PULSE-BASED DEAD-TIME COMPENSATOR FOR PWM VOLTAGE INVERTERS

The dead time necessary to prevent the short circuit of the power supp ly in pulsewidth-modulated (PWM) voltage inverters results in output v oltage errors, Although individually small, when accumulated over an o perating cycle, the voltage errors are sufficient to distort the appli ed PWM signal, This paper presents a method to correct for the dead-ti me errors, The pulse-based dead-time compensator (PBDTC) is less hardw are- and software intensive than other dead-time compensation methods providing a low cost solution, The pulse-based technique is developed by analyzing the effects of dead time on a pulse-by-pulse basis and co rrecting each pulse accordingly. The technique is evaluated through si mulation and experimental results, Other compensation methods are eval uated, and the results compared with the pulse-based technique, This c omparison indicates previous methods can produce magnitude and phase e rrors in the applied terminal voltage, whereas the proposed method com pensates for the dead time without significant magnitude and phase err ors in the terminal voltage of PWM voltage source inverters.