Abstract
This paper describes the analysis of the wireless power transmission including recent progresses in non-radiative wireless power transmission (WPT) and the improvement methods. Generally, WPT transmitter side consists of a DC supply voltage source, inverter/power amplifier, transmitter impedance matching device (IMD), source resonator and primary coil. The WPT receiver meanwhile consists of the secondary coil, device resonator, receiver IMD, rectifier and load. In order to achieve an efficient WPT, the WPT transmitter must transmit energy with minimum loss at the receiver side. This setup can be achieved by employing the power amplifier (PA). In this paper, the power amplifier in wireless power transmission for portable devices was designed. A Class E power amplifier was proposed and designed to improve the WPT transmitter side. The effects of zero voltage and zero derivative voltage switching on PA with optimization method was also discussed.
Highlights
Wireless power transfer was first invented by Nicola Tesla in the early 1890s [1]
Power is transmitted through the antenna which propagates through air or vacuum over a distance in the form of electromagnetic waves [4]
In non-radiative transmission, power transfer depends on the nearfield magnetic coupling of conductive loops
Summary
Wireless power transfer was first invented by Nicola Tesla in the early 1890s [1]. His initial setup was based on magnetic resonance and near-field coupling of two-loop resonators. It is hard to implant a Class DE power amplifier on a printed circuit board (PCB) [33] and adding two transistors will increase the cost Taking these factors into consideration, this paper studies the Class E power amplifier which is selected to improve the efficiency of power transfer from input to the transmitter coil of the WPT system [57]. The Class E power amplifier consists of a switching mode transistor (IRF540), a shunt capacitor (Cs), RF choke (L1), series LC circuit resonator (L2 and C2) and load (R). In the simulation and experiment, besides 5 V, the supply voltage of 9 V and 12 V has been used to simulate the practicality of the designed power amplifiers
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