Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
This paper describes the analysis and design of a low cost three phase inverter brushless dc motor (BLDC) drive. For effective utilization of the developed system, a novel direct current controlled pwm scheme (DPC) is designed and... more
This paper describes the analysis and design of a low cost three phase inverter brushless dc motor (BLDC) drive. For effective utilization of the developed system, a novel direct current controlled pwm scheme (DPC) is designed and implemented.. The operational principle of the four-switch BLDC motor drive and the developed control scheme are theoretically analyzed and the performance is demonstrated by simulation.
Research Interests:
Power supplies with active power factor correction (PFC) techniques are becoming necessary to meet harmonic regulations and standards. Conventional PFC scheme has lower efficiency due to significant losses in the diode bridge. In an... more
Power supplies with active power factor correction (PFC) techniques are becoming necessary to meet harmonic regulations and standards. Conventional PFC scheme has lower efficiency due to significant losses in the diode bridge. In an effort to maximize the power supply efficiency, considerable research efforts have been directed toward designing bridgeless PFC circuits, where the number of semiconductors generating losses is reduced by eliminating the full bridge input diode rectifier. A bridgeless PFC Rectifier allows the current to flow through a minimum number of switching devices compared to the conventional PFC rectifier. Accordingly, the converter conduction losses can be significantly reduced and higher efficiency can be obtained, as well as cost savings. Several bridgeless topologies, which are suitable for step-up/step-down applications have been introduced. The CUK converter offers several advantages in PFC applications. Unlike the SEPIC converter, the CUK converter has bot...
Research Interests:
High-step-up and high-efficiency DC-DC converters are necessary to handle large input currents and to reach high output voltages. Here the low voltage source is boosted to high voltages for feeding into inverter drive three phase... more
High-step-up and high-efficiency DC-DC converters are necessary to handle large input currents and to reach high output voltages. Here the low voltage source is boosted to high voltages for feeding into inverter drive three phase induction motor. The conventional boost converter realize high voltage gains at rather large duty cycles (normally exceeding 50%) resulting in saturation of inductors but the impedance networks boost converter can reach a higher voltage gain with fewer diodes and small duty cycle and avoid instability caused by saturation of its inductors. Further, it can well fulfill the stringent industrial requirements, particularly of renewable power systems. Theoretically conventional boost converters may realize infinite voltage gains for switching duty-cycles very close to 100\% which however degrade the converter's overall efficiency. The induction motor became the workhorse in the industries. Low cost, high efficiency, high robustness, reliability and low maint...
Research Interests:
Induction heating applications require high frequency currents which are obtained using resonant converters viz., Series and Parallel resonant inverters. The resonance frequency in these converters will be tuned to a high value. A... more
Induction heating applications require high frequency currents which are obtained using resonant converters viz., Series and Parallel resonant inverters. The resonance frequency in these converters will be tuned to a high value. A single-switch parallel resonant converter for induction heating is discussed. Pulse width modulation (PWM) is used to control the switches. To study the performance of the topologies, simulations has been carried out in MATLAB 2010 environment. It is compared with the existing inverter topologies; half bridge and full bridge.Vienna rectifier as front end is used instead of conventional diode bridge rectifier to provide continuous sinusoidal input current at the source side with extremely low distortion. So we can improve the power factor near to unity and the total harmonic distortion can be reduced to a value below 5%. This power converter is more suitable and acceptable for cost effective high frequency (HF) consumer induction heating applications
Research Interests:
Modern trend in power generation is the use of two-stage configuration i.e., allocating a single PV cell to a converter to produce grid voltage of adequate requirement and then to convert DC to AC voltage for grid cnnection. Usually, the... more
Modern trend in power generation is the use of two-stage configuration i.e., allocating a single PV cell to a converter to produce grid voltage of adequate requirement and then to convert DC to AC voltage for grid cnnection. Usually, the first stage is a DC-DC boost type converter which is responsible for extracting maximum power from panel and boosting PV voltage to a value higher than peak of grid voltage. A converter is proposed, which is derived from an active network based converter, is chosen as the first stage and a five level inverter is used as the second stage of the configuration. Thus, in overall, the converter used is having high gain and reduced switching stress. The Inverter used is having the advantage of low filter requirement, reduced stress, EMI and reduced THD level. A closed loop control of the converter is done to maintain constant output voltage under varying input voltage. MATLAB R2014a version software is used to simulate the model. The prototype of the two ...
This paper describes the analysis and design of a low cost three phase inverter brushless dc motor (BLDC) drive.For effective utilization of the developed system, a novel direct current controlled pwm scheme (DPC)is designed and... more
This paper describes the analysis and design of a low cost three phase inverter brushless dc motor (BLDC) drive.For effective utilization of the developed system, a novel direct current controlled pwm scheme (DPC)is designed and implemented.. The operational principle of the four-switch BLDC motor drive and the developed control scheme are theoretically analyzed and the performance is demonstrated by simulation. Keywords—Brushless DC (BLDC) motor drive, four-switch inverter.