scholarly journals Exact Dynamic Modeling of PWM DC-to-DC Power Converters—Part II: Discontinuous Conduction Mode

2021 ◽  
Vol 09 (05) ◽  
pp. 48-62
Author(s):  
Justin Simmons ◽  
Richard Tymerski
Keyword(s):  
Dynamic Modeling ◽  
Power Converters ◽  
Discontinuous Conduction Mode ◽  
Dc Power ◽  
Conduction Mode

Averaged models of pulse-modulated DC-DC power converters. Part I. Discussion of standard methods

2012 ◽  
Vol 61 (4) ◽  
pp. 609-631 ◽  
Author(s):  
Włodzimierz Janke
Keyword(s):  
Power Converters ◽  
Standard Methods ◽  
Practical Applications ◽  
Dc Power ◽  
Switch Mode ◽  
Model Derivation ◽  
Averaged Models ◽  
Averaged Model ◽  
Conduction Mode ◽  
The Ideal

Abstract The averaged models of switch-mode DC-DC power converters are discussed. Two methods of averaged model derivation are considered - the first, based on statespace averaging and the second, on the switch averaging approach. The simplest converters: BUCK, BOOST and BUCK-BOOST working in CCM (continuous conduction mode) or DCM are taken as examples in detailed considerations. Apart from the ideal converters, the more realistic case of converters with parasitic resistances is analyzed. The switch averaging approach is used more frequently than the other and is believed to be more convenient in practical applications. It is shown however, that in the deriving the averaged models based on the switch-averaging approach, some informalities have been made, which may be the source of errors in the case of converters with parasitic resistances, or working in DCM mode.

A New Approach to the Discontinuous Conduction Mode in Switching Power Converters

2010 ◽  
Vol 47 (2) ◽  
pp. 168-173
Author(s):  
Predrag Pejović
Keyword(s):  
Output Voltage ◽  
Teaching Practice ◽  
Power Converters ◽  
Teaching Method ◽  
Switching Converters ◽  
Output Current ◽  
Switching Power ◽  
Discontinuous Conduction Mode ◽  
Switching Power Converters ◽  
Conduction Mode

The discontinuous conduction mode in switching power converters is addressed in the paper. Instead of assuming that the load is a linear resistor, an equation is derived that relates the output current to the output voltage and other circuit parameters. Closed-form expressions that relate the output current to the output voltage and the other circuit parameters are obtained for all three of the basic switching converters: buck, boost, and buck–boost. The results obtained apply regardless the load type. To simplify notation, normalization of the output current and the output voltage is introduced. The proposed teaching method has been verified in teaching practice.

scholarly journals Small-signal input characteristics of step-down and step-up converters in various conduction modes

2016 ◽  
Vol 64 (2) ◽  
pp. 265-270 ◽  
Author(s):  
W. Janke ◽  
M. Walczak
Keyword(s):  
Low Frequency ◽  
Laboratory Model ◽  
Small Signal ◽  
Input Admittance ◽  
Discontinuous Conduction Mode ◽  
Dc Power ◽  
Signal Input ◽  
Analytical Formulas ◽  
Averaged Models ◽  
Conduction Mode

Abstract Small-signal input characteristics of BUCK and BOOST DC-DC power converters in continuous conduction and discontinuous conduction mode have been presented. Special attention is paid to characteristics in discontinuous conduction mode. The input characteristics are derived from the general form of averaged models of converters. The frequency dependence of input admittance and other input characteristics has been observed in a relatively low-frequency range. The analytical formulas derived in the paper are illustrated by numerical calculations and verified by experiments with a laboratory model of BOOST converter. A satisfying level of conformity of calculations and measurements has been obtained.

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