Programmable Device Circuits and Systems

G. Keerthi Krishna ¹, S. P. Umayal ²

Affiliations
1 Power Electronics and Drives, Sethu Institute of Technology, Kariapatti, Virudhunagar District, Tamil Nadu-626115, IN
2 Department of Power Electronics and Drives, Sethu Institute of Technology, Kariapatti, Virudhunagar District, Tamil Nadu-626115, IN

Abstract

There are two major penalties occur in off-line switching power supplies: high switching losses, and an operating environment, which is very responsive to the radiation of Electromagnetic Interference (EMI) and Radio Frequency Interference (RFI). The switching losses are a largest initiator of EMI (conducted) and RFI (radiated), so their control and reduction is a major profit to the power supply designer. Resonant techniques offer a hope for greatly reducing the switching losses and hence the factors causative to the EMI and RFI. In addition, this technique offers many other advantages such as small volume, and light weight of components due to high switching frequency, high efficiency and low reverse recovery losses in diodes owing to low di/dt at the switching instant. This work presents a resonant DC to DC converter which operating at a high frequency. The proposed circuit consists of an L-C-L resonant inverter and a bridge rectifier. Output stage of the converter is filtered by means of a low pass filter. A PID controller is provided in feedback loop for better performance. Finally, a simulation model is developed in MATLAB/SIMULINK environment. Moreover the projected topology is apparently suitable for power electronics production applications such as switching power supplies, battery chargers, telecom power supplies etc.

Keywords

DC to DC Energy Conversion, Loaded Resonant Converter, PID Controller, Resonant Converter, Soft Switching.

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G. Saranya Devi ¹, S. P. Umayal ²

Affiliations
1 Sethu Institute of Technology, Viruthunagar, IN
2 Department with the Sethu Institute of Technology, Viruthunagar, IN

Abstract

This work proposes a new interleaved buck converter (IBC) which maintains a constant output voltage to a specified value with a PID controller. The PID controller varies the duty cycle of the switches to regulate the output voltage. The proposed converter has low switching losses, reduced voltage stress and high step-down conversion ratio which is suitable for the applications where the input voltage is high. Here, two active switches are connected in series with a coupling capacitor in the power path which operates below 50% of duty ratio to reduce the voltage stress of the active switch to half the input value before turn on and after turn off. As a result of this the switching losses and capacitive discharge losses are reduced. Hence the efficiency of the converter is increased.

Keywords

Duty cycle, Interleaved Buck Converter (IBC), PID Controller, Switching Loss.

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G. Malathi ¹, S. P. Umayal ²

Affiliations
1 Drives in Sethu Institute of Technology, Kariyapatti, IN
2 Department of M.E Power Electronics and Drives at Sethu Institute of Technology, Kariyapatti, IN

Abstract

A Bridgeless SEPIC rectifier for power factor correction with low conduction losses and load regulation is proposed. The proposed SEPIC rectifier can achieve low conduction losses by provides two semiconductor switches at any time of conduction. This Sepic will act in DCM mode. The DCM operation gives additional advantages such as, zero-current turn-off; zero-current turn-on in the power switches in the output diode and reduces the complexity of the control circuitry .The output to input relation is controlled by PI controller. The proportional controller checks the error between actual and reference voltage. The integral controller will compensate this error by comparing the error with repeated sequence.DCM is preferred to produce almost unity power factor. At any time of voltage regulation line side power factor is maintained.

Keywords

Bridgeless Rectifier, Cuk Converter, Power Factor Correction (PFC), Rectifier, Sepic Converter.

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P. Manikandan ¹, S. P. Umayal ², A. Mariya Chithra Mary ¹

Affiliations
1 Department of Electrical and Electronics Engineering, Sree Sowdambika College of Engineering, Aruppukottai, IN
2 Department of Electrical and Electronics Engineering, Sethu Institute of Technology, Kariyapatti, IN

Abstract

Three-phase controlled rectifiers have a wide range of applications such as motor control in industries, dc drives, cycloconverters etc. They are used for electro-chemical process, many kinds of motor drives, traction equipment, controlled power supplies, and many other applications. The main aim of this paper is to design the three phase PWM rectifier and analyze its performance. The rectifier is designed to convert input ac power into intermediate dc power. This power conversion is done at unity power factor viewed from the supply mains. The advantage of this system is it also improves the power quality. This improved power factor improves/modifies the wave shape of line current close to sinusoidal and reduces the line amplitude of line current to reduces the line loss and hence to improve the power quality.

Keywords

Sinusoidal Line Current, PWM Rectifier, Power Factor, Power Quality.

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J. Rajeswari ¹, S. P. Umayal ¹

Affiliations
1 Sethu Institute of Technology, Virudhunagar, IN

Abstract

In the present existing power scenario to meet out the demand, multi-level inverter technology has emerged recently as a very important alternative in the area of high-power medium-voltage applications. This paper presents a complementary switching multi-level inverter using wave shift modulation control technique which combines both the level shift and phase shift modulation techniques. A 31 level inverter is designed to increase the quality of the output waveform to sinusoidal. This complementary switching reduces the number of switches thus reducing losses and total harmonic distortion (THD) in comparison with conventional multi-carrier based pulse width modulation (PWM) schemes, phase-shift (PSHM) and level-shift (LSHM) modulations. To analyze the performance of proposed technique, a 31 Level cascaded multi-level inverter is designed and simulated. In this new topology half H-bridge multilevel inverter with binary logic is used to achieve 2n levels per leg. THD and efficiency of the proposed technique is analyzed for 2kw MLI. The proposed concept is verified by using MatLab/Simulink.

Keywords

Wave Shift Multi Carrier Modulation, Complementary Switching, Cascade Multilevel Inverter, Binary Logic.

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P. Mutharasi ¹, S. P. Umayal ¹

Affiliations
1 Sethu Institute of Technology, Viruthunagar, IN

Abstract

This article presents to operate dc motor with high-efficiency by using zero-current-switching (ZCS) switched-capacitor (SC) dc-dc converter. Compared with the hard switching SC circuits, this circuit achieves ZCS for all the switches, thus minimizing the switching loss and electromagnetic interference noise. Compared to the electrolytic capacitor bank existing in the hard switching SC circuit, here in this circuit only a single ceramic capacitor of small size is used in each module to reduce the voltage ripple and achieve high efficiency. Different from other ZCS SC circuits that insert a magnetic core, the proposed circuit utilizes stray inductance that is present in series with the switch in the circuit to achieve ZCS, thus leading to small-size, low-cost, and high-reliability features. The circuit implementation and design consideration of ZCS SC dc-dc converters could be made for high-current and high-voltage-gain application. By using the proposed topology dc motor is operated with maximum speed and high efficiency.

Keywords

EMI, High Voltage Gain, Multi Level, Switched Capacitor (SC), Zero Current Switching (ZCS).

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