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RISS 인기검색어
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- 저자 : Sathi Rama Reddy (검색결과 6 건)
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Ranganathan Sripriya,Sathi Rama Reddy 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.5
A quadratic boost converter (QBC) off ers a wide range of operations and reduced input current ripple that is suitable for hybrid PV/Wind systems. This paper presents a fast response sliding mode controller with more state feedback for the multi-input QBC system connected to DC micro-grid. The control scheme elaborates on the systematic process of arriving controllable canonical form, the advent of the sliding surface, determination of control law, and explanation of sliding mode existence manifold—the controllable canonical form obtained from state-space equations. The proposed controller ensures a model reference robust dynamics against changing operating conditions, variations of circuit parameters, and external disturbances. Obtained sliding surface satisfy Routh–Hurwitz property, and the switching law maintains the converter in sliding mode. The dynamics are studied using MATLAB/Simulink, and the stability of the system is analysed using the bode plot. A prototype is set up for the two-input QBC, and the experimental results are presented to validate the simulation results.
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Booma Nagarajan,Rama Reddy Sathi,Pradeep Vishnuram 대한전기학회 2014 Journal of Electrical Engineering & Technology Vol.9 No.6
Power requirement to the induction heating system varies during the heating process. A closed loop control is required to have a smooth control over the power. In this work, a constant frequency pulse density modulation based power tracking control scheme for domestic induction heating system is developed using the Fuzzy Logic Controller. In the conventional power modulation schemes, the switching losses increase with the change in the load. The proposed pulse density modulation scheme maintains minimum switching losses for the entire load range. This scheme is implemented for the class-D series resonant inverter system. Fuzzy logic controller based power tracking control scheme is developed for domestic induction heating power supply for various power settings. The open loop and closed loop simulation studies are done using the MATLAB/Simulink simulation tool. The control logic is implemented in hardware using the PIC16F877A microcontroller. Fuzzy controller tracks the set power by changing the pulse density of the gate pulses applied to the inverter. The results obtained are used to know the effectiveness of the fuzzy logic controller to achieve the set power.
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Nagarajan, Booma,Sathi, Rama Reddy,Vishnuram, Pradeep The Korean Institute of Electrical Engineers 2014 Journal of Electrical Engineering & Technology Vol.9 No.6
Power requirement to the induction heating system varies during the heating process. A closed loop control is required to have a smooth control over the power. In this work, a constant frequency pulse density modulation based power tracking control scheme for domestic induction heating system is developed using the Fuzzy Logic Controller. In the conventional power modulation schemes, the switching losses increase with the change in the load. The proposed pulse density modulation scheme maintains minimum switching losses for the entire load range. This scheme is implemented for the class-D series resonant inverter system. Fuzzy logic controller based power tracking control scheme is developed for domestic induction heating power supply for various power settings. The open loop and closed loop simulation studies are done using the MATLAB/Simulink simulation tool. The control logic is implemented in hardware using the PIC16F877A microcontroller. Fuzzy controller tracks the set power by changing the pulse density of the gate pulses applied to the inverter. The results obtained are used to know the effectiveness of the fuzzy logic controller to achieve the set power.
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Nagarajan, Booma,Sathi, Rama Reddy The Korean Institute of Power Electronics 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.1
Resonant converters are well suited for induction heating (IH) applications due to their advantages such as efficiency and power density. The control systems of these appliances should provide smooth and wide power control with fewer losses. In this paper, a simple phase locked loop (PLL) based variable duty cycle (VDC) pulse density modulation (PDM) power control scheme for use in class-D inverters for IH loads is proposed. This VDC PDM control method provides a wide power control range. This control scheme also achieves stable and efficient Zero-Voltage-Switching (ZVS) operation over a wide load range. Analysis and modeling of an IH load is done to perform a time domain simulation. The design and output power analysis of a class-D inverter are done for both the conventional pulse width modulation (PWM) and the proposed PLL based VDC PDM methods. The control principles of the proposed method are described in detail. The validity of the proposed control scheme is verified through MATLAB simulations. The PLL loop maintains operation closer to the resonant frequency irrespective of variations in the load parameters. The proposed control scheme provides a linear output power variation to simplify the control logic. A prototype of the class-D inverter system is implemented to validate the simulation results.
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Improved Modification of the Closed-Loop-Controlled AC-AC Resonant Converter for Induction Heating
Kirubakaran Dhandapani,Rama Reddy Sathi 한국전자통신연구원 2009 ETRI Journal Vol.31 No.3
A single-switch parallel resonant converter for induction heating is implemented. The circuit consists of an input LC-filter, a bridge rectifier, and a controlled power switch. The switch operates in soft commutation mode and serves as a high frequency generator. The output power is controlled via the switching frequency. A steady state analysis of the converter operation is presented. A closedloop circuit model is also presented, and the experimental results are compared with the simulation results.
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Booma Nagarajan,Rama Reddy Sathi 전력전자학회 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.1
Resonant converters are well suited for induction heating (IH) applications due to their advantages such as efficiency and power density. The control systems of these appliances should provide smooth and wide power control with fewer losses. In this paper, a simple phase locked loop (PLL) based variable duty cycle (VDC) pulse density modulation (PDM) power control scheme for use in class-D inverters for IH loads is proposed. This VDC PDM control method provides a wide power control range. This control scheme also achieves stable and efficient Zero-Voltage-Switching (ZVS) operation over a wide load range. Analysis and modeling of an IH load is done to perform a time domain simulation. The design and output power analysis of a class-D inverter are done for both the conventional pulse width modulation (PWM) and the proposed PLL based VDC PDM methods. The control principles of the proposed method are described in detail. The validity of the proposed control scheme is verified through MATLAB simulations. The PLL loop maintains operation closer to the resonant frequency irrespective of variations in the load parameters. The proposed control scheme provides a linear output power variation to simplify the control logic. A prototype of the class-D inverter system is implemented to validate the simulation results.
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