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Class B* - A new high efficiency RF DC/DC converter concept using second harmonic generation/injection

Alt, Alexander ORCID:, Quaglia, Roberto ORCID:, Chen, Peng, Alsahali, Sattam, Tasker, Paul ORCID: and Lees, Jonathan ORCID: 2019. Class B* - A new high efficiency RF DC/DC converter concept using second harmonic generation/injection. Presented at: WPTC 2018: IEEE MTT-S Wireless Power Transfer Conference, Montreal, Quebec, 3-7 June 2018. 2018 IEEE Wireless Power Transfer Conference (WPTC). IEEE, 10.1109/WPT.2018.8639317

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RF DC/DC converters typically treat power amplifier and rectifier separately. This paper presents a novel approach to designing converters based on the interaction between amplifier and rectifier. By utilising the second harmonic power generated in the rectifier to realise second harmonic injection to the power amplifier, both can be operated at high efficiency. This waveform engineering based concept is explored mathematically and then simulated. Based on this analysis, a class B* rectifier based on a 0.25 µm 6x80 µm GaN HEMT is measured using a load-pull/source-pull measurement system to emulate the required harmonic impedance environment. The resulting voltage and current waveforms are de-embedded to the intrinsic current generator plane and analysed, confirming the ability of this kind of rectifier to provide beneficial second harmonic injection to a power amplifier. The rectifier’s efficiency is measured to be more than 90% over an input power range of 20 dB if the generated second harmonic is taken into account.

Item Type: Conference or Workshop Item (Paper)
Date Type: Published Online
Status: Published
Schools: Engineering
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Publisher: IEEE
ISBN: 9781538651605
Related URLs:
Date of First Compliant Deposit: 14 August 2018
Date of Acceptance: 27 March 2018
Last Modified: 05 Jan 2024 08:27

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