Electric heating – Metal heating – By arc
Reexamination Certificate
2006-01-31
2006-01-31
Shaw, Clifford C. (Department: 1725)
Electric heating
Metal heating
By arc
Reexamination Certificate
active
06992264
ABSTRACT:
An IGBT (16) intermittently interrupts a current from a positive terminal (12P) of a DC supply (2) to a workpiece (24). An IGBT (20) intermittently interrupts a current from a negative terminal (12N) of the DC supply (2) to the workpiece (24). A control circuit (32) and a drive signal generating circuit (34) ON-OFF control the IGBTs (16, 20). The control circuit (32) causes the drive signal generating circuit (34) to control the IGBTs (16, 20) in such a manner as to provide a repetition of a cycle consisting of an AC period during which the IGBTs (16, 20) are alternately rendered conductive, and a DC period following the AC period during which the IGBT (16) is rendered continuously conductive. Further, the control circuit (32) and the drive signal generating circuit (34) simultaneously render the IGBT (16) and the IGBT (20) nonconductive and conductive, respectively, at least once during the DC period, and, thereafter, simultaneously render the IGBT (16) and the IGBT (20) conductive and nonconductive, respectively.
REFERENCES:
patent: 5283419 (1994-02-01), Hagiwara et al.
patent: 62-61779 (1987-03-01), None
patent: 2543269 (1996-10-01), None
patent: 2543270 (1996-10-01), None
Ishii Hideo
Morimoto Takeshi
Duane Morris LLP
Sansha Electric Manufacturing Company Limited
Shaw Clifford C.
LandOfFree
Welding method and welding power supply apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Welding method and welding power supply apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Welding method and welding power supply apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3533027