Page 33 - PEN Ebook May 2021

Power Supply DESIGN

FLEXIBLE SOLUTION FOR ALL open failure mode and simple installation – with
HIGH-POWER BACK-UP NEEDS SMD and automatic mounting series availa-

In conclusion, choosing the right supercapacitor ble. Supercapacitors also have a wide operating
for the right application is best served through a temperature range, and high reliability in humid Improving EV Fast
structured process that results in the identifica- environments and they are maintenance-free.
tion of the right product. KEMET offers a broad Charger with SiC
range of solutions that can meet the require- In short, these performance characteristics mean
ments of most use-cases. The product range that supercapacitors can provide the perfect Schottky Diodes
is being extended all the time, with the latest solution for any application that needs a reliable
ranges compliant to AEC-Q200 for high-reliability high-power density back-up solution.
automotive applications. By Maurizio Di Paolo Emilio, Editor-in-Chief of Power Electronics News and EEWeb

Ultimately, the benefits of supercapacitors are Nowadays fast charging through DC is getting portional to the switching frequency This article
now well-proven and well-understood. They have more popular. To get faster charge-time it is nec- mainly focuses on the unidirectional power flow
no limits no limit for charge/discharge cycles, essary to have the external power conversion and in the DC-DC section.
with quick charge and discharge possible since it is important that this is galvanically isolated.
no chemical charge is involved. They have an Power electronics should be effective in terms
of cost and should be considerably efficient. ISOLATED DC-DC CONVERTER

SiC Schottky diodes can be selectively used for TOPOLOGY
For More Information
the optimization of power electronics. Battery is This is a unidirectional converter that is isolat-
charged with the help of the isolated DC output ed in nature. Its primary winding is driven with
▶ Kemet whereas the power conversion is not bound and the help of an H-bridge inverter that is single
has the ability of being active or passive with phase. The DC output is generated with the help
the estimated and normal wattage ranges from of the full bridge rectifier and an output filter is
▶ Supercap to the Rescue: Choosing the Right Supercapacitor for Your Application
50-300kW in the presence of 200-600 DC [2]. required for the cleanliness of the DC output,
Presented by Roya Nikjoo, Field Application Engineer, KEMET Power conversion can be both unidirectional and which can either be CL or LC. A DC-DC converter
bidirectional. The size of the transformer is pro- with LC and CL filters is shown in figure 1. Snub-

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