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In this paper, it is shown that the use of random uniform dither in harmonics measurement can significantly shorten the word of applied A/D converter and shorten the word of applied base function (sine and/or cosine), stored in memory, without accuracy loosing. This fact enables design of simple instrument for harmonics measurement. It is proven theoretically, by simulation and by experiment that 6-bit dithered A/D converter word, 8-bit dithered base function word, and 6 x 8 (14-bits) multiplier word assure measurement of 16 harmonics (16 sine and 16 cosine components) with 13-bit accuracy. Putting n such simple devices in parallel it is possible to measure n x 16 harmonics simultaneously. The measurement of 1 x 16 harmonics is realized in the small PLD chip.

SUMMARYThis paper describes the bifurcation phenomena of a system of parallel-connected d.c.=d.c. boost converters. The results provide important information for the design of stable current sharing in a master-slave conÿguration. Computer simulations and experiments are performed to capture the e ects of variation of some chosen parameters on the qualitative behaviour of the system. In particular, it is found that variation of some parameters leads to Neimark-Sacker bifurcation. Analysis is presented to establish the possibility of the bifurcation phenomena.

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