Surprisingly Simple Control Method Slashes Vampire Power

by Tom Lawson, CogniPower, Malvern, Pa., How2Power Today, Jul 15 2019

Focus:
A power supply control method known as Demand Pulse Regulation (DPR) enables ac-dc converters known as adapters or battery chargers to achieve higher efficiency, lower standby power, smaller size and lower cost than other control methods. This article explains DPR’s principles of operation, its efficiency benefits, experimental results, details of implementation and opportunities for further efficiency gains. The article begins by explaining how, using a tiny pulse transformer, DPR changes the feedback mechanism versus that of a conventional flyback converter. Results are given for a <1- W power converter with over 96% efficiency at just 1% of full load and standby power under 400 µW.

What you’ll learn:

• How to reduce “vampire power” in ac adapters using the Demand Pulse Regulation control method
• How to achieve very low standby power in adapters/battery chargers

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