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Simultaneous power and data transmission is possible by data injection into control signals of power converters without additional hardware. In this paper, a modified analog hysteretic current control is discussed which combines data transmission with efficient quasi-square-wave zero-voltage switching. A half-bridge GaN converter with 99.1 % efficiency is investigated with respect to power conversion efficiency and data transfer. Measurements show that, compared to digital PWM, a wider range of current ripple modulation is available for data transfer before the power efficiency drops. The feasibility of talkative power conversion in the presence of frequency jitter is demonstrated.