Journal
INTERNATIONAL JOURNAL OF BIFURCATION AND CHAOS
Volume 23, Issue 4, Pages -Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0218127413500624
Keywords
Bifurcation; constant current load; dc-dc converter; fast-scale instability; slow-scale instability; subharmonic oscillation
Funding
- National Natural Science Foundation of China [51177140]
- Fundamental Research Funds for the Central Universities [SWJTU11CX029]
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The complex dynamics and coexisting fast-slow scale instability in current-mode controlled buck converter with constant current load (CCL), operating in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM), are investigated in this paper. Via cycle-by-cycle computer simulation and experimental measurement of current-mode controlled buck converter with CCL, it is found that a unique fast-slow scale instability exists in the second-order switching converter. It is also found that a unique period-doubling accompanied by Neimark-Sacker bifurcation exists in this simple second-order converter, which is different from period-doubling or Neimark-Sacker bifurcations reported previously. Based on a nonlinear discrete-time model and the corresponding Jacobian, the effects of CCL and input voltage on the dynamics of current-mode controlled buck converter are investigated and verified theoretically. Fixed point analysis for slow-scale low-frequency oscillation is also given to verify the dynamics and the coexisting fast-slow scale instability.
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