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US 11,027,357 B2Granted
Methods and apparatus to provide welding power
AssigneeIllinois Tool Works Inc.
InventorAndrew Joseph Henry
Life of this patent
Estimating the term…
Abstract
Methods and apparatus to provide welding power are disclosed. An example welding-type power supply includes: a transformer having first and second secondary windings; switching elements configured to control current flow from the first and second secondary windings to an output; and a control circuit configured to control the switching elements to selectively output a positive output voltage or a negative output voltage without a separate rectifier stage by selecting, based on an output voltage polarity, a first subset of the switching elements to perform rectification.
Claims10
A welding-type power supply, comprising:
- a transformer having first and second secondary windings;
- a first switching element coupled between the first secondary winding and a first output terminal of the welding-type power supply;
- a second switching element coupled between the second secondary winding and the first output terminal of the welding-type power supply;
- a third switching element coupled between the first secondary winding and a second output terminal of the welding-type power supply;
- a fourth switching element coupled between the second secondary winding and the second output terminal of the welding-type power supply;
- and
- a control circuit configured to:
- output a welding voltage having a first polarity by controlling the first switching element and the second switching element to operate as a center tap between the first and second secondary windings while the third switching element and the fourth switching element operate as rectifiers;
- and
- output the welding voltage having a second polarity by controlling the third switching element and the fourth switching element to operate as the center tap between the first and second secondary windings while the first switching element and the second switching element operate as rectifiers.
7 more elements
Dependencies are inferred from the claim text.