Wireless charging transmitting device, wireless charging receiving device, wireless charging system, and resonance parameter matching method

Abstract

A wireless charging transmitting device, a wireless charging receiving device, a wireless charging system, and a resonance parameter matching method are provided. The system includes: a conversion circuit for generating high-frequency alternating current; a primary-side resonance circuit including a resonance capacitor Cp, a primary coil Lp, and a compensation inductor L1, wherein the Cp and the Lp are connected in parallel between the two output ends of the conversion circuit and are for generating an alternating electromagnetic field through resonance, and the L1 is connected between a parallel node of the Cp and the Lp and the conversion circuit; a secondary-side resonance circuit including a secondary coil Ls, a resonance capacitor Cs and a compensation inductor L2, wherein the Ls andthe Cs are connected in parallel and are used for generating alternating current through magnetic field inductive coupling, one end of the L2 is connected to a parallel node of the Ls and the Cs, andthe other end of the L2 and the other parallel node of the Ls and the Cs are used as two output ends to output alternating current; and a rectifier circuit and a battery management module which are successively connected to the secondary-side resonance circuit. The L1 and the L2 can reduce the voltage and current stress of an inverter device and a resonant device, provides a device with greater power at the same current, and improves the charging power and efficiency when the battery is wirelessly charged.

Description

technical field [0001] The present invention relates to the technical field of wireless power transmission, in particular to a wireless charging transmitting device, receiving device, system and resonance parameter matching method. Background technique [0002] In products such as drones, electric vehicles, robots, and household appliances, rechargeable batteries are usually used to provide energy, and wired chargers are commonly used when charging the batteries. For example, for unmanned aerial vehicles, it uses lithium batteries to provide energy. Due to the particularity of the unmanned aerial vehicle itself, it requires light weight and limited space. Lithium battery is charged. However, in some special application scenarios, or for products with special needs, using a wired charger to charge the battery may have problems such as poor contact, overheating and burning, which limits the charging demand of the battery. With the advancement of science and technology, wirel...

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Problems solved by technology

However, when these four types of simple topologies are used, affected by the magnetic flux leakage and coupling coefficient of the electromagnetic coupling in the topology, the current and voltage stress of the inverter device and the resonant device are relatively large, so that the charging power of wireless charging is small and the charging efficiency is low. Low

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