Back to results
US 6,333,489 B1Granted
Welding power supply with reduced OCV
AssigneeIllinois Tool Works Inc.
InventorJon O. Reynolds
Life of this patent
Estimating the term…
Abstract
A method and apparatus for providing welding power includes controlling a phase controlled power circuit to provide a reduced OCV output. Preferably, the output is controlled in response to feedback, such as current being less than or greater than a threshold.
Claims22
A welding power supply comprising:
- a phase controlled power circuit disposed to receive an ac signal and provide output power in response to at least one phase control signal;
- an output sensing circuit disposed to sense the output and provide a feedback signal in response thereto;
- and
- a voltage reduction circuit disposed to receive the feedback signal and provide a voltage reduction phase control signal as one of the at least one phase control signals.
1 more element
A welding power supply comprising:
- power circuit means for providing output power from ac input power in response to at least one phase control signal;
- feedback means for sensing the output and provide a feedback signal in response thereto;
- and
- voltage reduction means for phasing back the power circuit means in response to the feedback means when the output is below a threshold.
1 more element
A method of providing welding power comprising:
- receiving an ac input and phase controlling a power circuit to providing output power;
- sensing the output and provide a feedback signal in response thereto;
- and
- phasing back the power circuit means in response to the feedback means when the output current is below a threshold.
1 more element
A welding power supply comprising:
- a phase controlled power circuit disposed to receive an ac signal having a cycle length and provide output power to an output circuit in response to at least one phase control signal, wherein the output circuit includes an RC circuit having a time constant greater than an ac cycle length;
- an output sensing circuit disposed to sense the output and provide a feedback signal in response thereto;
- and
- a controller disposed to receive the feedback signal and provide the at least one phase control signal.
1 more element
A welding power supply comprising:
- means for receiving an ac input signal having a cycle length and for providing phase controlled power;
- delay means for providing a smoothed output, the delay means being connected to an output of the means for receiving;
- feedback means for sensing the output and providing a feedback signal in response thereto;
- and
- controller means for receiving the feedback signal and providing at least one phase control signal to the means for receiving.
2 more elements
Dependencies are inferred from the claim text.