This paper presents a novel grid-connected boost-half-bridge photovoltaic (PV) microinverter system and its control implementations. In order to achieve low cost, easy control, high efficiency, reliability, dc-dc converter using minimal devices is introduced interface the low-voltage PV module. A full-bridge pulsewidth-modulated inverter cascaded injects synchronized sinusoidal current grid. Moreover, plug-in repetitive controller based on fourth-order linear-phase IIR filter proposed...

This paper proposes a bidirectional switched-capacitor dc-dc converter for applications that require high voltage gain. Some of conventional converters have diverse or current stresses the switching devices in circuit, not suitable modular configuration efficiency demand; some suffer from relatively power loss large device count gain, even if stress could be low. By contrast, proposed features low component (switching and capacitor) rating, small count, output capacitance requirement. In...

Remaining useful lifetime prediction and extension of Si power devices have been studied extensively. Silicon carbide (SiC) developed commercialized. Specifically, SiC mosfets utilized for the next generation high-voltage, high-power converters with smaller size higher efficiency, covering various mainstream applications, including photovoltaic systems, electric vehicles, solid-state transformers, more ships airplanes. However, SiC-based different failure modes mechanisms compared...

Multilevel converters and inverters have become the enabling power conversion technology for high voltage applications in today's systems large motor drives. Although neutral-point clamped (NPC, a 3-level) inverter was invented 1979, multilevel concept not formally established until early 1990s when diode-clamped inverter, capacitor-clamped (or flying capacitor) cascade were proposed fully studied. In this paper, we will first focus on research advances developing topologies their system...

This paper presents several nonisolated semi-Z-source inverters for a single-phase photovoltaic (PV) system with low cost and doubly grounded features. These employ the Z-source/quasi-Z-source network only two active switches to achieve same output voltage as traditional voltage-fed full-bridge inverter does. The of are controlled complementarily. Different from inverter, shoot-through zero state is not applicable inverter. input dc source ac share ground, thus leading less leakage ground...

This paper presents a novel synchronous-frame repetitive controller for three-phase UPS inverters. Distinguished from conventional control techniques, the proposed approach minimizes time delay to one-sixth of fundamental period such that dynamic response is significantly improved. In order overcome harmonic distortions under severe load conditions (e.g., unbalanced and nonlinear), in this paper, three synchronous rotating frames are deliberately selected, each which incorporated....

This paper presents a quasi-resonant technique for multilevel modular switched-capacitor dc-dc converter (MMSCC) to achieve zero-current switching (ZCS) without increasing cost and sacrificing reliability. ZCS-MMSCC employs stray inductance distributed in the circuit as resonant inductor resonate with capacitor provide low <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">dv</i> / xmlns:xlink="http://www.w3.org/1999/xlink">dt</i>...

Achieving high efficiency and power density features of intermediate bus converter (IBC) in data center application is very critical. This paper proposes a nonisolated switched-tank dc-dc (STC) to meet the requirement IBC. The proposed STC has fixed voltage conversion ratio. Theoretical analysis provides guideline for designing resonant tank nonresonant as well selecting proper deadtime circuit. With operation feature circuit, zero current switching realized on all devices help...

This paper presents a family of four-quadrant dc-dc converters with minimal number switches and passive devices. These employ Z-source or quasi-Z-source network two active to provide four quadrant operation which means bipolar output voltage bidirectional current operation. Bipolar can also be realized by using one switch diode. They own buck boost characteristics when the duty cycle is changed from zero one. At 0.5 cycle, these either infinity voltage. Experimental results are given...

This paper presents a new zero current switching (ZCS) technique for family of switched-capacitor dc-dc converters. Compared to the traditional ZCS converters by inserting magnetic core in circuit, these employ stray inductance present circuit as resonant inductor and provide soft devices. These do not utilize any additional components minimize loss reduce voltage spike, thus leading high efficiency reliable benefit over Moreover, bulky capacitor bank existing circuits power application...

This paper presents a fixed frequency operating sliding mode (SM) current control method with fast response and improved stability. Different from the conventional SM variable switching frequency, fixed-frequency controller is proposed to modulation index shoot-through duty ratio of voltage-fed quasi-Z-source inverter (qZSI), which will not increase passive components filter design difficulty. A large-signal dynamic model system has been established, can be used for stability in wide range....

The recently proposed current-fed quasi- Z-source inverter (QZSI) can buck and boost voltage provide bidirectional power flow . A crucial criterion for the size of three-phase PWM converters is cooling semiconductors thus determination dissipation at certain operating points. In modified space vector method (SVPWM) control this circuit, different sequences lead to switching loss, current ripple, total harmonic distortion, also spike on devices. order select best sequence obtain performance...

This paper presents an in-series and in-parallel combination power decoupling method for the single-phase inverter. With basic equation derivation, proposed is analyzed compared with other methods in theory. The operating principles control strategy are introduced. circuit parameters based on silicon carbide device designed detail, losses evaluated circuit. To verify theoretical analysis, a PLECS simulation model built. Based results, both can achieve more than 89% reduction of dc-link...

This paper presents a high-efficiency zero-current-switching (ZCS) switched-capacitor (SC) dc-dc converter for high-current high-voltage-gain TEG application. Compared with the traditional hard switching SC circuits, proposed circuit achieves ZCS all switches, thus minimizing loss and electromagnetic interference noise. The huge electrolytic capacitor bank existing in circuit, which is used to reduce voltage ripple achieve high efficiency, eliminated. low-capacitance ceramic utilized...

Magnetic-less multilevel dc-dc converters attract much attention in automotive industry due to their small size, high efficiency, and temperature operation features. A multilevel-modular capacitor-clamped converter (MMCCC) is one of the most promising topologies among them with simple control reduced switch current stress. This paper presents optimal design considerations for an MMCCC achieve highest efficiency smallest size. In order analytical power loss equation should be derived. By...

We demonstrate a novel all-fiber-optic temperature sensor based on reduced graphene oxide (rGO) film coated onto side-polished fiber (SPF). Significantly enhanced interaction between the propagating light and rGO can be obtained via strong evanescent field of SPF. The light–graphene results in sensing with maximum optical power variation 11.3 dB SPF experimentally. has linear correlation coefficient 99.4%, sensitivity 0.134 °C−1, precision better than 0.03 °C, response speed 0.0228 °C s−1....

As the demand of dc-dc converter for medium and high voltage application is increasing in recent years, more attention has been paid to modular multilevel converters (MMC). This paper proposes a novel transformerless MMC achieve high-conversion-ratio DC-DC power conversion purpose. can be used Medium Voltage Direct Current (MVDC) system, as step-up ratio solid-state transformer (SST). The proposed possesses scalability, simplicity well inherent balancing capability. No complex control...

In this paper, a resonant switched-capacitor dc-dc converter is proposed for data center application. The possesses features such as high efficiency, power density and light-weight. Zero current switching (ZCS) can be achieved with the operation, which allows operating under efficiency. Proper device selection in-depth loss analysis on different devices have been performed to support better design of converter. Simulation results are provided in paper validate operation principle A GaN based...

High power density and high-efficiency inverter is required for electric aircraft application due to the restriction of volume weight. In this paper, a prototype 150 kVA using wide bandgap SiC has been developed vertical takeoff landing (eVTOL) application. The thermal properties MOSFET have analyzed corresponding air-cooled heatsink designed tested. gate driver circuit carefully minimize stray inductance ringing voltage mitigated. system tested with 700V input 70A phase current at 20 kHz...