| Wireless Power Transfer Appliance with High Resistance to Inductive Coils Displacements for Powering Implanted Medical Devices |
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| Authors |
| | Gurov K.O. |
| | Mindubaev E.A. |
| | Danilov A.A. |
| | Selyutina E.V. |
| Date of publication |
| | 2022 |
| DOI |
| | 10.31114/2078-7707-2022-2-40-46 |
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| Abstract |
| | Currently, transcutaneous wireless power transfer (WPT) using inductive coupling is one of the main directions of power supply development for implantable medical devices (IMD). The proposed device relates to the field of medical technology and can be used to wireless supply power to active IMD. Also, the proposed device can find application in those areas of technology where there is a need for wireless power transfer over short distances, for example, in the field of power supply of portable digital devices and transport on electric traction.
One of the main problems in the design of devices for transcutaneous energy transfer using inductive coupling is the problem of minimizing the output power drops when changing the operating parameters of WPT. Offsets of the transmitting and receiving inductive coils relative to the nominal position have the strongest influence on the parameters change.
In the proposed device, the transmitting part of the WPT includes a class-E power amplifier (PA). The influence of the operating modes (nominal and subnominals) of the class-E PA was studied on increasing and stabilizing the output power of the WPT system when changing the relative misalignments of the transmitting and receiving coils. A distinctive feature of the proposed device is two capacitor (Cshunt and Cseries) in a class-E PA with variable capacitance. Cshunt and Cseries are designed to control the operating mode and therefore to achieve constant power.
The proposed device can transmit a constant power of 0.7 W to the WPT system load for a predetermined range of transmitting and receiving coils (coupling coefficient 0.6 ... 0.2). The theoretical coupling coefficient can take values from 0 to 1. Such data of proposed device were obtained using modeling in LTSpice and Matlab. At the same time, the drop in output power was no more than 3.5%, and the efficiency was more than 95%. This coupling coefficient corresponds to a symmetrical coil couple with an outer radius of 25 mm and 18 turns. Preliminary partial experimental studies were carried out using a model of the device, which shows its performance. |
| Keywords |
| | wireless power transfer; inductive coupling; class E power amplifier; displacement of inductive coils; implantable medical devices. |
| Library reference |
| | Gurov K.O., Mindubaev E.A., Danilov A.A., Selyutina E.V. Wireless Power Transfer Appliance with High Resistance to Inductive Coils Displacements for Powering Implanted Medical Devices // Problems of Perspective Micro- and Nanoelectronic Systems Development - 2022. Issue 2. P. 40-46. doi:10.31114/2078-7707-2022-2-40-46 |
| URL of paper |
| | http://www.mes-conference.ru/data/year2022/pdf/D014.pdf |
