Gougheri Hesam Sadeghi, Kiani Mehdi
Electrical Engineering Department at the Pennsylvania State University, University Park, PA 16802, USA.
IEEE J Solid-State Circuits. 2019 Mar;54(3):847-884. doi: 10.1109/JSSC.2018.2884322. Epub 2018 Dec 18.
An integrated power management (IPM) with the unique capabilities of seamless-voltage/current-mode (SVCM) operation and energy recycling is presented for robust inductive power delivery. Utilizing parasitic bulk diodes with lower voltage drop, this IPM seamlessly transitions between voltage mode (VM) and current mode (CM) in a safe and robust fashion, extending the input-voltage range (removing dead zone) and significantly improving power-conversion efficiency (PCE) in CM operation. The IPM first provides the required load power (P) by one-step rectification/regulation, and then stores the surplus energy into a storage capacitor to extend the receiver (Rx) operation time via energy recycling when the input power is insufficient. The theory behind the energy recycling is presented. A proof-of-concept chip was fabricated in a 0.35 µm CMOS process. In measurements, the chip safely achieved a regulated voltage of 3 V for a wide input-voltage range (without dead zone) by switching the Rx LC-tank at 142 kHz. With zero input power, the chip extended the Rx operation time by 250% thanks to the energy recycling.
本文提出了一种集成电源管理（IPM），其具有无缝电压/电流模式（SVCM）操作和能量回收的独特功能，用于稳健的感应功率传输。利用具有较低压降的寄生体二极管，该IPM以安全稳健的方式在电压模式（VM）和电流模式（CM）之间无缝转换，扩展了输入电压范围（消除死区），并显著提高了CM操作中的功率转换效率（PCE）。IPM首先通过一步整流/调节提供所需的负载功率（P），然后在输入功率不足时将多余的能量存储到储能电容器中，通过能量回收来延长接收器（Rx）的操作时间。文中介绍了能量回收背后的理论。采用0.35μm CMOS工艺制造了一个概念验证芯片。在测量中，该芯片通过在142kHz下切换Rx LC谐振槽，在宽输入电压范围（无死区）内安全地实现了3V的稳压。由于能量回收，在零输入功率的情况下，该芯片将Rx的操作时间延长了250%。
