A 6.78-MHz Single-Stage Wireless Power Receiver Using a 3-Mode Reconfigurable Resonant Regulating Rectifier
A 6.78-MHz Single-Stage Wireless Power Receiver Using a 3-Mode Reconfigurable Resonant Regulating Rectifier
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DOI：
10.1109/jssc.2017.2657603
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发表时间：
2017-05-01
影响因子：
5.4
通讯作者：
Tsui, Chi-Ying
中科院分区：
文献类型：
--
作者：
Cheng, Lin;Ki, Wing-Hung;Tsui, Chi-Ying
提出了一种采用三模可重构谐振调节整流器的6.78 mhz无线电力接收机，用于谐振无线电力传输。该接收机仅使用4个片上功率晶体管和1个片外电容，通过在一级内实现功率转换和电压调节，提高了功率转换效率，减少了芯片面积和片外元件。此外，所提出的三模工作减少了输出电压波动，并且在模式切换过程中容易实现切换同步。所提出的脉宽调制控制器采用斜坡叠加技术和ii型补偿，在全负载范围内实现了严密的电压调节，具有快速的瞬态响应。为了进一步提高接收机的轻载效率，还采用了自适应尺寸调整方法。该接收器采用标准的0.35 μ m CMOS工艺，采用5v器件，可将输出电压调节为5v，并提供6w的最大功率。当输出功率为3.5 W时，测量到的峰值效率达到92.2%。负载步长在0.5 ~ 5w之间，过调量和过调量均小于300mv，稳定时间小于16 μ s。
A 6.78-MHz wireless power receiver using a 3-mode reconfigurable resonant regulating rectifier for resonant wireless power transfer is presented. The proposed receiver improves power conversion efficiency and reduces die area and off-chip components by achieving power conversion plus voltage regulation in one stage, using only four on-chip power transistors and one off-chip capacitor. Moreover, the proposed 3-mode operation reduces the output voltage ripples and accomplishes switching synchronization easily during mode switching. The proposed pulsewidth modulation controller using ramp-stacking technique and type-II compensation achieves tight voltage regulation in the full loading range with fast transient responses. An adaptive sizing method is also employed to further improve the light-load efficiency of the receiver. Fabricated in a standard 0.35-mu m CMOS process using 5-V devices, the receiver regulates the output voltage at 5 V and delivers a maximum power of 6 W. The measured peak efficiency reaches 92.2% when delivering an output power of 3.5 W. For a load step between 0.5 and 5 W, the overshoot and undershoot are less than 300 mV and the settling times are less than 16 mu s.