A constant current-constant voltage wireless charging system and charging method thereof

Abstract

The invention puts forward a constant current-constant voltage wireless charging system and a charging method thereof. The system comprises an inverter power supply, a primary-side circuit, a secondary-side switching circuit, and a rectifier and voltage regulator circuit. The high-frequency inverter power supply provides energy for the system, and outputs frequency and voltage required by the system. The primary-side circuit produces a high-frequency current irrelevant to the parameters of the secondary-side circuit at a transmitting coil. The secondary-side switching circuit receives wireless power, and then controls switching of the secondary-side circuit topology through a switch to complete switching from constant-current charging to constant-voltage charging. The rectifier and voltage regulator circuit is used for rectifying alternating current and voltage obtained by the secondary-side switching circuit into direct current and voltage for battery charging. According to the invention, switching control of constant-current / constant-voltage modes is performed at the receiving side of a wireless charging system, so data communication and information exchange between an energy transmitting side and an energy receiving side are avoided, and zero reactive power of the wireless charging system during mode switching and normal work is ensured.

Description

technical field [0001] The invention relates to the field of wireless charging of batteries, in particular to a constant current-constant voltage wireless charging system and a charging method thereof. Background technique [0002] Wireless power transmission technology has many advantages that traditional wired transmission methods do not have. Using wireless to charge small portable devices such as mobile phones can greatly improve the flexibility and comfort of use, and no longer need to carry redundant power supplies. Wire. [0003] Often, the transmission and storage of electric energy are equally important. Therefore, while relying on wireless power transmission technology to solve the problem of energy transmission, it is also necessary to solve the problem of efficient energy storage. At present, the common energy storage devices around us are batteries, especially lithium batteries. For lithium batteries, constant current (CC) and constant voltage (CV) charging are...

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Problems solved by technology

In addition, if there is no accurate theoretical derivation, the system designed using theoretical parameters will definitely deviate from the battery charging requirements in practical applications.

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