Meaning
Electromagnetic fields transfer energy across an air gap to power a receiver without a direct electrical connection. Inductive energization relies on a transmitter coil generating a varying magnetic field that induces a current in a secondary coil. Smart devices utilize this method to charge internal batteries through sealed enclosures.
Transfer Mechanism
Resonance between the transmitter and receiver circuits improves the distance over which power moves. During inductive energization, the control logic monitors the voltage on the secondary side to prevent overcurrent events. This feedback loop ensures the battery receives a steady flow.
Coupling Efficiency
Alignment between the two coils dictates how much energy is lost as heat. If the device shifts from its center, inductive energization becomes less effective and the thermal load on the enclosure increases. Foreign object detection circuits stop the process if metal enters the field because the metal would heat up rapidly and damage the device.
The air gap must be kept consistent to maintain the coupling coefficient.
Operational Constraint
Metallic housings block the passage of magnetic flux and prevent the charging of the internal cell. Plastic or ceramic materials are necessary for inductive energization to work in a portable product. The thickness of the material must stay below a defined limit to maintain the field strength.
