Title :
Spurious modulation on current-mode controlled DC/DC converters: an explanation for intermittent chaotic operation
Author :
Wong, S.C. ; Tse, C.K. ; Tam, K.C.
Author_Institution :
Dept. of Electron. & Inf. Eng., Hong Kong Polytech. Univ., China
Abstract :
We explain the mechanism that causes "intermittent" instability and chaos in a current-mode controlled switching converter. The circuit model used to study the phenomenon incorporates a coupling process through which a spurious signal is coupled to the current sensing and ramp compensation circuitry, resulting in a modulation of the compensation slope which causes the system to become unstable intermittently. We describe a way to find the parameter boundaries where intermittent chaotic operation emerges.
Keywords :
DC-DC power convertors; chaos; circuit stability; compensation; current-mode circuits; switching convertors; DC-DC converters; circuit model; compensation slope; coupling process; current sensing circuitry; current-mode control; current-mode controlled switching converter; intermittent chaotic operation; intermittent instability; parameter boundaries; ramp compensation circuitry; spurious modulation; spurious signal; switching power converters; Chaos; Clocks; Coupling circuits; DC-DC power converters; Inductors; Signal processing; Switches; Switching converters; Switching frequency; Uniform resource locators;
Conference_Titel :
Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on
Print_ISBN :
0-7803-8251-X
DOI :
10.1109/ISCAS.2004.1329942
