Editing 3-level PWM vs 2-level PWM
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:The output of 3-level PWM are in-phase with each other which yields three distinct voltage levels of voltage differential over the load. The third voltage level is ''zero voltage'' which features lower current rate of change in the coil yielding lower total current ripple. | :The output of 3-level PWM are in-phase with each other which yields three distinct voltage levels of voltage differential over the load. The third voltage level is ''zero voltage'' which features lower current rate of change in the coil yielding lower total current ripple. | ||
==Simulated waveforms== | ==Simulated waveforms== | ||
− | These simulations display a case where one coil is being driven with 2 and 3 level PWMs | + | These simulations display a case where one coil is being driven with 2 and 3 level PWMs. All simulation parameters are kept same, only difference is the switching scheme. |
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===2-level PWM=== | ===2-level PWM=== | ||
[[File:Pwm2level m.PNG]] | [[File:Pwm2level m.PNG]] | ||
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The ripple reduction in the worst case is 1:4 and in the best case (zero output) it is reduced to zero. | The ripple reduction in the worst case is 1:4 and in the best case (zero output) it is reduced to zero. | ||
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