# US 9,751,150 B2 · Power source for electric arc welding

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- Number: US 9,751,150 B2
- Document ID: US9751150B2
- Status: Granted
- Kind: B2
- Application number: 13/572,354
- Filed: 2012-08-10
- Published: 2012-12-06
- Granted: 2017-09-05
- Earliest claimed: 2004-07-13
- Assignees: Lincoln Global, Inc.
- Applicants: Joseph A. Daniel; Todd E. Kooken; Lifeng Luo
- Inventors: Joseph A. Daniel; Todd E. Kooken; Lifeng Luo
- Web page: https://patentgrep.com/patent/US9751150B2

## CPC

- B23K 9/1006: {Power supply}
- B23K 9/09: Arrangements or circuits for arc welding with pulsed current or voltage
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM

## 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.

## Claims

### Claim 1

A power source comprising:
an input rectifier for receipt of an AC input signal to output a rectified DC signal;
a power factor correcting converter connected to said input rectifier to convert said rectified DC signal to a first fixed DC voltage signal having a first magnitude to define a first DC bus;
DC to DC inverter connected to said first DC bus to convert said first fixed DC signal to a second fixed DC voltage signal having a second magnitude to define a second DC bus, where said second magnitude is lower than said first magnitude; and
a regulated output converter coupled to said second DC bus to convert said second fixed DC signal to an output signal for a welding process, said output converter being regulated by a feedback signal from said welding process.

### Claim 2 (depends on 1)

The power source of claim 1, wherein the DC to DC inverter is unregulated so as to not to be adjusted by a real time signal from said welding process.

### Claim 3 (depends on 1)

The power source of claim 1, wherein the input rectifier and power factor correcting converter define a preregulator, the power source comprising a first controller coupled to the preregulator and a first power supply converter coupled to the first DC bus and first controller to define a first feedback switching network and control circuit.

### Claim 4 (depends on 1)

The power source of claim 1, wherein the power source comprises a second controller coupled to the output converter and a second power supply converter coupled to the output signal and second controller to define a second feedback switching network and control circuit.

### Claim 5 (depends on 1)

The power source of claim 1, wherein said power factor correcting converter is one of: buck converter, a boost converter, a buck+boost converter.

### Claim 6 (depends on 1)

The power source of claim 1, wherein said DC to DC inverter comprises:
a network of switches to convert said first fixed DC voltage signal to a first AC signal;
an isolation transformer with a primary winding and a secondary winding for transforming said first AC signal into a second internal AC signal different than said first AC signal; and
a rectifier and capacitor to convert said second internal AC signal into said second fixed DC voltage signal.

### Claim 7 (depends on 1)

The power source of claim 1, wherein said regulated output converter is a chopper.