Patents by Inventor Lifeng Luo
Lifeng Luo has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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System and method for real-time computation and reporting of welding machine performance and metrics
Patent number: 9839967Abstract: A welding or cutting system is provided using a performance module which monitors the real-time performance of a welding or cutting system and displays this information on a user interface on the system. Other embodiments of the system also include a cost calculation function in which a cost of the welding or cutting operation is calculated.Type: GrantFiled: November 8, 2011Date of Patent: December 12, 2017Assignee: LINCOLN GLOBAL, INC.Inventors: Todd Kooken, Matthew Jon Krueger, Lifeng Luo -
Patent number: 9751150Abstract: 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.Type: GrantFiled: August 10, 2012Date of Patent: September 5, 2017Assignee: Lincoln Global, Inc.Inventors: Joseph A. Daniel, Todd E. Kooken, Lifeng Luo
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Patent number: 9333584Abstract: A modified phase shift scheme that provides the minimum on-time and regulation benefits of the conventional phase shift method with the reduced circulating current benefits of the traditional PWM control. A welding machine comprises an inverter operatively connected to a controller, wherein the controller controls a welding process of the welding machine using modified phase shifted switching of the inverter.Type: GrantFiled: March 19, 2009Date of Patent: May 10, 2016Assignee: Lincoln Global, Inc.Inventors: Robert L. Dodge, Lifeng Luo, Todd Kooken
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Publication number: 20150014290Abstract: 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 and converts the first DC output signal to a second DC output signal of the second stage; 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 within a first housing structure and the third stage is assembled into a second module having a separate housing structure connectable to the first module with long power cables. The second module also includes wire feeding systems and electronics.Type: ApplicationFiled: October 2, 2014Publication date: January 15, 2015Inventors: Todd E. Kooken, Lifeng Luo, Matthew Krueger
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Patent number: 8829869Abstract: A welding or cutting system is provided using an interleaved buck-boost stage which dynamically controls power factor correction and operation of the interleaved buck-boost modules to optimize efficiency and operation of the welding system.Type: GrantFiled: November 8, 2011Date of Patent: September 9, 2014Assignee: Lincoln Global, Inc.Inventors: Todd Kooken, Matthew Jon Krueger, Lifeng Luo
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Patent number: 8581147Abstract: 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.Type: GrantFiled: March 24, 2005Date of Patent: November 12, 2013Assignee: Lincoln Global, Inc.Inventors: Todd E. Kooken, Lifeng Luo
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Publication number: 20130114306Abstract: A welding or cutting system is provided using an interleaved buck-boost stage which dynamically controls power factor correction and operation of the interleaved buck-boost modules to optimize efficiency and operation of the welding system.Type: ApplicationFiled: November 8, 2011Publication date: May 9, 2013Applicant: LINCOLN GLOBAL, INC.Inventors: Todd Kooken, Matthew Jon Krueger, Lifeng Luo
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SYSTEM AND METHOD FOR REAL-TIME ADJUSTMENT AND OPERATION OF COOLING FAN IN WELDING OR CUTTING SYSTEM
Publication number: 20130112367Abstract: A welding or cutting power system having a signal conversion module, which receives an AC input signal and converts the AC input signal to an output signal. The output signal is output to a load. The signal conversion module comprises at least one component which increases in temperature during operation of the signal conversion module, and a cooling fan is used to cool the at least one component of the signal conversion module. A motor is coupled to the fan to operate said cooling fan. The power system also includes a temperature sensor, which senses a temperature of the at least one component and generates a temperature feedback signal. The system further includes a fan controller that controls a rotational speed of the fan based on at least the temperature feedback signal.Type: ApplicationFiled: November 8, 2011Publication date: May 9, 2013Applicant: LINCOLN GLOBAL, INC.Inventors: Todd Kooken, Lifeng Luo -
SYSTEM AND METHOD FOR REAL-TIME COMPUTATION AND REPORTING OF WELDING MACHINE PERFORMANCE AND METRICS
Publication number: 20130116849Abstract: A welding or cutting system is provided using a performance module which monitors the real-time performance of a welding or cutting system and displays this information on a user interface on the system. Other embodiments of the system also include a cost calculation function in which a cost of the welding or cutting operation is calculated.Type: ApplicationFiled: November 8, 2011Publication date: May 9, 2013Applicant: LINCOLN GLOBAL, INC.Inventors: Todd Kooken, Matthew Jon Krueger, Lifeng Luo -
Publication number: 20120305535Abstract: 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 for of a second DC output signal electrically isolated from the first DC output signal end 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.Type: ApplicationFiled: August 10, 2012Publication date: December 6, 2012Applicant: LINCOLN GLOBAL, INC.Inventors: Joseph A. Daniel, Todd E. Kooken, Lifeng Luo
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Patent number: 8269141Abstract: 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.Type: GrantFiled: July 13, 2004Date of Patent: September 18, 2012Assignee: Lincoln Global, Inc.Inventors: Joseph A. Daniel, Todd E. Kooken, Lifeng Luo
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Publication number: 20100237053Abstract: A modified phase shift scheme that provides the minimum on-time and regulation benefits of the conventional phase shift method with the reduced circulating current benefits of the traditional PWM control. A welding machine comprises an inverter operatively connected to a controller, wherein the controller controls a welding process of the welding machine using modified phase shifted switching of the inverter.Type: ApplicationFiled: March 19, 2009Publication date: September 23, 2010Applicant: LINCOLN GLOBAL, INC.Inventors: Robert L. Dodge, Lifeng Luo, Todd Kooken
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Patent number: 7796005Abstract: 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.Type: GrantFiled: March 5, 2008Date of Patent: September 14, 2010Assignee: Lincoln Global, Inc.Inventors: George D. Blankenship, Robert L. Dodge, Todd E. Kooken, Lifeng Luo
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Patent number: 7573000Abstract: 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.Type: GrantFiled: December 23, 2004Date of Patent: August 11, 2009Assignee: Lincoln Global, inc.Inventors: George D. Blankenship, Robert L. Dodge, Todd E. Kooken, Lifeng Luo
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Publication number: 20080150664Abstract: 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.Type: ApplicationFiled: March 5, 2008Publication date: June 26, 2008Applicant: LINCOLN GLOBAL, INC.Inventors: George D. Blankenship, Robert L. Dodge, Todd E. Kooken, Lifeng Luo
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Publication number: 20060213890Abstract: 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.Type: ApplicationFiled: March 24, 2005Publication date: September 28, 2006Inventors: Todd Kooken, Lifeng Luo
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Publication number: 20060175313Abstract: 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.Type: ApplicationFiled: February 7, 2005Publication date: August 10, 2006Inventors: Todd Kooken, Lifeng Luo
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Patent number: 6995337Abstract: 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.Type: GrantFiled: July 11, 2003Date of Patent: February 7, 2006Assignee: Lincoln Global, Inc.Inventors: George G. Blankenship, Robert L. Dodge, Lifeng Luo
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Publication number: 20060011595Abstract: 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.Type: ApplicationFiled: July 13, 2004Publication date: January 19, 2006Inventors: Joseph Daniel, Todd Kooken, Lifeng Luo
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Publication number: 20050145611Abstract: 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.Type: ApplicationFiled: December 23, 2004Publication date: July 7, 2005Inventors: George Blankenship, Robert Dodge, Todd Kooken, Lifeng Luo