Abstract
This paper compares the efficiency of a modified wireless power transfer (WPT) system with a current‐fed dual‐active half‐bridge converter topology and a complete bridge converter topology for a current‐fed resonate compensation network with current sharing and voltage doubler. Full‐bridge topologies are widely used in current WPT structures. The C‐C‐L resonate compensation networks for dual‐active half‐bridge converter and full‐bridge converter topologies are built in this paper on both the transmitter and receiver sides. Due to higher voltage stress around inverter switches, series‐parallel (S‐P) tanks are not recommended for current‐fed topologies because they are not ideal for medium power applications. A series capacitor is connected to reduce the reactive power absorbed by the loosely coupled coil. As a consequence, the C‐C‐L network is used as a compensation network. Dual‐active half‐bridge topology is chosen over full‐bridge topology due to the system’s component count and overall cost. Soft‐switching of the devices is obtained for the load current. The entire system is modelled, and the effects are analysed using MATLAB simulation.
Highlights
The revolution in the development of electric vehicles has brought many modifications in charging strategies
Interval 3 [t2 < t < t3]: The resonant inductor current iLr2 flows through the diode D3, which results voltage across switch M3 to 0 and it results for zero voltage switch (ZVS) turn-on. iLr2 is given by the following: iLr2
Power stored in inductor Lr1 at t = t1 must be bigger than the power stored in system capacitance of switches M1 and M2 to facilitate ZVS of M1
Summary
The revolution in the development of electric vehicles has brought many modifications in charging strategies. Mode 7 [t6 < t < t7]: In this interval, diode D2 starts conducting through a difference of (iLr − iL) and M2 can use for ZVS turn-on. The converter waveforms and the current flow during different intervals of operation for the buck mode are shown in Figures 6 and 7, respectively. Interval 3 [t2 < t < t3]: The resonant inductor current iLr2 flows through the diode D3, which results voltage across switch M3 to 0 and it results for ZVS turn-on. The half cycle starts with the same operation cycle in order to complete the other half cycle
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