Hyundai i-30: Charging System / DC DC converter

Hyundai i30 (PD) 2018-2025 Service Manual / Engine Electrical System / Charging System / DC DC converter

Description and operation

Description

Due to the considerably more frequent occurrence of starting operations, the electrical load that occurs often leads to voltage dips in the vehicle network.

In order to stabilize the power supply for certain voltage-sensitive electrical components, a DC/DC converter is used in conjunction with the ISG function.

The DC DC converter supplies the relay with a voltage that also remains constant during the starting operation.

Via the test leads for input voltage and the start relay , the electronics decide whether the power is supplied to the output via the bypass or the DC/DC converter.

In the bypass mode, the on-board supply voltage is not fed across the DC/DC converter, rather is transferred directly to the outputs. In the booster phase, the vehicle voltage is adapted.

Operation Principle

•	In the ISG mode, if the power of an audio system turns OFF by drawdown while "Auto Starting" or "Idle Starting" function operates, replace the DC/DC converter.

Components and components location

Component Location

1. DC/DC converter [200W]

2. DC/DC converter [400W]

Schematic diagrams

Circuit Diagram

[200W]

[400W]

Repair procedures

Removal

[200W]

1.	Turn the ignition switch OFF and disconnect the battery negative (-) terminal.

2.	Disconnect the DC/DC converter connector (A).

3.	Remove the DC/DC converter (B) after removing the nuts.

[400W]

1.	Turn the ignition switch OFF and disconnect the battery negative (-) terminal.

2.	Remove the crash pad center lower cover. (Refer to Body (Interior and Exterior) - "Main Crash Pad Assembly")

3.	Disconnect the DC/DC converter connector (A).

4.	Remove the DC/DC converter (B) after removing the nuts.

Installation

Install in the reverse order of removal.

•	After reconnecting the battery negative cable, ISG function dose not operates until the system is stabilized, about 4 hours.

•	If disconnecting the negative (-) battery cable from the battery during repair work for the vehicle equipped with ISG function, Battery sensor recalibration procedure should be performed after finishing the repair work. (Refer to Charging System - "Battery Sensor")

Alternator

Description and operation Description The Alternator has eight built-in diodes, each rectifying AC current to DC current. Therefore, DC current appears at alternator "B" terminal...

Battery

Description and operation Description AGM Battery AGM battery is used for especially heavy load on the vehicle network depending on equipment and requirements...

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