Welding or cutting power supply using phase shift double forward converter circuit (PSDF)
First Claim
1. A method of dynamically adjusting an output voltage for a welding or cutting operation, comprising:
- detecting an increase in a voltage requirement present at a load;
increasing in phase duty cycles in a pair of forward converter circuits until the in phase duty cycles reach an upper limit as the voltage requirement present at the load increases to increase the voltage output of the pair of forward converter circuits to accommodate the increase in the voltage requirement present at the load; and
changing, as the voltage requirement further increases, a phase shift between the duty cycle of a first forward converter circuit of the pair of forward converter circuits and the duty cycle of a second forward converter circuit of the pair of forward converter circuits upon reaching the upper limit to further increase the voltage output of the pair of forward converter circuits to accommodate the further increase in the voltage requirement present at the load.
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Accused Products
Abstract
A technique for dynamically adjusting an output voltage for a welding or cutting operation is provided. The technique allows for varying output voltage at the welding or cutting torch by manipulating the duty cycles of two forward converter circuits. The present disclosure provides methods and systems for increasing synchronized duty cycles in a pair of forward converter circuits in response to increasing output voltage demand then changing a phase shift between the duty cycles in response to further increases in output voltage demand. The present disclosure provides a controller designed to receive input signals and generate output pulse width modulation signals that control the duty cycle width and phase shift of the outputs of the forward converter circuits in response to these signals. Methods of accommodating for the time needed for the transformer core to reset via leading edge or lagging edge compensation are provided.
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Citations
8 Claims
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1. A method of dynamically adjusting an output voltage for a welding or cutting operation, comprising:
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detecting an increase in a voltage requirement present at a load; increasing in phase duty cycles in a pair of forward converter circuits until the in phase duty cycles reach an upper limit as the voltage requirement present at the load increases to increase the voltage output of the pair of forward converter circuits to accommodate the increase in the voltage requirement present at the load; and changing, as the voltage requirement further increases, a phase shift between the duty cycle of a first forward converter circuit of the pair of forward converter circuits and the duty cycle of a second forward converter circuit of the pair of forward converter circuits upon reaching the upper limit to further increase the voltage output of the pair of forward converter circuits to accommodate the further increase in the voltage requirement present at the load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification