Design and Implementation of a Digital PWM Controller for a High-Frequency Switching DC-DC Power Converter
This paper describes complete design and implementation of a digital controller for a high-frequency switching power supply. Guidelines for the minimum required resolution of the analog-to-digital converter, the pulse-width modulator, and the fixed-point computational unit are derived. A design example based on a buck converter operating at the switching frequency of 1MHz is presented. The controller design is based on direct digital design approach and standard root-locus techniques. Experimental results are shown to validate the design approach and the allocation of resources (resolution) in the implementation.
It can be expected that digital controllers will be increasingly used even in low-to-medium power, highfrequency switching power supplies where conventional analog controllers are currently preferred because of cost and performance reasons. This paper addresses practical design and implementation of a digital controller for a power supply that operates at the switching frequency of 1MHz. Attention is given to the digital implementation with limited resources in terms of resolution of A/D and D/A (PWM) blocks and the time available to perform the required computations
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