Abstract
The traditional wireless power transfer circuit uses the full-bridge or half-bridge inverter, which has complex circuit and control and low reliability. To solve these problems, a single-switch LC resonant circuit is proposed, which is simple in structure and can realize zero voltage switching (ZVS) without the problem of shoot-through. The circuit parameters and working process are modeled and analyzed. However, due to the influence of resonance, the common Si devices can not meet the demand because of the high blocking voltage of the switch. For this purpose, the circuit characteristics of SiC-based devices are studied, and the differences of driving and temperature characteristics between SiC MOSFET and Si MOSFET are compared. Finally, a single switch wireless power transfer (WPT) platform based on SiC MOSFET is built, which proves that SiC devices have great advantages in the field of WPT.
Highlights
In recent years, with the continuous development of wireless power transfer (WPT) technology, more and more fields adopt the way of wireless power supply or wireless charging
WPT can be divided into three basic forms: inductively coupled power transfer (ICPT), magnetically coupled resonant power transfer and microwave radio power transfer [1]
ICPT has been widely used in practice, such as electric vehicle wireless charging [2], implantable medical equipment [3], tail-free household appliances, marine exploration [4], underground mine power supply [5] and so on
Summary
With the continuous development of wireless power transfer (WPT) technology, more and more fields adopt the way of wireless power supply or wireless charging. Mode1 [t0-t1]: At time t0, the driving voltage of the switch Q becomes a high level, at which time, the current of the transmitting coil Lp is negative, and the switch Q is not turned on The voltage at both ends of the primary compensation capacitor Cp is the input supply voltage. At time t2, the driving voltage of the switch Q becomes a low level and the switch Q turns off At this model, the current in the receiving coil Ls is negative and positive. At time t4, the voltage of the primary compensation capacitor Cp is reversed to the maximum, the current of the transmitting coil Lp is reduced to zero, and the voltage across the drain source of the switch. When the mutual inductance is 38μH, the output power reaches its maximum, and the theoretical value of circuit efficiency is 92%
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