BMW I01 Product Information page 119

I01￿High-voltage￿Components
6.￿Charging￿the￿High-voltage￿Battery
6.2.6.￿Power￿electronics￿in￿the￿(EME)
The￿power￿electronics￿for￿the￿conversion￿of￿the￿AC￿voltage￿coming￿from￿the￿charging￿socket￿to￿direct
current￿voltage￿required￿for￿charging￿the￿high-voltage￿battery￿is￿housed￿in￿the￿electrical￿machine
electronics.￿The￿AC￿voltage￿is￿fed￿to￿the￿electrical￿machine￿electronics￿via￿a￿single-phase￿supply.￿The
input￿voltage,￿which￿can￿be￿processed￿by￿the￿electrical￿machine￿electronics,￿may￿be￿in￿the￿following
range:￿100 V￿to￿240 V,￿50 Hz￿or￿60 Hz.
The￿power￿electronics￿module￿is￿a￿unidirectional￿AC/DC￿converter,￿i.e.￿a￿rectifier.
At￿the￿output,￿which￿is￿separated￿galvanically￿from￿the￿input,￿the￿electrical￿machine￿electronics
supplies￿an￿electronically￿adjustable￿direct￿current￿voltage￿or￿an￿electronically￿adjustable￿direct￿current
flows.￿The￿specifications￿for￿the￿output￿voltage￿and￿the￿output￿current￿come￿from￿the￿function￿"High-
voltage￿power￿management"￿in￿the￿EME￿control￿unit.￿The￿values￿are￿calculated￿and￿adjusted￿by￿the
EME￿so￿that￿the￿high-voltage￿battery￿is￿optimally￿charged￿and￿the￿other￿consumers￿in￿the￿I01￿are
supplied￿with￿sufficient￿electrical￿energy.
The￿EME￿is￿designed￿so￿it￿can￿provide￿a￿maximum￿electrical￿power￿of￿3.7 kW￿on￿the￿output
side.￿This￿is￿charging￿configuration￿is￿used￿(in￿the￿US￿market)￿only￿when￿charging￿with￿the
occasional￿use￿cable￿via￿a￿household￿120V￿socket.￿And￿it￿sufficient￿to￿fully￿charge￿the￿I01
high-voltage￿battery￿under￿optimal￿marginal￿conditions￿in￿about￿16￿hours.
6.3.￿AC￿charging￿with￿7.4 kW
AC￿charging￿with￿7.4 kW￿is￿standard￿equipment￿for￿the￿US￿market￿(SA￿4U8￿AC￿Fast￿Charging)￿and￿it
is￿possible￿via￿a￿permanently￿installed￿AC￿charging￿station￿(wallbox).￿In￿order￿to￿deliver￿the￿charging
power￿of￿7.4 kW,￿the￿AC￿charging￿station￿must￿provide￿32￿A￿at￿a￿phase￿connection.￿P￿=￿U￿x￿I￿=￿230 V￿x
32 A￿=￿7360 W￿=￿7.4 kW.
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