Test Setup
Initial Tests
Initial Test Results
FT1 - Power Transfer Efficiency Test (Passed)
FT2 - Misalignment Test (Passed)
FT3 - Current Detection Testing (Passed)
FT.4 - Data Communication Test (Passed)
ST.1 - NFC Coil Power Switching Test (Fail)
ST.2 - Rx System Rectification Test (Pass)
Current Tests
Power Transfer Efficiency
-
Peak power transfer of 41.2dBm [13.2W] was observed with a efficiency of 83.4%.
-
The amount of power being efficiently transferred meets the power requirements of the rectifying circuit
-
Power transfer efficiency decreases when going to higher power.
Power Transfer Efficiency With Lateral Displacement
-
When transferring 5W of power between source and load CSCMR coils a power transfer efficiency of 80% was observed.
-
The amount of power being efficiently transferred meets the power requirements of the rectifying circuit.
-
Power transfer efficiency decreases when going to higher power.
_edited.jpg)
Power Transfer Efficiency
-
Peak power transfer of 41.2dBm [13.2W] was observed with a efficiency of 83.4%.
-
The amount of power being efficiently transferred meets the power requirements of the rectifying circuit
Rectification Test
The receiving power subsystem, along with efficiency at various swept power levels at optimal operating frequency. Pin represents the signal leaving the receiving coil, which in this test was represented by a 50VDC RF Signal Generator supplying our 45dB power amplifier. With up to 500 mW of charge reaching the load, we are able to validate our requirement for the system to provide no less than 200 mW to the load under peak consumption.
Rectification Test Cont.
The receiving power subsystem, along with efficiency at various swept power levels at optimal operating frequency. Pin represents the signal leaving the receiving coil, which in this test was represented by a 50VDC RF Signal Generator supplying our 45dB power amplifier. With up to 500 mW of charge reaching the load, we are able to validate our requirement for the system to provide no less than 200 mW to the load under peak consumption.
Backscatter Communication
-
The receiving module was able to modulate backscatter
-
The built system (see Fig.10) was able to demodulate a 100kHz square-wave from a backscatter signal.
-
Base station MCU was able to use demodulated line code to turn system on and off.
Current Sensing
This figure depicts measurements of the current and voltage through our selected sensor against a reference value from a multimeter throughout the charging cycle of our chosen load, a 1S Lithium Polymer battery. These results validate our system’s ability to monitor load current within +/- 5 mA.