PFC Converter with Improved Input Current Zero-crossing Distortion

2017 ◽  
Vol 45 (12) ◽  
pp. 1329-1338 ◽  
Author(s):  
Kuo-Ing Hwu ◽  
Wen-Zhuang Jiang
Keyword(s):  
Input Current ◽  
Zero Crossing ◽  
Current Zero

A Self-Powered P-SSHI Interface Circuit with Adaptive On-Resistance Active Diode for PEH

2019 ◽  
Vol 28 (09) ◽  
pp. 1950155
Author(s):  
Lianxi Liu ◽  
Jiangwei Cheng ◽  
Junchao Mu ◽  
Chaojin Huang ◽  
Zhangming Zhu
Keyword(s):  
Output Power ◽  
Input Current ◽  
Detection Accuracy ◽  
Two Stage ◽  
Zero Crossing ◽  
Interface Circuit ◽  
Current Range ◽  
Power Extraction ◽  
Self Powered ◽  
Current Zero

This paper presents a two-stage synchronous rectifier interface circuit for piezoelectric energy harvesting (PEH) system. The proposed rectifier includes a first-stage negative voltage converter, a second-stage adaptive on-resistance active diode, and combines a precise switch-on-time controlled P-SSHI circuit. The traditional active two-stage synchronous rectifier has lower current detection accuracy and hardly achieves high efficiency rectification over a wide input current range. An adaptive on-resistance active diode (AOR active diode) is proposed to replace the traditional active diode to achieve higher current zero-crossing detection accuracy, improve the input current range and the output power of the rectifier. The proposed diode allows the rectifier to maintain high rectification efficiency over a wider input current range. Further, a parallel synchronized switch harvesting on inductor (P-SSHI) with precise switch-on-time controlled circuit is proposed to achieve higher voltage flipping efficiency and improve the power extraction capability of the rectifier. By using the AOR active diode and the P-SSHI with precise switch-on-time controlled circuit, a good performance improvement has been achieved for the proposed interface circuit. The design is fabricated in an SMIC 0.35[Formula: see text][Formula: see text]m standard CMOS technology with a die size of [Formula: see text][Formula: see text]mm2. The simulation results indicate that the proposed circuit achieves more than 80% power converting efficiency and its peak efficiency is 85%. The current zero-crossing detection accuracy of the proposed AOR active diode is less than 10[Formula: see text][Formula: see text]A. The proposed PEH interface circuit extracts up to 2.81 times more output power compared with a traditional rectifier. The voltage flipping efficiency of the P-SSHI circuit is up to 90%, which can effectively improve the power extraction capability of the rectifier. Moreover, the proposed circuit can be self-powered and cold started up.

scholarly journals Analysis to Input Current Zero Crossing Distortion of Bridgeless Rectifier Operating under Different Power Factors

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2447 ◽  
Author(s):  
Jinqi Liu ◽  
Yizhou Liu ◽  
Yuan Zhuang ◽  
Cong Wang
Keyword(s):  
Power Factor ◽  
Harmonic Distortion ◽  
Input Current ◽  
Operating Characteristics ◽  
Unity Power Factor ◽  
Drive Mode ◽  
Zero Crossing ◽  
Piecewise Function ◽  
Simulation And Experiment ◽  
Current Zero

The principles and operating characteristics of bridgeless rectifiers under different power factors are discussed with emphasis on analyzing the input current distortion. Firstly, two driving modes are analyzed and compared. Based on the results of comparison it is concluded that the complementary drive mode is a better choice in terms of reducing the current distortion when bridgeless rectifier operates on non-unity power factor. Then, the mechanism causing input current zero-crossing distortion is analyzed. The input current during the distortion is expressed by the piecewise function when a bridgeless rectifier operates under complementary drive mode. Based on the piecewise function, the harmonic analysis is performed. Besides, the relationships between the input current Total Harmonic Distortion (THD) and the filtering inductance, the input current amplitude and the power factor angle are also investigated, which is useful when designing bridgeless rectifiers and selecting the corresponding parameters. Finally, the accuracy of the theoretical analysis is verified through the simulation and experiment.

Optimized Non-Dead-Time Control of Inverter with Two-Phase Modulated SVPWM

2012 ◽  
Vol 562-564 ◽  
pp. 1531-1536
Author(s):  
Ming Xing Zhu ◽  
Jing Bo Shi
Keyword(s):  
Control Strategy ◽  
Pulse Width Modulation ◽  
Dead Time ◽  
Control Method ◽  
Short Circuit ◽  
Two Phase ◽  
Zero Crossing ◽  
Time Control ◽  
Bus Voltage ◽  
Current Zero

In the inverter control system, two-phase modulated space vector pulse width modulation (SVPWM) algorithm has the advantages of minimum switch loss and higher utilization of direct current (DC) bus voltage. Non-dead-time control strategy can eliminate the problems of the dead time effects. But the traditional non-dead-time control strategy heavily depends on the current zero-crossing detection, which may cause the output voltage distortion or even a short circuit. Based on the analysis of the reason for the distortion, a new optimized non-dead-time control method is proposed. Two methods for the detection of the overlapping area are enumerated. The conclusions are confirmed by the simulation results with MATLAB/ SIMULINK.

Design and Implementation of Actuator Controller for Greenhouse Control System

2014 ◽  
Vol 532 ◽  
pp. 62-69
Author(s):  
Yi Chuan Gao ◽  
Guo Chang Liu
Keyword(s):  
Control System ◽  
Short Circuit ◽  
Alternating Current ◽  
Electric Arc ◽  
Zero Crossing ◽  
Three Phase ◽  
Detection Circuit ◽  
Task Program ◽  
Current Zero ◽  
Greenhouse Control

A novel actuator controller for greenhouse control system is proposed in this paper. This controller can solve the problems existing in traditional greenhouse control system such as generating electric arc, short circuit risk, lack of communication and smart ability. We adopt five separate magnetic latching relays to control the three-phase motor. In order to prevent generating electric arc in the process of turning off relay, the alternating current zero-crossing detection circuit is designed. In software side, the relay-off task program is running in the real-time operating system, which can ensure turn-off operation at the point of alternating current zero-crossing. In addition, the controller is capable of detecting motors operation parameter and having multiple communication interfaces. Finally, we implement our controller in practice and experimental results meet the design requirements.

scholarly journals Optimization and Experimental Study of the Semi-Closed Short-Gap Arc-Extinguishing Chamber Based on a Magnetohydrodynamics Model

Energies ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 3335 ◽  
Author(s):  
Wenbin Jia ◽  
Wenxia Sima ◽  
Tao Yuan ◽  
Ming Yang ◽  
Potao Sun
Keyword(s):  
High Speed ◽  
Basic Structure ◽  
Optimization Method ◽  
Original Structure ◽  
Arc Plasma ◽  
Zero Crossing ◽  
In Series ◽  
Power Frequency ◽  
Motion Characteristics ◽  
Current Zero

The multi-chamber arc-extinguishing structure (MAS), which consists of a lot of semi-closed short-gap arc-extinguishing chambers (SSAC) in series, can be used in parallel gap lightning protection devices to improve the ability to extinguish power frequency follow current. The arc-extinguishing ability of single SSAC directly affects the arc-extinguishing performance of the whole MAS. Therefore, the arc-extinguishing performance of MAS can be improved by optimizing single SSACs. A two-dimensional model of the arc plasma in a SSAC is built based on the magneto-hydrodynamic (MHD) theory. The motion characteristics of an arc in the SSAC are simulated and analyzed. An optimization method of the SSAC structure is proposed. Finally, an impact test platform is built to verify the effectiveness of the optimized SSAC structure. Results show that the short-gap arc forms a high-speed airflow in the SSAC and the arc plasma sprays rapidly to the outlet until the arc is extinguished at its current zero-crossing point. The amplitude of airflow velocity in the optimized structure can be increased to about 8-fold the velocity in the basic structure. Experiments also show that the dissipation time of an arc in the optimized SSAC is 79.2 μs, which is much less than that in the original structure (422.4 μs).

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