A High-Efficiency 6.78-MHz Full Active Rectifier With Adaptive Time Delay Control for Wireless Power Transmission

1. A High-Efficiency 6.78-MHz Full Active Rectifier with
Adaptive Time Delay Control for Wireless Power
Transmission
ABSTRACT:
This paper presents a full active rectifier consisting of GaN devices and a CMOS
controller designed for wireless power transmission in high-power consumer
devices. An adaptive time delay control circuit is developed to maximize the
conduction interval of the GaN switch, which can significantly reduce the power
loss caused by the forward voltage imposed by the diode. The proposed control
algorithm also eliminates the reverse leakage current of the rectifier, and thus
further improves its power transfer efficiency. The controller implemented based
on a high voltage 0.18-µm CMOS process and the power stage consisting of four
GaN transistors are assembled on the same printed circuit board (PCB) board. The
proposed rectifier provides a maximum output current of 3 A at 5 V, with a 6.78-
MHz ac input voltage. Its peak power transfer efficiency is 91.8%. The proposed
architecture of this paper analysis the logic size, area and power consumption using
Tanner tool.

2. SOFTWARE IMPLEMENTATION:
 Tanner tool