Patent ID: 6376998
Filing Date: 2002-04-23
Classification: H05B

Abstract:
A power supply device for lighting electric discharge, high pressure mercury vapor lamps having an arc discharge resistance during arc discharge and a glow discharge resistance during glow discharge, comprising:a cathode and an anode disposed in a discharge space which is enclosed by an inclusion body in which noble gas as well as at least 0.15 mg of mercury per 1 mm3 of said discharge space are sealed, a power supply; a simulated arc discharge resistor having a resistance which is virtually equal to the arc discharge resistance during said arc discharge, said simulated arc discharge resistor being connected to the power supply; simulated glow discharge resistors having virtually {fraction (1/7)} of the glow discharge resistance occurring during said glow discharge; an output terminal, and a switchable connection, the switchable connection being arranged to switch a connection of the simulated arc discharge resistor to the output terminal to a connection of said simulated glow discharge resistors to the output terminal in a manner causing a simulated glow discharge current, in a transient state of switching from a state of flow of simulated arc discharge current, to be under 30% of said simulated arc discharge current for less than 10 &mgr;s and then to current recover to at least 70% of said simulated arc discharge current in less than 100 &mgr;s.