All Questions
Tagged with modeling switch-mode-power-supply
14
questions
0
votes
0
answers
42
views
How can a power converter small signal model predict transient behaviour during a load step which is a large signal disturbance?
I see small signal model being used to predict the Overshoot/Undershoot of output voltage due to a load step.
How do we justify this approach, since the basic assumption of small signal modelling is ...
- 3,032
3
votes
2
answers
139
views
Is there a way to take this buck diagram and reduce it to an AC transfer function?
I am semi-dangerous with switchers but I've never really delved into the innards of them so I'd like to ask about this TPS23750 diagram. I would like to develop a model of this feedback loop of a buck ...
- 84.8k
1
vote
1
answer
54
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Modeling first-order dynamics of a switching converter
I have created a simple, first-order model of a switching regulator in steady state (it's basically a transformer with a loss element). Its only parameters are desired output voltage \$V_o\$ and ...
- 1,326
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votes
2
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142
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How does current flow in this circuit with multiple power regulators?
I have the following circuit:
simulate this circuit – Schematic created using CircuitLab
U1 contains two voltage regulators (Vo1=+10V, Vo2=-10V, input Vin=5V). (These could be buck, boost etc. ...
- 1,326
2
votes
2
answers
964
views
Different levels of SPICE models
I wanted to model some components operated in a switching boost power converter at LTspice and i realized that different levels are available for power mosfets.
Do all components have different levels ...
- 735
1
vote
4
answers
267
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Loss-free resistor model
Can someone use a simple explanation to tell me what a loss-free resistor model is? I googled it but it is hard to understand. When I study power factor correction circuits, I see some papers use this ...
- 413
0
votes
2
answers
4k
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Average PWM Switch Model
I'm trying and want to learn how to use the PWM Switch Model by DR.Vorpérian , both for the voltage mode(VM) and current mode (CM) model.
I've read some about the models in "Switched-mode power ...
- 626
0
votes
1
answer
611
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Derivation for average value input current in buck-boost converter
I am struggling with the derivation of average value of input current as below.
The image is from the lecture here (page 26).
Here is what I got so far.
How did the lecture derive the final step here?...
- 1,649
0
votes
2
answers
1k
views
hamonics and sidebands in dc-dc converter
The lecture (page 8) shows output voltage spectrum with sinusoidal modulation of duty cycle of a dc-dc converter.
I am wondering where the hamonics and sidebands come from.
For hamonics, I read ...
- 1,649
4
votes
3
answers
2k
views
Push current source through transfromer
This lecture (from page 130) shows manipulation of the buck-boost converter model into canonical form.
I am stucked at moving current source through transformer as in the picture below or from the ...
- 1,649
1
vote
1
answer
559
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ac model for buck-boost converter
This lecture shows how to create ac model for buck-boost converter.
What I am confused is the equivalent circuit model for inductor loop equation
on page 38.
As you can see from the model, there ...
- 1,649
10
votes
3
answers
1k
views
What causes this knee in my MOSFET drain voltage drop?
FINAL UPDATE: Understand a previously mysterious power MOSFET switching waveform wiggle! @Mario uncovered the root cause here below, distinctive to so-called VDMOS devices, typical of many power ...
- 7,172
0
votes
1
answer
282
views
Transient analysis of a step down converter with control loop
I am trying to run a transient simulation of a step down dc-dc converter using ideal components. This includes a feedback loop consisting of an error amplifier. I am interested in transient response ...
- 887
1
vote
1
answer
498
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AC-model of Integrated Boost-Flyback converter
I am designing a small SMPS to light a few Nixie tubes from an ordinary USB charger. This requires a high voltage gain around 40 which disqualifies many of the typically used topologies. I have grown ...
- 7