Abstract
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.
Highlights
Urbanization is increasing rapidly around the world
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 be configured without a separate gate amplifier power supply
The charging current ripple rate of a battery must be satisfied in order to preserve the lifespan of the battery, regardless of the charging current required in all charging voltage ranges. To meet both these requirements, this study develops an improved multilevel charging topology that can satisfy a wide range of battery charging voltages and charging current ripple rates
Summary
Urbanization is increasing rapidly around the world. According to the World. Charging systems need to generate a very wide range of output voltages to charge e-mobility devices with various voltage specifications in the range of 12–60 V from a single charging system, depending on the manufacturer and product type. Studies on such charging systems are in progress. The multilevel converters for e-mobility devices are characterized by the use of voltages as low as the driving voltage of the switching device for the input voltage of the converter Based on this characteristic, the converter circuit can be simplified by removing the gate amplifier power supply of the multilevel topology, which uses multiple switching devices according to the circuit configuration. Topology of the proposeddiode diodeparallel parallel structure converter (DPS-MLC)
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