BMW 3: High-voltage connections
At the Electrical Machine Electronics, there is a total of three high-voltage
connections to connect the
lines for other high-voltage components. The connections for the electric A/C
compressor and the
electrical heating are on the convenience charging electronics.

The following simplified wiring diagram shows the high-voltage connections
between the Electrical
Machine Electronics and the other high-voltage components.

High-voltage connections of the Electrical Machine Electronics
- Electrical heating
- Electric motor
- High-voltage battery unit
- 12 V battery
- Charging socket
- Electric A/C compressor
- Unidirectional AC/DC converter
- Convenience charging electronics
- Electrical Machine Electronics
- Bidirectional DC/AC converter
- Unidirectional DC/DC converter
- Anti-overload current guard (90 A)
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The high-voltage cables connect the high-voltage components and are
identified by orange cable
sleeves. The manufacturers of hybrid cars have agreed on a uniform
identification of the high-voltage
c
Bridge for high-voltage interlock loop
Before the high-voltage connector can be
disconnected, the bridge for the high-voltage
interlock loop must first be removed. The bridge
closes the circuit
The following figures show the approach for releasing the round high-voltage
connector, as used
for example on the high-voltage cable from the Electrical Machine Electronics to
the convenience
charg
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Concept
At blind driveways or when driving out of diagonal
parking spaces, approaching cross traffic is
detected sooner by the system than is possible
from the driver's seat.
General information
Two radar sensors in the rear bumper monitor
the area behind the vehicle.
The system indicates approach
The DC/DC converter in the Electrical Machine Electronics of the G20 PHEV is
able to adopt the
following operating modes:
Standby (also in the event of a component fault or short circuit, power
electronics off)
Buck mode (energy flow to the low-voltage side, converter adjusts
voltage on