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Engine Electrical System

DC-DC Converter Description and Operation

In this manual: Engine Electrical System
General Information — 15Maintenance — 7Engine Mechanical System — 84Engine Electrical System — 49Emission Control System — 22Fuel System — 95Clutch System — 28Manual Transmission — 21Dual Clutch Transmission (DCT) System — 47Drive Shaft and Axle — 20Suspension System — 36Steering — 23Restraints — 39Brake System — 54Body (Interior and Exterior) — 209Body Electrical System — 254Heating, Ventilation, and Air Conditioning — 56
~1min read

Description

Due to significantly more frequent starting, the resulting electrical load often causes voltage dips in the vehicle network. To stabilize the power supply for some voltage-sensitive electrical components, a DC-DC converter is used in combination with the ISG function. The DC-DC converter supplies a voltage to the relay that also remains constant during the starting operation. The DC-DC converter is installed at the rear of the glove box. Through the sensing wires for the input voltage and the starting relay, the electronics decide whether power is supplied to the output via the bypass or via the DC-DC converter. In bypass mode, the vehicle network voltage is not supplied through the DC-DC converter; instead, it is transmitted directly to the outputs. In the booster phase, the vehicle voltage is adapted.

Operating Principle

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