This paper presents an active rectifier operating at 40.68 MHz for wirelessly powered biomedical implant devices. The commonly used current-injection-based compensation and delay-based schemes are analyzed. To tackle design difficulties high frequency, a hybrid delay-compensation scheme is proposed to compensate the turn-on turnoff delays. has simple control logic that results in power-efficient comparator design. A fully integrated was fabricated standard 0.18-μm CMOS process with total...

A 6.78 MHz single-stage transmitter (TX) using a reconfigurable regulating class-D power amplifier (PA) for wireless transfer (WPT) applications is presented. Based on 3-mode modulation scheme, the TX achieves regulation and transmission with only one stage. discontinuous-conduction-mode (DCM) zero-voltage switching (ZVS) scheme adopted to reduce loss. control loop set regulate output voltage of WPT receiver (RX) by automatically adjusting transmitting power. With dual-loop...

A 13.56-MHz single-input dual-output (SIDO) wireless power and data transfer (WPDT) system designed for bio-implants is presented. The incorporates a reconfigurable amplifier (RPA) an SIDO rectifier that generates regulated outputs of 1.2 2.5 V different functional blocks bio-implant. dynamic distribution (DPD) scheme employed to adjust the duty ratios based on changing load conditions. WPDT makes use reflected impedances two enable reliable transfer. Implemented in standard 65-nm CMOS...

An ultra-lower-power reconfigurable voltage detector for indoor solar energy harvester is presented. The monitors the cell and sends out a flag signal if surpasses triggering threshold of detector. Instead using traditional dynamic comparator, this design based on power-on-reset (POR) circuit. A POR circuit has ultra-low quiescent loss fixed threshold, which determined by its topology process. Our improvement to use feedback loop that allows be reconfigurable. average 2.774nW. Process...

The design of a thin-film spiral inductor with multi-fin structure on flexible substrate is proposed that can be used in fully integrated wireless power transfer (WPT) system. A solid coil the same dimension and copper thickness but without designed compared. For coil, parasitic resistance reduced from <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$11.6~\Omega $ </tex-math></inline-formula> to...

This paper presents an active rectifier operating at 40.68MHz for wirelessly powered implant devices. To tackle the design difficulties high frequency, a hybrid delay compensation scheme is proposed to compensate turn-on and turn-off delays. Comparing commonly used current-injection-based scheme, this simplifies control logic results in more power efficient comparator design. The fabricated standard 0.18μm CMOS process with total area of 1.581mm <sup...

A detection (tertiary) coil co-planar with the transmitter receives and decodes backscattered data from receiver using load shift keying (LSK). Tertiary parameters such as number of turns, compensation capacitance quality factor are studied for maximizing voltage gain end-to-end efficiency through novel analytical modelling, SPICE simulations measurement results. "inside-tertiary structure" is suggested to save overall area, two variations discussed. Voltage improved by ~197% ~15%,...

This paper presents an energy storage system based on ultra-capacitor to absorbing the regenerating of urban rail transit and releasing when train starts, which can cut down waste. A modular power conversation scheme is proposed accommodate application different electric supply system, with several module connected in series endure high voltage. Multiphase conversion circuit adopted share current, a dual-loop control realize bi-directional flow achieve input voltage equalization modules....

Load shift keying (LSK) is widely used in a wireless power transfer (WPT) system to backscatter secondary side information the primary side. However, when coupling coefficient ( <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">k</i> ) between transmitter and receiver coils lower than critical value <sub xmlns:xlink="http://www.w3.org/1999/xlink">DF</sub> ), demodulated LSK data may flip from "1" "0" or "1," which popularly known as...

A polyimide-based flexible 3-coil inductive power transfer link is proposed to improve the efficiency (PTE) for implantable medical devices (IMDs). An iterative design procedure devised obtain optimal coil geometries of link. example that optimized a 40.68MHz carrier frequency with coupling distance 15mm presented. The results have been verified through simulations and measurements.

Class-D half-bridge power amplifiers (PA) are used to drive the primary coil of a coupled wireless transfer (WPT) system. We analyze inductor current cases such as off-resonant operation, overtuned- and undertuned-capacitor effects due finite rise fall times. also case with Zero Voltage Switching (ZVS) tank. SPICE simulations validate all analytical calculations errors smaller than 2%.

The 'power frequency splitting' phenomenon is widely observed over critical coupling conditions in the wireless power transfer system. Frequency splitting occurs voltage gain and delivered to load (PDL) curve but not end-to-end efficiency curve. This brief has considered mutual inductance model analyze relationship between characteristic frequencies circuit parameters series-parallel Here authors have proposed a novel co-simulation platform using ANSYS MAXWELL SIMPLORER for dynamic modeling...

Galvanically isolated DC-DC converters play a significant role in power delivery under hostile conditions such as industrial automation, electric vehicles, and sensor interfaces, ensuring the safety reliability of devices. A regulation scheme transmitter (either pulse width modulation or hysteretic control) is needed for generating stable DC voltage various load conditions. Pulse (PWM) common Class-E amplifiers (PAs), adopted [1]. However, output Class-D PA cannot be well regulated by...

A fully integrated primary equalizer-assisted constant off-time and hysteretic control reconfigurable transmitter at 13.56 MHz for wireless power transfer (WPT) applications is presented. The can automatically reconfigure to half or full-bridge modes by sensing the operating conditions of secondary side. Measurement results show instant load transient response, increased E2E efficiency, 10% reduced chip area are achieved cost distance range w.r.t. closed-loop control. proposed design...

This brief presents a 600kHz relaxation oscillator with 2.2 μW power consumption. A low frequency-locked loop (FLL) structure is proposed to increase the frequency immunity against voltage, temperature and process (PVT) variations. front-end regulator further enhance voltage stability limited overhead. current-injection scheme compensate variation from on-chip poly-resistors. Fabricated in 0.18 μm technology, this can operate at an unregulated supply 1.1V 3.3V 0.046%/V measured 48.69ppm/°C...

Laser powder bed fusion (LPBF) gives new insights into the effective fabrication of multi-material parts. However, they have not reached mechanical reliability due to undesirable physical defects such as porosity related spatter. The effect a bed-substrate system with on thermo-mechanical behavior parts is still unclear. In this paper, considering spatter, property model titanium alloy/ceramic composites (TCCs) established based mixture method. Considering temperature-dependent thermal...

The mechanical performance of metallic parts fabricated by powder bed fusion (PBF) additive manufacturing is directly linked with process variables. However, it remains challenging to rapidly forecast the resulting based on specified conditions. To tackle this issue, paper proposes a process-performance prediction model capable efficiently estimating yielding strength (YS) and ultimate tensile (UTS) via used parameters. formation quality metals related energy absorptivity/consumption first...

Inductively-coupled wireless powered transfer (WPT) is widely used in implantable medical devices (IMD) [1] to avoid batteries. Flexible coils [2] are desired this application as they can be attached onto or implanted into human body. However, flexible coil bending incoming magnetic shielding material cause mismatch between LC tank's resonant frequency <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$(\mathrm{f}_{\text{LC}})$</tex> and primary...