Abstract
Aiming at the reduction of the influence of the dead time setting on power level and efficiency of the inverter of double-sided LCC resonant wireless power transfer (WPT) system, a dead time soft switching optimization method for metal–oxide–semiconductor field-effect transistor (MOSFET) is proposed. At first, the mathematic description of double-sided LCC resonant wireless charging system is established, and the operating mode is analyzed as well, deducing the quantitative characteristic that the secondary side compensation capacitor C2 can be adjusted to ensure that the circuit is inductive. A dead time optimization design method is proposed, contributing to achieving zero-voltage switching (ZVS) of the inverter, which is closely related to the performance of the WPT system. In the end, a prototype is built. The experimental results verify that dead time calculated by this optimized method can ensure the soft switching of the inverter MOSFET and promote the power and efficiency of the WPT.
Highlights
Electric vehicles (EVs) have gained popularity in recent years, for their inherent environmental benefits of reduced gas emissions [1,2]
A typical EV wireless power transfer (WPT) system consists of AC/DC (PFC and BUCK circuit), DC/AC, resonant compensation network, transmitting coil and receiving coil, rectifier, and battery [8]
According to the above analysis, to ensure metal–oxide–semiconductor field-effect transistor (MOSFET) achieve zero-voltage switching (ZVS) and reduce the switching loss, on the one hand, the dead-time should be large enough to charge or discharge both the MOSFET’s and PCB’s parasitic capacitor, on the other hand, it is required that the inverter current be close to zero at the switching point, which means the dead-time should smaller than the diode freewheeling time
Summary
Electric vehicles (EVs) have gained popularity in recent years, for their inherent environmental benefits of reduced gas emissions [1,2]. As a new wireless power transfer technology, the resonant wireless power transfer (WPT) technology, which is based on magnetic field coupling between the transmitting and receiving coils, has been seen development in recent years [4]. With the characteristics of flexible application, safety, and reliability, WPT technology has been applied to various applications, such as medical implantation equipment, underwater robots, and electric vehicle (EV) charging [6,7]. A typical EV WPT system consists of AC/DC (PFC and BUCK circuit), DC/AC (inverter circuit), resonant compensation network, transmitting coil and receiving coil, rectifier, and battery [8]
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