Abstract
This paper presents a Light Electric Vehicle (LEV) fast charger with a Lithium-Ion Battery (LIB) and Super-Capacitor (SC). The LEV fast charger consists of an AC/DC rectifier and LLC (Inductor-Inductor-Capacitor) resonant Full bridge converter. The LLC resonant converter has high-efficiency and low switching loss because of Zero Voltage Switching (ZVS). So, it is used widely in the industry. In general, the fast charger algorithm uses the Constant Current (CC) mode and Constant Voltage (CV). The CC mode starts at first and then the CV mode finishes. However, there is a big control value gap between the CC mode and CV mode. Therefore, when changing from CC to CV, the transient state occurs. To compensate for the transient state, we propose a new control algorithm. By means of this algorithm, we can achieve a higher level of safety and stability. The fast charger with LIB of 800 Wh and SC of 50 Wh is analyzed and verified, and we obtain a maximum efficiency of 96.4%. The discussions are validated using the LLC resonant full bridge converter prototype at the laboratory level.
Highlights
Nowadays, environmental pollution and air pollution are key global issues
EVs and Light Electric Vehicle (LEV) have the advantage of requiring less maintenance and creating less noise compared to diesel or gasoline vehicles
We propose a fast charger prototype of a LEV with a Lithium-Ion Battery (LIB) of 800 Wh and SC of 50 Wh
Summary
Automobiles using gasoline and diesel fuel as they are the main cause of air and environmental pollution due to their exhaust gas. LEVs are electric vehicles with 2 or 4 wheels driven by a fuel cell, battery, or are hybrid-powered, and normally weighing less than 100 kg, for example, electric bicycles, kickboards and wheelchairs. EVs and LEVs cause the air to be clean as they do not exhaust gas. EVs and LEVs have the advantage of requiring less maintenance and creating less noise compared to diesel or gasoline vehicles. They need very high periods of charging time. The technology for fast charging has been to increase the power (W). If the voltage is increased, a potential difference occurs between the battery and converter output voltages
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