scholarly journals A High-Precision Control for a ZVT PWM Soft-Switching Inverter to Eliminate the Dead-Time Effect

Energies ◽  
2016 ◽  
Vol 9 (8) ◽  
pp. 579 ◽  
Author(s):  
Baoquan Kou ◽  
Hailin Zhang ◽  
He Zhang
Keyword(s):  
High Precision ◽  
Dead Time ◽  
Time Effect ◽  
Soft Switching ◽  
Precision Control ◽  
The Dead

scholarly journals Dead-Time Correction Applied for Extended Flux-Based Sensorless Control of Assisted PMSMs in Electric Vehicles

Electronics ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 220
Author(s):  
Cheng Lin ◽  
Jilei Xing ◽  
Xingming Zhuang
Keyword(s):  
Control System ◽  
Electric Vehicles ◽  
Dead Time ◽  
Sensorless Control ◽  
Correction Method ◽  
Time Effect ◽  
Dead Time Correction ◽  
Speed Range ◽  
Time Correction ◽  
The Dead

Sensorless control technology of PMSMs is of great importance for safety and reliability in electric vehicles. Among all existing methods, only the extended flux-based method has great performance over all speed range. However, the accuracy and reliability of the extended flux rotor position observer are greatly affected by the dead-time effect. In this paper, the extended flux-based observer is adopted to develop a sensorless control system. The influence of dead-time effect on the observer is analyzed and a dead-time correction method is specially designed to guarantee the reliability of the whole control system. A comparison of estimation precision among the extended flux-based method, the electromotive force (EMF)-based method and the high frequency signal injection method is given by simulations. The performance of the proposed sensorless control system is verified by experiments. The experimental results show that the proposed extended flux-based sensorless control system with dead-time correction has satisfactory performance over full speed range in both loaded and non-loaded situations. The estimation error of rotor speed is within 4% in all working conditions. The dead-time correction method improves the reliability of the control system effectively.

scholarly journals Analysis and Elimination of Dead-Time Effect in Wireless Power Transfer System

Energies ◽  
2018 ◽  
Vol 11 (6) ◽  
pp. 1577 ◽  
Author(s):  
Xin Liu ◽  
Tianfeng Wang ◽  
Nan Jin ◽  
Salman Habib ◽  
Muhammad Ali ◽  
...  
Keyword(s):  
High Frequency ◽  
Dead Time ◽  
Short Circuit ◽  
Wireless Power Transfer ◽  
Time Effect ◽  
Voltage Source ◽  
Power Transfer ◽  
Wireless Power ◽  
Voltage Distortion ◽  
The Dead

Dead time between the complementary driving signals is needed to avoid short circuit in voltage source inverters (VSIs), however, this raises issues such as voltage distortion and harmonic generation. In wireless power transfer (WPT) systems, the ratio of dead time versus operating period becomes more problematic due to the high frequency, where the dead time can cause serious concerns regarding the phase errors and control performance deterioration. Therefore, this paper presents a comprehensive analysis of the dead-time effect for WPT systems based on a series–series (SS) topology. Firstly, it is found that voltage distortion appears in two regions in comparison with the three in one active bridge WPT system, and seven regions, as compared to the eight in dual active bridge (DAB) WPT system. Afterwards, a novel pulse width modulation (PWM) method is proposed, where the driving signals of the same phase leg are no longer complementary to each other. By employing the proposed method, the dead-time effect can be addressed up to a certain extent, and the desired voltage can be obtained in all the regions. In addition, the proposed method is not influenced by the system parameters, and can be easily applied to other high-frequency resonant converters. Simulated and experimental results are added to verify the feasibility and efficacy of the proposed control scheme.

scholarly journals Modeling and Compensation for Dead-Time Effect in High Power IGBT/IGCT Converters with SHE-PWM Modulation

Energies ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 4348 ◽  
Author(s):  
Jingling Cheng ◽  
Dongdong Chen ◽  
Guozhu Chen
Keyword(s):  
High Power ◽  
Pulse Width Modulation ◽  
Power Converters ◽  
Dead Time ◽  
Open Loop ◽  
Time Effect ◽  
Operating Conditions ◽  
Switching Frequency ◽  
Harmonic Elimination ◽  
The Dead

Research on applying selective harmonic elimination pulse width modulation (SHE-PWM) to high power converters has drawn tremendous interest, due to the advantages of low switching frequency and high output harmonic performance. In the fields of high power converters such as variable speed traction motor drives and static synchronous compensators (STATCOM), the adoption of high voltage but slow speed semiconductor devices, i.e., IGBT/IGCT, results in a longer dead time of several microseconds, which leads to a motor vibration in the former case or the distortion of grid current in the latter case. This paper analyzes in detail the mechanism of the dead-time effect on 3-level SHE-PWM with different operating conditions considered. For the first time, a general mathematical model describing the relationship between the dead time and harmonic distribution of SHE-PWM wave is established. Based on which an open-loop compensation method by inserting a margin time into the effective switching angles is proposed. Furthermore, a closed-loop controller that implements online adaptive adjustment of the margin time is designed in case of a variable frequency application. The effectiveness of the proposed method in different scenarios is verified through simulation results.

scholarly journals Control Strategies of Mitigating Dead-time Effect on Power Converters: An Overview

Electronics ◽  
2019 ◽  
Vol 8 (2) ◽  
pp. 196 ◽  
Author(s):  
Yi Ji ◽  
Yong Yang ◽  
Jiale Zhou ◽  
Hao Ding ◽  
Xiaoqiang Guo ◽  
...  
Keyword(s):  
Power Converters ◽  
Dead Time ◽  
Control Strategies ◽  
Time Effect ◽  
Voltage Source ◽  
Voltage Source Converters ◽  
Negative Effects ◽  
Advantages And Disadvantages ◽  
The Dead ◽  
Dead Time Compensation

To prevent short-circuits between the upper and lower switches of power converters from over-current protection, the dead time is mandatory in the switching gating signal for voltage source converters. However, this results in many negative effects on system operations, such as output voltage and current distortions (e.g., increased level of fifth and seventh harmonics), zero-current-clamping phenomenon, and output fundamental-frequency voltage reduction. Many solutions have been presented to cope with this problem. First, the dead-time effect is analyzed by taking into account factors such as the zero-clamping phenomenon, voltage drops on diodes and transistors, and the parameters of inverter loads, as well as the parasitic nature of semiconductor switches. Second, the state-of-the-art dead-time compensation algorithms are presented in this paper. Third, the advantages and disadvantages of existing algorithms are discussed, together with the future trends of dead-time compensation algorithms. This article provides a complete scenario of dead-time compensation with control strategies for voltage source converters for researchers to identify suitable solutions based on demand and application.

scholarly journals Design of Digital Control System for DC/DC Converter of On-Board Charger

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Haijun Tao ◽  
Guopeng Zhang ◽  
Zheng Zheng ◽  
Changshun Du
Keyword(s):  
Power Supply ◽  
Power Efficiency ◽  
Dead Time ◽  
Dynamic Performance ◽  
Soft Switching ◽  
Current Phase ◽  
Voltage Oscillation ◽  
Wide Range ◽  
Subharmonic Oscillation ◽  
The Dead

Vehicle charging power supply is widely used because of its small size and portability. Aiming at the problems of slow dynamic response, subharmonic, oscillation and limited soft-switching range of phase-shifted full-bridge DC/DC converter, the paper proposed a modified PSFB converter by introducing clamp diodes at the primary side of the transformer to suppress voltage oscillation of the transformer’s secondary side. Also, digital peak current phase-shifting control and slope compensation are introduced to avoid subharmonic oscillation. Dynamic dead-time control technology introduced adjust the dead-time in different load ranges through the dead-time adjustment subroutine. Finally, an experimental platform of on-board charging phase-shifted full-bridge DC/DC converter is established. The experimental results show that the power supply eliminates subharmonic oscillation, achieves a wide range of soft-switching, improves the dynamic performance and antiinterference ability of the system, and optimizes the power efficiency.

Setting Program of Dead Time with No Dead-Time Effect Based on Single-Cycle Control

2012 ◽  
Vol 588-589 ◽  
pp. 1569-1572
Author(s):  
Xiang Lu ◽  
Jin Ma ◽  
Gang Hao
Keyword(s):  
Electric Power ◽  
Dead Time ◽  
Control Method ◽  
Time Effect ◽  
Single Cycle ◽  
Three Phase ◽  
The Dead

Based on the studies of the problems occurred in using single-cycle control method to eliminate the electric Power Harmonic, this article proposes a new kind of general dead-time setting method with no dead-time effect and testify the effect of single-cycle controlled three-phase APF, for the problem of the dead-time in bridge inverter.

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