Trapezoidal PWM with Direct Modulation Technique (TPWM-DM) Using a Low Cost Microcontroller with High Signal Quality for Power Inverters

This paper presents a high signal quality PWM modulation technique for power inverters that can be implemented by means of a low cost microcontroller. The proposed modulation technique is a mixture between generated and calculated techniques that allows the voltage and frequency of the output signal to be modified on line within a broad margin. Moreover, the quality of the signals generated exceeds that of already existing modulation techniques; hence, better performance is achieved in the system as a whole, reducing the size of the filters at the inverter output which represents an important cost reduction. Additionally, the implementation by means of a low cost microcontroller helps to reduce the cost of the final application.