|Autors: Tomov, V. T., Iliev, I. T., Krasteva, V. T.|
Title: High resolution FPGA pulse width modulation control of full-bridge DC–DC converters
Keywords: PWM, DC-DC converters
Abstract: This study describes a field-programmable gate arrays (FPGAs) based technique, which aims to significantly improve the resolution of complementary drivers in full-bridge DC–DC converters. An algorithm for precise adjustment of both the duty cycle and the frequency of the pulse width modulator (PWM) is presented. It is experimentally verified by software simulation and FPGA hardware implementation. The results prove that the designed 12-bit digital PWM is able to provide switching frequency of 100 kHz in the range of 99.61 [99.51–99.70] kHz [mean value (95% confidence interval)] using clock frequency of just 160 MHz. In comparison, the conventional counter-based PWM gives the same output resolution at operating frequency of 410 MHz. In addition, the proposed algorithm is scalable and could be used to provide better resolution even at higher clock frequencies >400 MHz.
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