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公开(公告)号：US20250044328A1
公开(公告)日：2025-02-06
申请号：US18745692
申请日：2024-06-17
Inventor： Chul KIM , Yechan PARK , Jaeouk CHO , Hongkyun KIM , Seong Jae MOON
IPC: G01R19/17 , G01R19/175 , G01R19/25
Abstract: A zero current detection device is proposed. The device may include a scaling circuit unit configured to generate a first voltage which is scaled from a target voltage. The device may also include a mirroring circuit unit configured to generate a mirroring current when the first voltage is higher than or equal to a reference voltage. The device may further include a comparator circuit unit configured to compare the target voltage and a ground voltage when the mirroring current is input.
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公开(公告)号：US20240405672A1
公开(公告)日：2024-12-05
申请号：US18729077
申请日：2021-12-22
Inventor： Min Kyu JE , Dong Hee CHO , Chul KIM
Abstract: A load driving device includes a step-up converter for raising a voltage provided by a power supply and supplying same to a load unit, by comprising a first driving unit and a second driving unit, the first driving unit comprising an inductor and a first fly capacitor, and charging energy provided by the power supply, as the inductor and the first fly capacitor are connected in parallel in a first phase, and discharging the charged energy, as the inductor and the capacitor are connected in series in a second phase, and the second driving unit comprising a second fly capacitor for charging energy provided by the power supply in the second phase and discharging the energy charged in the second phase; and a current control unit for controlling a current provided to the load unit by detecting the current flowing in the load unit and controlling the step-up converter.
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公开(公告)号：US20230261525A1
公开(公告)日：2023-08-17
申请号：US17673164
申请日：2022-02-16
Inventor： Minkyu JE , Yechan PARK , Chul KIM , Seok-Tae KOH , Jeongeun LEE , Hongkyun KIM , Jaesuk CHOI
CPC classification number: H02J50/27 , H02J50/23 , H04B5/0037 , H04B5/0031
Abstract: A power and data receiver according to the present embodiment includes: a reception coil configured to receive a power data signal from a transmission coil; a power unit forming driving power from the power data signal; and a data demodulation unit configured to demodulate a data signal from the power data signal, wherein the reception coil operates adjacent to the transmission coil to the extent that a first resonant frequency and a second resonant frequency are formed between the reception coil and the transmission coil, and the reception coil operates at a frequency greater than or equal to the first resonant frequency and smaller than or equal to the second resonant frequency in relation to the transmission coil.
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公开(公告)号：US20230172558A1
公开(公告)日：2023-06-08
申请号：US17707722
申请日：2022-03-29
Inventor： Chul KIM , Sanghyun LEE
CPC classification number: A61B5/7214 , A61B5/02416 , A61B5/7225
Abstract: Various embodiments provide a computer device for attenuating motion artifacts in photoplethysmography (PPG) in real time and a method using the same. The computer device obtains a primarily restored PPG AC signal from a distorted PPG signal by using an exponentially weighted moving average filter and restores the final PPG AC signal from the primarily restored PPG AC signal through block interleaving. The computer device includes an initial unit obtaining a basic period of a PPG signal from a PPG sensor in an initial state, an update unit obtaining a waveform and period of a PPG signal not having distortion from the PPG sensor in the state in which motion artifacts are not present, a compensation unit detecting the final PPG AC signal by restoring a waveform of the distorted PPG signal, and a command unit outputting the final PPG AC signal.
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