scholarly journals Analysis of Intrinsic Switching Losses in Superjunction MOSFETs Under Zero Voltage Switching

Energies ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1124
Author(s):  
Maria Rogina ◽  
Alberto Rodriguez ◽  
Diego G. Lamar ◽  
Jaume Roig ◽  
German Gomez ◽  
...  
Keyword(s):  
Simulation Models ◽  
Soft Switching ◽  
Energy Losses ◽  
Switching Frequency ◽  
Zero Voltage Switching ◽  
Power Transistors ◽  
Switching Losses ◽  
Light Load ◽  
High Switching Frequency ◽  
Output Capacitance

Switching losses of power transistors usually are the most relevant energy losses in high-frequency power converters. Soft-switching techniques allow a reduction of these losses, but even under soft-switching conditions, these losses can be significant, especially at light load and very high switching frequency. In this paper, hysteresis and energy losses are shown during the charge and discharge of the output capacitance (COSS) of commercial high voltage Superjunction MOSFETs. Moreover, a simple methodology to include information about these two phenomena in datasheets using a commercial system is suggested to manufacturers. Simulation models including COSS hysteresis and a figure of merit considering these intrinsic energy losses are also proposed. Simulation and experimental measurements using an LLC resonant converter have been performed to validate the proposed mechanism and the usefulness of the proposed simulation models.

Switching Losses in a SiC-Based DC-DC Multilevel Boost Converter

2012 ◽  
Vol 717-720 ◽  
pp. 1241-1244
Author(s):  
Omid Mostaghimi ◽  
Nicolas G. Wright ◽  
Alton B. Horsfall
Keyword(s):  
Duty Cycle ◽  
Conversion Ratio ◽  
Design Parameters ◽  
Switching Frequency ◽  
Multilevel Converters ◽  
Switching Losses ◽  
Light Load ◽  
High Switching Frequency ◽  
Operation Results ◽  
Voltage Conversion

In the aerospace industry where the weight and power density are important design parameters, high frequency operation results in smaller passive components. Furthermore, to achieve a large voltage conversion ratio, which is a goal for payload systems, the use of transformers increases the size and power losses of the system. To fulfill the space and weight requirements, a transformer-less SiC-based DC-DC multilevel converter providing high voltage conversion ratios without an extremely high duty cycle has been realized. The experimental high switching frequency and low current results for a conventional, 3-level and 4-level converter utilizing Si and SiC based COTS diodes are presented. SiC-based multilevel converters show a higher efficiency due to the low reverse recovery and fast switching of the diodes, which results in a higher voltage conversion ratio. This translates to a lower duty cycle to obtain the required output voltage, whilst eliminating the need for complex filtering even under light load conditions.

scholarly journals Positive output elementary Luo converter for fixed-frequency ZVS operation

2017 ◽  
Vol 65 (2) ◽  
pp. 255-262
Author(s):  
S. J. V. Bright ◽  
S. Ramkumar ◽  
H. Anand
Keyword(s):  
Electromagnetic Interference ◽  
Experimental Studies ◽  
Soft Switching ◽  
Switching Frequency ◽  
Fixed Frequency ◽  
Zero Voltage Switching ◽  
Power Semiconductor ◽  
Semiconductor Switches ◽  
Switching Losses ◽  
Zero Voltage

Abstract Luo converter is one amid the developed DC-DC converters offering higher voltage gain. Soft-switching techniques, like zero-voltage switching (ZVS), repress switching losses, and hence the system efficiency and the life of the power semiconductor switches are improved. Incorporation of soft switching in fixed-frequency operation of the Luo converters may persuade them in the regulated power supply applications. The existing variable switching frequency solution suffers from a number of problems viz. complexity in filter designing, more electromagnetic interference (EMI), etc. This paper proposes a positive output elementary Luo converter (POELC) involving ZVS with the wherewithal of working in fixed frequency. A comprehensive discussion on the proposed circuit topology is detailed with both simulation and experimental studies. Systematic descriptions of basic POELC, variable-frequency ZVS-POELC, and fixed-frequency ZVS-POELC make an impact on the understanding of related concepts by the researchers in this field.

A Novel Soft Switching Based Fuzzy Logic Control for Single Phase Inverter

2014 ◽  
Vol 573 ◽  
pp. 143-149
Author(s):  
N. Ismayil Kani ◽  
B.V. Manikandan ◽  
Prabakar Perciyal
Keyword(s):  
Fuzzy Logic ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Soft Switching ◽  
Switching Frequency ◽  
Pwm Inverter ◽  
Zero Voltage Switching ◽  
Control Scheme ◽  
Zero Voltage ◽  
Voltage Switching

—This The Pulse Width Modulation (PWM) DC-to-AC inverter has been widely used in many applications due to its circuit simplicity and rugged control scheme. It is however driven by a hard-switching pulse width modulation (PWM) inverter, which has low switching frequency, high switching loss, high electro-magnetic interference (EMI), high acoustic noise and low efficiency, etc. To solve these problems of the hard-switching inverter, many soft-switching inverters have been designed in the past. Unfortunately, high device voltage stress, large dc link voltage ripples, complex control scheme and so on are noticed in the existing soft-switching inverters. This proposed work overcomes the above problems with simple circuit topology and all switches work in zero-voltage switching condition. Comparative analysis between conventional open loop, PI and fuzzy logic based soft switching inverter is also presented and discussed. Keywords—Zero voltage switching, Inverter, Dc link, PI controller, Fuzzy logic system control ,Modulation strategy, Soft switching

Research on Multi-Mode Controller of Switching Power Supply

2014 ◽  
Vol 568-570 ◽  
pp. 1217-1220
Author(s):  
Shu Lin Liu ◽  
Li Li Qi
Keyword(s):  
Power Supply ◽  
Switching Frequency ◽  
Switching Power Supply ◽  
Load Range ◽  
Heavy Load ◽  
Operating Modes ◽  
Switching Power ◽  
Advantages And Disadvantages ◽  
Switching Losses ◽  
Light Load

In order to improve the efficiency of the switching power supply in whole load range, the controller with PWM, PFM and BURST operating modes is designed in this paper, which changes the operation mode automatically according to the load. The operating principle and the advantages and disadvantages of the three operating modes are analyzed and compared. PWM mode is used in heavy load; PFM mode is used in light load to reduce switching losses by reducing the switching frequency and BURST mode is used at the standby time to further reduce switching losses. The main control module is designed and simulation results verify the feasibility of the designed circuit.

Designing of Improved Series Resonant Inverter with FPGA Controller for Heating Applications

2020 ◽  
pp. 2150088
Author(s):  
S. Dhayanandh ◽  
S. Manoharan
Keyword(s):  
High Frequency ◽  
Switching Frequency ◽  
Zero Voltage Switching ◽  
Resonant Inverter ◽  
Series Resonance ◽  
High Switching Frequency ◽  
Series Resonant ◽  
Higher Power ◽  
Series Resonant Inverter ◽  
And Control

Intensive utilization of Induction Heating (IH) innovations can be seen in numerous areas such as manufacturing industries, domestic or house hold and medicinal applications. The development of high switching frequency switches has encouraged the structure of high frequency inverters which are the key component of IH technology. Controlling the power output in a high frequency inverter for IH application is relatively complicated. This paper focuses on designing and developing a typical series resonance inverter and control it by FPGA-based controller. A MOSFET switch-based DC to AC converter is designed and Zero Voltage Switching (ZVS)-based switching strategy is accomplished to acquire less stress on switching devices and greater conversion efficiency. In this technique, secondary switched capacitor cell was proposed for resonant inverter of high frequency. To optimize the performance of the proposed inverter, the FPGA-based control system is implemented. Higher power density is the greatest advantage of this topology. The experimental and simulation model of the proposed series resonant inverter (SRI) for heating applications is developed and simulated using MATLAB/Simulink software.

Soft Switching in Switched Inertance Hydraulic Circuits

2016 ◽  
Author(s):  
Alexander C. Yudell ◽  
James D. Van de Ven
Keyword(s):  
High Speed ◽  
Soft Switching ◽  
Power Delivery ◽  
Lumped Parameter Model ◽  
Energy Losses ◽  
Hydraulic Systems ◽  
Zero Voltage Switching ◽  
Lumped Parameter ◽  
Capacitive Element ◽  
Zero Voltage

Switched Inertance Hydraulic Systems (SIHS) use inductive, capacitive, and switching elements to boost or buck a pressure from a source to a load in an ideally lossless manner. Real SIHS circuits suffer a variety of energy losses, with throttling of flow during transitions of the high-speed valve resulting in 44% of overall losses. These throttling energy losses can be mitigated by applying the analog of zero-voltage-switching, a soft switching strategy, adopted from power electronics. In the soft switching circuit, the flow that would otherwise be throttled across the transitioning valve is stored in a capacitive element and bypassed through check valves in parallel with the switching valves. To evaluate the effectiveness of soft switching in a boost converter SIHS, a lumped parameter model was constructed. The model demonstrates that soft switching can improve the efficiency of the circuit up to 42% and extend the power delivery capabilities of the circuit by 76%.

Load-Adaptive Soft-Switching Energy Recovery Sustainer for Plasma Display

2012 ◽  
Vol 241-244 ◽  
pp. 632-635
Author(s):  
H. L. Do
Keyword(s):  
Theoretical Analysis ◽  
Energy Recovery ◽  
Soft Switching ◽  
Switching Frequency ◽  
Switching Loss ◽  
Switching Characteristic ◽  
Switching Losses ◽  
Plasma Display ◽  
And Performance ◽  
A Current

In this paper, an energy recovery for plasma display is proposed. The proposed energy recovery sustainer provides soft-switching of main sustain switches and reduces the switching loss. Due to soft-switching characteristic, the switching losses of main switches are significantly reduced. In addition, the conduction losses in both main and auxiliary switches are effectively reduced by varying a current build-up time according to image patterns. Theoretical analysis and performance of the proposed energy recovery sustain driver were verified on an experimental prototype operating at 200 kHz switching frequency.

Research on the High Frequency Realization of High-Power Inverter

2011 ◽  
Vol 383-390 ◽  
pp. 1077-1083
Author(s):  
Run Hua Liu ◽  
Gang Wang
Keyword(s):  
High Power ◽  
High Frequency ◽  
Output Voltage ◽  
Harmonic Distortion ◽  
Soft Switching ◽  
Multilevel Inverter ◽  
Switching Frequency ◽  
Switching Losses ◽  
Simulation And Experiment

The paper presents the inverter method which based on cascade multilevel inverter and MOSFET-assisted soft-switching of IGBT and modulation strategy against the double requirement of high-power inverter and high frequency. The method can effectively improve the output voltage, reduce harmonic distortion and switching losses, improve the switching frequency and meet the double requirement of the high-power inverter and high frequency. The method proved to be feasible by simulation and experiment.

scholarly journals Design and operation of closed-loop triple-deck buck-boost converter with high gain soft switching

2020 ◽  
Vol 11 (1) ◽  
pp. 523
Author(s):  
S. Narasimha ◽  
Surender Reddy Salkuti
Keyword(s):  
Closed Loop ◽  
High Gain ◽  
Pi Controller ◽  
Boost Converter ◽  
Vital Role ◽  
Soft Switching ◽  
Parallel Operation ◽  
Zero Voltage Switching ◽  
Switching Losses ◽  
Zero Voltage

<span>This paper presents the design and operation of three-stage buck-boost converter with high gain soft switching using closed loop proportional integral (PI) controller. The proposed converter is designed by arranging three identical buck-boost converters working in parallel. The converter units are connected to each other by an inductor as a bridge. This inductor plays a vital role in soft switching operation of converter by maintaining the voltage applied to switches at zero voltage at switching intervals, i.e., the zero-voltage switching (ZVS). The closed-loop system is designed by PI controller, and it maintains the output constant irrespective of changes in input, and the system becomes stable. The proposed converter is efficient in reducing switching losses, leading to improved converter efficiency. Due to parallel operation of three identical converters, the output voltage and input current contain fewer ripples than those of a single converter with same specifications. Proposed converter is more economical and reliable with simpler structure as it utilizes only two inductors as extra elements. The design and analysis of proposed circuit has been carried out in MATLAB Simulink by operating the circuit in various modes.</span>

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