737 Flight Crew Operations Manual
Electrical -
System Description
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP 6.20.9
Battery Charger Transformer/Rectifier
Single Battery
The purpose of the battery charger is to restore and maintain the battery at full
electrical power. The battery charger is powered through AC ground service bus 2.
The battery charger provides a voltage output tailored to maximize the battery
charge. Following completion of the primary charge cycle, the battery charger
reverts to a constant voltage TR mode. In the TR mode, it powers loads connected
to the hot battery bus and the switched hot battery bus. The battery charger TR also
powers the battery bus if TR3 fails. With loss of AC transfer bus 1 or the source
of power to DC bus 1, the AC and DC standby busses are powered by the
battery/battery charger.
May 15, 2008
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