Application Cases

Experiment Name: Application of Power Amplifier in Implantable Wireless Power Transfer

Research Direction: Research on Electric-Field-Coupled Wireless Power Transfer for Implantable Medical Devices

Experimental Content: This study focuses on electric-field-coupled wireless power transfer for implantable devices in the human body. An accurate circuit model was established for the multi-tissue-layer environment of the human body, and the structure of the coupling device was designed accordingly. Experiments were conducted using the designed coupling device, and the results were compared with simulations and analytical calculations to verify the accuracy of the circuit model and the energy transfer capability of the coupling device.

Test Equipment: Signal generator, ATA-1220E broadband power amplifier, oscilloscope, etc.

Experimental Process:

Figure: Experimental system diagram

During the experiment, a high-frequency AC power source was required to supply energy to the transmitter side. A signal generator connected to the ATA-1220E broadband power amplifier was used to generate a 6.78 MHz sinusoidal voltage as the input power source. The voltages and currents on the transmitter and receiver sides were measured using an oscilloscope to calculate power and efficiency. An experimental platform was built using fresh pork as the energy transfer medium, and variable load experiments were conducted.

Experimental Results:

Figure: Experimental results 1

Figure: Experimental results 2

Due to differences in the dielectric properties between pork tissue and human tissue, there were some discrepancies between the experimental results and the COMSOL simulation results, as well as the numerical calculations. However, within an acceptable error margin, the accuracy of the proposed multi-tissue-layer link model was demonstrated. Ultimately, 106.6 mW of power was delivered to the load with an efficiency of 45.28%. This power level is sufficient to wirelessly charge a cardiac pacemaker for one hour, enabling it to operate for 30 days.

Recommended Power Amplifier: ATA-1220E

Figure: ATA-1220E broadband amplifier specifications and parameters