Hysteretic current control method and an uninterruptible power supply using same
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United States of America Patent
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Apr 20, 2004
Grant Date -
Aug 1, 2002
app pub date -
Jan 26, 2001
filing date -
Jan 26, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Presented is a control system and method for minimizing the adverse affects resulting from conventional hysteretic current control of power inverters, and an uninterruptible power supply using same. The system of the present invention uses control circuitry for monitoring and classifying the PWM switching events commanded by conventional hysteretic current control and adjusting the dead time delay injected based on these PWM events. Preferably, the control circuitry uses a minimum delay dead time component to preclude the possibility of a shoot through condition from occurring, and also includes a frequency control component of the total dead time delay. In one embodiment this frequency control component may vary in proportion to the switching frequency commanded by the hysteretic current control loop. In an alternate embodiment, the PWM switching events are classified into differing modes of operation, during which a particular fixed frequency control dead time delay is selected. The control of the present invention may also use a maximum difference current control limit for the dead time delay to preclude excessive output current swings beyond the typical hysteretic current control limits.
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