Application Cases

Experiment Name: Experimental Study and Analysis of Wireless Power Transfer Mechanism and Energy Transfer Efficiency of Asymmetric Insulation Layer Coupling Device for Human Implantable Devices

Experiment Objective: To investigate the influence of parameters such as operating frequency, insulation layer thickness, electrode plate size, and implantation depth on the efficiency and safety of electric field coupling energy transfer. Based on COMSOL simulation and a fresh pork experimental platform, the transmission characteristics and biocompatibility of the asymmetric insulation layer coupling device were verified, providing an efficient and safe wireless power supply solution for implantable medical devices.

Testing Equipment: Electric field coupling experimental platform (including asymmetric insulation layer coupling device), impedance analyzer, signal generator, broadband power amplifier (Aigtek ATA-1220E), high-voltage differential voltage probe, oscilloscope, high-frequency rectifier and filter circuit, constant temperature chamber, fresh pork tissue medium, COMSOL Multiphysics simulation software.

Experimental Procedure: Fresh pork was used to simulate the human skin-fat-muscle multi-layer structure. Through a three-way comparison of AC-AC power transfer testing, COMSOL finite element simulation, and analytical calculation, the accuracy of the I-shaped model in predicting energy distribution and loss characteristics was verified. Further AC-DC experiments confirmed that the designed asymmetric insulation layer coupling device could transmit 75.2 mW to the load with an AC-DC efficiency of 40.6%, representing a 10.6% efficiency improvement compared to traditional symmetric structures. It also demonstrated stable energy transfer capability under different implantation depths, electrode plate misalignment, and bending conditions. Finally, electromagnetic safety assessment and biocompatibility testing verified the system's efficient energy transfer characteristics while meeting human safety limits.

Figure 1: Physical Diagram of the Experimental Setup

Figure 2: Flowchart of the Experimental System

Experimental Results: This study systematically verified the feasibility and superiority of transdermal electric field coupling wireless power transfer technology for human implantable devices. Using fresh pork to simulate the human multi-tissue layer environment, a complete test platform was built. It was confirmed that the designed asymmetric insulation layer coupling device, operating at a frequency of 6.78 MHz, could stably transmit 75.2 mW of power to the load with an AC-DC efficiency of 40.6%, achieving a 10.6% efficiency improvement and an 18 mW power increase compared to traditional symmetric structures. The error between AC-AC experiments and COMSOL simulations and analytical calculations was less than 5%, verifying the accuracy of the multi-tissue layer circuit model. Within a ±10 mm misalignment range, the system efficiency decreased by only 3-10%, demonstrating excellent anti-misalignment capability, while the rectifier circuit maintained over 80% efficiency over a wide load range. Safety assessment showed that under the SARavg ≤ 2 W/kg limit, tissue temperature rise was below 1°C, and electromagnetic interference was below 0.32 mV, fully complying with the IEEE C95.1 standard. Overall, this confirms that the technology provides safe, efficient, and stable wireless power supply capability.

Figure 3: Uin = 6.1 V, Simulation, Numerical Calculation, and Experimental Results

Figure 4: Uin = 6.1 V, Measured Values of System Output Power and System Efficiency

(a) Temperature rise distribution of asymmetric insulation layer (b) Temperature rise distribution of symmetric insulation layer

Figure 5: Cloud Diagram of Temperature Rise Distribution

Figure 6: Waveform of Asymmetric Insulation Layer Coupling Device at RDC = 100 Ω

Product Recommendation: ATA-1220E

Figure: ATA-1220E Broadband Amplifier Specifications and Parameters

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