International Research Journal of Engineering and Technology (IRJET) Volume: 11 Issue: 08 | Aug 2024
www.irjet.net
e-ISSN: 2395-0056 p-ISSN: 2395-0072
Design and Implementation of Efficient DC to DC Converter with Forward Converter Topology For Low Power Applications Ashish Kumar N H1, Dr. Anitha G S2, Santosh B L3, Bhoopendra Kumar Singh4, Suriya S5 1Dept of Electrical and Electronics, RV College of Engineering, Bengaluru, India 2Dept of Electrical and Electronics, RV College of Engineering, Bengaluru, India 3Assistant manager, Design, Centum Electronics Ltd, Bangalore, India 4Director, Design, Centum Electronics Ltd, Bangalore, India
5Engineer, Design, Centum Electronics Ltd, Bangalore, India
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Abstract- The power supply module in the space application use Forward Converter topology due to its advantage such as reduction in weight and providing the isolation on input & output of the converter. The Forward Converter having the high switching frequency of 140KHz to reduce the size of the converter with the feed forward technique and PWM controller UC2525 IC. MOSFET is used for the switching and RCD snubber are used to decrease the stress of MOSFET. The driver IC used to control the gate pulse of MOSFET and LM358 IC are used. The proposed converter is of 5V/2A single output for the input range of 30V-44V. Output of the converter is controlled by Mag-amp connected across the secondary winding of the transformer with some output filters. The paper describes about design, analysis, hardware implementation of efficient DC DC converter with Forward converter for low power application. The converter requires some major protection such as under voltage protection, over voltage protection, over current protection and short circuit protection. The proposed converter provides the lesser output ripple and better efficiency at the nominal voltage along with full load condition. The hardware of this converter is tested for the various input voltage and different load condition with nearly constant output voltage
topologies for isolated output voltage and low power applications are forward converter due to their tiny transformer size, simple structure, and efficiency[3].With these converters, transformer demagnetization is a potential risk. Different transformer resetting strategies, such as (i) adding an additional reset winding or (ii) utilizing a snubber circuit, can be used to demagnetize transformers[4].
Switched-mode power converters are now extensively utilized because they are smaller and more efficient than conventional power sources. Reduced size and weight are the advantages of SMPS which is required for space applications. The present space research organizations drive towards lighter, smaller, more efficient, low-cost and high-reliable power supply[1]. Satellites employ a variety of dc/dc converters in their electrical power systems. The heritage design features of the dc/dc converter topologies utilized in satellites differ from those of the dc/dc converters used on Earth[2].The most popular
The use of magnetic amplifiers, or "Mag-amps," is an easy and affordable way to manage auxiliary outputs. A saturable inductor used for a controlled switch is called a mag-amp[5]. Unsaturated coils have a high impedance and block the entire voltage, while saturated coils have zero voltage and carry the full current. Mag-amps provide several benefits, including low noise, excellent precision, power savings, and dependability[6][7]. An interesting approach to enable output voltage regulation at constant frequency is to increase the energy stored by the inductor and follow a conventional PWM control strategy[8].The most crucial components of the power supply unit are the protection circuits. In addition to input under-voltage and output overvoltage protection, the proposed converter also includes output over current protection. The protective circuit activates when the output current surpasses 125% of the intended output current, shutting down the converter and preventing a serious failure of the power supply unit[9]. The core saturation theory underlies the operation of the Magamps. These are saturable inductor, meaning that the entire voltage appears across the mag-amp coil, drops to zero, and carries the entire current when the core hits the saturation level. The coil blocks the entire voltage and no current passes through it when unsaturated[10][11]. Magnetic amplifiers work incredibly well and are simple to utilize as post regulators to control the secondary side's output voltage[12].A resistor, capacitor, and diode (RCD) clamp can be used as an alternate technique for resetting a forward converter transformer .The resistor, capacitor, and diode are the only three parts of the straightforward RCD clamp circuit, which only needs a more straightforward two winding transformer. The clamp absorbs the magnetizing inductor energy as well as provides a discharge path for the leakage
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Keywords—Forward converter, PWM controller, Mag amp, Protection Circuit, Filters I. INTRODUCTION
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