@article{akhmetov_pratik_pantic_2023, title={Accuracy Analysis of the LCR Meter-Based Method for C-V Characterization of a Capacitor}, ISSN={["1048-2334"]}, DOI={10.1109/APEC43580.2023.10131396}, abstractNote={The capacitance-voltage (C-V) characterization of capacitors and power semiconductor devices (MOSFETs and diodes) is crucial for circuit analysis and loss modeling. This paper discusses an LCR meter-based capacitive coupling method for C-V characterization. It requires an LCR meter and a few inexpensive passive components. However, the unaccounted effects of the parameters, such as blocking capacitance, filtering inductance, parasitic inductance, or power supply impedance can significantly affect the accuracy of the measuring circuit. In this paper, these effects are analyzed, and the expected error is described analytically. Thus, the measuring circuit can be designed using the derived formulas to achieve the targeted accuracy and frequency range. The measuring circuit with the measuring range of 10 kHz-1 MHz with less than 1% error was designed using the derived analytical equations and validated experimentally.}, journal={2023 IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION, APEC}, author={Akhmetov, Zhansen and Pratik, Ujjwal and Pantic, Zeljko}, year={2023}, pages={2481–2488} }
 @article{akhmetov_abdelraziq_pantic_2023, title={Low Conducted-EMI Single-Phase Boost PFC with Sliding Frequency Modulation}, ISSN={["1048-2334"]}, DOI={10.1109/APEC43580.2023.10131650}, abstractNote={A boost Power Factor Correction (PFC) circuit is connected between the AC grid and converters to meet Electromagnetic Interference (EMI) and Total Harmonic Distortion (THD) standards. An EMI filter should be utilized at the input of the PFC to attenuate high-frequency noise injected into the grid. This article discusses the low-conducted EM emission boost PFC with Sliding Frequency Modulation (SFM) proposed by Power Integrations. The proposed boost PFC is compared with a conventional boost PFC operated using Constant Frequency Modulation (CFM) at 120 kHz. Both PFCs are rated for the same nominal power (i.e., 300 W) and output voltage (i.e., 383 V). An analytical loss model is also developed to compare the performance of the SFM and CFM PFCs. The analytical findings are verified by means of simulations and experiments.}, journal={2023 IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION, APEC}, author={Akhmetov, Zhansen and Abdelraziq, Muhammad and Pantic, Zeljko}, year={2023}, pages={1784–1789} }
 @article{pratik_abdelraziq_ahluwalia_akhmetov_chenevert_pantic_2021, title={Design of a Dual-Loop Controller with Two Voltage- Dependent Current Compensators for an LLC-Based Charger}, ISSN={["1093-5142"]}, DOI={10.1109/COMPEL52922.2021.9645959}, abstractNote={A two-stage charger (PFC+LLC) is developed for Power Mobility Device (PMD) charging applications (i.e., power wheelchairs). The LLC topology is selected due to its ability to maintain ZVS operation over a wide range of load variations. This paper discusses the challenges of designing a dual-loop controller for an LLC-based charger with a wide operation region. It proposes modifying the inner current loop to maintain stable operation over a wide input and output range—the proposed internal loop control switches intelligently between two current controllers based on the output voltage level. A 300-W prototype is designed and tested with a resistive load. Moreover, simulation and experimental results are compared to validate the robustness and stability of the proposed controller.}, journal={2021 IEEE 22ND WORKSHOP ON CONTROL AND MODELLING OF POWER ELECTRONICS (COMPEL)}, author={Pratik, Ujjwal and Abdelraziq, Muhammad and Ahluwalia, Urvi and Akhmetov, Zhansen and Chenevert, Gabriel and Pantic, Zeljko}, year={2021} }