Multi-load wireless power transmission system with constant power and constant efficiency characteristics

Abstract

The invention discloses a multi-load wireless power transmission system with constant power and constant efficiency characteristics. The multi-load wireless power transmission system comprises a transmitting device and at least two receiving devices, the transmitting device is composed of a direct-current power supply, a full-bridge inverter, a transmitting side resonant capacitor module, a transmitting coil, a current sampling circuit, a zero-crossing comparator and a driver which are connected in sequence. The transmitting side resonant capacitor module comprises a transmitting side switch controller, a transmitting side communication module and at least two parallel switched capacitor branches, and each switched capacitor branch is formed by connecting a transmitting side switch and a transmitting side resonant capacitor in series; each receiving device is composed of a receiving coil, a receiving side resonance capacitor module and a load which are connected in series, and the receiving side resonance capacitor module comprises a receiving side resonance capacitor, a receiving side switch, a receiving side switch controller and a receiving side communication module which are connected in sequence. The method has the characteristics of constant power and constant efficiency, high system spatial freedom degree, high robustness, simple circuit structure and easiness in implementation.

Description

technical field [0001] The invention relates to the technical field of wireless power transmission, in particular to a multi-load wireless power transmission system with constant power and constant efficiency characteristics. Background technique [0002] Wireless power transmission technology directly transmits power to the load through the air without wires or other physical connections, and has the advantages of flexible and convenient power transmission. It is widely used in portable electronic devices, household appliances, electric vehicles, and implanted medical power supplies. For a long time, the power supply object of the wireless power transmission system is mostly a single load, and only "point-to-point" wireless power transmission can be performed. The system utilization rate is low, the space degree of freedom is low, and the system transmission performance is sensitive to the change of the load position. With the increasing number of electrical and electronic ...

AI Technical Summary

Problems solved by technology

However, the existing single-input multiple-output multi-load wireless power transmission systems all adopt the principle of inductive or resonant wireless power transmission. When the load position or direction changes, the output power and transmission efficiency of each load will change significantly, and the constant power cannot be maintained. , Constant efficiency output, short axial movement distance of the load, small radial offset range, and low spatial freedom

In order to improve the degree of spatial freedom, the existing technology often adopts increasing the area of ​​the transmitting coil, adopting a three-dimensional transmitting coil or adding an additional compensation circuit, but at the same time it brings problems such as excessive system volume, increased cost, complicated control, and reduced reliability.

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