一种用于高效感应电力传输的调Q技术。
A Q-Modulation Technique for Efficient Inductive Power Transmission.
作者信息
Kiani Mehdi, Lee Byunghun, Yeon Pyungwoo, Ghovanloo Maysam
机构信息
Electrical Engineering Department at the Pennsylvania State University, University Park, PA 16802, USA.
School of Electrical and Computer Engineering at the Georgia Institute of Technology, Atlanta, GA 30308, USA phone: 814-867-5753.
出版信息
IEEE J Solid-State Circuits. 2015 Dec;50(12):2839-2848. doi: 10.1109/JSSC.2015.2453201. Epub 2015 Nov 26.
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 ( ) and coupling distance ( ) 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 by opening the switch. By adjusting the duty cycle (), the loaded-Q of the Rx LC-tank can be dynamically modulated to compensate for variations in . A Q-modulation power management (QMPM) prototype chip was fabricated in a 0.35-μm standard CMOS process, occupying 4.8 mm. 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 = 8 cm, respectively, by compensating for 150 Ω variation in at = 45%.
一种用于高效感应功率传输的全集成电源管理专用集成电路（ASIC）已被提出，它能够使用一种称为Q调制的方法进行自动负载变换。Q调制是一种自适应方案，可针对感应链路中广泛的负载（ ）和耦合距离（ ）变化提供负载匹配，以保持高功率传输效率（PTE）。它适用于为植入式微电子设备（IMD）供电、为移动电子产品充电以及为电动汽车充电。在Q调制中，检测接收器（Rx）LC振荡电路中感应电流的过零点，一个低损耗开关在功率载波周期的一部分时间内对Rx LC振荡电路进行斩波，以形成一个高Q值的LC振荡电路并存储最大能量，然后通过打开开关将能量传输到 。通过调整占空比（ ），可以动态调制Rx LC振荡电路的负载Q值，以补偿 的变化。一个Q调制电源管理（QMPM）原型芯片采用0.35μm标准CMOS工艺制造，占用面积为4.8平方毫米。在一个1.45W的无线功率传输装置中，使用一个工作在2MHz的E类功率放大器（PA），通过在 = 45%时补偿150Ω的 变化，QMPM在 = 8cm时分别成功将感应链路PTE和整体功率效率提高了98.5%和120.7%。
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