High-power-transfer-density capacitive wireless power transfer system for electric vehicle charging

An Improved LCL-L Compensation Topology for Capacitive Power Transfer in Electric Vehicle Charging

“…Double-sided LCLC topology in [21] can be simplified as double-sided LCL in [22] with only six external components. To further reduce the number of components, double-sided LC topology [23], [24] is proposed by developing from a series compensation circuit where only an external inductor and capacitor are connected in series and parallel with the capacitive coupler in each side respectively.…”

UQ eSpace

“…Figure 3 shows that the electric fields generated by each of the two coupling capacitors have opposite polarities. This demonstrates that current flows from primary to secondary through one capacitor, and from secondary to primary through the other [2]. This is what establishes the closed circuit, allowing power to flow from the primary side to the secondary side, whilst also providing a return path for the current [16].…”

“…• Does not require magnetic shielding to achieve high efficiencies. This eliminates the requirement for expensive ferrites [2].…”

“…Typically, capacitive WPT systems utilize two pairs of conductive metal plates, as depicted in figure 3. When an AC voltage is applied to the primary side, two coupled capacitors are formed, establishing a closed circuit [2]. Figure 3 shows that the electric fields generated by each of the two coupling capacitors have opposite polarities.…”

“…• Parasitic capacitances can potentially cause significant inefficiencies in the system, as a result of cross-coupling between the capacitor plates and the vehicle chassis [2].…”