Analyzing the Effect of Parasitic Capacitance in a Full-Bridge Class-D Current Source Rectifier on a High Step-Up Push–Pull Multiresonant Converter
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sustainability Article Analyzing the Effect of Parasitic Capacitance in a Full-Bridge Class-D Current Source Rectifier on a High Step-Up Push–Pull Multiresonant Converter Anusak Bilsalam 1,* , Chainarin Ekkaravarodome 2, Viboon Chunkag 3 and Phatiphat Thounthong 4 1 Department of Electrical Engineering Technology, College of Industrial Technology (CIT), King Mongkut’s University of Technology North Bangkok (KMUTNB), 1518 Pracharat 1 Rd., Wongsawang, Bang Sue, Bangkok 10800, Thailand 2 Advanced Power Electronics and Experiment Laboratory, Department of Instrumentation and Electronics Engineering, Faculty of Engineering, King Mongkut’s University of Technology North Bangkok (KMUTNB), 1518 Pracharat 1 Rd., Wongsawang, Bang Sue, Bangkok 10800, Thailand; [email protected] 3 Department Electrical and Computer Engineering, Faculty of Engineering, King Mongkut’s University of Technology North Bangkok (KMUTNB), 1518 Pracharat 1 Rd., Wongsawang, Bang Sue, Bangkok 10800, Thailand; [email protected] 4 Renewable Energy Research Centre, Department of Teacher Training in Electrical Engineering, Faculty of Technical Education, King Mongkut’s University of Technology North Bangkok (KMUTNB), 1518 Pracharat 1 Rd., Wongsawang, Bang Sue, Bangkok 10800, Thailand; [email protected] * Correspondence: [email protected] Abstract: This paper presents an analysis on the effect of a parasitic capacitance full-bridge class-D current source rectifier (FB-CDCSR) on a high step-up push–pull multiresonant converter (HSPPMRC). The proposed converter can provide high voltage for a 12 V battery using an isolated transformer Citation: Bilsalam, A.; DC Ekkaravarodome, C.; Chunkag, V.; and an FB-CDCSR. The main switches of the push–pull and diode full-bridge rectifier can be operated Thounthong, P. Analyzing the Effect under a zero-current switching condition (ZCS). The advantages of this technique are that it uses a of Parasitic Capacitance in a leakage inductance to achieve the ZCS for the power switch, and the leakage inductance and parasitic Full-Bridge Class-D Current Source junction capacitance are used to design the secondary side of the resonant circuit. A prototype Rectifier on a High Step-Up HSPPMRC was built and operated at 200 kHz fixed switching frequency, 340 VDC output voltage, Push–Pull Multiresonant Converter. and 250 W output power. In addition, the efficiency is equal to 96% at maximum load. Analysis of the Sustainability 2021, 13, 5477. https:// effect of the parasitic junction capacitance on the full-bridge rectifier indicates that it has a significant doi.org/10.3390/su13105477 impact on the operating point of the resonant tank and voltage. The proposed circuit design was verified via experimental results, which were found to be in agreement with the theoretical analysis. Academic Editor: Detlef Schulz Keywords: parasitic capacitance; high step-up; zero-current switching; multiresonant; converter; Received: 15 April 2021 current source rectifier Accepted: 6 May 2021 Published: 13 May 2021 Publisher’s Note: MDPI stays neutral 1. Introduction with regard to jurisdictional claims in published maps and institutional affil- Currently, fossil fuel sources are being depleted owing to the considerable increase iations. in the need for energy sources. To overcome this problem, efforts have been invested to develop renewable energy systems in the energy production field. In recent years, high step-up converters have been widely used in distributed power generators based on battery energy storage (BES) and module-integrated converters (MIC) with a DC link, and in stand- alone/grid-connected renewable energy systems such as photovoltaic cells, wind turbines, Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. and fuel cells. These systems, which can be single or hybrid, use energy sources to generate This article is an open access article electricity [1–4]. As these are low-voltage systems, the output voltage can be varied. For distributed under the terms and maintaining system voltage, a battery system is generally used to back-up the system conditions of the Creative Commons with a constant DC-link in the inverter state. Therefore, to increase the low voltage of the Attribution (CC BY) license (https:// battery to a suitable value, a high step-up converter is employed to step-up the low input creativecommons.org/licenses/by/ voltage to a high output voltage. High step-up topologies are classified into nonisolated 4.0/). and isolated DC/DC converters. The nonisolated topology typically uses a boost converter Sustainability 2021, 13, 5477. https://doi.org/10.3390/su13105477 https://www.mdpi.com/journal/sustainability Sustainability 2021, 13, x FOR PEER REVIEW 2 of 20 system with a constant DC-link in the inverter state. Therefore, to increase the low voltage of the battery to a suitable value, a high step-up converter is employed to step-up the low input voltage to a high output voltage. High step-up topologies are classified into noniso- lated and isolated DC/DC converters. The nonisolated topology typically uses a boost con- Sustainability 2021, 13, 5477 verter structure to provide a higher output voltage from low input sources by2 of varying 19 the duty cycle of the pulse width modulation (PWM) [5]. At high voltage/frequency, the con- verter generates a high voltage spike at the power switch and high electromagnetic inter- structure to provide a higher output voltage from low input sources by varying the duty ference increases the switching loss and the loss due to the passive element. A significant cycle of the pulse width modulation (PWM) [5]. At high voltage/frequency, the converter issue generateswith the a boost high voltage converter spike atis thethat power when switch considering and high electromagnetic a low input voltage interference source, it is difficultincreases to obtain the switching a high lossvoltage and the conversion loss due to theratio. passive To overcome element. A significantthis problem, issue the gain conversionwith the ratio boost is converter modified is that to whenmaximize considering the gain a low voltage input voltage using source, several it is difficulttechniques such as interleavedto obtain a positive/negative high voltage conversion coupling; ratio. To cascading, overcome this n-stage problem, cascading, the gain conversion or integrated cas- ratio is modified to maximize the gain voltage using several techniques such as interleaved cading;positive/negative and using multilevel coupling; cells cascading, and switch n-stage capacitors cascading, or [6–17]. integrated The cascading; overall family and of high step-upusing converters multilevel is cells depicted and switch in Figure capacitors 1. [Isolated6–17]. The DC/DC overall familyconverter of high topologies step-up that in- cludeconverters the flyback is depicted and forward in Figure converters1. Isolated are DC/DC considered converter more topologies suitable that for include low-voltage/- powerthe applications flyback and forward because converters these areconverters considered on morely have suitable a forsingle low-voltage/-power switch that results in applications because these converters only have a single switch that results in lower cost lowerand cost significantly and significantly lower circuit lower losses circuit during losses operation. during High-voltage operation. step-up High-voltage techniques step-up techniquesrequire require high-frequency high-frequency transformers. transformers. Family High Step-up Converter [5-17] [19-38] Non-Isolated Isolated Interleaved Technique [6-7] [19-30] [22-23,31-38] Push_Pull Source Coupled Inductor Technique [8-9] Topology Cascade and n-state Technique [10-11] Flyback Topology [19-20] [22-23,31-33,38] [34-37] Switched Capacitor Technique [12-13] Flyback-forword Topology [21] Voltage Fed Current Fed Inductor and Switched Capacitor Technique [14-15] Push-Pull Topology [22-23] Topology and Techniques Topology Three-level Technique [16-17] Class-E Topology [24] Modes Half-Bridge Topology [27-28] ZVS ZCS ZVCS PWM and Resonant Techniques andPWM Resonant Full-Bridge Topology [29-30] [31-32] [35-38] [33-34] Figure 1. FigureFamily 1. ofFamily high of step-up high step-up converters converters and and the the propos proposeded high high step-up step-up push–pull push–pull resonant resonant converter. converter. Asymmetric pattern waveforms have disadvantages such as flux saturation and Asymmetricvoltage/power pattern issues on waveforms the primary have side of disadvan the high-frequencytages such transformer. as flux saturation However, and volt- age/powerthe leakage issues inductance on the atprimary the primary side side of of th thee transformerhigh-frequency can place transformer. high-voltage stressHowever, the leakageon theinductance power switch at the during primary the turn-on side andof the turn-off transformer states [18– can23]. Aplace Class-E high-voltage inverter is a stress on the powertopology switch with the during advantages the turn-on of using a and single turn-o switch,ff a states simple gate[18–23]. driving A circuit, Class-E and inverter all is a its parameters can be calculated. However, the high voltage across the power switch has a topologylimitation with as the it is advantages approximately of three using ranges a single higher switch, than that a of simple the input gate voltage driving [24–26 circuit,]. and all itsTherefore, parameters two switchcan be converters calculated. among However, half-bridge, the push–pull, high voltage and Class-D