Seg Automotive Germany Gmbh

Murugaperumal Devaraja

Nima Saadat

Timm Lohmann

Christian Riecken

Christian Stigler

Kaveh Haghverdi

Felix Egbert

Vivek Tailor

An overvoltage protection circuit for an electric machine has a series connection of at least two overvoltage protection units, each having a switching unit connected in parallel. Each overvoltage protection unit includes at least one overvoltage protection component that limits a voltage, dropping across this component, to a component voltage limit. At least one of the overvoltage protection units includes at least two overvoltage protection components. A voltage tap is provided between two of overvoltage protection components. A method of checking the overvoltage protection circuit includes detecting a voltage present at the overvoltage protection circuit, switching the switching units into different switching configurations and determining a measured value of a voltage present at the voltage tap in each of the switching configurations, comparing the measured values in each case to an associated comparative value, and determining the functionality of the overvoltage protection circuit based on comparison result.

Method and processing unit for checking an overvoltage protection circuit for an electric machine, and converter arrangement

An activation system for operating an electric machine includes a control circuit device for activating a rotor winding, and having a highside switch, a semiconductor component, and a de-excitation switch. A first terminal of the rotor winding is connectable to a positive supply terminal via the highside switch and to a negative supply terminal via the semiconductor component. A second terminal of the rotor winding is connectable to the negative supply terminal via the de-excitation switch. The activation system is configured to attain a secure state, when at least one fault is present, by disconnecting the rotor winding from the positive supply terminal and/or by de-exciting the rotor winding. A diagnosis may be carried out using an additional highside switch supplied with power via another activation circuit, and/or a fault detection circuit is provided, whose output signal does not change during a de-excitation.

Activation system and method for operating an electric machine

A drive device for operating an electrical machine has a regulator for driving a rotor winding, which has a highside switch and a de-energization switch. A first terminal of the rotor winding can be connected to a positive supply terminal via the high-side switch, the first terminal of the rotor winding can be connected to a negative supply terminal via a semiconductor component, and a second terminal of the rotor winding can be connected to the negative supply terminal via the de-energization switch. The drive device is arranged to enter a safe state in the presence of at least one fault by disconnecting and/or de-energizing the rotor winding from the positive supply terminal. At least one of the switches is designed to be redundant; and/or the regulator has a plurality of measuring points.

Drive device and method for operating an electrical machine

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Stuttgart, Germany

Murugaperumal Devaraja