Power supply for mobile devices: Page 4 of 10

November 04, 2014 //By Michael Mueller
Power supply for mobile devices
Michael Mueller of congatec considers what to look for when selecting a power supply for mobile devices.
declaration is mandatory.

Overview of major target markets:

The battery meets all relevant standards for use in the following markets:

 

Good for small batches
Certifications are expensive and the RRC battery packs meet far more requirements and regulations than is common practice. Because the cost of certification tests for standard battery packs gets distributed over large quantities, it does not significantly impact the overall price. This is a clear advantage for developers of small-scale applications who can buy these internationally approved battery packs directly from stock. RRC paves the way for device manufacturers to a successful export business; registration of the final device is easier with the available certificates.

Application-specific builds
The small, flat battery packs don’t always fit into the concept. For instance, when the batteries need to fit into the handle-like grips of a tablet computer. Provided that the incurred one-time costs for design and approval procedures are distributed over a large enough number of devices, RRC builds customized battery packs. The decision to develop a custom solution is a purely economic decision between potential value-add vs incurred costs.

2. Power distribution
The Smart Battery Manager (SBM) converts the voltage of the power supply or battery pack into different voltage levels for the application. If the device has more than one battery or if it is additionally supplied by the mains, the SBM distributes loads and currents dynamically as directed by the internal microcontroller. To enable device manufacturers to quickly develop a mobile device, congatec has created the SBM3 module as a reference design that supports up to two battery packs in the configurations 2S to 4S. congatec develops and manufactures standardized computer modules for OEMs. The SBM3 is part of a new Qseven Starter Kit for mobile embedded applications and provides a complete battery management subsystem. It was developed for congatec’s low-power COM Express and Qseven modules.

 
Fig 2: Block diagram illustrating how SBM3, carrier

Design category: 

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