Robert Boschgmbh

Michael Ruffer

Thomas Knorpp

Markus Michels

Gholamabas Esteghlal

Daniel Raichle

Beqir Pushkolli

Stephan Binhack

Alexander Scheidle

Thomas Daub

Wolfgang Mollenkopf

The invention relates to a method () for charging an intermediate circuit capacitor () in a high-voltage network (). The high-voltage network can be connected to a power source () by means of at least one switch () and is coupled to a low-voltage network () by means of a DC voltage converter (). The method comprises the steps: determining () a first voltage (U) across the power source (); determining () a second voltage (U) across the intermediate circuit capacitor (); determining () a first difference (D) between the first voltage (U) and the second voltage (U); switching () the DC voltage converter () to the boost converter operating mode to charge the intermediate circuit capacitor () according to the determined first difference (D).

Method and device for charging an intermediate circuit capacitor in a high-voltage network

In a boost converter operation, a first voltage that is independent of an input voltage of the boost converter is preset in the boost converter, having an increased voltage level compared to the input voltage, as the setpoint output voltage, as long as the input voltage is below a first voltage threshold value, which is lower than the first voltage. As soon as the input voltage exceeds the first voltage threshold value, a second voltage that is a function of the input voltage is preset, having a lower voltage level compared to the input voltage, as the setpoint output voltage. As soon as the input voltage drops below a second voltage threshold value, which is lower than the first voltage, the first voltage is again preset as the setpoint output voltage.

Boost converter and method for its operation

The invention relates to an electrical drive system of a hybrid vehicle, comprising: a traction battery (), a high-voltage intermediate circuit (), a pulse-controlled inverter () which is coupled to the high voltage intermediate circuit (), an electrical machine () which is coupled to the pulse-controlled inverter (); a DC-to-DC converter () which is coupled to the pulse-controlled inverter () and the high-voltage intermediate circuit () and is designed to convert a high voltage (UE) from the high-voltage intermediate circuit () into a low voltage (UA) for a vehicle electrical system; a low-voltage battery () which is coupled to the DC-to-DC converter (); a plurality of selectively-connectable electrical consumers () of the vehicle electrical system, which are coupled to the low-voltage battery () and the DC-to-DC converter (); and a control device () which, in the event of a traction battery failure, is designed to operate the DC-to-DC converter () in a current-controlled manner using the electrical machine so as to supply said vehicle electrical system consumers ().

Control device for a DC-to-DC converter of an electrical drive system, and a method for operating a DC-to-DC converter

A device and a method for detecting a polarity reversal on a low voltage side of a DC voltage transformer in a dual-voltage vehicle electrical system, particularly in a motor vehicle. A current flow is enabled, in this instance, in a connecting line on the low voltage side of the DC voltage transformer by a controllable switching element, a current is detected in a connecting line on the low voltage side of the DC voltage transformer, with the aid of a current sensor system, the direction of the detected current is evaluated by an evaluation unit and a polarity reversal is detected if the direction of the detected current differs from an expected current direction.

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Ludwigsburg, Germany

Michael Ruffer