Random switching frequency in a synchronous-asynchronous digital voltage-mode control for dc-dc converters
作者： D. Trevisan , P. Mattavelli , S. Saggini
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摘要: This paper investigates the application of a random carrier-frequency pulse width modulation technique to mixed synchronous/asynchronous digital voltage-mode controller for dc-dc converters presented in (Trzynadlowski, 1999). In considered control architecture, turn-on switching event is determined asynchronously by comparing converter output voltage with synchronously generated ramp driven using low-resolution digital-to-analog (DAC). Switch turn-off system clock. this work, has been provided modulator which performs limited pool modulation; provision ensures low EMI emission and simple hardware implementation without affecting quality regulation. Experimental results on synchronous buck converter, where implemented field programmable gate array (FPGA), confirm effectiveness proposed solution
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