## 4 Experimental Verification  
The system model was built in MATLAB/Simulink for simulation analysis, and the parameters of the system are listed in Table 2. The ferrite core and litz wire parameters of the rotary coupling mechanism are consistent with the simulation. The data output \(U_{\text{DP}}\) comparison with or without parallel resonance (\(L_{\text{PP}}\), \(C_{\text{P2}}\), \(L_{\text{SS}}\), \(C_{\text{S2}}\)) and series resonant capacitance (\(C_{\text{DP}}\), \(C_{\text{DS}}\)) was obtained, as shown in Figure 5.  
It can be seen that the role of the parallel resonant circuit (\(L_{\text{PP}}\), \(C_{\text{P2}}\), \(L_{\text{SS}}\), \(C_{\text{S2}}\)) is to prevent the data from passing, so it is loaded onto the transmitting and receiving coils; if removed, the data will not be transmitted. The function of the series resonant capacitor (\(C_{\text{DP}}\), \(C_{\text{DS}}\)) is to suppress the interference of power on data transmission; if removed, the data interference will be very large. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline  & \(\mathbf{U_{\text{dc}}}\) (V) & \(\mathbf{U_{\text{Lref}}}\) (V) & \(\mathbf{f}\) (kHz) & \(\mathbf{f_{\text{D}}}\) (MHz) & \(\mathbf{C_{\text{P}}}\) (\(\mathbf{\mu\text{F}}\)) & \(\mathbf{C_{\text{T}}}\) (\(\mathbf{\mu\text{F}}\)) & \(\mathbf{C_{\text{S}}}\) (\(\mathbf{\mu\text{F}}\)) \\ \cline{2-9} Experiment & 48 & 48 & 25 & 1.25 & 1.69 & 0.28 & 0.24 \\ \cline{2-9}  & \(\mathbf{C_{\text{DP}}}\) (pF) & \(\mathbf{C_{\text{DS}}}\) (pF) & \(\mathbf{C_{\text{P1}}}\) (\(\mathbf{\mu\text{F}}\)) & \(\mathbf{C_{\text{P2}}}\) (pF) & \(\mathbf{C_{\text{S1}}}\) (\(\mathbf{\mu\text{F}}\)) & \(\mathbf{C_{\text{S2}}}\) (pF) & \\ \cline{2-9}  & 95.95 & 97.01 & 1.01 & 405.31 & 1.01 & 405.31 & \\ \hline Measurement & \(\mathbf{L_{\text{P}}}\) (\(\mathbf{\mu\text{H}  
A laboratory prototype was built, as shown in Figure 6. The experimental parameters are consistent with the simulation. Figure 5: The simulation results: (**a**) With parallel resonance (\(L_{\text{PP}}\), \(C_{\text{P2}}\), \(L_{\text{SS}}\), \(C_{\text{S2}}\)); (**b**) without parallel resonance (\(L_{\text{PP}}\), \(C_{\text{P2}}\), \(L_{\text{SS}}\), \(C_{\text{S2}}\)); (**c**) with series resonant capacitance (\(C_{\text{DP}}\), \(C_{\text{DS}}\)); (**d**) without series resonant capacitance (\(C_{\text{DP}}\), \(C_{\text{DS}}\)). Figure 6: _Cont._  
First, the effectiveness of the added power resonance circuit to suppress the influence of power on data transfer is verified, as shown in Figure 7, where data are transferred from the secondary side to the primary side. There is no power resonance circuit in Figure 7a, but there is in Figure 7b. Channel 3 indicates \(U_{\text{DP}}\) while channel 2 indicates \(U_{\text{DS}}\). It can be seen from Figure 7 that the transfer gain from \(U_{\text{DS}}\) to \(U_{\text{DP}}\) is essentially unchanged, regardless of whether there is a power resonant circuit or not. It can also be seen that when the power transmission is turned on, a small amount of clutter is mixed into the data, which is caused by the switching noise of the MOSFET in the power transmission loop. However, it can be filtered through the filter and does not affect the data transmission. To further verify the data transfer capacity, data transfer waveforms are tested when the power transfer is on and off, and the results are shown in Figure 8. Whereas Figure 8 indicates the forward data transfer results when the power transfer is off, Figure 8 indicates the forward data transfer results when the power transfer is on, Figure 8 indicates the backward data transfer results when the power transfer is off, and Figure 8 indicates the backward data transfer results when the power transfer is on. Channel 1 shows the primary-side modulation waveform, channel 2 is the secondary-side pick-up waveform, channel 3 is the secondary-side envelope demodulated waveform, and channel 4 is the output waveform shaped by the comparator. The data transfer rate was selected to be 19,200 bps.