Specifications

Smart Battery Charger Specification
SBS Implementers Forum -Page 34- Revision 1.1
resulting charge condition is unsuitable, the Smart Battery could send new values to the Smart Battery
Charger as in the following example:
1. The Smart Battery sets the ChargingCurrent() of the Smart Battery Charger to 1A
2. The Smart Battery Charger responds by providing 0.95A, within its ±5% accuracy requirement.
3. The Smart Battery measures the charge current of 0.95A and calculates a new target of 1A/0.95A =
1.052A and set the ChargingCurrent() of the Smart Battery Charger to this value to correct the charge
current
4. The Smart Battery Charger responds by increasing the output current proportionally, to 1A.
5. The Smart Battery accepts this as the final charge current.
The Smart Battery could likewise set the ChargingVoltage() in the same fashion. Note that the decision to
“close the loop” is made by the Smart Battery’s manufacturer based upon the needs of the battery. There is
no additional requirement placed in the Smart Battery Charger or System Host.
NOTE: Safety factors must be a prime consideration when developing open loop or closed-loop
charging algorithms as described here. Since batteries pose a significant potential risk of fire and/or
explosion, the system designer must carefully match charger output accuracy to the charge profile
required by the cell types and pack configurations that may be used by a given system.
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