Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 97 for “"ZVS"”.
-
Beyond PWM: Active balancing, start-up and ZVS for multi-level converters with applications in renewable energy systems
… Quasi square wave zero voltage switching (ZVS) reduces switching losses and has been demonstrated at specific duty cycles for FCML converters in prior work. Here, we derive the fundamental limitations imposed by the FCML topology and show how the ZVS operating range can be extended through …
-
Zero Voltage Switching (ZVS) Turn-on Triangular Current Mode (TCM) Control for AC/DC and DC/AC Converters
… enable soft switching for devices specifically ZVS turn-on as the turn-off losses of next generation WBG devices are negligible. Thus, the goal of this research is to discover novel switching algorithms for soft turn-on. The state-of the-art control methods namely CRM and TCM achieve soft …
-
Novel concepts in high-frequency resonant power processing
… multiresonant-converter (CF ZVS-MRC) technique and the zero-voltage-switching technique that uses the magnetizing inductance of the power transformer as a resonant element {ZVS {L<sub>M</sub>)) are proposed. analyzed, and evaluated for high-frequency applications. In addition, …
-
Zero-voltage switched resonant and PWM converters: design-oriented analysis and performance evaluation
… is based on the reactive energy required for ZVS. The study considers resonant converters with conventional variable frequency control and with phase-shift control, and the zerovoltage- switched full-bridge PWM converter (ZVS-FB-PWM). Also, a systematic procedure to determine all possible …
-
Design of a high-efficiency, high-performance zero-voltage-switched battery charger-discharger for the NASA EOS space platform
… Bidirectional Battery Charger Discharger (ZVS-BBCD) units into a space power system is shown. A robust design featuring: four interleaved phases, commandable charge rates, overcurrent protection, overvoltage protection, soft starting, reliable gate drive circuitry, high efficiency, and good …
-
Design of high-density dc/dc converters
Zero- Voltage-Switching Multi-Resonant-Converter (ZVS-MRC) techniques are applied with hybrid microelectronics fabrication technologies to design and implement efficient, high-density (>50 W/in³) dc/dc converters. A low-profile high-density power stage of a 25 W dc/dc flyback ZVS-MRC is designed …
-
Load-Independent Class-E Power Conversion
… where the switch enjoys zero-voltage switching (ZVS) and zero-voltage-derivative switching (ZDS). It is also used in MHz dc-dc converters, and in inverters for wireless power transfer, induction heating, and plasma pulsing. The load current in these applications usually varies over a range. …
-
Novel zero-voltage switching techniques for pulse-width-modulated converters
… (PWM) converters, named zero-voltage-switched (ZVS) PWM converters and zero-voltage-transition (ZVT) PWM converters, are proposed. The proposed ZVS-PWM converters combine the merits of conventional PWM and ZVS-QRC techniques. They are capable of regulating the output for a wide load and input …
-
Novel Current-Fed Boundary-Mode Parallel-Resonant Push-Pull Converter
… a novel self-tracking zero-voltage-switching (ZVS) resonant output stage. Traditionally, the inclusion of multiple power processing stages within a power supply topology severely degrades the overall converter efficiency. Due to the inherent high efficiency per stage, however, this effect is …
-
Small-signal analysis of the phase-shifted zero-voltage switched PWM converter
… zero-voltage switched, pulse width modulated (PS-ZVS-PWM) converter and their impact on the converter dynamics are analyzed. The small-signal model is derived incorporating the effects of phase-shift control and the utilization of transformer leakage inductance and power FETs junction capacitances …
-
Soft-switching techniques for pulse-width-modulated converters
… PWM converters: the zero-voltage-switched (ZVS) PWM converters, the zero-current-switched (ZCS) PWM converters, the zerovoltage- transition (ZVT) PWM converters, and the zero-current-transition (ZCT) PWM converters. The family of ZVS- and ZCS-PWM converters are developed to improve the …
-
Analysis and design of a 500 kHz series resonant inverter for induction heating applications
… the evaluation of the zero-voltage switching (ZVS) condition and the determination of the ZVS operating region. Based upon this analysis a frequency control strategy that minimizes circulating energies is proposed. Also, a methodology to design the power stage components, and to predict the …
-
High-frequency multi-resonant power conversion techniques
… Zero-voltage-switched multi-resonant converters (ZVS-MRCs) are proposed for high-frequency power conversion applications. ZVS-MRCs use a resonant network with one resonant inductor and two resonant capacitors. The resonant inductor is in series with the leakage inductance of the power transformer. …
-
Soft Switching Control and Loss Analysis for High Frequency Power Converters
… Current Mode (TCM) with zero-voltage-switching (ZVS) turn-ON but varying switching frequency. Based on this discussion, the limitation of existing soft-switching technology has been revealed and it was identified that a new solution suitable for high-power applications but with constant switching …
-
Two-Stage Multi-Channel LED Driver with CLL Resonant Converter
… to help the primary-side switches to achieve ZVS. Therefore, large magnetizing inductance is good for current balance and properly designed Lr1 is helpful for ZVS achievement. These properties of MC3 CLL are preferred to drive multi-channel LED strings. In the design procedure of MC3 CLL …
-
Compact and efficient power electronics with applications to solar PV, automotive, and aerospace systems
… quasi-square-wave (QSW) zero-voltage switching (ZVS). ZVS minimizes switching losses and enables high-frequency operation of the converter. The flexible nature of the board enables the converter to be integrated to non-flat surfaces such as motors, pipes, or airfoils. Another such application is …
-
Active-clamp PWM converters: design-oriented analysis and small-signal characterization
… recovery of the magnetic leakage energy, ZVS for all switches, and minimum voltage stresses on switches. Therefore, it allows a reliable high switching frequency operation without a significant increase of the switching losses. This makes the ACL Weinberg converter a prime candidate for …
-
Optimization of spacecraft battery charger/discharger systems
… is provided. A novel zero-voltage-switching (ZVS) bidirectional converter topology is presented. A bidirectional battery charger / discharger has several advantages, including a potentially substantial system weight savings. However, it is shown that most of the advantages can not be realized …
-
High Frequency, High Current Integrated Magnetics Design and Analysis
… studied in this work is the 12V non-isolated ZVS self-driven presented in [1]. This scheme offered an increased efficiency over the state of the art industry design and also increased the switching frequency for capacitor reduction. The goal of this research was to study this topology and …
-
Novel DC/DC Converters For High-Power Distributed Power Systems
… for the main devices. Zero-voltage switching (ZVS) and zero-voltage and zero-current switching (ZVZCS) soft-switching techniques are studied, analyzed and compared in order to improve the characteristics of the proposed converter. This results in a series of ZVS and ZVZCS three-level DC/DC …
Page 1 of 5