- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Low-Voltage, Full-Swing InGaZnO-Based Inverters Enabled by Solution-Processed, Ultra-Thin AlxOy
摘要： High-performance, full-swing inverters implemented with InGaZnO thin-film transistors (TFTs) have been demonstrated capable of operating at a very low voltage. The threshold voltage of the load and drive TFTs were modified through careful change of the gate dielectric anodization voltage. Both the load and drive TFTs show excellent electrical properties including a current on/off ratio > 106 and a subthreshold swing close to the theoretical limit. As a result, the inverters show high voltage gains up to 34 at a supply voltage of only 1 V as well as high noise margins > 92% of the theoretical maximum. The devices and the fabrication process might have potential applications in future wearable and disposable electronics where low cost and low power are vital.
关键词： InGaZnO,one-volt operation,high voltage gain and noise margins,full-swing inverters
更新于2025-11-14 17:28:48
-
Single-Phase Transformer based HF-Isolated Z- Source Inverters with Voltage Clamping Techniques for Solar PV Applications
摘要： In this research article, a new family of impedance source inverters is presented. It employs high frequency electrical isolation between the inverter bridge switches and the load along with voltage clamping across the DC-link voltage. Conventional Z-source inverters (ZSIs) employs an impedance network that consists of inductors and capacitors. It has unique features which realize both step-up/step-down functions and eliminates the need of dead/overlap times. This paper extends this novel concept by using electrical isolation in impedance source inverters. High frequency isolation has many advantages in terms of immunity and reliability; when applied with impedance source inverters this makes ZSIs a preferable choice for industrial applications. In PV systems, the addition of the high frequency transformer provides safety by avoiding the injection of DC circulating current into the grid, without the need of an external bulky line frequency transformer. The gain of the proposed inverter design can be accurately selected by choosing the turns ratio of the HFT or by adjusting the shoot-through duty cycle (STDC) to the inverter. This allows for greater freedom especially when utilizing a higher modulation index, with the STDC allowing dynamic gain adjusts to be done speedily during operation of the inverter. Additionally, a DC-rail voltage clamping technique for the proposed class of isolated ZSIs is also discussed. This technique provides benefits not only in improving the output voltage quality, but also in reducing voltage stress of the active and passive components by minimizing the voltage spikes across the switching devices. In this paper, several high frequency isolated ZSIs are presented, and an example isolated improved ΓZSI design is shown and discussed in detail. Simulations are provided for the proposed class of isolated inverters to verify their working. Further experimental investigation has been done for which results for the isolated improved ΓZSI are reported. These empirical results have largely confirmed the expected benefits that were determined through simulation and accurate model-based testing.
关键词： Single stage power conversion,Higher voltage gain,Impedance source,frequency isolation,High frequency transformers
更新于2025-09-23 15:23:52
-
High Voltage Gain Three Coupled Winding DC-DC Interleaved Boost Converter with Arduino Microcontroller for the PV Panel Control
摘要： In many applications, high-step converters are widely used, including powered vehicles, Photovoltaic (PV) systems, continuous power supplies, Gas lighting and fuel cell systems. The most important requirements in the energy conversion process are reliability, quality, maintenance and size reduction. This paper presents an Interleaved Boost Converter (IBC) to raise voltage gain with three coupled winding. This converter consists of three pairs of coupled inductors to collect energy in parallel and release energy to the series load, which provides a much higher output load voltage than the traditional DC-DC boost converter. To validate the performance, an investigation was introduced by means of steady state analysis and operation. The operation modes and mathematical analysis are presented. Arduino UNO microcontroller was used to implement Pulse Width Modulation (PWM) gate drive based on Maximum Power Point Tracking (MPPT). The DC-DC IBC with High Voltage Gain (HVG) produces low voltage stress across switches, low input and output current ripple, and also improves the efficiency. These features made this converter suitable for applications where a high voltage gain is demanded. This converter was tested using Matlab/Simulink to validate the performance in terms of input and output ripples. The results supported the mathematical analysis. The cancelation of the ripple in input and output voltages has significantly detected. The ripple amplitude is reducing in DC-DC HVG IBC comparing with traditional DC-DC boost converter, and the ripple frequency is doubled. This tends to reduce the output filter losses, and size. Also improves the efficiency of the converter.
关键词： High voltage gain,Current and Voltage sensors,Arduino UNO Microcontroller,Low input and output ripples,Ferrite core,Maximum Power Point Tracking,Interleaved Boost Converter
更新于2025-09-23 15:19:57
-
[IEEE 2018 15th IEEE India Council International Conference (INDICON) - Coimbatore, India (2018.12.16-2018.12.18)] 2018 15th IEEE India Council International Conference (INDICON) - Switched-Inductor Based High Voltage Gain Step-up DC-DC Converter for Photovoltaic Micro-Inverter Application
摘要： Traditional boost converter cannot offer a high voltage gain due to the conduction losses in the ESR of capacitor and DCR of inductor, at higher duty cycles. Therefore, traditional boost converter cannot be employed for voltage conversion in occasions that need very high voltage boosting such as the grid-connected photovoltaic micro- inverter. In this paper, a high voltage gain step-up converter, utilizing a switched-inductor (S-L) cell, is proposed. The input current of the suggested converter is continuous because of the presence inductor at source side that makes the input filter design easier. This converter produces very high output voltage at a lower duty cycle, which makes it suitable for photovoltaic micro-inverter application. The basic operation principles and steady-state analyses of the proposed step-up converter are discussed to derive the voltage gain and voltage/current stresses across each component. The proposed boost converter is finally simulated in MATLAB/Simulink to verify all theoretical analyses.
关键词： high voltage gain,switched-inductor (S-L) cell.,micro-inverter,DC-DC step-up converter
更新于2025-09-19 17:13:59
-
An isolated single-switch high step-up DC/DC converter with three-winding transformer for solar photovoltaic applications
摘要： An isolated single-switch high step-up DC/DC converter for solar photovoltaic applications is presented in this paper. The proposed isolated converter consists of a single switch, two voltage doubler circuits and a three-winding transformer. The four capacitors in the voltage doubler circuits are charged in parallel and are discharged in series by the secondary and tertiary winding of the three-winding transformer to attain a high step-up voltage gain. In addition, the voltage doubler circuits absorb energy in parallel, which, in turn, signi?cantly alleviates the voltage stress on the switch with low turns ratio and low duty cycle. The converter operation principle and steady-state analysis of the isolated high gain converter for continuous conduction mode are presented in detail. Laboratory tests and simulation using MATLAB/Simulink are carried out with a prototype of 80 W converter. The predicted and test results establish a close agreement between the validity of the analysis and the viability of the proposed circuit.
关键词： Voltage doubler circuit,Single-switch isolated converter,Three-winding transformer,High-voltage gain
更新于2025-09-16 10:30:52
-
[IEEE IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society - Lisbon, Portugal (2019.10.14-2019.10.17)] IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society - Coupled-Inductor-Based Differential Boost Inverter with Wide Input Voltage Range for Photovoltaic Generation Applications
摘要： The differential boost inverter has been widely used as a microinverter for the renewable distributed generations as it achieves an ac voltage with amplitude larger than the dc input. However, the unlimited voltage gain of the boost inverter is practically unachievable due to the existence of the parasitic resistance of the input inductor, which narrows the input voltage range and distorts the output voltage waveform as the turn-on duty ratio of the power switches approaches unity. To solve this problem, a novel coupled-inductor-based differential boost inverter is proposed, which uses a two-winding or three-winding coupled inductor to enhanced voltage gain. As a result, the input voltage range of the proposed inverter is significantly widened, facilitating grid-connected applications with a very low dc input voltage, compatible to the outputs of most PV panels. Moreover, the leakage inductance energy of the coupled inductor is recycled with voltages across the power switches clamped to the dc link capacitor by using a lossless diode. A prototype with 30 V dc input, 155 V ac output, nominal power 200 W, was built, which achieves a high voltage-boost, while keeping relatively low voltages stresses on the semiconductor devices.
关键词： coupled-inductor boost inverter,PV generation application,leakage inductance effect,high voltage gain
更新于2025-09-16 10:30:52
-
[IEEE 2019 4th International Conference on Power Electronics and their Applications (ICPEA) - Elazig, Turkey (2019.9.25-2019.9.27)] 2019 4th International Conference on Power Electronics and their Applications (ICPEA) - High voltage gain quasi Z source DC – DC converter contribution to photovoltaic systems
摘要： in this paper, an off-grid solar photovoltaic system based on quasi z source DC-DC converter is presented. In mainly renewable energies the big problem is the low voltage produced; so, the most challenge in photovoltaic system is how to increase the input voltage. The first solution is by associate panels in series, it is the mostly way to augment power and voltage, but it can generate a power loses (connection, shading effect). The second solution is by using a DC-DC boost converter, it is an efficacy technique; except, to obtain a high voltage gain it is necessary to increase the duty cycle; that will be saturate the inductors. An evolutionary power electronics converter may be the best solution, the quasi Z source DC-DC converter make it possible to obtain a high voltage gain with a lower duty cycle (0<D<0.5). The objective of this study is to supply the load by high voltage using one photovoltaic panel and quasi Z source DC-DC converter; for that, the system is modeled and controlled by a perturb & observe algorithm MPPT which can generate the duty cycle D of the converter. The analysis is carried out through simulation in the Matlab? environment, the results obtained clearly depicts the viability and the efficiency of the system.
关键词： Photovoltaic power,voltage gain,MPPT,duty cycle,quasi z source DC-DC converter
更新于2025-09-11 14:15:04