Abstract
In the paper output voltage ripples (OVR) of switching frequency modulated (FM) boost switch-mode power converter (SMPC) operating in discontinuous conduction mode (DCM) are examined thoroughly. Useful expressions to calculate OVR for closed-loop boost SMPC operating in DCM are derived and verified both using simulations in SIMULINK and experimentally. Influence of parameters of modulation and control signals on OVR is also examined. The results presented in the paper can be helpful when designing FM SMPC operating in DCM. Ill. 7, bibl. 12, tabl. 1 (in English; abstracts in English and Lithuanian). DOI: http://dx.doi.org/10.5755/j01.eee.122.6.1819
Highlights
Switch-mode power converters (SMPC) are very popular today mainly because of higher efficiency and smaller size
DCM sometimes is chosen to be the main mode of operation of SMPC, mainly, due to feedback loop stability considerations [4, 11, 12]
output voltage ripples (OVR) can be analyzed and calculated using the expressions derived in the paper
Summary
Switch-mode power converters (SMPC) are very popular today mainly because of higher efficiency and smaller size. They are used in switch-mode power supplies, battery chargers, active power factor correctors, etc [1,2,3]. SMPC can operate in both continuous and discontinuous conduction modes (CCM and DCM respectively). The main mode of operation is usually CCM, in which power inductor current never falls to zero. DCM sometimes is chosen to be the main mode of operation of SMPC, mainly, due to feedback loop stability considerations [4, 11, 12]. In this paper OVR of FM boost converter operating in DCM will be considered and influence of modulation parameters on OVR will be examined.
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