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IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, VOL. 51, NO. 5, SEPTEMBER/OCTOBER 2015
學
生： 張正賢
指導教授： 王明賢
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Abstract
Introduction
Conventional Current Limit Strategy
DC-Link Current Sampling Scheme
Simulation And Experiment
Conclusion
References
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once the capacitance is reduced, reversal dclink current will lead to excessive voltage rise
in the dc link when conventional current limit
strategy is used.
Then, an improved current sampling scheme
is presented to replace the cycle-by-cycle
mode, which induces failure of current
limiting after the elimination of reversal
current
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Stable dc link is of great importance for the
smooth operation of brushless dc motor
(BLDCM) drives.
In order to suppress the fluctuation in dclink voltage, a conventional method is to
equip the dc link with sufficient capacitance,
which acts as an energy buffer between the
three-phase voltage source inverter (VSI) and
dc supply.
an integrated current limit strategy involves 4
aspects:
 current sensing
 recognizing over current event
 turn off logic
 re-enable action after the vanishing of over
current
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In order to avoid excessive pumping up in
dc-link voltage, the traditional all-turn-off
current limit logic is replaced by half-turn-off
logic,which can eliminate the reversal dc-link
current.
half-turn-off logic presented in this paper is
effective for the elimination of reversal dclink current during current limiting.
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