Self-regulated reconfigurable resonant voltage/current-mode method and device for extended-range inductive power transmission
AssigneeThe Penn State Research Foundation
InventorsMehdi Kiani, Hesam Sadeghi Gougheri
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Abstract
A current-based resonant power delivery (CRPD) device and method with multi-cycle switching that enables efficient inductive power transmission at large distances. The proposed CRPD switches the Rx LC-tank for several cycles to utilize it as a current source. Therefore, the voltage across the load (RL) can be significantly higher than the Rx LC-tank voltage. In CRPD, the energy may first be stored in the receiver (Rx) coil by shorting the Rx LC-tank for several power carrier cycles. At the peak of Rx coil current, the coil energy may then be transferred to load (RL) for a quarter of the power carrier cycle.
Claims9
A current-based resonant power delivery method for inductive power transmission to a load, comprising the following steps:
- providing a current-based resonant power delivery device, comprising;
- a transmitter coil;
- a receiver circuit, the receiver circuit having a receiver coil, a resonance capacitor, a first switch, a rectification device, and a load capacitor;
- and
- the transmitter coil configured to energize the receiver coil, the receiver coil connected to the load via the resonance capacitor and the rectification device, the first switch having a first state and a second state, the receiver circuit configured to build up and transfer energy between the receiver coil and the resonance capacitor by bypassing the load during the first state of the first switch, the receiver circuit further configured to transfer energy from the receiver coil to the load during the second state of the first switch, wherein the receiver coil and the resonance capacitor are connected in a series connection, the first switch is connected in parallel with the series connection, and the rectification device is connected between the resonance capacitor and the load;
- energizing the transmitter coil;
- selecting the first state of the first switch and thereby bypassing the load during the first state of the first switch for at least one full power carrier cycle for building up and transferring energy between the receiver coil and the resonance capacitor for a pre-determined time for obtaining a desired load voltage across the load, the desired load voltage being more than a receiver coil voltage;
- and
- selecting the second state of the first switch for transferring the energy from the receiver coil to the load after the pre-determined time.
Dependencies are inferred from the claim text.