ZVZCS PWM DC-DC converter with energy recovery clamp

A novel zero-voltage zero-current switching full-bridge PWM DC-DC converter with controlled secondary side rectifier is presented in this paper. Zero-voltage turn-on and zero-current turn-off for all power switches of the inverter is achieved for full load range from no-load to short circuit by using turn-off snubber and secondary energy recovery clamp. Modified PWM control strategy is used for the converter. The principle of operation is explained and analysed and simulation results are presented

Vom mehrstimmigen Choral-Satz und Liedmotette zum Generalbaßlied : das Repertoire der handschriftlichen lutherischen Chorbücher des 17. Jahrhunderts aus Oberungarn

The lutheran manuscript Choral Books from the 17th century preserved in the territory of Slovakia contain a lot of simple polyphonic Chants and Hymns, especially with German, but also Latin, Hungarian and Czech texts. Almost all of preserved manuscripts comes from Upper Hungary (contemporary Eastern Slovakia). The repertory of the manuscript sources includes arround 300 polyphonic compositions, mostly German origin. There are ca. 50 compositions from (mostly anonymous) local composers in this sources, from small polyphonic works in the traditional style of choral motet or metrical hymn with cantus firmus in discant to spiritual song with figured bass. This various styles of hymn setting stayed in practice in the lutheran churches of Upper Hungary until the early 18th century

Soft switching DC/DC converter using auxiliary circuits

A novel auxiliary circuit for full-bridge PWMDC/DC converter with controlled secondary side rectifieris presented in this paper. Zero-current turn-on for allpower switches of the inverter is achieved for full loadrange from no-load to short circuit by using controlledrectifier and auxiliary circuit on the secondary side.Modified phase shift PWM control strategy is used for theconverter. The principle of operation is explained andanalyzed and the simulation results are presented

Soft Switching Full-Bridge PWM DC/DC Converter Using Secondary Snubber

A novel full-bridge PWM DC/DCconverter with controlled secondary side rectifier usingsecondary snubber is presented in this paper.Limitation of the circulating current as well as softswitching for all power switches of the inverter isachieved for full load range from no-load to shortcircuit by using controlled rectifier and snubber on thesecondary side. Phase shift PWM control strategy isused for the converter. The principle of operation isexplained and analyzed and the experimental resultson a 1kW, 50 kHz laboratory model of the converterare presented