Office of Commercialization  Wireless and DC Battery Charging with Reduced Bulk Inductors
Wireless and DC Battery Charging with Reduced Bulk Inductors

Wireless and DC Battery Charging with Reduced Bulk Inductors

Description:

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. 

Applications:

•  Portable electronic devices, e.g., smart phones

•  Combining Qi-compatible charging with wired quick charging

•  DC-DC converters

 

Advantages:

•  Lower cost, size, and weight for inductive components

 

Intellectual Property Protection:

US Provisional Patent Application Filed

Patent Information: