Press Release 103/2022

New Power Supply with a Lifetime of Up to 50 Years

KIT’s Spinoff ‘Digital Power Systems’ Develops Ultralong-lived Industrial Power Supplies
DPS’s new power supply based on film capacitors reaches a lifetime of up to 50 years and does not need much space. (Photo: Marco Wünschmann, Welectron)
DPS’s new power supply based on film capacitors reaches a lifetime of up to 50 years and does not need much space. (Photo: Marco Wünschmann, Welectron)

Switching power supplies are omnipresent in our daily life, may it be in households, offices, or industry. They convert the alternating current supplied into direct current for smartphones, laptops, charging stations of e-cars, and logistics and computing centers. However, conventional power supplies usually have to be exchanged after nine years of permanent operation. Digital Power Systems (DPS), a spinoff of Karlsruhe Institute of Technology (KIT), has now developed and tested power supplies with a lifetime of 50 years. 

Conventional switching power supplies are light and compact, but highly susceptible to failure due to the electrolyte capacitors they contain. Film capacitors are far more long-lived. So far, however, they have needed up to ten times more space. “We have now developed a digital control process, by means of which film capacitors can be used on smaller space,” DPS Director Michael Heidinger says. Compared to conventional power supplies, maintenance expenditure is much smaller. “This technology is a game changer wherever reliability is important. These may be computing or logistics centers or flight safety lamps.” Work of service staff to replace damaged power supplies costs much more than the device itself, Heidinger adds. 

Lifetime Is Five Times that of Power Supplies with Electrolyte Capacitors

Joint tests with KIT’s Light Technology Institute proved that the new power supplies have a lifetime of 50 years at an ambient temperature of 40 degrees. “This is about five times that of established power supplies,” Heidinger says. So far, no power supply has failed and tests are being continued. “We have not yet reached the limit.”

Digital Control Saves Space

The novel digital control process allows for the use of film capacitors with a slightly increased space requirement only. For control purposes, a microprocessor is integrated in the power supply. It detects disturbing ambient impacts and balances large voltage fluctuations of the film capacitor. As a result, storage capacitors of smaller capacity are sufficient. Heidinger explains that powerful microprocessors have made this possible.

Use in the Air Safety Sector

The power supply is already used for air safety illumination. It is installed in lamps on stacks, wind turbines, or radio masts to warn airplanes. Replacing damaged power supplies there is often tedious and costly, as industrial climbers are needed. 

Further Information:

Being “The Research University in the Helmholtz Association”, KIT creates and imparts knowledge for the society and the environment. It is the objective to make significant contributions to the global challenges in the fields of energy, mobility, and information. For this, about 10,000 employees cooperate in a broad range of disciplines in natural sciences, engineering sciences, economics, and the humanities and social sciences. KIT prepares its 22,800 students for responsible tasks in society, industry, and science by offering research-based study programs. Innovation efforts at KIT build a bridge between important scientific findings and their application for the benefit of society, economic prosperity, and the preservation of our natural basis of life. KIT is one of the German universities of excellence.

mex, 17.11.2022

Margarete Lehné
Chief Press Officer (acting)
Phone: +49 721 608-41105
Fax: +49 721 608-43658
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Contact for this press release:

Dr. Felix Mescoli
Press Officer
Phone: +49 721 608 41171
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