Constant current/constant voltage control method for wireless electric energy transmission system based on primary side parameter identification

Abstract

The invention discloses a constant current / constant voltage control method for a wireless electric energy transmission system based on primary side parameter identification. The constant current / constant voltage control method comprises the following steps of: the step 1: constructing a PS-S compensation topology; the step 2: detecting and calculating the amplitudes and the phases of the voltage and the current of a primary side, calculating the mutual inductance, the load and the current and the voltage of a secondary side, and completing parameter identification; and the step 3: designing aconstant current / constant voltage control scheme. The mutual inductance, the load and the electric parameters at the secondary side are identified by detecting the voltage and the current of the primary side to achieve constant current / constant voltage control of the system. The method does not need communication between the primary side and the secondary side to avoid the influence of the communication delay on the dynamic response performance of the system.

Description

technical field [0001] The invention relates to the technical field of wireless power transmission, in particular to a constant current / constant voltage control method for a wireless power transmission system based on primary side parameter identification. Background technique [0002] With its flexible power supply, safe and reliable technical characteristics, wireless power transmission technology has been practically applied in many fields such as portable electronic equipment, household appliances, and biomedicine. In recent years, research has also been gradually carried out in the application of wireless charging for electric vehicles. [0003] Typical electric vehicle induction charging system: on the primary side, the single-phase or three-phase power frequency power is rectified and converted into DC power, and the high-frequency inverter converts the DC power into high-frequency AC power and injects it into the resonance where the energy transmitting coil is locate...

AI Technical Summary

Problems solved by technology

[0004] The optimization method of compensation topology and electromagnetic mechanism in the existing literature can improve the stable output of the system within a certain range of load or mutual inductance without complex control algorithms, but it needs to solve the switching of constant current / constant voltage charging mode, Decoupling between multi-coils and other issues, especially the dynamic response performance requirements of battery charging are ignored. Large overshoots caused by switch switching or parameter mutations will inevitably reduce battery life.

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