Load-Independent Push–Pull Class E$ ^2$ Topology With Coupled Inductors for MHz-WPT Applications

Abstract

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Comprehensive Design Approach to Switch-Mode Resonant Power Amplifiers Exploiting Geodesic-to-Geodesic Impedance Conversion

“…When 𝑅 ℓ deviates from its nominal resistance, the ZVS operation fails because the optimum values for 𝐶 s and 𝐿 depend on 𝑅 ℓ . To address this issue, a previous research replaced the input choke coil with a finite inductor [20][21][22][23][24][25][26]. This technique substantially improves the load tolerance.…”

“…This result signifies that the amplifier's RF output current stays constant even when the load resistance changes. Tables 1 and 2 comprehensively cover circuit topologies in addition to all the previous works [20][21][22][23][24][25][26]. The class-G2G amplifier is a general concept intended to unify the variety of possible circuit topologies.…”

“…Unless the load is exactly adjusted to the nominal resistance, the amplifier goes off from the ZVS condition and the efficiency substantially degrades [15][16][17]. In attempts to mitigate the effect of load resistance deviation, several reports have been made on class-E power amplifiers and inverters [20][21][22][23][24][25][26]. They are effective but the question still remains if there is any better solution to the load deviation problem or not.…”

Misalignment tolerance improvement and high efficiency design for wireless power transfer system based on DDQ‐DD coil

“…In contrast to conventional WPT systems, the proposed system employs two push-pull Class E inverters on the Tx side to control the DD coil and Q coil independently, thus improving the system's power transmission efficiency compared to H bridge inverters. 26,27 Considering the misalignment tolerance improvement requirement, the series-series (S-S) topology is chosen as the compensation network because of the easy parameter design, and the resonant capacitor is independent of coupling conditions. 28 For this WPT system, the power is transferred via two paths.…”

Optimization of a 6.78-MHz Inductive Power Transfer System for Unmanned Aerial Vehicles

“…2, was implemented. In addition, interleaving two class-E converters in 180-degree phase-shift can suppress the odd-order harmonic through the DC source [26], [27]. Prior research in [27]- [29] indicates that satisfying the parameters of the components, as specified in (1), is essential for load-independent operation, constant voltage gain, and zero-voltage-switching (ZVS) across the entire load.…”