Specifications

Smart Battery Charger Specification
SBS Implementers Forum -Page 32- Revision 1.1
System Host
Smart Battery
Charger
Smart Battery
Vbatt
Charging Voltage/Current Requests
Battery Data/Status Requests
SMBus
Critical Events
AC-DC
Converter
AC
Safety
Signal
Master-mode only Host
(Unregulated)
(Master-mode only)
Non-DC Charging
Previous discussion of the charger output of ChargingCurrent() and ChargingVoltage() values has assumed
that the charger output contained no AC component. In practice, this is not the case as there will likely be
ripple riding on the intended DC value or the charger may purposely pulse the output.
Chargers that intend to output DC waveforms must be designed to minimize ripple. Tolerance of ripple,
whether voltage or current, varies from battery to battery depending on the cell type and Smart Battery
electronics. Care should be taken to match the ripple content of the charger output with the requirements of
the Smart Battery packs that will be connected to the Smart Battery Charger.
Certain Smart Battery Chargers are designed to pulse their outputs. Pulse charging is advantageous with
some cell chemistries as a method of decreasing charge time. It is also used to simplify the charger design
or reduce cost. Pulse charging is allowed by this specification as long as the charger, battery cells, and
battery electronics are compatible with each other and operate safely while employing this technique.