scholarly journals Power Device Temperature-Balancing Control Method for a Phase-Shift Full-Bridge Converter

Energies ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1623
Author(s):  
Jun-Mo Kim ◽  
Jeong Lee ◽  
Kyung Ryu ◽  
Chung-Yuen Won
Keyword(s):  
Phase Shift ◽  
High Efficiency ◽  
Control Method ◽  
Balance Control ◽  
Load Condition ◽  
Power Device ◽  
Maximum Temperature ◽  
Temperature Deviation ◽  
Light Load ◽  
Switching Method

In this paper, a switching method is proposed for power device temperature-balancing in a phase-shift full-bridge (PSFB) converter. PSFB is commonly used for applications that require high efficiency, because a zero-voltage switching (ZVS) operation is possible on the primary-side. In PSFB, the circulation current complicates ZVS under a light-load condition, which generates heat. Meanwhile, the heat generated in PSFB creates a temperature deviation between the lagging leg and the leading leg, which shortens the lifetime of the power device, thereby reducing system reliability and efficiency. To solve this problem, previous studies applied a pulse-width modulation (PWM) switching method for light and medium loads, and a phase-shift switching method for the region where ZVS is possible. Although this method has the advantage of easy control, the maximum temperature of the legs of the PSFB increases with medium loads. In this paper, a temperature-balancing algorithm—a temperature-balance control—is proposed to decrease the leg temperature using switching based on position exchanges of the leading leg and lagging leg along with PWM switching. Temperature-balance control minimizes leg temperature deviation under light load conditions. The proposed control method provides a minimum temperature difference between the two legs and high efficiency.

scholarly journals An Interleaved Phase-Shift Full-Bridge Converter with Dynamic Dead Time Control for Server Power Applications

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 853
Author(s):  
Jia-You Lee ◽  
Jheng-Hung Chen ◽  
Kuo-Yuan Lo
Keyword(s):  
Phase Shift ◽  
High Efficiency ◽  
Dead Time ◽  
Load Condition ◽  
Power Converter ◽  
Switching Loss ◽  
Time Control ◽  
Light Load ◽  
Wide Range ◽  
Voltage Spike

A compact and high-efficiency power converter is the main business of today’s power industry for server power applications. To achieve high efficiency with a low-output ripple, an interleaved phase-shift full-bridge (PSFB) converter is designed, built, and tested for server power applications in this study. In this paper, dynamic dead time control is proposed to reduce the switching loss in the light load condition. The proposed technique reduces the turn-off switching loss and allows a wide range of zero-voltage switching. Moreover, the current ripple of the output inductor can be reduced with the interleaved operation. To verify the theoretical analysis, the proposed PSFB converter is simulated, and a 3 kW prototype is constructed. The experimental results confirm that the conversion efficiency is as high as 97.2% at the rated power of 3 kW and 92.95% at the light load of 300 W. The experimental transient waveforms demonstrated that the voltage spike or drop is less than 2 V in the fast-fluctuating load conditions from 0% load to 60% load and 40% load to 100% load.

scholarly journals Application of Thermal Balance Phase-Shift Control Strategy to Dual-Active-Bridge DC-DC Converter

2018 ◽  
Vol 36 (6) ◽  
pp. 1129-1138
Author(s):  
Tao Lei ◽  
Zicun Lin ◽  
Xiaobin Zhang ◽  
Longchun Li
Keyword(s):  
Phase Shift ◽  
Control Strategy ◽  
Thermal Balance ◽  
Control Mode ◽  
Power Device ◽  
Dual Active Bridge ◽  
Shift Control ◽  
Light Load ◽  
Operational Life ◽  
Bidirectional Power Flow

With the development of the more/All electrical aircraft technology, the dual active bridge converter has been applied to the energy storage device to realize the bidirectional power flow in aircraft electrical system. The power loss of power device in DAB converter affects the operational life of the device and the reliability of the converter. So it is an important performance index to keep the temperature balance for power device in DAB converter. In this paper, the operational mode of dual active bridge bidirectional DC-DC converter in extended-phase-shift (EPS) control is analyzed and verified by experiment, find the reasons for difficult to achieve soft-switching under light load conditions, then proposes a novel thermal balance phase-shift control strategy on the basis of EPS. Experimental methods in this paper are alternation control mode and temperature feedback control mode. The thermal image and temperature was analyzed. The efficiency curve was plotted. The switching waveform was observed. the thermal balance was achieved to verify the effectiveness. and finally achieves the goal for improving the converter efficiency, reduces the devices heat stress, improves the reliability of the DAB converters and increases device lifetime.

scholarly journals Research on Control Method of Neutral Point Potential Balance of T-Type Three-level Inverter Based on PLECS

2021 ◽  
Vol 2087 (1) ◽  
pp. 012051
Author(s):  
ZhuoQun Liu ◽  
JunChi Ma ◽  
KaiXu Liu
Keyword(s):  
Electromagnetic Interference ◽  
High Efficiency ◽  
Reactive Power ◽  
Control Method ◽  
Balance Control ◽  
Neutral Point ◽  
Voltage Source ◽  
Point Potential ◽  
Capacitor Voltage ◽  
Inverter Topology

Abstract The T-type three-level inverter topology has the advantages of low electromagnetic interference, high efficiency, and low output harmonic content. This article combines constant power inverter, independent control of active and reactive power output, Analyzed and studied the neutral point potential balance control of the T-type three-level inverter topology. Through PI adjustment control on the amount of charge of the capacitor, the midpoint voltage of the capacitor is always maintained in a balanced state, and the fluctuation of the midpoint voltage is controlled within ±0.23%. This method can effectively avoid the influence of the difference of capacitance parameters on the DC side on the midpoint voltage. The PLECS software simulation verifies the reliability of the capacitor voltage equalization circuit under the condition of the voltage imbalance at the midpoint of the DC side voltage source supply capacitor voltage equalization.

A Coordinated Voltage Control Scheme for Distribution Network with Renewable Sources

2015 ◽  
Vol 781 ◽  
pp. 393-396
Author(s):  
Worawat Nakawiro
Keyword(s):  
Optimal Power Flow ◽  
Control Method ◽  
Renewable Energy Sources ◽  
Distribution Network ◽  
Load Condition ◽  
Voltage Control ◽  
Distribution Networks ◽  
Simulation Software ◽  
Mixed Integer ◽  
Light Load

With significant penetration of renewable energy sources in distribution networks, the voltage control method may have to be revised especially during the light load condition. This paper presents a coordinated voltage control strategy to address this issue. A mixed-integer nonlinear optimal power flow was formulated and solved by Particle Swarm Optimization (PSO). All system constraints and operating limits are considered. The code was written using DigSILENT programming language (DPL) and implemented inside DigSILENT power factory simulation software. The proposed method can minimize generation curtailment to prevent overvoltage at any buses. A realistic distribution network was adopted to demonstrate the systems’ effectiveness. Simulation results show that all security constraints are maintained within operating limit. Power losses at the same time are minimized in comparison to the losses using the classical control method.

scholarly journals Evaluation of a Three-Phase Bidirectional Isolated DC-DC Converter with Varying Transformer Configurations Using Phase-Shift Modulation and Burst-Mode Switching

Energies ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2836
Author(s):  
Nuraina Syahira Mohd Sharifuddin ◽  
Nadia M. L. Tan ◽  
Hirofumi Akagi
Keyword(s):  
Phase Shift ◽  
Voltage Drop ◽  
Load Condition ◽  
Mode Switching ◽  
Power Transfer ◽  
Burst Mode ◽  
Light Load ◽  
Three Phase ◽  
Efficiency Performance ◽  
Intermittent Switching

This paper presents the performance of a three-phase bidirectional isolated DC-DC converter (3P-BIDC) in wye-wye (Yy), wye-delta (Yd), delta-wye (Dy), and delta-delta (Dd) transformer configurations, using enhanced switching strategy that combines phase-shift modulation and burst-mode switching. A simulation verification using PSCAD is carried out to study the feasibility and compare the efficiency performance of the 3P-BIDC with each transformer configuration, using intermittent switching, which combines the conventional phase-shift modulation (PSM) and burst-mode switching, in the light load condition. The model is tested with continuous switching that employs the conventional PSM from medium to high loads (greater than 0.3 p.u.) and with intermittent switching at light load (less than 0.3 p.u), in different transformer configurations. In all tests, the DC-link voltages are equal to the transformer turns ratio of 1:1. This paper also presents the power loss estimation in continuous and intermittent switching to verify the modelled losses in the 3P-BIDC in the Yy transformer configuration. The 3P-BIDC is modelled by taking into account the effects that on-state voltage drop in the insulated-gate bipolar transistor (IGBTs) and diodes, snubber capacitors, and three-phase transformer copper winding resistances will have on the conduction and switching losses, and copper losses in the 3P-BIDC. The intermitting switching improves the efficiency of the DC-DC converter with Yy, Yd, Dy, and Dd connections in light-load operation. The 3P-BIDC has the best efficiency performance using Yy and Dd transformer configurations for all power transfer conditions in continuous and intermittent switching. Moreover, the highest efficiency of 99.6% is achieved at the light power transfer of 0.29 p.u. in Yy and Dd transformer configurations. However, the theoretical current stress in the 3P-BIDC with a Dd transformer configuration is high. Operation of the converter with Dy transformer configuration is less favorable due to the efficiency achievements of lower than 95%, despite burst-mode switching being applied.

scholarly journals Comparison between Phase-Shift Full-Bridge Converters with Noncoupled and Coupled Current-Doubler Rectifier

2013 ◽  
Vol 2013 ◽  
pp. 1-11
Author(s):  
Cheng-Tao Tsai ◽  
Jye-Chau Su ◽  
Sheng-Yu Tseng
Keyword(s):  
Phase Shift ◽  
High Efficiency ◽  
Load Condition ◽  
Duty Ratio ◽  
The Common ◽  
Step Down ◽  
Efficiency Comparison ◽  
Voltage Conversion ◽  
Study Performance ◽  
Current Ripple

This paper presents comparison between phase-shift full-bridge converters with noncoupled and coupled current-doubler rectifier. In high current capability and high step-down voltage conversion, a phase-shift full-bridge converter with a conventional current-doubler rectifier has the common limitations of extremely low duty ratio and high component stresses. To overcome these limitations, a phase-shift full-bridge converter with a noncoupled current-doubler rectifier (NCDR) or a coupled current-doubler rectifier (CCDR) is, respectively, proposed and implemented. In this study, performance analysis and efficiency obtained from a 500 W phase-shift full-bridge converter with two improved current-doubler rectifiers are presented and compared. From their prototypes, experimental results have verified that the phase-shift full-bridge converter with NCDR has optimal duty ratio, lower component stresses, and output current ripple. In component count and efficiency comparison, CCDR has fewer components and higher efficiency at full load condition. For small size and high efficiency requirements, CCDR is relatively suitable for high step-down voltage and high efficiency applications.

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