Abstract-An LCL-T resonant converter (LCL-T RC) is shown to behave as a current source when operated at resonant frequency. A detailed analysis of the LCL-T RC for this property is presented. Closed-form expressions for converter gain, component stresses, and the condition for converter design optimized for minimum size of resonant network is derived. A design procedure is illustrated with a prototype 200-W 20-A current-source power supply and experimental results are presented. The LCL-T RC as a current source offers many advantages such as easy parallel operation and low circulating currents at light load. Additionally, with appropriate phase shift in paralleled modules, the peak-peak ripple in output current is reduced and the ripple frequency is increased, reducing filtering requirements. The leakage inductance of a transformer can be advantageously integrated into the resonant network. These merits make the topology applicable in various applications such as magnet power supply, capacitor charging power supply, laser diode drivers, etc.Index Terms-Current supplies, dc-dc power conversion, resonant power conversion, soft switching. NOMENCLATURE AA term defined by (13

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Summary Phosphorus (P) scarcity constrains plant growth in many ecosystems worldwide. In P‐poor ecosystems, the biogeochemical paradigm links plant productivity with the deposition of P‐rich dust originating from desert storms. However, dust P usually has low bioavailability and is thought to be utilized solely via roots. We applied desert dust on the leaf surface of P‐deficient and P‐sufficient wheat, chickpea and maize to test the feasibility of direct foliar uptake of dust‐P and investigate its related acquisition mechanisms. Foliar dust doubled the growth of P‐deficient chickpea and wheat, crops originating near the Syrian Desert. P deficiency stimulated several leaf modifications that enabled acquisition of up to 30% of the sparingly soluble dust‐P that is conventionally perceived as unavailable. These modifications increased foliar dust capture, acidified the leaf surface and, in chickpea, enhanced exudation of P‐solubilizing organic acids. Maize (originating far from deserts) displayed only a marginal response to dust. The dramatic response of chickpea and wheat in comparison to maize suggests that plants that evolved in dust‐rich ecosystems adopted specialized utilization strategies. Interestingly, the abovementioned foliar responses are comparable to known P uptake root responses. Given that P limitation is almost universal, a foliar P uptake pathway will have significant ecological and agricultural implications.