Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Discharge control discharge device load
Reexamination Certificate
2007-10-17
2009-02-17
Owens, Douglas W. (Department: 2821)
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
Discharge control discharge device load
C315S269000
Reexamination Certificate
active
07492105
ABSTRACT:
In a method of detecting arc discharge in a glow-discharge apparatus GD that has a high-frequency power source PS, a cutting pulse is output for time T1to the high-frequency power source PS to stop a supply of power to the glow-discharge apparatus GD, when dVr/dt−dVf/dt increases over a first level, where Vf and Vr are a traveling-wave voltage and a reflected-wave voltage applied to the glow-discharge apparatus GD, respectively. Arc discharge is determined to have developed in the glow-discharge apparatus, when Vr/Vf increases to a second level or a higher level within a preset time To after the supply of power to the glow-discharge apparatus is stopped.
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A Minh Dieu
Owens Douglas W.
Shibaura Mechatronics Corporation
Volpe and Koenig P.C.
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