| 摘要 |
A sliding-mode switching power supply ( 24 ) having N phases ( 28 ) and a method of operating the power supply ( 24 ) are provided. N switches ( 30 ) are coupled to a bipolar power source ( 22 ), with each switch ( 30 ) effecting one phase ( 28 ). An inductance ( 32 ) is coupled to each switch ( 30 ), and a capacitance ( 36 ) is coupled to the inductances ( 32 ). A load ( 26 ) is coupled across the capacitance ( 36 ). A monitor circuit ( 38 ) is coupled to the inductances ( 32 ) and the capacitance ( 36 ) and configured to monitor an output voltage (V<SUB>Out</SUB>) of the power supply ( 24 ). A first state-variable generator ( 42 ) generates a first state variable (first state variable x<SUB>1</SUB>) in response to the output voltage (V<SUB>Out</SUB>), and a second sate variable generator ( 44 ) synthesizes a second state variable (second state variable x<SUB>2</SUB>) from the first state variable (x<SUB>1</SUB>). A feedback-signal generator ( 46 ) is coupled to the first and second state-variable generators ( 42, 44 ) and generates a comprehensive feedback signal (sigma) for all phases ( 28 ) using only the two state variables (x<SUB>1</SUB>, x<SUB>2</SUB>).
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