Abstract
At present, in the practical application of magnetic resonance wireless transmission technology, because of the change of distance, relative position between transmitting coil and receiving coil and load, the output power and transmission efficiency of transmission system will be greatly affected. Therefore, in order to improve the output power and transmission efficiency. In this paper, a new frequency tracking control algorithm based on Cascaded Generalized Integrator PLL (CGI-PLL) structure is proposed. The new frequency tracking control algorithm is used in the series- series circuit of magnetic resonance. It is planned to use this algorithm when the transmitting coil is detuning to a certain extent and the receiving coil is resonant at the same time. The phase compensation and soft switch are realized by controlling the phase difference between the output voltage and the output current of the primary side inverter. The experimental results show that the phase between the output voltage and the output current of the primary measurement inverter can remain unchanged when the load and mutual inductance are changed. Therefore, the CGI-PLL detuning control algorithm can actively track the frequency of the system, improve the output power and transmission efficiency of the system, and provide conditions for the operation of ZVS soft switch. It is proved that the new control algorithm proposed in this paper is feasible and correct.
Highlights
The magnetic resonance wireless energy transmission system has a longtransmission distance and high transmission efficiency, which has attracted the attention of many scholars at home and abroad [1,2,3]
In view of the low transmission efficiency caused by the detuning, there are two main methods at home and abroad: one is adaptive impedance control, the other is passive frequency tracking control
It can be seen from (1) to (3) that the transmission efficiency and output power of the system are related to system frequency, load, mutual inductance, resonance capacitance, resonance inductance and other factors
Summary
The magnetic resonance wireless energy transmission system has a longtransmission distance and high transmission efficiency, which has attracted the attention of many scholars at home and abroad [1,2,3]. In view of the low transmission efficiency caused by the detuning, there are two main methods at home and abroad: one is adaptive impedance control, the other is passive frequency tracking control. In reference [14], the frequency tracking method of short-circuit current detection is introduced. This method can realize frequency tracking quickly, but the system is vulnerable to external interference, which will produce some errors. Based on literature [17], this paper adopts cascaded generalized integrator phase locked loop (CGI-PLL) [18] structure to filter input signals effectively and track frequency of input signals so as to improve precision and adaptive capability of PLL frequency
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