Multiple Output Contactless Inductive Power Transfer System For Electric Vehicle Battery Charging Station

Abstract

The proposed system is designed to charge the three different duty vehicles (based on the charging power): heavy-duty vehicle, medium-duty vehicle and small duty vehicle through three different modules (Module-A, B and C) which are connected to one common DC bus. In the proposed system, each module consists of two inductive coils. One is embedded into EV body along with a rectifier and DC-DC converter as a receiver. However, another coil is embedded into the road (on the ground) along with DC-DC converter and high-frequency inverter as a transmitter. Additionally, each module consists of two matching networks with a compensation circuit for effective power transfer. For the analysis and designing of rapid fast charger for different duty range EV, the typical specification of different duty range EV are used. For fast charging of heavy-duty range EV, required charging voltage and current are high (600A/550A) as compared to medium (350V/135A) and low (200V/125A) range EV. To achieve these requirements, different ratings of the converter are utilized in the respective charger.In the proposed system, the dedicated qZS boost converter is utilized to boost the input voltage up to required high voltage demand. However, the receiver buck converter steps down the voltage (step current) to the required level to charge the battery. In the proposed system, by controlling the buck converter the battery is charged either in CC or CV mode. Additionally, the two matching networks together compensate for the capacitive reactance of the coupling plates. The proposed system provides rapid DC charging for different duty range EVs from the AC grid along with a controlled rectifier or DC grid thereby reducing the cost, volume density, and complexity of the charging system