Engine driven inverter welding power supply
First Claim
1. A stand alone welding power supply comprising;
- a primary mover mechanically coupled to a rotating shaft;
a generator having a rotor mechanically coupled to the shaft, and further having a stator magnetically coupled to the rotor, whereby the generator provides a generator output;
an inverter having an inverter input in electrical communication with the generator output, wherein the inverter inverts power from the inverter input to provide an inverter output;
a controller coupled to the primary mover and having a feedback input; and
a feedback circuit coupled to the welding output and the feedback input wherein a feedback signal responsive to welding current and welding voltage is provided to the feedback input, and wherein the feedback circuit includes a multiplier, wherein the multiplier multiplies signals representative of voltage and current to obtain a signal representative of power, and further wherein the feedback circuit includes an integrator to integrate the signal representative of power.
1 Assignment
0 Petitions
Accused Products
Abstract
A method and apparatus for welding with an engine driven inverter power supply includes generating an ac output with an engine and generator. The output is rectified and inverted to provide an ac inverter output. The engine is controlled using feedback indicative of a welding output operating parameter. The feedback may also be taken from the inverter or generator, and the generator may be controlled instead of or in addition to the engine. Engine parameters that may be controlled include engine speed, selecting between an idle speed and a run speed, a throttle position, a fuel pump, an injection timer, a fuel to air ratio, fuel consumption and ignition timing. Another aspect of the invention is having the feedback be responsive to one or more of the welding current, welding voltage, welding power, or functions thereof. The feedback may be responsive to the current, voltage, power, ripple and functions thereof. An aux power output is derived directly from the generator and feedback from the aux load is used to determine if the engine should be idling or running at high speed.
84 Citations
33 Claims
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1. A stand alone welding power supply comprising;
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a primary mover mechanically coupled to a rotating shaft; a generator having a rotor mechanically coupled to the shaft, and further having a stator magnetically coupled to the rotor, whereby the generator provides a generator output; an inverter having an inverter input in electrical communication with the generator output, wherein the inverter inverts power from the inverter input to provide an inverter output; a controller coupled to the primary mover and having a feedback input; and a feedback circuit coupled to the welding output and the feedback input wherein a feedback signal responsive to welding current and welding voltage is provided to the feedback input, and wherein the feedback circuit includes a multiplier, wherein the multiplier multiplies signals representative of voltage and current to obtain a signal representative of power, and further wherein the feedback circuit includes an integrator to integrate the signal representative of power. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A stand alone welding power supply comprising;
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a primary mover mechanically coupled to a rotating shaft; a generator having a rotor mechanically coupled to the shaft, and further having a stator magnetically coupled to the rotor, whereby the generator provides a generator output; an inverter having an inverter input in electrical communication with the generator output, wherein the inverter inverts power from the inverter input to provide an inverter output; control means, coupled to the primary mover and having a feedback input, for controlling the primary mover; and feedback means, coupled to the welding output and the feedback input, for providing a feedback signal responsive to at least one welding output operating parameter to the feedback input, wherein the feedback means includes a multiplier means for multiplying signals representative of output voltage and current to obtain a signal representative of power, and further wherein the feedback means includes an integrator means for integrating the signal representative of power. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A method of providing welding power comprising;
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generating an electrical output with an engine and generator; inverting the electrical input to provide an ac inverter output; controlling the engine speed using feedback indicative of a welding output operating parameter; and providing feedback responsive to welding power. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A stand alone welding power supply comprising;
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a primary mover mechanically coupled to a rotating shaft; a generator having a rotor mechanically coupled to the shaft, and further having a stator magnetically coupled to the rotor, whereby the generator provides a generator output; an inverter having an inverter input in electrical communication with the generator output, wherein the inverter inverts power from the inverter input to provide an inverter output; a controller coupled to the primary mover and having a feedback input; and a feedback circuit coupled to the welding output and the feedback input wherein a feedback signal responsive to ripple in the welding output is provided to the feedback input.
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29. A stand alone welding power supply comprising;
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a primary mover mechanically coupled to a rotating shaft; a generator having a rotor mechanically coupled to the shaft, and further having a stator magnetically coupled to the rotor, whereby the generator provides a generator output; an inverter having an inverter input in electrical communication with the generator output, wherein the inverter inverts power from the inverter input to provide an inverter output; a controller coupled to the primary mover and having a feedback input; and a feedback circuit coupled to the inverter and the feedback input wherein a feedback signal responsive to ripple in the inverter is provided to the feedback input.
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30. A stand alone welding power supply comprising;
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a primary mover mechanically coupled to a rotating shaft; a generator having a rotor mechanically coupled to the shaft, and further having a stator magnetically coupled to the rotor, whereby the generator provides a generator output; an inverter having an inverter input in electrical communication with the generator output, wherein the inverter inverts power from the inverter input to provide an inverter output; control means, coupled to the primary mover and having a feedback input, for controlling the primary mover; and feedback means, coupled to the welding output and the feedback input, for providing a feedback signal responsive to ripple in the welding output to the feedback input.
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31. A stand alone welding power supply comprising;
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a primary mover mechanically coupled to a rotating shaft; a generator having a rotor mechanically coupled to the shaft, and further having a stator magnetically coupled to the rotor, whereby the generator provides a generator output; an inverter having an inverter input in electrical communication with the generator output, wherein the inverter inverts power from the inverter input to provide an inverter output; control means, coupled to the primary mover and having a feedback input, for controlling the primary mover; and feedback means, coupled to the inverter and the feedback input, for providing a feedback signal responsive to ripple in the inverter to the feedback input.
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32. A method of providing welding power comprising;
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generating an electrical output with an engine and generator; inverting the electrical input to provide an ac inverter output; controlling the engine using feedback indicative of a welding output ripple.
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33. A method of providing welding power comprising;
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generating an electrical output with an engine and generator; inverting the electrical input to provide an ac inverter output; controlling the engine using feedback indicative of an inverter ripple.
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Specification