An example of the evaluation kit components are: power transmitter with a transmitter coil, a universal power supply with 19V DC output voltage, a power receiver module with a receiver coil, and various headers and receptacles (for use in a developmental environment). The receiver module provides a regulated output voltage of 5V at 1A and a maximum of 5W power output. The power transmitter has the safety functions described above, as well as functions for monitoring the input voltage and the input current. The receiver also has integrated safety functions. Both the transmitter and the receiver are controlled with a microcontroller and use proprietary firmware. This allows for the easy adaptation of specific requirements. The kit is demonstration ready, and can also be integrated in a developmental environment.

Fig. 3 — Examples of coils used for inductive power transmission.
An example of another medical platform solution is 12W to 20W output, 12V to 20V range with a maximum current of 1 amp. The platform has been designed according to the guidelines of the IEC 60601-1 and IEC 60601-1-2 so that it can be used in medical applications. It consists of a transmitter and a receiver with the corresponding pair of coils, each with a diameter of 4 cm. The coil shape may vary, as shown in Figure 3. The receiver unit can provide a device with power, as well as charge a battery. A range of operating information and safety functions are integrated into the design and are also transmitted wirelessly.

The inductive coupling system solutions described above allow the use of wireless power in a range of medical applications, such as intensive care, home care, or im plants. For example:

• Hospital specific equipment, such as patient monitors, infusion pumps, pulse oximeters, etc., provide a significant advantage: since they are closed systems (no contacts) they can be easily cleaned and sterilized.
• Another application is an automated external defibrillator (AED) supplied with wireless power via a wall mount. At the same time, data from the AED is transmitted wirelessly to the wall mount that, in turn, sends the data to a server center for service monitoring.
• Devices implanted for myocardial support can be charged through the patient’s skin, which spares the patient extensive surgical procedures and eliminates the risk of infection. Data transmission makes it possible to carry out target queries for device information or carry out firmware updates.

In conclusion, the introduction of high efficiency wireless power solutions and the benefits that they provide, will continue to drive more and more medical devices to utilize this technology. The wireless power market is expected to take off with estimates of growth from $0.9 billion in 2011 to $23.7 billion in 2015.

This article was written by Michael Grossklos, Director of Marketing for RRC Power Solutions GmbH, Homburg/Saar, Germany. For more information, visit http://info.hotims.com/40439-163.

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