A systematic approach for load monitoring and power control in wireless power transfer systems without any direct output measurement
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A new method is presented to monitor load impedance and control load power in wireless power transfer systems using only measurements of input voltage and current, without any direct output measurements. The method derives output load information mathematically from input measurements. It was tested successfully on an 8-coil wireless power transfer system, simplifying power control circuitry by eliminating sensors and communication devices on the load side.
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A systematic approach for load monitoring and power control in wireless power transfer systems without any direct output measurement
- 1. A Systematic Approach for Load Monitoring and Power Control in Wireless Power Transfer Systems Without Any Direct Output Measurement 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.