Power supply for resistance welding units

• US 20060138095A1
• Filed: 11/28/2005
• Published: 06/29/2006
• Est. Priority Date: 12/04/2004
• Status: Active Grant

• Current Assignee: Bosch Rexroth AG (Robert Bosch GmbH)
• Original Assignee: Bosch Rexroth AG (Robert Bosch GmbH)
• Inventors: Klinger, Thomas, Stellwag, Dieter
• Granted Patent: US 8,178,816 B2
• Time in Patent Office: Days
• US Class Current: 219/108
• CPC Class Codes: B23K 11/241 Electric supplies B23K11/248 takes precedence
• CPC Class Codes: B23K 11/243 Multiple welding installations fed by one source
• CPC Class Codes: H02J 3/00 Circuit arrangements for ac mains or ac distribution networks

Abstract

A device for resistance welding includes a welding clamp housing, a welding transformer, a welding clamp, a welding clamp drive for operating welding clamp and a power supply by alternating supply voltage, which may be built as small as possible and may be simple to expand, the power supply being implemented by a main converter and by drive and welding converters, the output of main converter being connected to the inputs of drive and welding converters, the inputs of drive and welding converters being connected to one another and the connection being implemented by an a.c. voltage intermediate circuit.

Claims

1. A resistance welding device, comprising:

a power supply including a main converter and at least one auxiliary converter, all of the converters connected with one another via an a.c. voltage intermediate circuit.

2. The device according to claim 1, wherein a first one of the auxiliary converters is arranged as a drive converter to an electrical drive, and a second one of the auxiliary converters is arranged as a welding converter to a welding clamp.

3. The device according to claim 2, wherein the main converter and the drive converter are adapted to convert an input voltage with respect to at least one of (a) phase and (b) frequency, the welding converter arranged as a load power control.

4. The device according to claim 3, wherein the load power control is arranged as a phase-angle control.

5. The device according to claim 2, wherein at least one of (a) a welding clamp housing and (b) a welding transformer housing includes at least one of (a) drive converters, (b) welding converters and (c) a welding control.

6. The device according to claim 2, wherein one of (a) a welding clamp drive includes at least two electrical drives, each electrical drive including a separate drive converter and (b) the welding clamp drive includes at least two electrical drives, each electrical drive including a separate drive converter, the drive converters using a common d.c. voltage intermediate circuit.

7. The device according to claim 2, at least one of (a) the main converter and (b) a welding control is adapted to monitor a total power to be generated by the main converter for loads connected to at least one of (a) the drive converter and (b) the welding converter.

8. The device according to claim 7, wherein a total power limit control is adapted to perform the monitoring, loads managed for operation in accordance with a management instructions such that a requested power of all loads connected to the main converter does not exceed a permitted peak load.

9. The device according to claim 1, wherein the main converter includes a device adapted to influence harmonic waves.

10. The device according to claim 2, further comprising a device adapted to at least one of (a) pneumatically operate and (b) hydraulically operate the welding clamp.

11. A robot, comprising:

a resistance welding device, including;

a power supply including a main converter and at least one auxiliary converter, all of the converters connected with one another via an a.c. voltage intermediate circuit.