designs and evaluation ecosystem look strong for fast prototyping and validation.

    Thanks,
    Kunal Gupta

    +91 8447516009

    kunal@gettobyte.com