Borisevich's state-plane method eliminates 5-72% errors in resonant converters
New closed-form control matches the standard at resonance, but crushes it off-resonance.
Alex Borisevich derived exact closed-form feedforward inversion maps for the dual-bridge series resonant converter (DB SRC) using state-plane trajectory analysis. Compared to the established first harmonic approximation (FHA), the exact state-plane approach eliminates the 5–72% commutation angle errors inherent in FHA-based feedforward for above-resonance operation. The resulting controller architecture mirrors the parallel nonlinear compensation structure of the FHA-based design, with feedforward maps now operating on resonant-time quantities that naturally couple commutation and frequency control. All results are expressed in closed form suitable for real-time implementation.
- Eliminates 5–72% commutation angle errors versus the standard first harmonic approximation (FHA) in above-resonance operation.
- Derives exact, closed-form feedforward inversion maps using state-plane analysis, suitable for real-time implementation.
- Algebraically identical to FHA at resonance frequency, ensuring backward compatibility with existing controller structures.
Why It Matters
More accurate converter control means higher efficiency and reliability in EVs, data centers, and renewable energy systems.