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Technical Dialogue

Control of Power Electronic Converters

D12.5 - Direct Effective Power Control (D-EPC) for LLC Resonant Converters Operating in Boost Mode using Event-Driven-Timer based Digital Controller

Thursday, March 20, 2025
11:30 AM – 1:30 PM ET
Location: Level One, Hall A3
The LLC converter is a topology using resonance and is effective for miniaturization and high efficiency. Generally, LLC converters use a direct frequency control (DFC) method, which has the problem of slow transient response characteristics. Therefore, power factor control, which directly controls the effective output by bridge circuits (D-EPC), has been proposed. However, it has been adopted only in series resonant operation (buck mode) because of the lack of consideration of the effect of the magnetizing inductance. In this paper, we derived small-signal characteristics considering the effect of magnetizing inductance, showed that D-EPC is effective even in boost mode, and confirm the characteristics by experiments.