Cordless and portable battery supplied equipments are proliferating thanks to the increasing capacity of rechargeable NiCd batteries. A usefull feature in applications where the battery is rapidly discharged, such as power tools, is the ultra fast charging in less then half an hour. The solution described in this paper is an efficient 100 kHz converter charging an NiCd battery in less then 15 minutes. The battery charge is monitored by a low cost micro-controller ST6210 enabling battery voltages identification, temperature monitoring and charge control.
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