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In this article, a dual-frequency control method for regulating the output power in class-E resonant dc&#x2013;dc converters has been introduced. As in the standard <sc>on</sc>&#x2013;<sc>off</sc> control or other recently proposed dual-frequency controls, the approach is based on the ability of the converter to alternately operate in a high- and a low-power state. The proposed solution has a twofold advantage: on the one hand, soft-switching capabilities (i.e., zero-voltage and zero-voltage-derivative switching) are preserved in both operating states; on the other hand, it is possible to reduce to zero the transient time required to switch from one state to the other one. The most straightforward consequence is the possibility to increase to very large values the frequency at which the two operating states are switched, up to the same order of magnitude as the main switching frequency of the converter. In this way, the additional ripple introduced by the proposed dual-frequency control can be decreased to a negligible value. The approach has been validated by measurements on a prototype operating between 4 and 8 MHz and in which it has been possible to increase the control frequency up to 500 kHz.

A Zero-Transient Dual-Frequency Control for Class-E Resonant DC–DC Converters