Surges and Transients Can't Read Specifications! How to Protect Power Supplies Against Real-World Threats
by Kevin Parmenter, Excelsys Technologies, Chandler, Ariz. and Tim Patel, Littelfuse, Chicago, Ill., How2Power Today, Nov 15 2016
Focus:
There are numerous standards and specifications in the industry regarding electrical
overstress. But in the real world, transients and surges often exceed the test
specifications and damage the power supply. However, the specifications and circuit
protection techniques used to protect against surges and transients in outdoor LED
lighting are extremely robust, yet highly cost effective. This extensive presentation
explains why circuit protection techniques developed for LED power supplies are
suitable
for most other power supply applications, describes global safety and surge immunity
standards in the lighting field, and offers detailed discussion and guidance on the
use of
MOVs for surge protection. The benefits of thermally protected MOVs are demonstrated.
What you’ll learn:
- How to understand the requirements of global surge immunity standards such as IEEE C62.41.1, Energy Star and IEC 61000-4-5
- How to understand the surge protection techniques that are used in LED luminaires and apply them generally to power supplies
- How to understand the value of MOVs (especially thermally protected MOVs) in power supply surge protection
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