Innovative High-Performance Flyback Architecture Significantly Reduces Low-Power AC/DC Losses

New ZVS solution with primary side regulation delivers efficiency above 94% and lowers BoM compared to conventional ACF and QR techniques

Modena, Italy, 22th November 2023 – Eggtronic has expanded its family of high-density power conversion solutions by unveiling an ultra-high-efficiency, low component count fixed-output AC/DC converter reference design for applications operating at powers below 120 W. The new QuarEgg® PSR (Primary Side Regulation) high-performance flyback solution significantly improves the efficiency and reduces the size of AC/DC converters that would traditionally have used active clamp flyback (ACF) and quasi-resonant (QR) topologies.

Built around Eggtronic’s patented and proven forced zero voltage switching (ZVS) architecture, QuarEgg PSR delivers a very flat idle-to-full-load efficiency curve ranging from 91% at low load to over 94.5% at maximum power. By using the architecture, designers can significantly reduce total operational losses when compared to conventional ACF and QR techniques. Target applications for QuarEgg PSR include routers, set-top-boxes, white goods and other low-power applications where efficiency and power density are key criteria but power factor correction (PFC) is not required.

At the heart of the new approach is Eggtronic’s EPIC QuarEgg PSR IC, a mixed-signal, low-power controller with multi-mode operation and synchronous rectification control that provides all the necessary primary side regulation without the need for an optocoupler. This highly integrated, miniature 5 x 5 mm device incorporates an optimized low-power mode for enhancing performance at zero and light loads and provides built-in protection against overvoltage, overcurrent, brownout and extreme temperatures.

“Designers of low-power applications are demanding ever-smaller, higher density power conversion architectures,” comments Igor Spinella, Eggtronic’s CEO and founder. “We developed the QuarEgg forced ZVS concept to address these demands by providing engineers with a solution that enables high-efficiency low- to high-load operation while reducing overall component count. In our first iteration we created a PD concept that eliminated the need for a high-voltage, high-side clamping MOSFET, and now we have extended this concept to fixed-voltage solutions that allow us to place an EPIC controller on the primary side and further drive down BoM.”

About Eggtronic

Eggtronic has been revolutionizing the world of power converters and wireless power since 2012. Based in San Francisco, Modena, Italy, Taipei and Guangzhou, Eggtronic develops cutting-edge, environmentally friendly and energy-efficient technologies, with more than 300 international patents granted worldwide. 2020 saw the launch of the new ICs division that has been producing its first microchips since 2021. Whether through B2B partnerships in the consumer, automotive, or industrial fields, or for everyday consumers, Eggtronic invents revolutionary power technologies to make modern life easier, more efficient and more connected.

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