A three-coil wireless battery charging system with adaptive battery charging curve

Abstract

The invention discloses a three-coil battery wireless charging system with adaptive battery charging curve, comprising a three-coil transformer, a DC 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, additional loop compensation topology and additional compensation capacitors. The wireless charging system of the present invention constructs three coil loops by reasonably designing the system operating frequency and the parameter values ​​of the additional loop compensation topology, obtains a constant current output by adjusting the operating frequency, and determines the size of the primary and secondary side compensation capacitors according to the set operating frequency , determine the additional loop compensation parameters according to the constant voltage threshold required by the rechargeable battery, realize the adaptive switching of constant current-constant voltage and the flexible adjustment of the output threshold, and realize the constant current-constant voltage automatic adjustment required by the battery through three coil loops Adaptive switching does not require complex control and frequency switching, which avoids the communication failure problem and the instability caused by frequency switching that may be caused by complex control.

Description

technical field [0001] The invention relates to a three-coil battery wireless charging system with an adaptive battery charging curve, relates to a wireless power transmission technology, and belongs to the technical field of power generation, transformation or distribution. Background technique [0002] WPT (Wireless Power Transmission Technology) is a new type of power transmission method that realizes power transmission from power source to load without electrical contact through electromagnetic effect. Therefore, it has received more and more attention. At present, inductive wireless power transmission 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 lithium batteries has great potential for development. [0003] The charging process of lithium batteries is mainly divided into two stages: constant current and constant ...

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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