Unmet Need: Reduced Inductor Size for Power Systems
Inductive elements of portable electronic device battery charging systems remain bulky and expensive. This is true for wired charging via traditional DC-DC buck converters, but is compounded by consumer demand for devices which combine wired quick charging along with the convenience of wireless power transfer under the Qi standard.
The Technology: Single-Inductor Multi-Mode Charging and Large-Stepdown Switched-Inductor-Capacitor
WSU has developed two innovations in charging circuitry. First, where devices include both wired and wireless charging, a single inductor is used for both the Qi standard wireless power receiver and the DC-DC converter. Inductor savings make up for additional components. Second, where only wired charging is desired, a traditional buck converter is replaced by a large-stepdown switched-inductor-capacitor converter which operates with a smaller inductor.
• Portable electronic devices, e.g., smart phones
• Combining Qi-compatible charging with wired quick charging
• DC-DC converters
• Lower cost, size, and weight for inductive components
Intellectual Property Protection:
US Provisional Patent Application Filed