Serial-in parallel-out wireless power transmission system and control method thereof

Abstract

The invention discloses a serial-in parallel-out wireless power transmission system and a control method thereof. The serial-in parallel-out wireless power transmission system comprises a first wireless power transmission module, a second wireless power transmission module, a transmitting end controller and a receiving end controller, the input end of the first wireless power transmission module is connected with the input end of the second wireless power transmission module in series, and the output end of the first wireless power transmission module is connected with the output end of the second wireless power transmission module in parallel; each wireless power transmission module adopts a single-stage control mode, so that the system structure is simplified, the loss is reduced, and the system transmission efficiency is improved; an input series connection mode is adopted, so that the voltage stress of an MOS tube is reduced under the condition of the same input voltage, the designdifficulty of a loose coupling transformer coil under the condition of low voltage output is also reduced, and the output capacity of the system is effectively improved by adopting a parallel connection output mode; and high-efficiency, reliable and balanced work of the system is realized through multi-loop control of input voltage, output voltage and output current in combination with a frequency conversion and phase shift control technology.

Description

technical field [0001] The invention belongs to the field of wireless power transmission, and in particular relates to a serial-in parallel-out wireless power transmission system and a control method thereof. Background technique [0002] Wireless power transmission technology uses the electromagnetic field as the medium to realize the transmission of electric energy. Compared with the traditional contact power transmission system, the wireless power transmission system is convenient and safe to use, has no spark and electric shock hazard, no dust accumulation and contact loss, no mechanical wear and corresponding maintenance problems, and can adapt to underwater, explosion-proof And other harsh environments and weather. With the rapid development of power electronics technology, the research and development of wireless power transmission technology has achieved a lot of research results, and many wireless charging products have come out, such as wireless charging of mobile...

AI Technical Summary

Problems solved by technology

In low-voltage and high-power applications, existing wireless power transmission products are implemented by two-level or three-level conversion, and the efficiency of the system is low due to multi-level conversion.

If single-stage conversion is used for applications where the voltage is too low, the coil design of the loosely coupled transformer is particularly difficult. Therefore, the present invention discloses a series-in-parallel wireless power transmission system and its control method, which can satisfy high-voltage input and low-voltage output Applications

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