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US 2015/0146462 A1Published application
Current source power conversion apparatus and current source power conversion method
AssigneeKabushiki Kaisha Yaskawa Denki
InventorKatsutoshi YAMANAKA
Life of this patent
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Abstract
When first drive signals are driving signals for applying a short-circuit mode for turning on a plurality of switching elements of the same output phase, the current source power conversion apparatus according to one embodiment generates second drive signals for applying the short-circuit mode to an output phase having the smallest absolute value of a phase voltage, and switches the first drive signals to the second drive signals.
Claims16
A current source power conversion apparatus comprising:
- an inverter having a plurality of switching elements connected in series for each output phase between a positive terminal and a negative terminal of a direct current source;
- and
- a drive controller configured to control the inverter based on line-to-line current commands by an output mode for turning on the switching elements of different phases and supplying current between output inter-phases and a short-circuit mode for turning on the plurality of switching elements of a same output phase,
- wherein the drive controller includes:
- a current command corrector configured to increase or decrease a plurality of line-to-line current commands with respect to the carrier signal so that all of the plurality of line-to-line current commands to different output inter-phases are greater than or equal to a bottom value or less than or equal to a peak value of a carrier signal;
- a signal generator configured to generate first drive signals for respectively driving the plurality of switching elements so that a target output phase of the short-circuit mode differs between a case of a state where all of the plurality of line-to-line current commands are smaller than the carrier signal and a case of a state where all of the plurality of line-to-line current commands are greater than the carrier signal;
- and
- a selector configured to generate second drive signals for applying the short-circuit mode to an output phase having the smallest absolute value of a phase voltage when the first drive signals are drive signals for applying the short-circuit mode and switch the first drive signals to the second drive signals.
5 more elements
A current source power conversion method including:
- increasing or decreasing a plurality of line-to-line current commands with respect to a carrier signal so that all of the plurality of line-to-line current commands outputted to an inverter having a plurality of switching elements connected in series provided for each output phase between a positive terminal and a negative terminal of a direct current source are greater than or equal to a bottom value or less than or equal to a peak value of the carrier signal;
- generating first drive signals for respectively driving the plurality of switching elements so that a target output phase of a short-circuit mode for turning on a plurality of switching elements of a same output phase differs between a case of a state where all of the plurality of line-to-line current commands are smaller than the carrier signal and a case of a state where all of the plurality of line-to-line current commands are greater than the carrier signal;
- and
- generating second drive signals for applying the short-circuit mode to an output phase having the smallest absolute value of a phase voltage when the first drive signals are drive signals for applying the short-circuit mode, and switching the first drive signals to the second drive signals.
1 more element
A current source power conversion method including:
- current command correcting means for increasing or decreasing a plurality of line-to-line current commands with respect to a carrier signal so that all of the plurality of line-to-line current commands outputted to an inverter having a plurality of switching elements connected in series provided for each output phase between a positive terminal and a negative terminal of a direct current source are greater than or equal to a bottom value or less than or equal to a peak value of the carrier signal;
- signal generating means for generating first drive signals for respectively driving the plurality of switching elements so that a target output phase of a short-circuit mode for turning on a plurality of switching elements of a same output phase differs between a case of a state where all of the plurality of line-to-line current commands are smaller than the carrier signal and a case of a state where all of the plurality of line-to-line current commands are greater than the carrier signal;
- and
- selecting means for generating second drive signals for applying the short-circuit mode to an output phase having the smallest absolute value of a phase voltage when the first drive signals are drive signals for applying the short-circuit mode, and switching the first drive signals to the second drive signals.
1 more element
Dependencies are inferred from the claim text.