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AssigneeRockwell Automation Technologies, Inc.
InventorsRussel J. Kerkman, David W. Schlegel, David Leggate
Estimating the term…
A method and apparatus for reducing parasitic distortion in terminal voltages connected to a PWM inverter, the method comprising the steps of receiving each of a command operating frequency and a command carrier frequency, comparing the command operating frequency to low and high threshold operating frequency values, and where the command operating frequency is less than the low threshold frequency, restricting the carrier frequency to a minimum carrier frequency, where the command operating frequency is greater than the high threshold frequency, setting the carrier frequency equal to the command carrier frequency and, where the operating frequency is between the low and high threshold frequencies, setting the carrier frequency to an intermediate value between the minimum carrier frequency and the commanded carrier frequency.
An apparatus for controlling an inductive load, the apparatus comprising:
An apparatus for reducing inverter terminal voltage distortion in a system that receives an operating frequency signal, converts the operating frequency signal to modulating waveforms and compares a carrier waveform to the modulating waveforms to generate inverter firing pulses, the system also including a carrier frequency selector for selecting a command carrier frequency, the apparatus comprising:
A method for reducing inverter terminal voltage distortion in a system that receives an operating frequency signal, converts the operating frequency signal to modulating waveforms and compares a carrier waveform to the modulating waveforms to generate inverter firing pulses, the system also including a carrier frequency selector for selecting a command carrier frequency, the method comprising the steps of:
An apparatus for generating PWM inverter firing signals, the apparatus comprising:
Dependencies are inferred from the claim text.