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Lifeng L Luo

from Solon, OH
Age ~63

Lifeng Luo Phones & Addresses

  • 5581 High Point Rd, Solon, OH 44139 (440) 519-9526
  • 1454 Golden Gate Blvd, Cleveland, OH 44124
  • Mayfield Heights, OH
  • Troy, MI
  • Lebanon, NH

Work

Company: Lincoln electric Position: Engineer

Industries

Machinery

Resumes

Resumes

Lifeng Luo Photo 1

Engineer

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Location:
Solon, OH
Industry:
Machinery
Work:
Lincoln Electric
Engineer

Business Records

Name / Title
Company / Classification
Phones & Addresses
Lifeng Larry Luo
COVA POWER CONVERSION INC

Publications

Us Patents

Open Shipyard Wire Feeder

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US Patent:
6705563, Mar 16, 2004
Filed:
Apr 4, 2002
Appl. No.:
10/117936
Inventors:
Lifeng Luo - Solon OH
Ronald J. Sears - Worthington OH
Assignee:
Lincoln Global, Inc. - Monterey Park CA
International Classification:
B65H 1602
US Classification:
242557, 2425644, 242599, 2425981, 2181372, 21813771, 280 4311, 280 4716, 280 4719, 280 472
Abstract:
An open shipyard feeder for supplying a consumable welding wire on a wire spool to a welding gun. The feeder includes a frame having a base extending in a longitudinal direction between a forward end and a rearward end and which supports the feeder on an underlying surface. The frame further includes a spool support means connected to the frame near the rearward end and which rotatably retains the wire spool relative to the frame allowing the spool to rotate about a spool axis. The feeder includes a wire advancing mechanism mounted on the frame for paying wire from the spool on the spool support to the welding gun. The feeder further includes a control box on the frame near the forward end. The feeder frame is rigid yet light weight and can support the wire feeder on a wide range of underlying surfaces while still being easily transportable.

Power Source With Saturable Reactor

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US Patent:
6995337, Feb 7, 2006
Filed:
Jul 11, 2003
Appl. No.:
10/617120
Inventors:
George G. Blankenship - Chardon OH, US
Robert L. Dodge - Mentor OH, US
Lifeng Luo - Solon OH, US
Assignee:
Lincoln Global, Inc. - Monterey Park CA
International Classification:
B23K 9/10
US Classification:
2191301
Abstract:
In a power source for an electric arc welder including an inverter having two primary circuits connected in a series circuit across the DC bus of an input rectifier where each primary circuit comprises a capacitor parallel with a primary winding section and a switch to apply the voltage of the capacitor across the primary winding section, so that the primary circuits alternately create a voltage pulse in the primary winding sections to induce voltage pulses in a secondary circuit having a secondary winding coupled to said primary windings and connected by an output circuit to an output welding circuit. There is provided one improvement. The improvement is a soft ferrite saturable reactor in at least one of the series circuit or the output circuit to delay the voltage pulse in the primary winding sections.

Power Source For Plasma Device

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US Patent:
7573000, Aug 11, 2009
Filed:
Dec 23, 2004
Appl. No.:
11/019893
Inventors:
George D. Blankenship - Chardon OH, US
Robert L. Dodge - Mentor OH, US
Todd E. Kooken - University Hts. OH, US
Lifeng Luo - Solon OH, US
Assignee:
Lincoln Global, inc. - City of Industry CA
International Classification:
B23K 10/00
US Classification:
21912154, 21912148, 336186
Abstract:
A plasma device including a power source for creating an AC output signal with a matrix transformer between said power source and a series circuit comprising a first lead and a second lead. The matrix transformer including at least two modules with a first primary portion formed of first and second tubes connected at one end and a second primary portion formed of third and fourth tubes connected at one end, with said third and fourth tubes mounted in, and electrically isolated from, said first and second tubes, respectively, where said concentric tubes define generally parallel elongated passages through the module. A secondary winding is wrapped through the elongated passages of each module. There is a first series circuit from the power source to the matrix transformer for passing the first polarity of the AC output signal through the first primary sections of the modules, a second series circuit from the power source to the matrix transformer for passing the second polarity of the output signal through the second primary sections, a rectifier for each of the secondary windings of the modules and a third series circuit connecting the rectifiers in series with the first and second leads so a voltage of over about 500 volts is across these leads.

Power Source For Plasma Device

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US Patent:
7796005, Sep 14, 2010
Filed:
Mar 5, 2008
Appl. No.:
12/042889
Inventors:
George D. Blankenship - Chardon OH, US
Robert L. Dodge - Mentor OH, US
Todd E. Kooken - University Heights OH, US
Lifeng Luo - Solon OH, US
Assignee:
Lincoln Global, Inc. - City of Industry CA
International Classification:
H01F 17/06
H01F 27/28
B23K 9/10
US Classification:
336175, 336186, 2191301
Abstract:
A plasma device including a power source for creating an AC output signal with a matrix transformer between said power source and a series circuit comprising a first lead and a second lead. The matrix transformer including at least two modules with a first primary portion formed of first and second tubes connected at one end and a second primary portion formed of third and fourth tubes connected at one end, with said third and fourth tubes mounted in, and electrically isolated from, said first and second tubes, respectively, where said concentric tubes define generally parallel elongated passages through the module. A secondary winding is wrapped through the elongated passages of each module. There is a first series circuit from the power source to the matrix transformer for passing the first polarity of the AC output signal through the first primary sections of the modules, a second series circuit from the power source to the matrix transformer for passing the second polarity of the output signal through the second primary sections, a rectifier for each of the secondary windings of the modules and a third series circuit connecting the rectifiers in series with the first and second leads so a voltage of over about 500 volts is across these leads.

Power Source For Electric Arc Welding

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US Patent:
8269141, Sep 18, 2012
Filed:
Jul 13, 2004
Appl. No.:
10/889866
Inventors:
Joseph A. Daniel - Sagamore Hills OH, US
Todd E. Kooken - University Hts. OH, US
Lifeng Luo - Solon OH, US
Assignee:
Lincoln Global, Inc. - City of Industry CA
International Classification:
B23K 9/10
B23K 9/12
US Classification:
2191301, 219137 PS
Abstract:
A power source for an electric arc welding process, wherein the power source comprises an input stage having an AC input and a first DC output signal; a second stage in the form of an unregulated DC to DC converter having an input connected to the first DC output signal and an output in the form of a second DC output signal electrically isolated from the first DC output signal and with a magnitude of a given ratio to the first DC output signal; and, a third stage to convert the second DC output signal to a welding output for the welding process.

Auxiliary Power Supply For A Welding Machine

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US Patent:
8426772, Apr 23, 2013
Filed:
Sep 2, 2009
Appl. No.:
12/552782
Inventors:
Lifeng Larry Luo - Solon OH, US
Assignee:
Lincoln Global, Inc. - Industry CA
International Classification:
H05B 1/00
H05B 3/42
US Classification:
21913021, 21913031, 21913032, 21913033, 2191304
Abstract:
A electric welding machine having an auxiliary power output, and a method for controlling the auxiliary power output on a welding machine is provided. In one embodiment, the system includes a main transformer having a first secondary winding in circuit communication with a welder power output and a second secondary winding in circuit communication with an auxiliary power supply having an auxiliary power output. The auxiliary power supply includes an input for monitoring the welder power output to determine if the welder power output is on; circuitry for determining whether a surge or spike in demand is present at the auxiliary power output; and circuitry for limiting the available power to the auxiliary power output if certain conditions are satisfied. One method includes monitoring the demand on an auxiliary power output, monitoring a welding power output, determining whether there is a spike in the demand on the auxiliary power output that is above a first limit, and reducing the available power to the auxiliary power output if the spike is above the first limit and the welding power output is energized.

Three Stage Power Source For Electric Arc Welding

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US Patent:
8581147, Nov 12, 2013
Filed:
Mar 24, 2005
Appl. No.:
11/087179
Inventors:
Todd E. Kooken - University Heights OH, US
Lifeng Luo - Solon OH, US
Assignee:
Lincoln Global, Inc. - City of Industry CA
International Classification:
B23K 9/00
US Classification:
2191377, 21913051, 2191301, 21913021
Abstract:
A three stage power source for an electric arc welding process comprising an input stage having an AC input and a first DC output signal; a second stage in the form of an unregulated DC to DC converter having an input connected to the first DC output signal, a network of switches switched at a high frequency with a given duty cycle to convert the input into a first internal AC signal, an isolation transformer with a primary winding driven by the first internal high frequency AC signal and a secondary winding for creating a second internal high frequency AC signal and a rectifier to convert the second internal AC signal into a second DC output signal of the second stage, with a magnitude related to the duty cycle of the switches; and, a third stage to convert the second DC output signal to a welding output for welding wherein the input stage has a regulated DC to DC converter with a boost power switch having an active soft switching circuit.

Modular Power Source For Electric Arc Welding And Output Chopper

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US Patent:
20060175313, Aug 10, 2006
Filed:
Feb 7, 2005
Appl. No.:
11/051196
Inventors:
Todd Kooken - University Hts. OH, US
Lifeng Luo - Solon OH, US
International Classification:
B23K 9/10
US Classification:
219130100
Abstract:
A three stage power source for an electric arc welding process comprising an input stage having an AC input and a first DC output signal; a second stage in the form of an unregulated DC to DC converter having an input connected to the first DC output signal, a network of switches switched at a high frequency with a given duty cycle to convert the input into a first internal AC signal, an isolation transformer with a primary winding driven by the first internal high frequency AC signal and a secondary winding for creating a second internal high frequency AC signal and a rectifier to convert the second internal AC signal into a second DC output signal of the second stage; with a magnitude related to the duty cycle of the switches and, a third stage to convert the second DC output signal to a welding output for welding wherein the input stage and the second stage are assembled into a first module and the third stage is assembled into a second module connectable to the first module.
Lifeng L Luo from Solon, OH, age ~63 Get Report