Abstract
An efficient synchronous active rectifier and Multi Feedback low drop out (LDO) Regulator coupled with a wireless power receiver (WPR) is proposed in this study. An active rectifier with maximum power conversion efficiency (PCE) of 94.2% is proposed to mitigate the reverse leakage current using zero current sensing. Output voltage and current are regulated by multi-feedback LDO regulator, sharing the single path transistor. The proposed chip is fabricated in the 0.18 μm BCD technology having die area of 16.0 mm2. A 94.2% power conversion efficiency with the load current of 800 mA is measured for the proposed active rectifier.
Highlights
Wireless power transfer (WPT) technology is getting significant attention in recent research, especially with mobile phone chargers
This study proposes an efficient active rectifier and multi-feedback low drop out (LDO) (MF-LDO) regulator coupled with a wireless power receiver
The simplified block diagram of the wireless power receiver is depicted in Figure 1 where the power is transmitted to the receiver through the coil
Summary
Wireless power transfer (WPT) technology is getting significant attention in recent research, especially with mobile phone chargers. The inductive coupling method is one of the popular WPT methods applicable for a distance below. A WPT system has more than 5 W of power at its input, low efficiency of the receiver causes heat which reduces the receiver efficiency [2,3,4,5,6]. The whole efficiency of wireless power receiver (WPR) is controlled by the rectifier [7]. As low-dropout (LDO) regulators get their DC supply from the rectifier, rectifier efficiency is crucial. The output voltage of rectifier determines the LDO regulator’s efficiency. This study proposes an efficient active rectifier and multi-feedback LDO (MF-LDO) regulator coupled with a wireless power receiver.
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