Impact of PWM Duty Cycle Jitter on Switching-Mode Power Converter Efficiency

2017 ◽  
Vol 32 (11) ◽  
pp. 8751-8762
Author(s):  
Feng-Yu Wu ◽  
Yaow-Ming Chen
Keyword(s):  
Duty Cycle ◽  
Power Converter ◽  
Switching Mode

scholarly journals Zero Average Surface Controlled Boost-Flyback Converter

Energies ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 57
Author(s):  
Juan-Guillermo Muñoz ◽  
Fabiola Angulo ◽  
David Angulo-Garcia
Keyword(s):  
Duty Cycle ◽  
Period Doubling ◽  
Power Converter ◽  
Control Technique ◽  
Average Surface ◽  
Flyback Converter ◽  
Stable Period ◽  
Period 2 ◽  
Wide Range ◽  
The Right

The boost-flyback converter is a DC-DC step-up power converter with a wide range of technological applications. In this paper, we analyze the boost-flyback dynamics when controlled via a modified Zero-Average-Dynamics control technique, hereby named Zero-Average-Surface (ZAS). While using the ZAS strategy, it is possible to calculate the duty cycle at each PWM cycle that guarantees a desired stable period-1 solution, by forcing the system to evolve in such way that a function that is constructed with strategical combination of the states over the PWM period has a zero average. We show, by means of bifurcation diagrams, that the period-1 orbit coexists with a stable period-2 orbit with a saturated duty cycle. While using linear stability analysis, we demonstrate that the period-1 orbit is stable over a wide range of parameters and it loses stability at high gains and low loads via a period doubling bifurcation. Finally, we show that, under the right choice of parameters, the period-1 orbit controller with ZAS strategy satisfactorily rejects a wide range of disturbances.

Suppression Approaches of Far-Field Radiated Emission Using Common-Mode Inductor

2021 ◽  
Vol 1 (2) ◽  
pp. 1-5
Author(s):  
Mengzi Li ◽  
◽  
Shishan Wang ◽  
Jian Guo
Keyword(s):  
High Frequency ◽  
Reference Value ◽  
Power Converter ◽  
Practical Significance ◽  
Far Field ◽  
Common Mode ◽  
Suppression Method ◽  
Switching Mode ◽  
Emc Design ◽  
Radiated Emission

The miniaturization and integration of Switching Mode Power Supply (SMPS) is increasing, making it more complicated to analyze and predict its far-field radiated emission, and, consequently, studying the suppression method of far-field radiated emission of SMPS is of practical significance and engineering value. In this paper, a high-frequency SMPS is selected as the research object, whose far-field radiated emission is measured under the condition of three typical suppression methods. The experimental results verified the effectiveness of common-mode inductor and are of reference value for EMC design of power converter. Keywords: SMPS; EMC; Far-field Radiated Emission;

scholarly journals Accurate Online Battery Impedance Measurement Method with Low Output Voltage Ripples on Power Converters

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1064
Author(s):  
Qi Yao ◽  
Dylan-Dah-Chuan Lu ◽  
Gang Lei
Keyword(s):  
Duty Cycle ◽  
Measurement Method ◽  
Power Converters ◽  
Impedance Measurement ◽  
High Amplitude ◽  
Power Converter ◽  
Wide Frequency Range ◽  
Perturbation Source ◽  
Battery State Of Charge ◽  
Input Side

The conventional online battery impedance measurement method works by perturbing the duty cycle of the DC-DC power converter and measuring the response of the battery voltage and current. This periodical duty cycle perturbation will continuously generate large voltage ripples at the output of power converters. These large ripples will not easily be removed due to the high amplitude and wide frequency range and would be a challenge to meet tight output regulation. To solve this problem, this paper presents a new online battery impedance measurement technique by inserting a small switched resistor circuit (SRC) into the converter. The first contribution of this work is that the perturbation source is moved from the main switch to the input-side of the converter, so the ripples are reduced. The analysis and experimental results of the proposed method show a reduction of 16-times compared with the conventional method. The second contribution tackles the possible change of the battery state of charge (SOC) during the online battery measurement process, which will inevitably influence the impedance measurement accuracy. In this proposed method, battery impedance at multiple frequencies can be measured simultaneously using only one perturbation to accelerate measurement speed and minimize possible SOC change. The experimental impedance results coincide with a high-accuracy laboratory battery impedance analyzer.

scholarly journals Rancang Bangun Sistem Catu Daya dengan Metode Switching Mode Power Supply (SMPS) Berbasis Arduino untuk Aplikasi Electrospinner

2020 ◽  
Vol 8 (1) ◽  
pp. 25-34
Author(s):  
Khoirul Effendi ◽  
◽  
Junaidi Junaidi ◽  
Sri Wahyu Suciyati ◽  
◽  
...  
Keyword(s):  
High Voltage ◽  
Duty Cycle ◽  
Power Supply ◽  
Output Voltage ◽  
Electronic Devices ◽  
Laboratory Scale ◽  
Power Supplies ◽  
Syringe Pump ◽  
Switching Mode Power Supply ◽  
Switching Mode

Research about power supplies has been developed for various requirement. The power supply is used to supply electronic devices and laboratory-scale equipment, one of which is electrospinner. Electrospinner is an instrument used to make nanofibers consisting of several components, namely: power supply, high voltage, syringe pump, and collector drum. Electrospinner requires a stable supply of voltage so that the system can work well and requires a lot of voltage supply to supply components from the electrospinner. Arduino-based switching mode power supply (SMPS) is designed in this research. Arduino-based SMPS makes it possible to produce a stable supply with many outputs. Arduino as a PWM generator is used to control the power supply output voltage based on duty cycle. The results of the study addressed the duty cycle affecting the output of the power supply. The output voltage generated by the power supply can be set from 0-100 V with an accuracy of 98.19%, an error of 1.81% and a precision of 0.02% which is stated by the variation of the coefficient. The power supply produced also has an extra output voltage of 15 VCT and 15 V.

scholarly journals Optimal Conversion of DC-DC Converter Considered Optimal Switching Time and Optimal Switching Mode of PWM by Fuzzy based PID Tuning

2020 ◽  
Vol 9 (4) ◽  
pp. 1785-1790
Keyword(s):  
Pid Controller ◽  
Fuzzy Controller ◽  
Switching Time ◽  
Design Method ◽  
Power Converter ◽  
Optimal Switching ◽  
Tuning Method ◽  
Pid Tuning ◽  
Dc Power ◽  
Switching Mode

This paper deals with design method of fuzzy controller for improving efficiency of DC-DC power converter. To design optimal control by fuzzy, this paper introduces optimal switching time and optimal switching mode of PWM. DC-DC Power converter is one of energy conversion device to transfer DC input source to DC output. When they transfer DC to DC, they have been using PID controller or fuzzy controller. Therefore, the efficiency of DC conversion strongly depends on PID parameter. Some papers illustrate tuning method of PID controller for this but have not been mentioning about the switching time and switching mode that can influence on the efficiency of DC-DC conversion. This paper suggests effective DC-DC conversion method by means of introducing switching time and switching mode into fuzzy based PID tuning

A switched-capacitor power converter with unequal duty cycle for ripple reduction and efficiency improvement

2020 ◽  
Vol 104 ◽  
pp. 104888
Author(s):  
Yulun Wu ◽  
Yerzhan Mustafa ◽  
Yan Lu ◽  
Alex Ruderman ◽  
Rui P. Martins
Keyword(s):  
Duty Cycle ◽  
Power Converter ◽  
Switched Capacitor ◽  
Efficiency Improvement ◽  
Ripple Reduction

Design and Research of Switched Reluctance Motor Converter Used in Electric Vehicle

2010 ◽  
Vol 40-41 ◽  
pp. 277-282
Author(s):  
Jing Sun ◽  
Xin Wang
Keyword(s):  
Electric Vehicles ◽  
Power Supply ◽  
High Reliability ◽  
Switched Reluctance Motor ◽  
Power Converter ◽  
Operating Efficiency ◽  
Switched Reluctance ◽  
Reluctance Motor ◽  
Switching Mode Power Supply ◽  
Switching Mode

In recent years, there has been a growing interest in switched reluctance motor when it is widely used in the field of electric vehicles for its simple structure, low cost, high reliability, wide speed range, high response speed, high operating efficiency and strong renewable braking ability. The performance and structure of the power converter will directly affect the efficiency, cost and reliability of SRM, so the reasonable design of SRM power converter is the key to increase the cost performance of the whole SRM speed control system. Based on the principle and advantages of SRM, an improved asymmetrical half-bridge structure power converter with soft-switching is proposed for SRD in the paper. The DC / DC switching mode power supply for switched reluctance motor drive system is also successfully designed based on LT1247 integrated chip. Experiment results show that the new type of power converter and the DC / DC switching mode power supply can work better on electric vehicles.

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