TY - JOUR
T1 - A Q-Modulation Technique for Efficient Inductive Power Transmission
AU - Kiani, Mehdi
AU - Lee, Byunghun
AU - Yeon, Pyungwoo
AU - Ghovanloo, Maysam
N1 - Publisher Copyright:
© 1966-2012 IEEE.
PY - 2015/12
Y1 - 2015/12
N2 - A fully integrated power management ASIC for efficient inductive power transmission has been presented capable of automatic load transformation using a method, called Q-modulation. Q-modulation is an adaptive scheme that offers load matching against a wide range of loading (R{L}) and coupling distance (d{23}) variations in inductive links to maintain high power transfer efficiency (PTE). It is suitable for inductive powering implantable microelectronic devices (IMDs), recharging mobile electronics, and electric vehicles. In Q-modulation, the zero-crossings of the induced current in the receiver (Rx) LC-Tank are detected and a low-loss switch chops the Rx LC-Tank for part of the power carrier cycle to form a high-Q LC-Tank and store the maximum energy, which is then transferred to RL by opening the switch. By adjusting the duty cycle (D), the loaded-Q of the Rx LC-Tank can be dynamically modulated to compensate for variations in RL. A Q-modulation power management (QMPM) prototype chip was fabricated in a 0.35 μm standard CMOS process, occupying 4.8 mm2. In a 1.45 W wireless power transfer setup, using a class-E power amplifier (PA) operating at 2 MHz, the QMPM successfully increased the inductive link PTE and the overall power efficiency by 98.5% and 120.7% at d{23} = 8 cm, respectively, by compensating for 150 Ω variation in RL at D = 45%.
AB - A fully integrated power management ASIC for efficient inductive power transmission has been presented capable of automatic load transformation using a method, called Q-modulation. Q-modulation is an adaptive scheme that offers load matching against a wide range of loading (R{L}) and coupling distance (d{23}) variations in inductive links to maintain high power transfer efficiency (PTE). It is suitable for inductive powering implantable microelectronic devices (IMDs), recharging mobile electronics, and electric vehicles. In Q-modulation, the zero-crossings of the induced current in the receiver (Rx) LC-Tank are detected and a low-loss switch chops the Rx LC-Tank for part of the power carrier cycle to form a high-Q LC-Tank and store the maximum energy, which is then transferred to RL by opening the switch. By adjusting the duty cycle (D), the loaded-Q of the Rx LC-Tank can be dynamically modulated to compensate for variations in RL. A Q-modulation power management (QMPM) prototype chip was fabricated in a 0.35 μm standard CMOS process, occupying 4.8 mm2. In a 1.45 W wireless power transfer setup, using a class-E power amplifier (PA) operating at 2 MHz, the QMPM successfully increased the inductive link PTE and the overall power efficiency by 98.5% and 120.7% at d{23} = 8 cm, respectively, by compensating for 150 Ω variation in RL at D = 45%.
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U2 - 10.1109/JSSC.2015.2453201
DO - 10.1109/JSSC.2015.2453201
M3 - Article
AN - SCOPUS:84960227520
SN - 0018-9200
VL - 50
SP - 2839
EP - 2848
JO - IEEE Journal of Solid-State Circuits
JF - IEEE Journal of Solid-State Circuits
IS - 12
M1 - 7169628
ER -