Sampling control theory has an important conclusion: the impulse is equal but different shapes of narrow pulses added to the inertia of the link, the effect is basically the same. PWM control technique is to this conclusion based on the theory of the semiconductor switching device on and off to control the output side by a series of equal amplitude and pulse width are not equal, with these pulses instead of sine wave or other needs. according to certain rules of the pulse width modulation, can change The size of inverter output voltage can also change the output frequency.

PWM CONTRL METHOD.doc

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