Sunday, May 19, 2024

Auxiliary Power Supply Reference Design

Streamlined design boosts operational efficiency, reliability, meeting rising demands in industrial and solar gear.

In response to the increasing requirements for efficient, reliable, and cost-effective offline Switch Mode Power Supplies (SMPS), particularly in industrial and solar settings, the development of a low-power (<100W) power converter with galvanic isolation becomes paramount. This auxiliary power supply plays a critical role in converting electric power from a High Voltage Direct Current (HV DC) bus to a Low Voltage (LV) source, powering essential control circuits, sensing circuits, cooling fans, and various equipment, ensuring optimal functionality and performance.

The design by Microchip offers efficient high-voltage (HV) to low-voltage (LV) conversion for LV subsystems, incorporating a single switch mode flyback topology with a 1700V mSiC MOSFET, which not only ensures efficient conversion but also protects against peak switching voltage and voltage fluctuations across the transformer leakage inductance. The design has a wide range of voltage inputs, from 250V to 1000V, paired with dual-voltage outputs of +24V/2A and +15V/1A, catering to diverse industrial and photovoltaic applications where voltage variations are prevalent. Key features include a single switch mode flyback topology, wide input voltage range, dual voltage outputs, and high power conversion efficiency. The integration of a single switch mode flyback topology enhances efficiency and reliability in HV to LV conversion, while the wide input voltage range ensures adaptability to diverse voltage variations. The provision of dual voltage outputs meets the multifaceted power requirements of various equipment and systems, while the high power conversion efficiency optimizes energy utilization and reduces operational costs through a current-mode Pulse-Width Modulation (PWM) controller-based closed-loop control.

The versatility and reliability of this power converter design make it suitable for a myriad of applications, including industrial motor drives, solar inverters, uninterruptible power supplies (UPS), general-purpose inverters, cascaded H-bridge converters, and modular multilevel converters. In conclusion, the integration of innovative features and robust design principles culminates in a power converter solution that addresses the evolving needs of industrial and photovoltaic applications, setting a benchmark for performance, reliability, and cost-effectiveness in the realm of SMPS technology.

Microchip has thoroughly tested this reference design, which includes Altium design files, a PLECS software model, a user guide, a Bill of Materials (BoM), and more. Additional information about the reference design can be found on the company’s website. For further details on this reference design, please click here.

Akanksha Gaur
Akanksha Gaur
Akanksha Sondhi Gaur is a journalist at EFY. She has a German patent and brings a robust blend of 7 years of industrial & academic prowess to the table. Passionate about electronics, she has penned numerous research papers showcasing her expertise and keen insight.

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