A 0.18-$ \mu{\hbox {m}}$ Monolithic Li-Ion Battery Charger for Wireless Devices Based on Partial Current Sensing and Adaptive Reference Voltage

Pagano, R.; Baker, Mike; Radke, R. E.

doi:10.1109/jssc.2012.2191025

Cited by 51 publications

(29 citation statements)

References 12 publications

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“…The state-of-the-art rectifier's efficiency is around 89% max. The switching converter's efficiency can reach 86% [12]. The combination of these two stages makes the overall maximum efficiency (from the coil to the battery) down to 64%.…”

Section: Implementation and Test Resultsmentioning

confidence: 99%

High-efficiency high-current drive power converter IC for wearable medical devices

Chu

Artan

Czarkowski

et al. 2015

IEICE Electron. Express

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Nowadays multi-functional wearable devices generally require high current drive capability because microcontrollers (MCU) or rechargeable batteries are embedded inside. To achieve both high current and high power efficiency, this article presents a switched-inductor-based AC-DC buck converter that is implemented on a 0.18 µm chip manufacturing process for transcutaneously powered wearable devices. Different from multi-stage AC-DC converters that were widely used for wearable devices, the presented single-stage circuit has concise structure but provides flexible voltage output, high efficiency, and high current drive capability. The maximum output current can go up to 250 mA, and the peak efficiency is measured as 80.1% for 100 mA load current. The chip size is 185 µm × 260 µm.

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Section: Implementation and Test Resultsmentioning

confidence: 99%

High-efficiency high-current drive power converter IC for wearable medical devices

Chu

Artan

Czarkowski

et al. 2015

IEICE Electron. Express

View full text Add to dashboard Cite

show abstract

“…According to Equation (10), when f sw = f res /n, the nth subharmonic component can be used for the power transmission. Considering that the DC and other components are filtered out by the TX resonant tank, V refl can be written as:…”

Section: Switching Frequency Modulationmentioning

confidence: 99%

“…For instance, the power supply should be regulated to >10 V for the neural stimulators in implantable medical devices (IMDs) [8] or flash memory circuits [9]. For battery charging, a constant current and voltage control is required [10]. Also, the regulation becomes especially important in an R-WPT system considering load and coupling distance variation and a coil misalignment [11].…”

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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“…The battery charger circuit plays a significant role in battery management, to ensure safe and reliable charging and, thus, prolonging the battery life expectancy. Earlier works [31][32][33][34][35][36] show various control schemes based on digital and analog techniques. In [34,35], LDO-based Li−ion battery chargers are reported.…”

Section: Battery Charger Circuitmentioning

confidence: 99%

“…In [34,35], LDO-based Li−ion battery chargers are reported. These chargers' ICs provide good stability performance, but are characterized by their low efficiency at the start of the charging process [31]. To compensate for the low efficiency, switched mode converter-based chargers are proposed in [31,32].…”

Section: Battery Charger Circuitmentioning

confidence: 99%

An Integrated Chip High-Voltage Power Receiver for Wireless Biomedical Implants

Nair

Choi

2015

Energies

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In near-field wireless-powered biomedical implants, the receiver voltage largely overrides the compliance of low-voltage power receiver systems. To limit the induced voltage, generally, low-voltage topologies utilize limiter circuits, voltage clippers or shunt regulators, which are power-inefficient methods. In order to overcome the voltage limitation and improve power efficiency, we propose an integrated chip high-voltage power receiver based on the step down approach. The topology accommodates voltages as high as 30 V and comprises a high-voltage semi-active rectifier, a voltage reference generator and a series regulator. Further, a battery management circuit that enables safe and reliable implant battery charging based on analog control is proposed and realized. The power receiver is fabricated in 0.35-µm high-voltage Bipolar-CMOS-DMOStechnology based on the LOCOS0.35-µm CMOS process. Measurement results indicate 83.5% power conversion efficiency for a rectifier at 2.1 mA load current. The low drop-out regulator based on the current buffer compensation and buffer impedance attenuation scheme operates with low quiescent current, reduces the power consumption and provides good stability. The topology also provides good power supply rejection, which is adequate for the design application. Measurement results indicate regulator output of 4 ± 0.03 V for input from 5 to 30 V and 10 ± 0.05 V output for input from 11 to 30 V with load current 0.01-100 mA. The charger circuit manages the charging of the Li-ion battery through all if the typical stages of the Li-ion battery charging profile.

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A 0.18-$ \mu{\hbox {m}}$ Monolithic Li-Ion Battery Charger for Wireless Devices Based on Partial Current Sensing and Adaptive Reference Voltage

Cited by 51 publications

References 12 publications

High-efficiency high-current drive power converter IC for wearable medical devices

High-efficiency high-current drive power converter IC for wearable medical devices

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

An Integrated Chip High-Voltage Power Receiver for Wireless Biomedical Implants

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