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A COMPERATIVE STUDY OF DELTA AND SINE PULSE WIDTH MODULATED INVERTERS
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| Author(s) |
M. A. Rahman; J. E. Quaicoe; M. A. Choudhury |
| Abstract |
This paper presents a brief analysis of a delta modulated (DM) and sine pulse width modulated inverter. The performances of two types of inverters are compared. Use of delta modulation in generating inverter switching waveforms has several advantageous characteristics over the sine pulse width modulation technique. Analog implementation of delta modulation is relatively easy. lt provides low harmonics at the inverter output and has easy control of the inverter output voltage, commutations and harmonic contents. Some features of delta modulation are very much desirable for variable voltage variable frequency ac drives. ln both sine and delta modulated inverters, the fundamental voltage increases linearly with the increase of frequency. But in the case of delta modulation, the inverter output has a transition from PWM mode to square wave mode of operation at high frequency. This feature may allow ac drives to operate in constant torque and constant power mode without additional controls in logic circuits. |
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| Filename: | Unnamed file |
| Filesize: | 2.548 MB |
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| Type |
Members Only |
| Date |
Last modified 2021-03-12 by System |
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