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A novel topology of delta modulator for static PWM inverter
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| Author(s) |
C.Choochuan; V. Tipsuwanporn; V. Pirajnanchai |
| Abstract |
This paper presents a new topologies of delta modulator (DM) for static
PWM inverter application and an improved inverter waveform of delta modulation. The tuned
and the multi-integrator DM are the two schemes proposed for PWM waveform synthesis so
far[2]. The methods were found useful for variable speed PWM inverter-fed ac drives and
minimization of harmonic in delta modulated inverters. However it was observed that during
tuning and filtering process, fundamental output voltage of the inverter reduced. With an aim to
overcome this effect, a new topologies of delta modulator which combines the advantageous
features of both the variable slope of integrator and variable hysteresis window DM in one
modulator is proposed. Pulse-width modulation (PWM) signals are synthesized by using R-C
multivibrator base. Therefore, the proposed DM consisted a few component and another achieved
objective are minimized of control circuit complexity. The topologies has the capability to
maintain a constant fundamental voltage of the output waveform of the inverters and the PWM
switching frequency to be near constant for all PWM pulses at any amplitude reference signal.
The performance and cost of this modulator is better than other DM topologies so far reported.
Experimental results confirming the feasibility of the proposed modulator. |
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| Filename: | EPE2003-PP0623 - Choochuan |
| Filesize: | 431.5 KB |
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| Type |
Members Only |
| Date |
Last modified 2003-10-24 by Unknown |
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