Page 10 - PEN eBook March 2023

Power Supplies AUTOMOTIVE

be eliminated altogether and results in a very small increase in the power dissipated in switching,
which is completely acceptable and insignificant.

CONCLUSION

Experimental results show that, with this dual-frequency methodology, the conversion efficiency
improves by at least 6% to 7%. By performing a good analysis and design, the circuits behave as
planned, achieving their intended goals. It is interesting to compare the voltage waveforms at the
ends of the MOSFET and diode, at the two switching frequencies, to verify the efficiency of the
system. It is useful, too, to analyze the currents transiting the LINV and LREC inductors.

The oscillograms in Figure 4 show, respectively, the activation pulse of the electronic switch and its
two signals at the ends of the two semiconductor components (the first two oscillograms above) at

the base frequency. The other two oscillograms (bottom) show, respectively, the activation pulse of
the electronic switch and its two signals at the ends of the two semiconductor components, at the
double frequency. The second mode of operation uses twice the frequency and half the current on
the load. These results, at such high frequencies, could not normally be achieved with conventional
solutions.
Overview of AC/DC
Class DC/DC converters are extremely complex and critical, but they provide enormous benefits

by allowing loads of varying nature and impedance to be driven. With special arrangements and
substantial circuit modifications, and with an exponential increase in system complexity, a DC/DC Converters for
converter can also be implemented for three types of loads.
Fast-Charging Stations

By Saumitra Jagdale, contributing writer for Power Electronics News

Electric vehicles constitute a major segment of the promising technologies for achieving a

sustainable transport sector in the future. AC/DC converters are the backbone components for
expanding and improving
the functioning of EVs. This
article gives an overview
of AC/DC converters,
types of charging stations,
problems faced with

conventional two-level
(2L) AC/DC converters
and the significance of
using multilevel converters
(MLCs).
Figure 4: The graphs of the signals at the two operating frequencies Figure 1: AC/DC charger illustration (Source: IES Synergy)

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