International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 11 Issue: 09 | Sep 2024
p-ISSN: 2395-0072
www.irjet.net
Advanced DC-DC Converter with Triple Outputs for Spacecraft Power Distribution Santoshkumar Gadigeppa Asooti1, Dr. Parth Sarathi Panigrahy2, Narendrababu HB3, Bhoopendra Kumar Singh4 1First Author Affiliation & Address1P G Student, RV College of Engineering, Bengaluru 2Assistant Professor, RV College Of Engineering, Bengaluru
3Assistant Manager, Centum Electronics Limited, Bengaluru 4Director, Centum Electronics Limited, Bengaluru
---------------------------------------------------------------------***--------------------------------------------------------------------
Abstract - An electrical load is energized by a power source
regulated output voltage by varying the MOSFET's duty cycle. In this project, the UC2825 PWM IC is used for voltage mode control, providing simple forward control, improved cross regulation, and a good noise margin. However, for better load and cross regulation in multi-output converters, coupled inductors are used. This triple-output forward converter is being designed for space applications, where reduced size, weight, and high reliability are critical. The design achieves the targeted efficiency of 82% as per the specifications.
designed to precisely convert input current into the specific voltage, current, and frequency required for device functionality. Optimized transformer design is employed to minimize leakage inductance in the core winding, focusing on reducing energy loss, enhancing efficiency, and decreasing overall size and weight. Switched-mode power supplies (SMPS) are superior to linear supplies in achieving these objectives, with forward topology being particularly suited for low to medium-power applications due to its simplicity, costeffectiveness, and ease of adding multiple outputs. However, forward topology presents challenges such as suboptimal cross-regulation and high voltage stress on the MOSFET switch, which are mitigated through the use of snubber circuits and coupled inductors. This project endeavors to design a triple-output forward converter with integrated protection circuits to enhance reliability. Utilizing the UC2825 PWM IC for primary side voltage mode control, the converter operates at a 500 KHz switching frequency. The final design, incorporating coupled inductors for improved regulation, achieves the targeted 82% efficiency.
1.1 Specification of the converter Table 1 shows the specifications of the Converter. Table.1: Converter Specifications
Keywords: Transformer Design, MOSFET Selection, External Synchronous Circuit, Coupled Inductors Topology, UC2825 PWM IC, UC2901 Isolated Feedback IC & Efficiency
1. INTRODUCTION Switched-Mode Power Supplies (SMPS) offer advantages like higher efficiency, better voltage regulation, compact size, and multiple isolated outputs, making them a preferred replacement for linear power supplies. SMPS regulates power delivery through the on-off switching of semiconductor transistors. For lowoutput power applications (a few watts to under 100 watts) with isolated inputs and outputs, forward converter topology is simpler and cost-effective, despite being less efficient than other SMPS circuits. Forward converters use output inductance and freewheeling diodes, and Pulse Width Modulation (PWM) control is employed to maintain
© 2024, IRJET
|
Impact Factor value: 8.315
|
Parameter
Specifications
Input Voltage Range
60V - 100V DC
Nominal Input Voltage
70V DC
Topology
Forward DC-DC Isolated Converter
Switching Frequency
500 KHz
Output Voltage & Current
5V / 4A +15V / 0.667A -15V / 0.667A
Efficiency
78-82%
Line Regulation
1%
Load Regulation
2%
Duty Cycle
20-80%
Output Power
40 W
Output Voltage Ripple
<2%
Operating Temperature Range
–55°C to 125°C
ISO 9001:2008 Certified Journal
|
Page 232