PWM generation using a TMS320C30 digital signal processor

摘要

When designing a control scheme for power electronic devices such as switch-mode power converters, the generated control signal must be pulse-width modulated (PWM) in order to apply the appropriate duty cycle to the switching transistor of the converter. Many modern digital signal processors (DSP) have the ability to pulse-width modulate multiple signals while performing complex algorithms. Unfortunately, the costs of these advanced processors often prevent designs from being economically feasible. This research investigates the use of a relatively inexpensive processor to simultaneously perform the control algorithm calculations and the PWM generation, making DSP-based switching converter control more cost effective. Specifically, this research implemented a state-space control algorithm using a TMS320C30 DSP Evaluation Module (EVM) to regulate the output voltage of a buck-topology switching converter with a 12-volt source and a 5-volt desired output. Implemented designs were observed for their transient and steady-state responses.