Feature: Power
Figure 1: A conventional wireless charger design
Reliable power delivery – The wireless power evolution These changes require power – and, ideally, power that can be delivered reliably with little or no human intervention. But charging solutions requiring physical connections can be unreliable, in particular in hostile environments where rain, dust, mud and other pollutants may interfere with galvanic contacts, and in heavy-duty applications, which may cause premature wear of the systems. Wireless power systems, on the other hand, ensure total sealing and no wear at all. T at’s why advances in wireless charging are a vital step in
ensuring confi dence in these systems. And that means high power transfer capabilities, improved thermal management, higher effi ciency, and standards and charging interoperability are key priorities for technology companies and urban planners who don’t want the cost of tearing out infrastructure (for instance when they switch to a diff erent licensed fl eet company). Which is where the next generation of wireless charging comes in. While most people associate wireless charging with smartphones, the application base is increasing rapidly,
Figure 2: Eggtronic E2WATT wireless charging block diagram
largely enabled by the ability to transfer more power. The Qi wireless power standard was introduced by the Wireless Power Consortium (WPC) in 2009 to enable inductive charging for devices like smartphones. Initially, Qi supported low power transfers of up to 5 watts, suitable for small devices. Over the years, Qi has evolved to support higher power levels and adaptations such as the mooted LEV / EV standards. In 2021, the industry analyst Research and Markets predicted
the global wireless charger market is predicted to see year- on-year growth of almost 20 per cent between then and 2027. While much of this is anticipated to be driven by wireless charging pads and surfaces for smartphones and other portable devices, it also assumed that higher power applications from kitchen appliances to electric vehicles would start making more of a contribution. Jump forward three years and data from Grand View
Research suggests this estimate was conservative, with an accelerated growth of 23.5 per cent CAGR projected, and the growing adoption of Electric Vehicles (EVs) globally cited as a critical factor driving the adoption.
20 November 2024
www.electronicsworld.co.uk
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