| 摘要 |
A current-sharing multiphase sliding-mode switching power supply ( 24 ) and method of operation are presented. A bipolar power source ( 22 ) is coupled to a switch ( 30 ) for each phase ( 28 ), each switch ( 30 ) is in turn coupled to an inductance ( 32 ), and a capacitance ( 36 ) is coupled to the inductances ( 32 ) and across a load ( 26 ). A sliding-surface generator ( 78 ) generates a sliding surface (sigma). A current-balance control ( 80 ) computes a reference current as a summary statistic (I<SUB>X</SUB>) of inductive currents (I<SUB>L</SUB>) through the inductances ( 32 ), calculates an error current (I<SUB>E</SUB>) for each phase ( 28 ) as a difference between the summary statistic (I<SUB>X</SUB>) and the inductive current (I<SUB>L</SUB>), and adjusts the sliding surface (sigma) for each phase ( 28 ) so that all inductive currents (I<SUB>L</SUB>) are substantially equal to the summary statistic (I<SUB>X</SUB>). A switching circuit ( 138 ) switches the switches ( 30 ) in response to the sliding surface (sigma).
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