Technology in Wireless Power Transfer (WPT)
Wireless Power Transfer (WPT) is a technology to transfer power between two objects without physical contact. WPT is commonly used in consumer products such as mobile phone chargers. The technology can also be useful in commercial applications, specially in high power cases. But technology needs to be further developed in the areas of efficiency, compactness, costs, and controllability. Etrixa continues to develops solutions to meet such requirements for high power WPT.
Topologies and configurations
We select coil topologies and system configurations based on system efficiency and costs in the target applications. The thermal and mechanical aspects are more important in selection of topologies for high power uses. Optimized modular design enables upscaling for very high power in parallel configurations.
Boosting of power transfer
With increase of air gap between the objects, more magnetic energy needs to be injected in the air space. Compensation circuits with high-speed AC capacitors are needed to excite such magnetic field with limited capacity of the transmitter and receiver converters.
Loss minimisation
To achieve as high as possible efficiency, new devices and materials are used in our solutions. The optimal designs of coils, compensation circuit, and converters are also important to consider electromagnetic, thermal, mechanical, and manufacturing aspects.
High frequency conversion
In order to transfer more energy with the limited size of coils, faster turnover of the magnetic energy is the key method. To achieve the high frequency, high-speed semiconductor switches, low AC loss cables, low loss core materials, and control method with high bandwidth are required.
System optimisation
WPT systems include many components and their strong interactions. System optimisation and balance are important for high performance and cost-effective systems. The maximun electromagnetic energy conversion within the defined space and under thermal and mechanical boundary conditions.
Control for uncertainties
WPT systems are required to work under uncertainties and variations. They need to handle misalignment of coils, variation of air distance , and change of voltage levels. Advanced control should be implemented to keep stable power flow between the transmitter and the receiver and deal with unexpected happenning.