Led Lighting Spd Design Installation Guide Page 8 LED Lighting SPD Design & Installation Guide

LED Lighting Surge Protection Modules Design and Installation Guide 2015 Littelfuse LED Lighting SPD Module Design and Installation Guide www.littelfuse.com Components That Protect Against Induced Surge Events Protecting outdoor LED lighting from lightning induced surges requires diverting high voltage/ current transient interference away from sensitive electronics in the lighting fixture. A variety of surge protective devices (SPDs) are used in outdoor LED lighting to suppress surge energy and minimize surge impact. These include metal-oxide varistors (MOVs), gas discharge tubes (GDTs), and transient voltage suppression (TVS) diodes ( Figure 7 ). These components are designed to remain at "standby" in the circuit under normal operation. When an abnormal high-voltage transient occurs, they activate to absorb the transient energy, then return to standby mode. Original transient GDT MOV TVS diode Time Voltage Figure 7. How GDTs, MOVs, and TVS diodes respond to a transient surge to suppress the threat it poses. Of the technologies outlined in Table 2 , MOVs are preferred and widely used for surge protection in power distribution panels due to their high surge energy-handling capability and fast response to transient voltage. Therefore, MOVs are also suitable for use as surge protection devices in outdoor LED lighting applications. Technology GDT MOV TVS Diode Surge Handling Capability (8/20s) High (1kA~100kA) High (0.1kA~100kA) Medium (0.1kA~15kA) Response Time Slow (ns) Fast (ns) Faster (ps) Max. Clamping Voltage High Medium Low Leakage Current No Low Follow-on Current Yes No Fatigue Yes No Table 2. Surge protection device technologies Components That Protect Against Induced Surge Events 8

Previous Page
Next Page