Larry Lee Church

US Patent:

6504132, Jan 7, 2003

Filed:

Aug 20, 2001

Appl. No.:

09/932685

Inventors:

Larry L. Church - Jefferson OH

Assignee:

Lincoln Global, Inc. - Monterey Park CA

International Classification:

B23K 910

US Classification:

2191301, 21913033, 363 89

Abstract:

An electric arc welder with a variable AC voltage input of up to 600 VAC and a rectifier to provide a DC link, a driven high frequency boost stage with first and second leads connected to the DC link. The boost stage comprises an inductor, a first series output branch with a first primary winding connected to the first lead and a first capacitor connected to the second lead, a second series output branch with a second primary winding connected to the second lead and a second capacitor connected to the first lead and a high frequency operated switch between the leads and having an opened condition charging said capacitors by current through the primary windings in a first direction and discharging the inductor and a closed condition charging the inductor through the primary windings by current in a second direction and discharging the inductor to charge the capacitors. The switch is operated by a power factor control circuit at a frequency greater than about 18 kHz. The boost stage has an AC output stage comprising the secondary winding network of a transformer powered by current flow in the first and second primary windings.

US Patent:

6657163, Dec 2, 2003

Filed:

Feb 6, 2002

Appl. No.:

10/067064

Inventors:

George D. Blankenship - Chardon OH
Larry L. Church - Jefferson OH

Assignee:

Lincoln Global, Inc. - Monterey Park CA

International Classification:

B23K 910

US Classification:

21913771, 21913001

Abstract:

Systems and methods are disclosed for determining an impedance between a grounding device such as a welding wire feeder ground clamp and a power supply common, and selectively allowing current flow through an electrical device associated with a welding operation according to the impedance.

US Patent:

8410399, Apr 2, 2013

Filed:

Dec 17, 2009

Appl. No.:

12/641124

Inventors:

Christopher Hsu - Avon OH, US
Larry Church - Jefferson OH, US
Jeffrey J. Krupp - Vermilion OH, US

Assignee:

Nelson Stud Welding, Inc. - Elyria OH

International Classification:

B23K 9/12

US Classification:

2191301, 21913033, 219136

Abstract:

A capacitor discharge (CD) fastener welding circuit including: an input voltage source; a rectifier bridge of diodes receiving the input voltage source; at least two capacitor charge switches linked with the rectifier bridge; at least one capacitor linked with the at least two capacitor charge switches; and at least two capacitor discharge switches linked with the capacitor and to welding output terminals.

US Patent:

20130062327, Mar 14, 2013

Filed:

Sep 13, 2011

Appl. No.:

13/231269

Inventors:

Christopher Hsu - Avon OH, US
Larry Church - Jefferson OH, US

Assignee:

Nelson Stud Welding, Inc. - Elyria OH

International Classification:

B23K 9/09
B23K 9/10

US Classification:

2191301

Abstract:

A drawn arc welding device includes a welding tool, and an energy storage device coupled to a power source. A charging circuit is connected to the energy storage device replenishing the storage device. A discharge circuit is connected to the welding tool and energy storage device. The discharge circuit regulates and adjusts a welding current of the welding tool to a specified amount. Also disclosed is a process that includes charging the energy storage device, actuating the welding tool, energizing a pilot arc current, lifting the weld stud off a workpiece to draw the pilot arc, energizing a welding arc wherein the discharge circuit regulates a welding current of the welding tool to a specified amount, and plunging the weld stud into the workpiece and turning off the discharge circuit.

US Patent:

61776459, Jan 23, 2001

Filed:

Nov 3, 1999

Appl. No.:

9/432233

Inventors:

Larry L. Church - Jefferson OH
William T. Matthews - Chesterland OH

Assignee:

Lincoln Global, Inc. - Cleveland OH

International Classification:

B23K 900

US Classification:

21912139

Abstract:

A single phase power supply module for electric arc welders and plasma arc cutters comprising: a single phase input stage; positive and negative output terminals; a full wave rectifier connected to the input stage for rectifying the single phase voltage at the input stage; a buck converter type power factor correcting circuit for controlling current flow from the input stage to the rectifier, which buck converter has an output capacitor regulated to an intermediate voltage in the range of 100-150 volts; and, a high speed DC to DC converter having an internal transformer coupling applying voltage across the output terminals and means for regulating the applied voltage to an output voltage in the range of 0-113 volts. The module is universal and several can be connected in parallel, in series or to switch networks to construct several welders or cutters.

US Patent:

60230371, Feb 8, 2000

Filed:

Nov 5, 1998

Appl. No.:

9/186087

Inventors:

Larry L. Church - Jefferson OH
William T. Matthews - Chesterland OH

Assignee:

Lincoln Global, Inc. - Cleveland OH

International Classification:

B23K 900

US Classification:

21912139

Abstract:

A single phase power supply module for electric arc welders and plasma arc cutters comprising: a single phase input stage; positive and negative output terminals; a full wave rectifier connected to the input stage for rectifying the single phase voltage at the input stage; a buck converter type power factor correcting circuit for controlling current flow from the input stage to the rectifier, which buck converter has an output capacitor regulated to an intermediate voltage in the range of 100-150 volts; and, a high speed DC to DC converter having an internal transformer coupling applying voltage across the output terminals and means for regulating the applied voltage to an output voltage in the range of 0-113 volts. The module is universal and several can be connected in parallel, in series or to switch networks to construct several welders or cutters.

US Patent:

48975222, Jan 30, 1990

Filed:

Feb 6, 1989

Appl. No.:

7/306470

Inventors:

Dale L. Bilczo - Rocky River OH
Larry L. Church - Jefferson OH
Michael J. Kurchak - Eastlake OH

Assignee:

The Lincoln Electric Company - Cleveland OH

International Classification:

B23K 910
H02M 3335

US Classification:

21913032

Abstract:

A control circuit is provided for the output of a high frequency inverter of the type having an output transformer with a core, primary windings and a secondary winding with two sections for creating a first secondary current pulse of electrical current in one section when the primary windings magnetizes the core and a second secondary current pulse in the other of the secondary sections when the primary windings remagnetizes the core. By alternating switch means for passing current through the primaries to magnetize and remagnetize the core at a preselected rate the output current pulses are provided by the two sections of secondary windings. The control circuit of the present invention involves a modification of the output transformer secondary stage. A first auxiliary winding is connected to one of the secondary sections to create an auxiliary current pulse as the core of the transformer is magnetized. A means is then employed for limiting this auxiliary current pulse and for adding the limited auxiliary current pulse to the first secondary pulse created by the secondary section to which the auxiliary winding is connected.

US Patent:

60551615, Apr 25, 2000

Filed:

Apr 12, 1999

Appl. No.:

9/290044

Inventors:

Larry L. Church - Jefferson OH
Lifeng Luo - Solon OH

Assignee:

Lincoln Global, Inc. - Cleveland OH

International Classification:

H02M 3335
H02M 318

US Classification:

363 22

Abstract:

In a switching type power supply for use in an electric arc welder or plasma cutter, of the type having an output transformer with a primary winding in a series circuit DC source with a selected voltage and a switch, either single or tandem, with a conductive on state to pass a current pulse through the primary winding in a first electrical direction and a non-conductive off state disconnecting the DC voltage source from the winding and a large filter capacitor across the DC input voltage source, the improvement comprising: a snubber network for transferring energy due to the leakage inductance of the primary winding to the filter capacitor when the switch is shifted from the on state to the off state where the snubber network includes a storage capacitor with a diode controlled resonant charging circuit so the winding is in a tank circuit with the storage capacitor to charge the storage capacitor in a charging cycle when the switch shifts from the on state to the off state and a diode controlled discharging circuit where the storage capacitor is in series with the winding and the filter capacitor to discharge the storage capacitor into the filter capacitor when the winding reverses polarity.