Circuit for a system for a contactless, inductive energy transfer

Simple SummaryContent extracted from patent full text and abstract with AI.

This invention describes a circuit for a contactless, inductive energy transfer system, specifically designed for charging or powering mobile devices. The system is divided into a primary side (typically in a charging station or base station) and a secondary side (the device to be charged), and transfers energy via two magnetically coupled coils separated by an air gap. It uses a resonant converter for efficient energy transfer and a stabilization stage (such as a linear regulator or switching converter) on the secondary side to ensure a stable output voltage for the load, all without requiring any signal feedback or communication channel between the two sides.

Use CasesContent extracted from patent full text and abstract with AI.

• Wireless charging stations for smartphones, tablets, and other portable electronics.
• Electric toothbrushes or other bathroom devices that require isolation from water and contaminants.
• Providing power to medical implants or sensors inside the body without electrical leads.
• Charging electric vehicle batteries without physical connectors.
• Industrial environments where equipment must be powered or charged in explosive or harsh conditions (e.g., chemical plants, underwater sensors, or robots).
• Rotating or moving machinery where traditional wired connections would be unreliable (e.g., slip rings or brush contacts).

BenefitsContent extracted from patent full text and abstract with AI.

• No need for physical electrical contact between power source and device, enhancing durability and user convenience.
• Eliminates the need for complex or bulky connectors and cables.
• Improved safety due to galvanic isolation, especially valuable in wet, explosive, or biologically sensitive environments.
• Reduced maintenance because there are no mechanical contacts that can wear out (like plugs or slip rings).
• Simpler device alignment and user operation—just place the device on or near the charger to begin power transfer.
• The stabilization stage on the secondary side allows for stable power output without intricate communication or feedback systems, simplifying system design and reducing cost.
• Adaptable to a wide variety of converter topologies to suit application-specific needs.

Technical Classifications (CPCs)

Inventors & Applicants

Patent Abstract

The circuit has a primary-sided circuit arranged on a primary side and connected with a primary-sided supply voltage. A secondary-sided circuit is connected with a load and includes an after-stabilization stage i.e. linear regulator. A transmission stage includes a resonant converter and a galvanic separation for contactless transmission of energy from the primary side over an air gap away from the secondary side. Two magnetically coupled coils are provided for inductive energy transmission and spatially separable from each other by separating the secondary side from the primary side.