This paper describes a dual-output, reconfigurable integrated power management (IPM) ASIC for inductive power delivery. The proposed ASIC operates either as a current-mode (CM) rectifier or a boost converter by sharing the receiver (Rx) coil (LRx) to improve performance of inductive power transmission against the variations of Rx input power (PRx) and dual-output DC power (PL+ PHv). Conventional IPM structures either fail to generate regulated outputs (e.g., VL and VHv when the required PL+ PHv exceeds PRx or suffer from low power-conversion efficiency (PCE) when PRx exceeds PL+ PHv due to voltage regulation and protection. To overcome these challenges, the proposed ASIC offers the unique capabilities of 1) generating multiple regulated outputs (VL= 2.6 V, VHv= 3.9 V) directly from LRx with single-stage conversion, 2) efficient CM operation with active rectification, enabled by adaptive switching control (ASC), 3) charging a large capacitor (CS) with the purpose of operating as a shared-inductor boost converter (SBC), transferring energy from CS to CL and CHv, when PRx< PL+ PHv, and 4) efficient voltage-power regulation (VPR). A proof-of-concept chip was fabricated in a 0.35-μm 2P4M standard CMOS process occupying 1.35-mm2 active area. In measurements, the proposed ASIC was able to successfully provide regulated VL= 2.6 V and VHv= 3.9 V despite significant variations in PRx, PL, and PHv. Moreover, the chip extended the peak output power range by 750% and improved the PCE by 1.3 times and 8.1 times thanks to the ASC and VPR, respectively.
|Original language||English (US)|
|Number of pages||12|
|Journal||IEEE transactions on biomedical circuits and systems|
|State||Published - Oct 2019|
All Science Journal Classification (ASJC) codes
- Biomedical Engineering
- Electrical and Electronic Engineering