Improvement of Multilevel DC/DC Converter for E-Mobility Charging Station

Considerable efforts are being made to reduce CO2 emissions and thereby solve the problems of environmental pollution and global warming. Technologies for environmentally friendly transportation are being developed using batteries. In particular, with the increase in urbanization and one-person households, e-mobility products are drawing increasing attention as short-distance transportation devices. Among these vehicles, personal mobility devices (PMDs) are receiving attention as new transportation devices that are simple to operate. This paper proposes a new multilevel charging system that is advantageous in responding to the charging voltage specifications of various mobile devices with a single charging system while ensuring a low charging current ripple. The proposed diode-parallel multilevel converter consists of an independent Buck converter in series. The switch of the buck converter is configured at the negative terminal of the input power source so that the gate amplifier voltage is used as the power supply voltage; it can therefore be simply configured without a separate gate amplifier power supply. In addition, it is improved so as to have a wider charging voltage range in a low output voltage region and a better efficiency than the existing diode series multilevel converter. To verify the feasibility of the proposed system, simulations were performed using the software PowerSIM(PSIM), and, in order to verify the validity, a prototype charging system was fabricated to compare and analyze losses according to operating conditions.

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3D stacked buck converter with 15μm thick spiral inductor on silicon interposer for fine-grain power-supply voltage control in SiP's

2010 IEEE International 3D Systems Integration Conference (3DIC) ◽

10.1109/3dic.2010.5751437 ◽

2010 ◽

Cited By ~ 9

Author(s):

Koichi Ishida ◽

Koichi Takemura ◽

Kazuhiro Baba ◽

Makoto Takamiya ◽

Takayasu Sakurai

Keyword(s):

Power Supply ◽

Supply Voltage ◽

Voltage Control ◽

Buck Converter ◽

Spiral Inductor ◽

Power Supply Voltage ◽

Fine Grain

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Wide-Supply-Voltage-Range CMOS Bandgap Reference for In Vivo Wireless Power Telemetry

Energies ◽

10.3390/en13112986 ◽

2020 ◽

Vol 13 (11) ◽

pp. 2986 ◽

Cited By ~ 4

Author(s):

Ruhaifi Bin Abdullah Zawawi ◽

Wajahat H. Abbasi ◽

Seung-Hwan Kim ◽

Hojong Choi ◽

Jungsuk Kim

Keyword(s):

Power Supply ◽

Supply Voltage ◽

Channel Length ◽

Power Supply Voltage ◽

Voltage Range ◽

Power Supply Rejection Ratio ◽

Wide Range ◽

Reference Circuit ◽

Inherent Problem

The robustness of the reference circuit in a wide range of supply voltages is crucial in implanted devices. Conventional reference circuits have demonstrated a weak performance over wide supply ranges. Channel-length modulation in the transistors causes the circuit to be sensitive to power supply variation. To solve this inherent problem, this paper proposes a new output-voltage-line-regulation controller circuit. When a variation occurs in the power supply, the controller promptly responds to the supply deviation and removes unwanted current in the output path of the reference circuit. The proposed circuit was implemented in a 0.35-μm SK Hynix CMOS standard process. The experimental results demonstrated that the proposed reference circuit could generate a reference voltage of 0.895 V under a power supply voltage of 3.3 V, line regulation of 1.85 mV/V in the supply range of 2.3 to 5 V, maximum power supply rejection ratio (PSRR) of −54 dB, and temperature coefficient of 11.9 ppm/°C in the temperature range of 25 to 100 °C.

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