Closed loop analysis of Dual Bridge Converter with 4- levels

Abstract: A dual bridge (DB) LLC resonant converter for dc-dc conversion with closed loop is proposed in the system. The model is capable of delivering very low voltage, with a variable input dc fluctuations in the source side. The new PWM technique used helps the bridge output robust. The proposed model works only in 4 modes of operation. DB LLC converter uses different phase shift for each individual switches with different duty ratios. The model is simulated with 160V/200V DC input and 24V output with 20A i.e. 480W is provided to verify the operation. Keywords: Dual Bridge, LLC resonant converter, Closed loop operation, Boost converter.

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Open loop and closed loop analysis of LLC resonant converter operating at constant switching frequency by interleaving technique

2017 International Conference on Information Communication and Embedded Systems (ICICES) ◽

10.1109/icices.2017.8070783 ◽

2017 ◽

Author(s):

M. Dhivyyaa Dharshinii ◽

K. Pradeepa ◽

S. R. Akshaya ◽

S. Hema

Keyword(s):

Closed Loop ◽

Open Loop ◽

Switching Frequency ◽

Resonant Converter ◽

Loop Analysis ◽

Llc Resonant Converter ◽

Interleaving Technique

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Optimal tuning of PI controller using system identification for two-phase boost converter for low-voltage applications

International Journal of Power Electronics and Drive Systems (IJPEDS) ◽

10.11591/ijpeds.v12.i4.pp2393-2402 ◽

2021 ◽

Vol 12 (4) ◽

pp. 2393

Author(s):

M. A. N. Amran ◽

A. A. Bakar ◽

M. H. A. Jalil ◽

A. F. H. A. Gani ◽

E. Pathan

Keyword(s):

Mathematical Model ◽

System Identification ◽

Output Voltage ◽

Closed Loop ◽

Low Voltage ◽

Pi Controller ◽

Boost Converter ◽

Loop Analysis ◽

Two Phase ◽

Identification Approach

This paper presents modeling and hardware implementations of a two-phase DC-DC boost converter by using the system identification approach. The main objective of this research was to study new methods to obtain the values of the constants for the proportional-integral (PI) controller. Existing methods are time-consuming, since the values of the constants for the PI controller need to be calculated. The system identification approach for the closed-loop boost converter saves more time. This method has the fastest technique to find constants Kp and Ki for the closed-loop two-phase boost converter. To model a two-phase boost converter using the system identification approach, input duty cycle and output voltage are collected in the time domain data. In this study, the transfer function (TF) model, the autoregressive moving average with exogenous (ARMAX) model and the output-error (OE) model were used to generate a mathematical model. To perform the closed-loop analysis, constants Kp and Ki were obtained based on the generated mathematical model from the system identification approach. The result from the experiment shows that the percentages of overshoot for the TF, ARMAX and OE models were 19%, 25.36% and 24.6%, respectively. The output voltage ripples obtained for all three models were less than 5% of output voltage.

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A High Step-up DC-DC Converter Based on the Voltage Lift Technique for Renewable Energy Applications

Sustainability ◽

10.3390/su131911059 ◽

2021 ◽

Vol 13 (19) ◽

pp. 11059

Author(s):

Shahrukh Khan ◽

Arshad Mahmood ◽

Mohammad Zaid ◽

Mohd Tariq ◽

Chang-Hua Lin ◽

...

Keyword(s):

Renewable Energy ◽

Common Ground ◽

Closed Loop ◽

Low Voltage ◽

Renewable Energy Sources ◽

Input Voltage ◽

High Gain ◽

Boost Converter ◽

Open Loop ◽

Voltage Gain

High gain DC-DC converters are getting popular due to the increased use of renewable energy sources (RESs). Common ground between the input and output, low voltage stress across power switches and high voltage gain at lower duty ratios are desirable features required in any high gain DC-DC converter. DC-DC converters are widely used in DC microgrids to supply power to meet local demands. In this work, a high step-up DC-DC converter is proposed based on the voltage lift (VL) technique using a single power switch. The proposed converter has a voltage gain greater than a traditional boost converter (TBC) and Traditional quadratic boost converter (TQBC). The effect of inductor parasitic resistances on the voltage gain of the converter is discussed. The losses occurring in various components are calculated using PLECS software. To confirm the performance of the converter, a hardware prototype of 200 W is developed in the laboratory. The simulation and hardware results are presented to determine the performance of the converter in both open-loop and closed-loop conditions. In closed-loop operation, a PI controller is used to maintain a constant output voltage when the load or input voltage is changed.

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