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PROJECT TITLE :

A Q-Modulation Technique for Efficient Inductive Power Transmission

ABSTRACT:

A absolutely integrated power management ASIC for economical inductive power transmission has been presented capable of automatic load transformation using a methodology, referred to as Q-modulation. Q-modulation is an adaptive theme that provides load matching against a wide selection of loading $(R_L)$ and coupling distance $(d_23)$ variations in inductive links to take care of high power transfer potency (PTE). It is appropriate for inductive powering implantable microelectronic devices (IMDs), recharging mobile electronics, and electric vehicles. In Q-modulation, the zero-crossings of the induced current within the receiver (Rx) LC-tank are detected and an occasional-loss switch chops the Rx LC-tank for part of the power carrier cycle to form a high-Q LC-tank and store the most energy, which is then transferred to $R_L$ by opening the switch. By adjusting the duty cycle $(D)$, the loaded-Q of the Rx LC-tank can be dynamically modulated to atone for variations in $R_L$ . A Q-modulation power management (QMPM) prototype chip was fabricated during a zero.thirty five $mu$m commonplace CMOS method, occupying four.eight mm$^2$ . In a 1.45 W wireless power transfer setup, using a category-E power amplifier (PA) operating at two MHz, the QMPM successfully increased the inductive link PTE and the general power efficiency by 98.fivep.c and one hundred twenty.7% at $d_23 = $ eight cm, respectively, by compensating for 150 $Omega$ variation in $R_L$ at $D = $ forty fivepercent.


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