Abstract
Aiming at the output control issues of a lithium ion battery wireless charging system, a primary side control method based on load characteristic identification is proposed. The primary side impedance is calculated by detecting the effective value of the primary side voltage and current, and the mapping relationship between the equivalent load and the primary side impedance is established based on the AC impedance model. Using this mapping relation, the output of the secondary side can be regulated indirectly by controlling the input voltage of the inverter. Compared with the traditional control methods, the proposed control method not only eliminates the communication requirement between the primary side and secondary side, but also simplifies the hardware circuit design, reduces the complexity of the control circuit and also reduces the volume and cost of the system. In the paper, the impedance characteristics of the lithium ion battery at constant current and constant voltage stage are analyzed. The principle of the primary side control method is expounded and the realization method is given. The feasibility of the proposed control method is verified by simulation and experiment.
Highlights
Inductive power transfer (IPT) technology employs a high-frequency magnetic field to construct an energy transmission channel between power supply equipment and electrical equipment, realizing power transmission in a non-contact manner [1,2,3,4,5] and overcoming the disadvantages of traditional contact power supply under harsh environments
The commonly utilized control methods of IPT systems can be generally summarized as the direct control of the primary side, cooperative control of the primary and secondary side, and indirect control of the primary side
The charging characteristic curve of the battery is obtained by the traditional primary side direct control scheme, and the primary side impedance variation curve under the control scheme is obtained by the correspondence relationship between the primary and secondary side impedances
Summary
Inductive power transfer (IPT) technology employs a high-frequency magnetic field to construct an energy transmission channel between power supply equipment and electrical equipment, realizing power transmission in a non-contact manner [1,2,3,4,5] and overcoming the disadvantages of traditional contact power supply under harsh environments (such as high humidity, high temperature, high corrosion, and explosive environment). It is characterized by high reliability, high safety and low maintenance [6,7,8,9,10], and has been widely employed in electric vehicles [11], underwater robot [12] and other fields.
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