HANNOVER MESSE 2020, 20 - 24 April
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Long-lasting power supply

Modulation method increases operational lifetime.

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Karlsruher Institut für Technologie

Exhibitor details
Exhibitor details
Logo Long-lasting power supply

Product description

Switching power units are used for the power supply of many electrical devices. They convert alternating current into the direct current required by the device. A frequent cause of failure of these technical devices is the failure of the power supply units. These thus limit the service live of the devices or require more frequent service intervals. The electrolytic capacitors used in the power unit are particularly susceptible to faults. They buffer electrical energy and smooth voltage fluctuations over a mains period. Electrolytic capacitors offer a high energy density and are mostly regulated analogously. Film capacitors, on the other hand, would be much more durable. However, due to their lower energy density, these require ten times the installation space for the same capacity. Scientists at KIT have developed a new modulation process for the digital and highly dynamic control of power supply units that enables the use of film capacitors with slightly increased installation space. For the first time, the method allows the output current to be controlled taking into account the DC link voltage and output voltage, whereby frequency and duty factor are possible control variables. The inclusion of these variables makes the control more robust, safer and faster. Deviations can be quickly and precisely adjusted to both input and output voltages, minimizing control inaccuracies. As a result of the longer operational lifetime of the installed film capacitor, the failure rate of the switching power units can be reduced and thus the durability of the terminal devices can be increased many times over. Reduced maintenance effort is particularly useful in places that are difficult to access or with high-quality devices, e.g. electric cars.

You can get an overview of this technology at KIT stand. Detailed information can be exchanged individually in contact with the responsible scientific employees of KIT after the industry fair.

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