Paper Details

LLC resonant frequency converter is basically a combo of series as well as parallel resonant ckt. For LCCresonant converter it is associated with a disadvantage that, though it has two resonant frequencies, the lower resonantfrequency is in ZCS region[5]. For this application, we are not able to design the converter working at this resonantfrequency. LLC resonant converter existed for a very long time but because of unknown characteristic of this converter itwas used as a series resonant converter with basically a passive (resistive) load. . Here, it was designed to operate inswitching frequency higher than resonant frequency of the series resonant tank of Lr and Cr converter acts very similar toSeries Resonant Converter. The benefit of LLC resonant converter is narrow switching frequency range with light load[6] .Basically, the control ckt plays a very imp. role and hence 555 Timer used here provides a perfect square wave as thecontrol ckt provides no slew rate which makes the square wave really strong and impenetrable. The dead band circuitprovides the exclusive dead band in micro seconds so as to avoid the simultaneous firing of two pairs of IGBT’s where onepair switches off and the other on for a slightest period of time. Hence, the isolator ckt here is associated with each andevery ckt used because it acts as a driver and an isolation to each of the IGBT is provided with one exclusive transformersupply[3]. The IGBT’s are fired using the appropriate signal using the previous boards and hence at last a high frequencyrectifier ckt with a filtering capacitor is used to get an exact dc waveform .The basic goal of this particular analysis is toobserve the wave forms and characteristics of converters with differently positioned passive elements in the form of tankcircuits.

Aakar Mehul Sheth, Prof. Hiren Patel, Prof. Ruchit Soni, “Hardware Analysis of Resonant Frequency Converter Using Isolated Circuits And HF Transformer”, International Journal of Advance Engineering and Research Development (IJAERD), Vol. 2, Issue 8, pp. 86-94, August 2015.