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A Differential Geometric Control Approach for Series Resonant Converter
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DOI：10.1109/tpel.2026.3699446.png)
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Abstract
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Resonant converters are extensively utilized in applications requiring high power density and conversion efficiency. Nevertheless, their control design remains a significant challenge due to the nonlinear characteristics that vary with both switching frequency and operating conditions. This challenge becomes particularly pronounced during transient events, where an aggressive control response may force the converter to lose zero-voltage-switching (ZVS) operation, thereby increasing switching losses and compromising system reliability. In this work, a differential geometric control approach is proposed for series resonant converter that leverages both frequency modulation and phase-shift control to achieve a fast and smooth transient response while maintaining ZVS of the power switches under all operating conditions. A Lie algebraic scheme is proposed to derive the control law, which is shown to ensure globally asymptotically stable across all converter operating conditions, including variations in output voltage setpoints, input voltages, load currents, and switching frequencies. A series of simulations and experimental tests are carried out to validate the proposed method, confirming its capability to maintain accurate ZVS operation during transients as well as under steady-state conditions.
Keywords:
Differential geometric control
hybrid control
resonant converter
soft switching
zero voltage switching (ZVS)
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6.5
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