Sampling control theory have an important conclusion: the same impulse and different shapes of the narrow pulse increases with the inertia of the link, its effect is basically the same. PWM control technique is the theoretical basis for the conclusion of the semiconductor switching device and the on-off control, so that the output has been a series of equal amplitude and pulse width are not equal, use the pulse to replace the sine wave or other by waveform needs. PWM of the developers do not understand very helpful.

PWM.doc

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