Current control for inductive weld loads
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United States of America Patent
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N/A
Issued Date -
Dec 15, 2005
app pub date -
Jun 15, 2004
filing date -
Jun 15, 2004
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
According to an example embodiment of the present invention, a circuit arrangement controls a load current to an inductive weld load in a welding application with certain compensation for the slope of the current delivery to the inductive load, such that the average load current converges quickly to the selected command current without impacting the transient response. The circuit arrangement includes a user-engageable control adapted to specify a command current value for the inductive weld load and a current sensor adapted to measure an observed current value from instantaneous current pulses through the inductive weld load during a current supply operation that is responsive to the specified command current value. The circuit arrangement additionally includes a current-mode control circuit adapted to generate a compensation current value based on the command current value and the observed current value, a reference current value based on the command current value and the compensation current value, and at least one gate signal for controlling the load current based on the observed current value and the reference current value.
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