Browsing by Author "Chen, Shao-Qi"

Now showing 1 - 5 of 5

A High Efficiency and Fast Transient Digital Low-Dropout Assisted Switched-Capacitor Converter for EMI-Free Internet of Everything (IoE) Systems
(2017-01-01)
Chen, Shao-Qi
;
Lin, Yen-Ting
;
Ma, Yu-Sheng
;
Yang, Wen-Hau
;
Chen, Ke-Horng
State-of-the-art closed-loop switched-capacitor (SC) designs usually regulate the output voltage by pulse frequency modulation (PFM) with the disadvantage of large electromagnetic interference (EMI). It may cause the failure of the Internet of Everything (IoE) devices. This paper proposes the hybrid digital low drop-out (DLDO) SC converter with a constant switching pulse width modulation (PWM) control for low EMI. Besides, the analog-to-digital current conversion provided by the DLDO due to its fast transient response can predict the desired ratio for the SC and reduce the dip voltage at the same time. The handshaking technique achieves smooth transition in the hybrid architecture. Experimental results show peak efficiency of 85% (closed-loop) and 95% (open loop) since the power converter has fast transient response by the DLDO prediction and reduction of switching power loss. Accurate fine tune operation by the DLDO and smooth handshaking improve load regulation from 49mV to 3mV and undershoot from 263mV to 93mV with a reduced recovery time of 200ns.
A Pseudo-Ramp Controlled Three Level Buck Converter with an Auto-ripple Cancellation Technique for Low Output Voltage Ripple in Sub-threshold Applications
(2018-01-01)
Chu, Li-Cheng
;
Chen, Shao-Qi
;
Chen, Ke-Horng
;
Lin, Ying-Hsi
;
Lin, Shian-Ru
In high switching frequency and low duty conversion, the on-time in duty cycle is restrained to brief period. The three-level converter extends the on-time to two times larger. By Pseudo-Ramp Controller (PRC) and Auto-Ripple Cancellation (ARC) Topology, flying capacitors are balanced to 50% input voltage with the accuracy of duty cycle improves 11 times and 3mV output voltage ripple.
A Single-Inductor Triple-Output Converter with an Automatic Detection of DC or AC Energy Harvesting Source for Supplying 93% Efficiency and 0.05mV/mA Cross Regulation to Wearable Electronics
(2019-01-01)
Nagateja, T.
;
Chen, Shao-Qi
;
Chu, Li-Cheng
;
Chen, Ke-Horng
;
Lin, Ying-Hsi
the proposed single-inductor triple-output (SITO) converter can accept both DC battery voltage and AC energy harvesting voltage to provide a triple step up and down outputs. Storing the energy to the H-bridge capacitor first and pumping it later can ensure a continuous inductor current for reducing the output voltage ripple by 67%. Due to the H-bridge, the inductor current value is reduced to 1/5X to achieve high efficiency of 93% under the current loading of 120mA. Moreover, the proposed PWM and the adaptive on-time hybrid controller uses different modulation methods in a single controller to meet the requirements of different multiple outputs.
An Enhanced-Security Buck DC-DC Converter with True-Random-Number-Based Pseudo Hysteresis Controller for Internet-of-Everything (IoE) Devices
(2018-01-01)
Yang, Wen-Hau
;
Chu, Li-Cheng
;
Yang, Shang-Hsien
;
Lai, Yan-Jiun
;
Chen, Shao-Qi
An Enhanced-Security Buck DC-DC Converter with True-Random-Number-Based Pseudo Hysteresis Controller for Internet-of-Everything (IoE) Devices
(2018-01-01)
Yang, Wen-Hau
;
Chu, Li-Cheng
;
Yang, Shang-Hsien
;
Lai, Yan-Jiun
;
Chen, Shao-Qi