Wireless charger suitable for any lithium battery

Abstract

The invention discloses a wireless charger suitable for any lithium battery, and belongs to the technical field of lithium battery wireless charging. The wireless charger uses a bilateral LCC compensation circuit as a topology, and at least two different frequency points are found by designing a set of compensation parameters, so that zero-reactive power is achieved, and the requirements for constant current and constant voltage needed by charging of any lithium battery are met. In order to achieve the work mode that constant current is obtained after constant voltage is obtained, firstly, a current loop controls a system to work in the constant-current mode, then the current loop is switched to a voltage loop when the voltage of the lithium battery reaches a constant-voltage charging threshold, and then the voltage loop controls the system to work in the constant-voltage mode. According to the wireless charger, direct-current converters do not need to be cascaded with a primary side and a secondary side, secondary voltage adjustment of front-stage or rear-stage DC / DC converters is not needed, the cost is reduced, the system complexity is reduced, and the reliability of the systemis improved.

Description

technical field [0001] The invention discloses a wireless charger suitable for any lithium battery and belongs to the technical field of wireless charging of lithium batteries. Background technique [0002] With the popularity of electric vehicles, lithium battery charging technology has become a research hotspot. The traditional charging method needs to plug and unplug the cable at any time, the weathering and wear of the cable insulation, and contact sparks pose a threat to the safe operation of the charging system. Wireless Power Transmission (WPT, Wireless Power Transmission) can achieve mechanical and electrical double isolation, which is convenient for working in harsh environments such as underwater and mines. According to the charging characteristics of lithium batteries, lithium battery charging includes two stages of constant current charging and constant voltage charging. Therefore, the wireless charging system needs to provide the battery with the required const...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the shortcomings of the above-mentioned background technology and provide a wireless charger suitable for any lithium battery. By designing the parameters of the bilateral LCC compensation topology, at least two different frequency points are found to satisfy the first constant current of any lithium battery. Realize the input of approximately zero reactive power while meeting the demand for constant voltage charging, which solves the technical problem that the existing wireless charging system is difficult to meet the charging demand of any lithium battery and the input DC bus voltage cannot be adjusted at will

Images