Transition from DAB with SPS DAB-LLC/CLLLC – Resonant Component Design and SPS Control

General
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1

Hello everyone,

I’m currently working with a Dual Active Bridge (DAB) converter model in PLECS, where I’ve implemented Triple Phase Shift (TPS) control. However, I’ve tuned it to effectively operate as a Single Phase Shift (SPS) mode for simplicity in my current study. Now, I’m planning to extend this model by adding a resonant tank between the two bridges, creating a DAB-LLC and also considering a CLLLC topology for further comparison. My goal is to evaluate soft-switching performance, efficiency, and control under variable frequency conditions.

I have a few questions

What is the recommended approach to selecting the resonant inductor (Lr), resonant capacitor (Cr), and magnetizing inductance (Lm) for DAB-LLC and CLLLC topologies?
Could anyone share an example or advice on how to implement variable-frequency control for SPS in PLECS?

  • I’m especially interested in using a frequency modulation approach for power control while maintaining soft switching.

If you have any references (papers, application notes, or example models), I’d be grateful for those as well.

Thanks in advance for your support!
DUAL_ACTIVE_BRIDGE_THERMAL.plecs (259.6 KB)
IMW65R020M2H-plecs.xml (29.4 KB)

2

A few of your questions relate to general power electronics design approaches, which are best discussed with your colleagues although I’d be curious to hear if anyone else on the forum can provide their insights on state of the art practices. I can address your question related to PLECS.

Could anyone share an example or advice on how to implement variable-frequency control for SPS in PLECS?

PLECS has Variable Phase PWM and Variable Frequency PWM modulators built into the component library. For simultaneous control of both variables, I would recommend using one of the modulators from the TI C2000 or STM32 Target Support Library, as described in this forum post. You can also try to build your own modulator out of fundamental components if you need more flexibility. See post 1
and post 2 for ideas.