This paper presents a reconfigurable cross-connected (CC) wireless power transceiver (TRX) operating at 6.78 MHz and implemented for bidirectional device-to-device (D2D) charging with high efficiency small system volume. We propose, the first time, CC topology applied to differential class-D amplifier significant switching loss reduction. Two delay-locked loops (DLLs) each NMOS transistor form controller, realizing adaptive deadtime control in transmitter (TX) mode off-delay compensation...

This article presents a hybrid single-inductor bipolar-output (SIBO) dc-dc converter for active-matrix organic light-emitting diode (AMOLED) displays, which are relatively more sensitive to the supply noise on positive supply. First, improve display quality we adopt floating negative output configuration migrate all switching ripples into output, achieving near-zero voltage ripple output. Second, design low-power shunt regulators, only deal with small portion of ripple, regulate further,...

Tiny implantable medical devices in millimeter size demand advanced wireless power solutions that operate at hundreds of megahertz and mainly use passive rectifiers for ac-dc conversion. A conventional cross-connected (CC) rectifier can with high frequency low input voltage but only achieves good efficiencies a very narrow range, due to the shoot-through reverse currents. This work presents CMOS active bias tuning (ABT), allowing widely extended range conversion efficiency (PCE). In...

Wireless power transfer (WPT) via inductive coupling is a convenient way to charge power-starved portable/wearable devices. Recently, device-to-device (D2D) wireless charging was demonstrated [1,2], which expands the range of WPT applications. Different from traditional charging, obtains its energy AC mains and has virtually unlimited energy, D2D sources an energy-constrained battery. Therefore, achieving maximum-efficiency key design issue. A zero-voltage-switching (ZVS) Classy receiver...

This article proposes a reconfigurable single-stage regulating asymmetrical full-wave step-down rectifier (SDR) for fast wireless charging. The SDR is into step-up power amplifier (SUPA) device-to-device (D2D) and SUPA can have direct connection with the battery without an additional voltage regulator module (VRM). With structure, transmitting (TX) receiving (RX) ac voltages across resonant coil be boosted, which greatly reduces currents losses, improving D2D charging power. A controller...

This paper presents a hybrid single-inductor bipolar triple-output (SIBTO) DC-DC converter for active-matrix organic light-emitting diode (AMOLED) displays. Generating the rails <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$V_{\mathrm {OP}}$ </tex-math></inline-formula> and {ON}}$ pixel array analog rail AVDD source driver with single inductor greatly reduces system size cost. work adopts floating...

This paper presents a single-stage wireless charger using current-mode active rectifier with accurate output current regulation for efficient charging. As we know, the processes an AC input voltage/current and pulsing which are difficult to be accurately sensed on chip small area power overheads. The proposed sensing technique uses replica stage in parallel main stage. It consists of two cross-connected PMOS transistors, filtering capacitor, dynamic load. In addition, by adaptively tuning...

This paper presents a hybrid single-inductor bipolar-output (SIBO) DC-DC converter for active-matrix organic light-emitting diode (AMOLED) displays which are relatively more sensitive to the supply noises on their positive supply. design significantly improves display quality by achieving near-zero voltage ripple at output thanks negative floating and use of low-power shunt regulators. In addition, with topology proposed cross-coupled bootstrap-based level-shifter dual-PMOS inverter buffer,...

This paper presents a fully integrated 6.78 MHz active voltage doubler with near-optimal on/off delay compensation scheme, achieving the maximized AC to DC power conversion efficiency (PCE) and ratio (VCR) for implantable medical devices (IMDs). In proposed design, we build sampling-based feedback loops real-time diode compensation. The was designed standard CMOS 0.35 Mm process. It achieves peak PCE of 92.2% 500 Ω load, VCR 1.92 2 kfí improved by 10% 33%, respectively, when compared without...

Portable power banks with wireless charging are popular on the market, targeting a to-go experience. However, low input voltage from battery and large equivalent series resistance (ESR) of coupling coils limit efficiency device-to-device (D2D) charging, making it difficult to achieve high simultaneously [1]. The winding loss is one major due ESR hundreds $\mathrm{m}\Omega$ [1–4]. Moreover, thicker wire or multi-strand Litz at 6.78MHz cannot effectively reduce skin proximity effects....

Inductive link intended to deliver energy implantable devices is recently becoming a popular method. To improve efficiency, the compensated capacitors are adopted resonate at same frequency with power transfer on both sides. However, there limited research efficiency and output concerning quality factors, selection between serial-parallel (SP) serial-serial (SS) topologies, as well coil design. This study delves into of SP SS topologies using rigorous mathematical derivations reflected...

This paper presents a single-stage regulated active rectifier with two operation modes of constant-current charging mode (CC) and constant-voltage (CV) for battery wireless charging. With the delay-tuned rectifier, proposed charger can realize AC-DC power rectification, voltage regulation, CC CV in single stage high efficiency small volume. The adaptive tuning delay NMOS gate-drive signals, regulates average current at constant value mode, output mode. circuit achieves precise AC sensing...

This article presented a wireless power receiver (RX) with split-dual-path and merged switched-capacitor-inductor hybrid-quad-path (S2H4) step-down rectifying conversion for high output current. It can obtain the <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$V_{\mathrm {ac}}$ </tex-math></inline-formula> amplitude as notation="LaTeX">$3V_{\mathrm {OUT}}$ , which increases of resonant tank. With multiple...

A high efficiency wireless power transfer system that operates in the very frequency (VHF) band is desirable for miniaturized implantable medical devices (IMD), but also challenging. This work presents an integrated VHF passive rectifier with closed-loop active bias tuning (ABT). Power PMOS and NMOS transistors are separately cross-connected, such DC voltages of gates can be dynamically adjusted. We employed a search scheme V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...

High power density wireless fast charging is an attractive feature for mobile devices. In this paper, we propose a receiver (RX) with rectification through split-dual-path and step-down conversion obtained merged switched-capacitor-inductor hybrid-quad-path (S2H4). such architecture, in the LC tank (rivers' source) currents separate into multiple paths (rivers) finally all flow battery (the sea).

This paper introduces a new application of wireless power transfer, enabled by our reconfigurable bi-directional transceiver chips. Here, two transceivers, which reuse almost all the hardware, are briefly discussed. In particular, novel cross-connected structure for differential class-D amplifier in transmitter mode is proposed reducing switching losses. Fabricated 0.35 μm CMOS process with 5V devices, over 78% battery-to-battery charging total efficiency and 0.6A current demonstrated...