Three-coil battery wireless charging system adaptive to battery charging curve

Abstract

The invention discloses a three-coil battery wireless charging system adaptive to a battery charging curve. The three-coil battery wireless charging system comprises a three-coil transformer, a direct-current power supply, a high-frequency inverter, a primary side compensation capacitor, a secondary side compensation capacitor, a battery, a secondary side rectifier bridge, an additional side rectifier bridge, an additional loop compensation topology and an additional compensation capacitor. According to the wireless charging system, the working frequency of the system and parameter values of additional loop compensation topology are reasonably designed, three coil loops are constructed, constant current output is obtained by adjusting the working frequency, and the primary side compensation capacitance and the secondary side compensation capacitance are determined according to the set working frequency; additional loop compensation parameters are determined according to the size of a constant voltage threshold value needed by a rechargeable battery, constant current-constant voltage self-adaptive switching and flexible adjustment of an output threshold value are achieved, constant current-constant voltage self-adaptive switching needed by the battery is achieved through three coil loops, complex control and frequency switching are not needed. The communication fault problem possibly caused by complex control and instability caused by frequency switching are avoided.

Description

technical field [0001] The invention relates to a three-coil battery wireless charging system with an adaptive battery charging curve, relates to wireless energy transmission technology, and belongs to the technical field of power generation, power transformation or power distribution. Background technique [0002] WPT (Wireless Power Transmission Technology) is a new type of power transmission method that realizes power transmission from the power source to the load without electrical contact through electromagnetic effects. Compared with the traditional wired power transmission method, it is flexible, convenient, safe and reliable, and has strong environmental adaptability. advantages, so it has received more and more attention. At present, inductive wireless power transfer technology has been widely used in consumer electronics, LED lighting, electric vehicle charging and medical equipment and other fields. Among them, the use of wireless power transfer systems to charge...

AI Technical Summary

Problems solved by technology

[0005] 1. The charging system adopts a two-stage structure, which can save one control design, but increases the commutation stage and complicated control;

[0006] 2. The composite topology of high-frequency switches connected in series within the topology. This composite topology produces high losses and costs;

[0007] 3. The dual-frequency switching charging system is adopted, and the charging is completed through frequency switching between constant current and constant voltage. This solution requires charging state detection, wireless feedback communication and active control, which increases the complexity of the control circuit and reduces the reliability of the system. , and requires communication between the primary and secondary sides, and the voltage gain is limited by the parameters of the loosely coupled transformer

[0008] To sum up, the current IPT system still has limitations in the switching between topological constant current and constant voltage and the improvement of flexibility

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