Linear Solid-State Lighting With Electric Arc Detection And Prevention Free Of Fire Hazard

摘要

A linear light-emitting diode (LED)-based solid-state lamp comprises an LED driving circuit, LED arrays, a rectifier configured to convert an input AC voltage into a DC voltage, and an electric arc detection and current control module. The electric arc detection and current control module comprises a first derivative circuit configured to detect voltage variations from the DC voltage provided by the rectifier. The DC voltage varies drastically when an electric arc occurs while maintaining intact when the input AC voltage is not affected by the electric arc. The first derivative circuit takes a first-derivative of the voltage variations, coupling to a comparator circuit to determine if the electric arc occurs. When the electric arc is detected, the electric arc detection and current control module shuts off a current return from the LED arrays to reach the rectifier, hence preventing the electric arc from occurring during relamping or operating.