| 摘要 |
<p>A power transmission system includes a loosely coupled air core transformer having a resonance frequency determined by a product of inductance (Lp) and capacitance (Cp)of a primary circuit including a primary coil. A secondary circuit is configured to have a substantially same product of inductance (Ls) and capacitance (Cs). A back EMF generating device, e.g., a battery, which generates a back EMF (Vbat) with power transfer, is attached to the secondary circuit. Once the load power of the back EMF generating device exceeds a certain threshold level, which depends on the system parameters, the power transfer can be achieved at higher transfer efficiency if performed at an operating frequency less than the resonance frequency, which can be from 50 % to 95 % of the resonance frequency.</p> |
