Patent ID: 7868278

Claim:
An auto darkening eye protection device comprising: a shutter assembly adjustable between a light state and a dark state; and a control circuit comprising: a power supply having a voltage; a sensing circuit sensing an occurrence of a welding arc and providing an output indicative of the occurrence of the welding arc; a weld detect circuit receiving the output of the sensing circuit, the weld detect circuit enabling a high voltage pulse and a stable AC waveform to be delivered to the shutter assembly; and a positive voltage generator and a negative voltage generator receiving power from the power supply and cooperating to output the high voltage pulse and the stable AC waveform to the shutter assembly to switch the shutter assembly from the light state to the dark state upon enablement by the weld detect circuit, wherein the positive voltage generator and the negative voltage generator are coupled to the shutter assembly such that the stable AC waveform directly passes from the positive voltage generator and the negative voltage generator to the shutter assembly.