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Name of experiment: modeling of capacitive single wire wireless charging system considering earth condition

Research direction：wireless power transmission

Content of experiment:

Under the condition that the circuit parameters of the system are determined, the resonance frequency of the system, the length of the single line and the load are changed to observe the electric energy that can be obtained by the load

Purpose of experiment：verify the correctness of the circuit model and CST simulation results

Test equipment: signal generator 33220A, power amplifier Aigtek ATA-122D, 2 aluminum plates with diameter of 200mm, 1 inductor 470uH, 0.4/0.4/0.6m copper wire with different radius of 1mm, resistors (200/500/600 ohm)

Experimental process：

In the experiment, the distance between two aluminum plates is set at 3mm, and the output voltage of the amplifier is connected to the aluminum plate at the bottom through an adjustable LCLC circuit, so as to ensure that the input voltage of the aluminum plate is kept at the amplitude of 100V at different frequencies. The aluminum plate above is connected to an inductor and a load and then to a copper wire, but the copper wire is suspended without anything, relying on the ground to form a loop to supply power to the load, because the ground is not a good conductor, so the system is not very efficient.

Result of experiment：

The results show that single-wire capacitive wireless charging works when it appears to have no loop, but actually forms a loop with ground. The load gets different power at different places and the load gets maximum power when the system is resonant.