Abstract
A systematic method is presented in this paper to show that, based only on the measurements of the input voltage and current, the load impedance of a wireless power transfer system can be instantaneously monitored and load power controlled without using any direct measurement from the load. A new mathematic procedure for deriving the output load information based on input voltage and current is explained. This systematic method, which can be applied to wireless power systems with two or more coils, eliminates the need for sensors and communication devices on the load side, thereby greatly simplifying the power control circuitry. The principle of the load estimation method, the power loss optimization and control scheme are described and favorably verified with measurements obtained from an eight-coil wireless power transfer system. © 2014 IEEE.
| Original language | English |
|---|---|
| Pages (from-to) | 1657-1667 |
| Journal | IEEE Transactions on Power Electronics |
| Volume | 30 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - Mar 2015 |
| Externally published | Yes |
Bibliographical note
Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].Funding
This work was supported by the Hong Kong Research Grant Council under GRF Project HKU 712913.
Research Keywords
- Load estimation,magnetic resonance
- power control
- wireless power transfer
RGC Funding Information
- RGC-funded
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