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Integrated RF charging tech powers battery

Posted: 20 Mar 2009 ?? ?Print Version ?Bookmark and Share

Keywords:power battery? charging RF wireless? Li-ion?

The new PowerPlane MX Li-ion battery from Planar Energy Devices is targeted for applications that require self-sufficient milli-amp-hour (mAh) energy storage, compact geometry, mAh capacities and long duty cycles. The battery is available in a demo kit that includes an on-board wireless RF harvesting/charging system.

The new battery has an integrated RF wireless charging technology. The combined battery and wireless charging systemcalled the PowerPlane MXEfeatures charge circuitry that measures 29mm x 25mm x 0.5mm, only slightly larger than the battery, making the entire power source extremely compact.

By interfacing an advanced rechargeable battery with a small wireless recharge board, the MXE can greatly exceed the capabilities of both technologies, according to the company.

The battery has an operating voltage range of 3V to 4.2V. Users of the PowerPlane MX can expect over 500 full cycles. The company claims that in a pulsed scenario, thousands of cycles can be expected with negligible degradation in the capacity. The battery has a 1sec. pulse capability of up to 50mA.

The PowerPlant MXE was designed to meet the needs of applications where small primary batteries cannot provide the necessary endurance and where typical energy harvesters acting alone do not meet the capacities nor the reliability of batteries. The PowerPlane MXE is well-suited for wireless sensor suppliers seeking power sources for systems or networks where a need for constant maintenance is undesirable.

According to the company, the PowerPlane MX battery is the first rechargeable battery of its kind to host a high capacity within its thin form factor. It is targeted for applications seeking both power from a small form factor and long cycle life from its rechargeable nature. Depending on the current-time schemes of the applications, the PowerPlane MX can provide a solution that lasts over 30 months in operation.

The MX plus MXE are well-suited for applications in medicine, wander prevention, remote toll payment or security that have service lifetimes of over one year.

Planar has an innovative charging pad system that does not require the battery to be plugged in, but simply placed on top of the pad. The pad is ideal for a wallet full of smart banking cards or a personnel badge, where such devices when using Planar's PowerPlane MXE can rely on a direct recharge with zero connections.

The PowerPlane MXE demo kit will include a charge station pad and one PowerPlane MX mounted on a charging circuit board combining a planar antenna coil and charge/discharge control circuitry.

The system's control circuitry provides under/over voltage protection, charge control and a charge indicator light.

The charge station pad can accommodate more than five battery boards simultaneously. The battery can be trickled charged continuously or entirely charged in under 3hrs.

The PowerPlane MXE can be directly connected into the required applications. The accompanying battery is protected in a laminated packaging, adding further to the rugged nature of the system. The demo kit can be purchased for $350 from Planar's Website.

- Toni McConnel
Embedded.com





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