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Power Supplies for LED Driving by Steve Winder

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CHAPTER 15 Safety Issues

This chapter discusses electrical safety and readers are advised to obtain the latest requirements from their regulatory body or safety consultant. The information here is to show that many topics must be considered, rather than as a reference for design work. Optical safety is a concern, but it is outside the scope of this book and readers are advised to consult technical data supplied by LED manufacturers.

15.1 AC Mains Isolation

Safety isolation can only be achieved with a transformer. This transformer can be placed on the AC mains supply, or as part of the switching regulator circuit. Transformer isolation on the AC mains supply is bulky because the AC signal is operating at 50 Hz or 60 Hz.

Conversely, a transformer ...

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