IEEE Power Electronics Magazine - December 2020 - 36
©SHUTTERSTOCK/DANYLIUK KONSTANTINE
How
to Design
and Implement an
Adapter Power Supply
With Active Clamp Flyback
An all silicon design methodology
by Ahsan Zaman and Aleksandar Radic
D
esigning power supplies, especially for power
adapters, requires that the designer possess a
particular level of expertise and insight into
implementing the best architecture. This level
of expertise is especially relevant when using
a power architecture known as Active Clamp Flyback
(ACF). This article will demonstrate, to designers, a
practical design method to obtain a reliable, robust, efficient, and high power density, ACF architecture with the
bonus of fast time-to-market. Designers can eliminate
that conventional Resistor Capacitor Diode (RCD) snubber circuit in their flyback converter design and learn
the more efficient ways of active clamp operation. The
ultimate solution is an all-Silicon design in a single package which also includes continuous advanced adaptive
cycle-by-cycle digital control circuit for im--proved performance over varying line/load/temperature as well as
component tolerances. The outcome of the proposed
Digital Object Identifier 10.1109/MPEL.2020.3033608
Date of current version: 16 December 2020
36
IEEE POWER ELECTRONICS MAGAZINE
z December 2020
design is high efficiency and power density, low EMI,
and stringent line/load regulation.
Shrinking the mobile power supply, especially for adaptors and chargers in laptops, smart phones, game consoles,
tablets, drones and more, challenges designers to increase
the power density and efficiency in the power supply design.
Compared to traditional flyback converters, the ACF converter adds a clamp circuit which recycles the leakage
energy of the transformer and achieves near-Zero Voltage
Switching (ZVS) for the primary power switch, making the
converter more efficient and suitable for high switching frequency operation, increasing the power density. This article
will demonstrate, to designers, an optimum design method
to obtain a reliable, robust, efficient, and high power density,
ACF architecture with the bonus of fast time-to-market.
Conventional Flyback Converter Architecture
In today's electronics market, small size, light weight, low
cost and high efficiency are understood as the most basic
and necessary goals of power supply design, especially in
the power adapter and charger arena. A traditional dc-dc
2329-9207/20©2020IEEE
IEEE Power Electronics Magazine - December 2020
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