PWM-based AC signal effective value measurement method
A measurement method and AC signal technology, which is applied in the fields of instrumentation, signal processing and measurement and control, can solve the problems of high processor requirements, narrow application range, and no harmonics in sinusoidal signals, and solve problems containing DC components and harmonics , fast calculation speed and wide application range
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[0028] The invention provides a method for measuring the effective value of an AC signal based on PWM, which mainly uses the equivalent principle of PWM area. The equivalent schematic diagram of the PWM area is shown in figure 1 As shown, according to the principle of equivalent impulse in Chapter 8 of "Electromechanical Transmission Control" (Deng Xingzhong et al., Huazhong University of Science and Technology Press, fifth edition), it can be known that when two narrow pulses with equal impulses and different shapes are loaded on the inertial link, the effect same. Available, in [0, T s ](T s Small) time, if v(t)>0 exists:
[0029] ∫ 0 T s v ( t ) d t = V C C × T o n 0 - - ...
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