Sonata Plug-in Hybrid main systems
High-Voltage Electrical Isolation
Unlike the 12V electrical system that is grounded to the vehicle’s chassis, the Sonata
Plug-in
Hybrid’s high
-voltage electrical system is designed to be isolated from the vehicle.
Regulation of High-Voltage Electrical Current
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Current from the High-Voltage Battery is
controlled by the Power Relay Assembly
(PRA), which consists of Positive and
Negative Main Relays, a Pre-charge Relay,
Pre-charge Resistor, and the Battery
Current Sensor. The PRA is located inside
the High-Voltage Battery Pack Assembly
and controls the high-voltage power circuit
between the High-Voltage Battery and the
Hybrid Power Control Unit.
High-Voltage Safety System
There are multiple safety systems
incorporated into the Sonata Plug-in Hybrid.
The system that protects the High-Voltage
Electrical System is called the Battery
Management System (BMS). The BMS is
located inside the High-Voltage Battery
assembly and measures several parameters
to maintain the optimal performance of the
High-Voltage Battery. It controls the battery
cooling fan to ensure proper battery
operation. In addition, if a system fault
occurs, the BMS turns off the PRA to
protect the system.
PRA
Main BMS
Sub BMS
