Abstract

A linear light-emitting diode (LED)-based solid-state lamp comprises an LED driving circuit, LED arrays, at least one rectifier, and an operation monitoring module. The LED driving circuit comprises a current sensing device that is originally used to precisely control an electric current to flow into the LED arrays. The operation monitoring module uses the same current sensing device in a way that it detects an electric shock current and determines if the linear LED- based solid-state lamp is operated in a normal mode or in an electric shock hazard mode. When an electric shock hazard is identified, the operation monitoring module shut off a return current flow from the LED arrays to reach the at least one rectifier, thus eliminating an overall through-lamp electric shock current. The scheme can effectively reduce a risk of electric shock hazard to users during relamping or maintenance.

IPC Classes  ?

• H05B 33/08 - Circuit arrangements for operating electroluminescent light sources
• H02M 1/32 - Means for protecting converters other than by automatic disconnection
• F21V 25/04 - Safety devices structurally associated with lighting devices coming into action when lighting device is disturbed, dismounted, or broken breaking the electric circuit