Method and apparatus for mitigation of DC bus pump-up
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United States of America Patent
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Jun 8, 2021
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N/A
app pub date -
Jan 24, 2020
filing date -
Jan 24, 2020
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Abstract
A modulation routine in a motor drive under lightly loaded conditions which prevents DC bus voltage pump-up includes both active states and zero states. In a first zero state, each phase of the motor is connected to a negative rail of the DC bus, and in a second zero state, each phase of the motor is connected to a positive rail of the DC bus. When motor is lightly loaded or unloaded such that DC bus voltage pump-up may occur, the two zero states are utilized in an uneven manner. The specific division of the zero state between the first and second zero states may be selected in a manner that prevents the DC bus voltage pump-up from occurring.
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