Method for simultaneously identifying load and mutual inductance of multi-load wireless power transmission system

Abstract

The invention discloses a method for simultaneously identifying loads and mutual inductance of a multi-load wireless power transmission system, which comprises the following steps of: firstly, enabling a multi-load system to be equivalent to single-load systems with different working time sequences through a time division multiplexing method; voltage overshoot and instable voltage occurring in a time division operation identification algorithm are prevented through double filter capacitors and bus voltage adjustment; and then introducing a particle swarm algorithm, establishing a system steady-state circuit model, establishing a fitness function through a difference value between a sampling output voltage and a prediction output voltage, converting a parameter identification problem into an algorithm optimization problem, and carrying out optimal solution search on a to-be-identified parameter to replace a traditional calculation method, so that errors generated by a traditional equation are avoided. According to the method, only input and output voltages need to be sampled, the communication data volume is reduced, the circuit complexity is reduced, and the system size is reduced. According to the method, the load and mutual inductance of the multi-load wireless charging system can be identified in real time, and the working range of the wireless charging system is expanded.

Description

technical field [0001] The present invention relates to the technical field of wireless charging, in particular to a method for simultaneously identifying the load and mutual inductance of a multi-load wireless power transmission system. Background technique [0002] In recent years, wireless power transfer (WPT) has gradually been used in low- and medium-power electronic devices, while magnetically coupled resonant wireless power transfer (MCR-WPT) has a long transmission distance, high transmission power, and safety. Advanced advantages have become one of the main development directions of wireless power transmission. In the development process of wireless power transmission, the multi-load system has received extensive attention because it has more industrial significance. [0003] Compared with the single-load system, the multi-load system is more complex. Traditionally, there is a multi-frequency-based method to simplify the multi-load system. Modeling is still more d...

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Problems solved by technology

[0005] Traditionally, there is a genetic algorithm-based MCR-WPT mutual inductance and load identification method, which is based on the principle of energy conservation and equivalent load theory, and requires sampling of high-frequency AC voltage and current, which is difficult for general equipment One point, leading to the disadvantages of difficult real-time identification and signal sampling

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