L6_2_1 - Improved Diode-Clamped Inverter The problem of...

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Improved Diode-Clamped Inverter The problem of multiple blocking voltages of the clamping diodes can be addressed by connecting an appropriate number of diodes in series, as shown in Figure. 15
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An improved version of the diode-clamped inverter Principle of operation. The modified diode-clamped inverter can be decomposed into two-level switching cells. For an m -level inverter, there are ( m-1 ) switching cells. Thus, for m =5, there are 4 cells: In cell 1, S 2 , S 3 , and S 4 are always on whereas S 1 and 1 S are switched alternatively to produce an output voltage V dc /2 and V dc /4 , respectively. Similarly in cell 2, , , and 3 S 4 S 1 S are always on whereas and are switched alternatively to produce an output voltage V 2 S 2 S dc /4 and 0, respectively. In cell 3, , 4 S 1 S , and are always on whereas and 2 S 3 S 3 S are switched alternatively to produce an output voltage 0 and V dc /4, respectively. In final cell 4, 1 S , 2 S , and 3 S are always on whereas and 4 S 4 S are switched alternatively to produce an output voltage – V dc /4 and – V dc /2 , respectively.
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This note was uploaded on 10/05/2011 for the course EECS 101 taught by Professor Hero during the Spring '11 term at National Taipei University.

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L6_2_1 - Improved Diode-Clamped Inverter The problem of...

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