Abstract
Aiming at the problems existing in the current radio energy transmission system, we propose a wireless power transmission (WPT) system with the parallel–parallel (PP)-compensated structure. The transmitter of the transmission system adopts a separate topological structure to suppress the current shock and noise. In order to improve the efficiency of the WPT, reduce the static loss, and reduce the current oscillation loss on the power side, the input current ripple can be improved by two parallel phase-shifting methods. In this paper, two topological theories are analyzed, and the simulation and experiment results verify the correctness of these theories under both static and on-load conditions. After the final two-way phase-shift, 61.99% of the ripple is reduced. It provides a new approach for the design of WPT systems with PP structure.
Highlights
In this paper, the wireless power transmission (WPT) system with the traditional parallel–parallel (PP)-compensated structure is improved
A PP resonant wireless power transmission system is proposed, and the input current model of input current, inductance current, and capacitance voltage are obtained from the two topologies by modal analysis and mathematical modeling of the transmitter topology
The correctness of the mathematical model of isolating DC (IDC) topology proposed in this paper is verified by simulation results
Summary
The wireless power transmission (WPT) system with the traditional parallel–parallel (PP)-compensated structure is improved. Since the current flowing through the inductance cannot mutate, the direct current (DC) is blocked by the circuit and only the alternating current (AC) flows through the capacitor and inductance. It has achieved the function of isolating DC (IDC) [4,5,6], and the circuit topology described above is called the IDC circuit topology. We propose an IDC transmitter circuit for wireless charging which can effectively improve the input current waveform of the resonant circuit, reduce the damage of current oscillation to the devices, and improve the system efficiency [7,8,9]
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