Implementation of an E-Bike Charger Using Cuk Converter and Resonant LLC Converter

This paper offers a two-wheeler e-bike charging technique. A Cuk converter is used to construct an electric bike charger (EBC), which is then followed by an HBLLC resonant converter with better input power quality. Due to the pulse width modulation (PWM) functioning of the Cuk converter’s discontinuous conduction mode (DCM), the input current is shaped utilizing a voltage follower technique. As a result, the control loop is simpler since it only has one voltage loop. The battery charging technique employs a half-bridge LLC, diode rectification, and a resonant converter with variable frequency control. To charge a 20Ah e-bike battery, a 550W constant current/constant voltage (CC/CV) charger with the highest current rating may also be used to charge. The range of output voltage varies from 42V to 80V in e-bike, and it is increased by a variable DC link voltage reference estimator, that modifies the DC link voltage. A resonant frequency optimization method is also recommended to reduce turn-off losses while recharging severely depleted batteries. The performance of this charger has been meticulously tested in steady-state and dynamic conditions, and it was observed that the input power quality complies with international standard IEC-61000-3-2.