A Triple-Mode Wireless Power-Receiving Unit With 85.5% System Efficiency for A4WP, WPC, and PMA Applications

Park, Young-Jun; Jang, Byeong-Gi; Park, Seong-Mun; Ryu, Ho-Cheol; Oh, Seong Jin; Kim, Sang-Yun; Pu, YoungGun; Yang, Youngoo; Lee, Minjae; Lee, Kang-Yoon

doi:10.1109/tpel.2017.2703153

Cited by 32 publications

(15 citation statements)

References 16 publications

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“…The examples from [8,17] are active rectifiers for A4WP standard operating at 6.78 MHz and their efficiencies are 91.5% and 94.2% respectively. The maximum efficiency of [18] is 92.7% when the input frequency is 150 kHz. Therefore, this work achieves an efficiency of 92.4% and has the best performance when the input frequency is 150 kHz.…”

Section: Resultsmentioning

confidence: 98%

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Design of Peak Efficiency of 85.3% WPC/PMA Wireless Power Receiver Using Synchronous Active Rectifier and Multi Feedback Low-Dropout Regulator

Khan

Park

et al. 2018

Energies

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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 mm 2 . A 94.2% power conversion efficiency with the load current of 800 mA is measured for the proposed active rectifier.

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Section: Resultsmentioning

confidence: 98%

“…This work shows the highest overall efficiency of a rectifier compared with references. The performance comparison with prior works is shown in Table 1 [8,17,18]. The examples from [8,17] are active rectifiers for A4WP standard operating at 6.78 MHz and their efficiencies are 91.5% and 94.2% respectively.…”

Section: Resultsmentioning

confidence: 99%

Design of Peak Efficiency of 85.3% WPC/PMA Wireless Power Receiver Using Synchronous Active Rectifier and Multi Feedback Low-Dropout Regulator

Khan

Park

et al. 2018

Energies

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“…This scheme adopts a rectifier cascaded by a regulating stage as shown in Figure 4. Both the LDO [12][13][14][15] and the DC-DC converter [16][17][18][19][20] can be implemented as the cascaded stage. These schemes are discussed as follows.…”

Section: Post-stage Regulationmentioning

confidence: 99%

“…Therefore, the regulation schemes investigated in the previous works can also be categorized into two types: RX and TX regulation. As illustrated in Figure 3, RX regulation includes post-stage regulation (achieved by a cascading low dropout regulator (LDO [12][13][14][15] or a DC-DC converter [16][17][18][19][20]) and one-stage regulation, including active diode conduction time control [21][22][23], reconfigurable regulating rectification [24][25][26][27], and switching-based current-mode regulation [28][29][30][31]. On the other hand, TX regulation can be achieved by PA supply voltage control [32,33], resonant frequency control [34], PA power switch duty cycle control [35][36][37][38][39][40], and vector power summing control [41,42].…”

Section: Introductionmentioning

confidence: 99%

An Overview of Regulation Topologies in Resonant Wireless Power Transfer Systems for Consumer Electronics or Bio-Implants

Liu

Huang

et al. 2018

Energies

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Abstract:Owing to its relatively high efficiency, extended transmission range, and less exposure to radio frequency radiation, near-field resonant wireless power transfer (R-WPT) has been widely used in consumer electronics and bio-implants. For most applications, a well-regulated output voltage is required against the coupling and loading variations, and thus a regulation scheme should be employed in an R-WPT system. To achieve an optimal receiver (RX) or overall efficiency, together with a reduced cost overhead, several regulation schemes have been proposed in recent years, where the regulation can be implemented at either the RX or transmitter (TX) side, or both. These regulation schemes have been reviewed and comprehensively discussed in this paper. Hence, the main contribution of this paper is to provide a guideline for designing the regulation scheme in R-WPT systems. Moreover, potential new topologies of regulation are investigated here.

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“…Products supporting AirFuel Resonant technology use an additional DC converter to supply stable output voltage [8][9][10]. Therefore, reports establishing MR-WPT systems use an additional DC converter to achieve a constant output voltage [11][12][13][14][15]. An extra stage of circuits degrades the total power efficiency.…”

Section: Introductionmentioning

confidence: 99%

Bootstrap capacitorless DCM VOT buck converter with dead‐time‐based off‐time calibration for magnetic resonance wireless power transfer

Namgoong

Choi

et al. 2020

IET Power Electronics

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This study reports a miniaturised discontinuous conduction mode (DCM) variable on-time (VOT) buck converter providing an output of 1.8 V in the input range of 3-12 V to support applications with large wireless coupling. Conventionally, an additional large capacitor has been used as a bootstrap capacitor to drive the high-side switch of buck converters, which prevents minimisation. In this study, a standalone momentary power consumption level shifter is proposed to remove the additional bootstrap capacitor and increase the power conversion efficiency (PCE) in the buck converter. A Zener diode is utilised to reduce the power consumption of the level shifter. In addition, a dead-time-based off-time calibration circuit is proposed to further increase the PCE by reducing the low-side conduction loss. The proposed circuit is fabricated with a TSMC 0.18-µm BCD process, and the core circuit occupies an active area of 0.68 mm 2 with two external components. It provides output currents in the range of 20 µA to 3 mA with a maximum switching frequency of 750 kHz. The maximum efficiency of the converter below 5 mW is 80.2%.

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A Triple-Mode Wireless Power-Receiving Unit With 85.5% System Efficiency for A4WP, WPC, and PMA Applications

Cited by 32 publications

References 16 publications

Design of Peak Efficiency of 85.3% WPC/PMA Wireless Power Receiver Using Synchronous Active Rectifier and Multi Feedback Low-Dropout Regulator

Design of Peak Efficiency of 85.3% WPC/PMA Wireless Power Receiver Using Synchronous Active Rectifier and Multi Feedback Low-Dropout Regulator

An Overview of Regulation Topologies in Resonant Wireless Power Transfer Systems for Consumer Electronics or Bio-Implants

Bootstrap capacitorless DCM VOT buck converter with dead‐time‐based off‐time calibration for magnetic resonance wireless power transfer

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