An Improved Cascaded Boost Converter with an Ultra-High Voltage Gain Suitable for Dielectric Quality Tests

Hossein Gholizadeh, Reza Sharifi Shahrivar, Saeed Amini and Tohid Rahimi ()
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Hossein Gholizadeh: School of Electrical and Computer Engineering, University of Tehran, Tehran 1417935840, Iran
Reza Sharifi Shahrivar: Electrical Engineering Faculty, Islamic Azad University, Tehran 1477893855, Iran
Saeed Amini: Electrical Engineering Faculty, Islamic Azad University, Tehran 1477893855, Iran
Tohid Rahimi: Electrical Engineering Faculty, University of New Brunswick, Fredericton, NB E3B 5A3, Canada

Energies, 2024, vol. 17, issue 15, 1-27

Abstract: Dielectric quality tests require a high AC voltage with a frequency range of 0.0001 Hz to 1000 Hz. However, providing a high AC voltage with such a frequency variety is challenging. Providing a high DC voltage and then applying such a voltage to an inverter to adjust the frequency can be an acceptable solution for such a challenge. Notably, a high DC voltage is required for DC tests. This study proposes an improved form of the cascaded boost converter, whose merits are as follows: (i) the high voltage gain providing low duty cycles is possible; (ii) the input current is continuous, which decreases the current ripple of the input filter capacitor; (iii) the current stress of the semiconductors is less than the input current, and most of them have a large difference with it; (iv) the voltage stress of the semiconductors is less than the output voltage with a large difference; (v) only one switch with a simple drive circuit is used; (vi) the common ground of the load and input source decreases the EMI noise; (vii) besides the high voltage gain, the voltage density of the converter based on the number of inductors, capacitors, switches, diodes, and whole components is greater than that of the recently proposed converters; (viii) only two stacked connections of the proposed topology can provide a 2.6 kV voltage for a higher DC voltage test of dielectrics. The functional details of the converter are extracted in ideal and continuous conduction (CCM) modes. Moreover, the converter’s voltage gain and density are compared with the recently proposed converters to show the superiority of the proposed converter. Finally, the experimental results are presented to validate the theoretical relations in a 140 W output power.

Keywords: boost converter; high gain converter; high-voltage test applications; non-isolated DC–DC converters (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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