Equivalent circuits for averaged description of DC-DC switch-mode power converters based on separation of variables approach

2013 ◽  
Vol 61 (3) ◽  
pp. 711-723 ◽  
Author(s):  
W. Janke
Keyword(s):  
Power Converters ◽  
Circuit Simulation ◽  
Separation Of Variables ◽  
Equivalent Circuits ◽  
Small Signal ◽  
Large Signal ◽  
Dc Power ◽  
Measurement Results ◽  
Switch Mode ◽  
Averaged Models

Abstract Large-signal and small-signal averaged models of basic switch-mode DC-DC power converters: BUCK (step-down) and BOOST (step-up) are presented. Models are derived with the separation of variables approach and have the form of equivalent circuits, suitable for a circuit simulation. Apart from equivalent circuits, small-signal transmittances of converters for CCM and DCM modes are discussed. Parasitic resistances of all components of converters are taken into account. A few examples of simulations and measurement results of selected converter characteristics are also presented. It is shown, that neglecting parasitic resistances (often met in works of other authors) may lead to serious errors in an averaged description of converters.

Averaged models of pulse-modulated DC-DC power converters. Part II. Models based on the separation of variables

2012 ◽  
Vol 61 (4) ◽  
pp. 633-654 ◽  
Author(s):  
Włodzimierz Janke
Keyword(s):  
Power Converters ◽  
Averaging Method ◽  
Separation Of Variables ◽  
Small Signal ◽  
Large Signal ◽  
Dc Power ◽  
Switch Mode ◽  
Standard Models ◽  
Averaged Models ◽  
The Ideal

Abstract The separation of variables approach to formulate the averaged models of DC-DC switch-mode power converters is presented in the paper. The proposed method is applied to basic converters such as BUCK, BOOST and BUCK-BOOST. The ideal converters or converters with parasitic resistances, working in CCM and in DCM mode are considered. The models are presented in the form of equation systems for large signal, steady-state and small-signal case. It is shown, that the models obtained by separation of variables approach differ in some situations from standard models based on switch averaging method.

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.

scholarly journals A New Method to Extract Gate Bias-Dependent Parasitic Resistances in GaAs pHEMTs

Electronics ◽  
2019 ◽  
Vol 8 (3) ◽  
pp. 266
Author(s):  
Ruirui Dang ◽  
Lijie Yang ◽  
Zhihao Lv ◽  
Chunyi Song ◽  
Zhiwei Xu
Keyword(s):  
Parameter Extraction ◽  
New Method ◽  
Small Signal ◽  
Gate Bias ◽  
Large Signal ◽  
S Parameter ◽  
Proposed Model ◽  
Measurement Results ◽  
Parasitic Parameter ◽  
Signal Models

Accurate large signal GaAs pHEMT models are essential for devices’ performance analysis and microwave circuit design. This, in turn, mandates precise small signal models. However, the accuracy of small signal models strongly depends on reliable parasitic parameter extraction of GaAs pHEMT, which also greatly influences the extraction of intrinsic elements. Specifically, the parasitic source and drain resistances, R s and R d , are gate bias-dependent, due to the two-dimensional charge variations. In this paper, we propose a new method to extract R s and R d directly from S-parameter measurements of the device under test (DUT), which save excessive measurements and complicated parameter extraction. We have validated the proposed method in both simulation and on-wafer measurement, which achieves better accuracy than the existing state-of-the-art in a frequency range of 0.5–40 GHz. Furthermore, we develop a GaAs pHEMT power amplifier (PA) to further validate the developed model. The measurement results of the PA at 9–15 GHz agree with the simulation results using the proposed model.

scholarly journals Small-signal analysis of a single-stage bridgeless boost half-bridge AC/DC converter with bidirectional switch

2021 ◽  
Vol 12 (4) ◽  
pp. 2358
Author(s):  
Mohamad Affan Bin Mohd Noh ◽  
Mohd Rodhi Bin Sahid ◽  
Thang Ka Fei ◽  
Ravi Lakshmanan
Keyword(s):  
Steady State ◽  
Signal Analysis ◽  
Circuit Simulation ◽  
Single Stage ◽  
Small Signal ◽  
Large Signal ◽  
Signal Model ◽  
Matlab Simulink ◽  
Small Signal Analysis ◽  
Small Signal Model

A small-signal analysis of a single-stage bridgeless boost half-bridge alternating current/direct current (AC/DC) Converter with bidirectional switches is performed using circuit averaging method. The comprehensive approach to develop the small signal model from the steady state analysis is discussed. The small-signal model is then simulated with MATLAB Simulink. The small-signal model is verified through the comparison of the bode-plot obtained from MATLAB Simulink and the simulated large signal model in piecewise linear electrical circuit simulation (PLECS). The mathematical model obtain from the small-signal analysis is then used to determine the proportional gain K_p and integral gain K_i. In addition, the switch large-signal model is developed by considering the current and voltage waveforms during load transients and steady-state conditions.

Actuator circuits for the Complete Small Signal Characterization of DC/DC Power Converters

EPE Journal ◽  
2012 ◽  
Vol 22 (1) ◽  
pp. 13-19
Author(s):  
Marco Riva ◽  
Davide Giustina Della ◽  
Federico Belloni
Keyword(s):  
Power Converters ◽  
Small Signal ◽  
Dc Power ◽  
Signal Characterization

Large-signal and small-signal electronic equivalent circuits for a field electron emitter

2004 ◽  
Vol 36 (56) ◽  
pp. 402-406
Author(s):  
M. J. Hagmann ◽  
M. S. Mousa ◽  
M. Brugat ◽  
E. P. Sheshin ◽  
A. S. Baturin
Keyword(s):  
Equivalent Circuits ◽  
Small Signal ◽  
Large Signal ◽  
Electron Emitter ◽  
Field Electron
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