Point of Sale (POS) terminals and ruggedized PDAs are used extensively in the retail, wholesale, logistics and manufacturing industries, and need to support a number of high power features, often at the same time, and sometimes at low temperatures. The power pulses needed for the radio frequency transmissions, and the additional peak currents which may be required by the thermal printer, a GPS module, or new display technologies such as OLED, can easily overload the battery, lowering its voltage and triggering premature shut-down of the device. This will happen even when there is plenty of spare energy in the battery, thus decreasing operation time of the device and the useful life of the battery.
A supercapacitor, working in tandem with the battery, discharges its power during the peaks and recharges between pulses. It delivers the power needed to operate the PDA for much longer periods, and extends battery life, particularly at the low temperatures often encountered in this market (e.g. in cold storage warehouses, parcel delivery, ski lift ticket scanning, restauarant billing, etc.).
The supercapacitors can also be used as an on-board “UPS”, enabling battery hot-swap, and eliminating battery “contact chatter” when the unit is dropped. Our products also eliminate most of the noise at 217Hz caused by GSM/GPRS pulses.