Overvoltage protection for current braking switch
AssigneeEsab AB
InventorRolf Karlsson
Life of this patent
Estimating the term…
Abstract
A method includes supplying a welding current to a welding zone, monitoring, during a welding current ramp down period of a given short arc welding process cycle, a voltage across a current braking switch that is in an open state and that causes a decrease in welding current being supplied to a welding zone; and when the voltage across the current braking switch that is in the open state reaches a first predetermined voltage threshold, closing the current braking switch before a completion of the welding current ramp down period of the given short arc welding process cycle.
Claims20
A method comprising:
- supplying a welding current to a welding zone;
- monitoring, during a welding current ramp down period of a given short arc welding process cycle, a voltage across a current braking switch that is in an open state and that causes a decrease in the welding current being supplied to the welding zone;
- and
- when the voltage across the current braking switch that is in the open state reaches a first predetermined voltage threshold, closing the current braking switch before a completion of the welding current ramp down period of the given short arc welding process cycle.
An apparatus comprising:
- a power supply that is configured to supply a welding current to a welding zone;
- and
- a brake switch voltage monitoring circuit configured to:
- monitor, during a welding current ramp down period of a given short arc welding process cycle, a voltage across a current braking switch that is in an open state and that causes a decrease in the welding current being supplied to the welding zone;
- and
- when the voltage across the current braking switch that is in the open state reaches a first predetermined voltage threshold, close the current braking switch before a completion of the welding current ramp down period of the given short arc welding process cycle.
An apparatus comprising:
- a power supply that is configured to supply a welding current to a welding zone;
- a brake switch voltage monitoring circuit configured to:
- monitor, during a welding current ramp down period of a given short arc welding process cycle, a voltage across a current braking switch that is in an open state and that causes a decrease in the welding current being supplied to the welding zone;
- and
- when the voltage across the current braking switch that is in the open state reaches a first predetermined voltage threshold, close the current braking switch before a completion of the welding current ramp down period of the given short arc welding process cycle;
- and
- a capacitor voltage monitoring circuit configured to cause the current braking switch to again be in the open state before the completion of the welding current ramp down period of the given short arc welding process cycle.
Dependencies are inferred from the claim text.