Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

noCap - AC Operable Class-D Amplifier

11.02.2011
Related Art - Basically a Class D power amplifier compares an input voltage with a saw tooth reference. The comparison yields a pulse series with a duty cycle proportional to the present input voltage. A pair of solid state switches (e. g. MOSFETs, IGBTs) is driven by the pulse signals; the output of the power stage commonly is low pass filtered in order to eliminate the high frequency parts of the signal due to the reference.

The solid state switches are energized by a power supply comprising capacitors. A persistent challenge is the rating of these power supply capacitors: Especially for low frequency output signals down to DC the flyback energy due to the inductive components of low pass filter and load can charge the power supply capacitors up to voltages much greater than specified. To overcome rating problems the power supply capacitors are sometimes shunted by zener diodes. However, besides the additional circuitry efforts this measure causes additional heat losses. Thus, a more consequent solution would be desirable. Invention - Such a solution was recently developed at the Faculty of Process Engineering, Energy and Mechanical Systems at Cologne University of Applied Sciences. The innovative noCap technology not longer relies on power supply capacitors. The output stage switches moreover are immediately energized by an AC supply. With its novel power stage control method noCap maintains the outstanding power efficiency known from other Class-D designs.

Beyond that there is neither a need for commonly utilized power supply capacitors, nor for a separate power supply at all: noCap quasi comprises its own switching power supply. Therefore a considerable gain in circuit package density can be achieved.

Further Information: PDF

PROvendis GmbH
Phone: +49 (0)208/94105 10

Contact
Dipl.-Ing. Alfred Schillert

info@technologieallianz.de | TechnologieAllianz e.V.
Further information:
http://www.technologieallianz.de/angebote.php?sort=sag&id=2261&lang=en
http://www.technologieallianz.de

More articles from Technology Offerings:

nachricht New Lithium Salts of Pentafluorophenylamide Anions as Electrolytes in Lithium Ionic Batteries
18.04.2017 | TechnologieAllianz e.V.

nachricht Gratings on glass surfaces
28.03.2017 | TechnologieAllianz e.V.

All articles from Technology Offerings >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Physicists Design Ultrafocused Pulses

Physicists working with researcher Oriol Romero-Isart devised a new simple scheme to theoretically generate arbitrarily short and focused electromagnetic fields. This new tool could be used for precise sensing and in microscopy.

Microwaves, heat radiation, light and X-radiation are examples for electromagnetic waves. Many applications require to focus the electromagnetic fields to...

Im Focus: Carbon Nanotubes Turn Electrical Current into Light-emitting Quasi-particles

Strong light-matter coupling in these semiconducting tubes may hold the key to electrically pumped lasers

Light-matter quasi-particles can be generated electrically in semiconducting carbon nanotubes. Material scientists and physicists from Heidelberg University...

Im Focus: Flexible proximity sensor creates smart surfaces

Fraunhofer IPA has developed a proximity sensor made from silicone and carbon nanotubes (CNT) which detects objects and determines their position. The materials and printing process used mean that the sensor is extremely flexible, economical and can be used for large surfaces. Industry and research partners can use and further develop this innovation straight away.

At first glance, the proximity sensor appears to be nothing special: a thin, elastic layer of silicone onto which black square surfaces are printed, but these...

Im Focus: 3-D scanning with water

3-D shape acquisition using water displacement as the shape sensor for the reconstruction of complex objects

A global team of computer scientists and engineers have developed an innovative technique that more completely reconstructs challenging 3D objects. An ancient...

Im Focus: Manipulating Electron Spins Without Loss of Information

Physicists have developed a new technique that uses electrical voltages to control the electron spin on a chip. The newly-developed method provides protection from spin decay, meaning that the contained information can be maintained and transmitted over comparatively large distances, as has been demonstrated by a team from the University of Basel’s Department of Physics and the Swiss Nanoscience Institute. The results have been published in Physical Review X.

For several years, researchers have been trying to use the spin of an electron to store and transmit information. The spin of each electron is always coupled...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Clash of Realities 2017: Registration now open. International Conference at TH Köln

26.07.2017 | Event News

Closing the Sustainability Circle: Protection of Food with Biobased Materials

21.07.2017 | Event News

»We are bringing Additive Manufacturing to SMEs«

19.07.2017 | Event News

 
Latest News

Programming cells with computer-like logic

27.07.2017 | Life Sciences

Identified the component that allows a lethal bacteria to spread resistance to antibiotics

27.07.2017 | Life Sciences

Malaria Already Endemic in the Mediterranean by the Roman Period

27.07.2017 | Health and Medicine

VideoLinks
B2B-VideoLinks
More VideoLinks >>>