Engine driven inverter welding power supply
First Claim
1. A stand alone 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 inverter output and the feedback input wherein a feedback signal responsive to at least one inverter output operating parameter is provided to the feedback input.
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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.
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Citations
34 Claims
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1. A stand alone 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 output and the feedback input wherein a feedback signal responsive to at least one inverter output operating parameter is provided to the feedback input. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A stand alone 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 output and the feedback input, for providing a feedback signal responsive to at least one inverter output operating parameter to the feedback input. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A method of providing 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;
multiplying signals representative of the ac inverter output voltage and current to obtain a signal representative of power, and integrating the signal representative of power, and providing a feedback responsive thereto; and
controlling the engine using the feedback. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34)
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Specification