Power conversion system with PWM carrier emulation
AssigneeRockwell Automation Technologies, Inc.
InventorsJacob M. Lamb, Brian J. Seibel, Timothy M. Rowan, Lixiang Wei
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Abstract
Power conversion systems and a controller thereof includes a first processing system that computes phase references for respective phase lines of an inverter according to a feedback value, a setpoint value, and a scaling factor to emulate a scaled frequency that is less than a switching frequency, and a second processing system that generates a carrier waveform having the switching frequency, receives the phase reference from the first processing system for each inverter phase line, and compares each phase reference with the carrier waveform to generate pulse width modulated switching control signals for switching devices of the inverter.
Claims20
A power conversion system, comprising:
- a rectifier, including a rectifier input configured to receive a rectifier AC input signal, and a rectifier output configured to provide a DC output signal to a DC bus circuit;
- an inverter, including a DC input coupled with the DC bus circuit, an inverter output having multiple phase lines, and a plurality of inverter switching devices coupled between the DC input and the inverter output and configured to provide an inverter output signal at the inverter output to directly or indirectly drive a load;
- a first processing system configured to compute phase references for the respective phase lines of the inverter according to a feedback value, a setpoint value, and a scaling factor to emulate a scaled frequency that is less than a switching frequency;
- and
- a second processing system configured to:
- generate a carrier waveform having the switching frequency,
- receive the phase reference from the first processing system for each inverter phase line, and
- compare each phase reference with the carrier waveform to generate pulse width modulated switching control signals for the inverter switching devices.
A controller, comprising:
- a first processing system configured to compute phase references for respective phase lines of an inverter according to a feedback value, a setpoint value, and a scaling factor to emulate a scaled frequency that is less than a switching frequency;
- and
- a second processing system configured to:
- generate a carrier waveform having the switching frequency,
- receive the phase reference from the first processing system for each inverter phase line, and
- compare each phase reference with the carrier waveform to generate pulse width modulated switching control signals for switching devices of the inverter.
A method, comprising:
- using a first processor, computing phase references for respective phase lines of an inverter according to a feedback value, a setpoint value, and a scaling factor to emulate a scaled frequency that is less than a switching frequency;
- and
- using a second processor:
- generating a carrier waveform having the switching frequency,
- receiving the phase reference from the first processing system for each inverter phase line,
- comparing each phase reference with the carrier waveform to generate pulse width modulated switching control signals for switching devices of the inverter, and
- using a driver circuit, operating the switching devices of the inverter according to the pulse width modulated switching control signals to drive a load.
Dependencies are inferred from the claim text.