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A Self-tuning resonant-inductive-link transmit driver using quadrature symmetric phase switched fractional capacitance

A Self-tuning resonant-inductive-link transmit driver using quadrature symmetric phase switched fractional capacitance
A Self-tuning resonant-inductive-link transmit driver using quadrature symmetric phase switched fractional capacitance
Inductive coupling for power transfer is increasingly popular in many applications such as RFID and wireless charging. While much recent work has focussed on receivers, less consideration has been given to the transmit function. High-Q antenna circuits are beneficial for several reasons. Activation of a link at a distance requires a large magnetic field from the transmitter, so for a given antenna current, lower driver voltages may be used, simplifying the driver and its power supplies, and improving overall efficiency. Further, the inherent filtering allows a high-efficiency switching driver to be used while reducing harmonics in the current. However, the consequent narrow bandwidth requires precise tuning to resonance. The excitation frequency may be varied in some applications, but this transfers the tuning problem to the receiver. Any transmit tuning circuitry must be linear with large voltages (from a few V to kV) and currents (mA to many A). A conventional technique is to use multiple external capacitors selected by large switches or even relays. The number of selectable elements needed depends on the Q factor, component tolerances, and environmental effects, with a typical system requiring 5 or more extra capacitors and associated HV switches (Fig. 22.1.1), plus extra IC pins, adding to system cost and volume.
Redman-White, William
d5376167-c925-460f-8e9c-13bffda8e0bf
Kennedy, Henry
c5126d0a-7d40-4c1b-95fd-412700da946f
Bodnar, Rares
37f4be97-985b-401d-bd9a-a4d3caf007e9
Redman-White, William
d5376167-c925-460f-8e9c-13bffda8e0bf
Kennedy, Henry
c5126d0a-7d40-4c1b-95fd-412700da946f
Bodnar, Rares
37f4be97-985b-401d-bd9a-a4d3caf007e9

Redman-White, William, Kennedy, Henry and Bodnar, Rares (2017) A Self-tuning resonant-inductive-link transmit driver using quadrature symmetric phase switched fractional capacitance. International Solid-State Circuits Conference (ISSCC 2017), San Francisco, United States. 05 - 09 Feb 2017. (doi:10.1109/ISSCC.2017.7870415).

Record type: Conference or Workshop Item (Paper)

Abstract

Inductive coupling for power transfer is increasingly popular in many applications such as RFID and wireless charging. While much recent work has focussed on receivers, less consideration has been given to the transmit function. High-Q antenna circuits are beneficial for several reasons. Activation of a link at a distance requires a large magnetic field from the transmitter, so for a given antenna current, lower driver voltages may be used, simplifying the driver and its power supplies, and improving overall efficiency. Further, the inherent filtering allows a high-efficiency switching driver to be used while reducing harmonics in the current. However, the consequent narrow bandwidth requires precise tuning to resonance. The excitation frequency may be varied in some applications, but this transfers the tuning problem to the receiver. Any transmit tuning circuitry must be linear with large voltages (from a few V to kV) and currents (mA to many A). A conventional technique is to use multiple external capacitors selected by large switches or even relays. The number of selectable elements needed depends on the Q factor, component tolerances, and environmental effects, with a typical system requiring 5 or more extra capacitors and associated HV switches (Fig. 22.1.1), plus extra IC pins, adding to system cost and volume.

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A Self-Tuning Resonant Inductive Link Transmit Driver - Accepted Manuscript
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More information

e-pub ahead of print date: 6 March 2017
Published date: 6 March 2017
Venue - Dates: International Solid-State Circuits Conference (ISSCC 2017), San Francisco, United States, 2017-02-05 - 2017-02-09
Organisations: Electronics & Computer Science, EEE

Identifiers

Local EPrints ID: 411696
URI: http://eprints.soton.ac.uk/id/eprint/411696
PURE UUID: 443f0509-86c3-4945-96f2-573873256289

Catalogue record

Date deposited: 22 Jun 2017 16:31
Last modified: 02 Nov 2023 00:41

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Contributors

Author: William Redman-White
Author: Henry Kennedy
Author: Rares Bodnar

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