All Questions
Tagged with dc-dc-converter power-electronics
278 questions
0
votes
2
answers
37
views
Impact of Input Capacitor on the Derivation of the Small-Signal Model of the Buck-Boost Converter
I have been studying the control methods of DC/DC power converters over the past couple of weeks and am confused on how the addition of an input capacitor affects the small-signal model of the buck-...
2
votes
3
answers
295
views
How to Keep a Constant Output Voltage While Using MPPT?
I wanted to design a solar energy management system that utilizes a 12-volt, 60-watt solar panel to charge two 12-volt, 12 Ah batteries efficiently. The system is aimed at optimizing energy storage ...
- 31
0
votes
0
answers
74
views
How to Measure the Frequency Response of a Circuit with Current Feedback Using Bode 100?
I want to use the Bode 100 Vector Network Analyzer to measure the frequency response of my circuit. I understand that with voltage feedback, a typical injection transformer can be used at the feedback ...
- 89
0
votes
1
answer
48
views
Can a boost converter output different voltage levels according to the reference voltage?
Is it possible to design a boost converter such that the boost converter outputs different voltage levels according to a reference value?
- 165
1
vote
0
answers
50
views
Mode Switching Challenges in MPPT and CC-CV Converters for Battery-to-Battery Charging
This project involves the design of a system that enables energy storage and transfer between two 12V, 12Ah batteries using a solar panel as the energy source. The system utilizes a 12V, 60W solar ...
- 31
0
votes
1
answer
58
views
Forced CCM Buck Operation
I bit confused regarding ripple voltage comparison for forced CCM mode buck converter and asynchronous buck converter in DCM. Which case we will have higher ripple voltage?
Next question, when should ...
- 119
0
votes
1
answer
57
views
Trying to build a buck converter with LM2576 Adjustable
I'm trying to build 12V buck converter based on this schematic
this is what I did
Is this already good enough, or does it need some more change?
this is my first trying to build something like this ...
3
votes
0
answers
99
views
Applicability of averaging to LLC resonant converter
I have read conflicting reports on the applicability of the averaging technique to LLC resonant converters:
On one hand on Microchip’s App Note 1477 “Digital Compensator Design for LLC Resonant ...
0
votes
0
answers
41
views
Resetting my current sense transformer
I have a 1:100 (11 µH secondary inductance) current sense transformer. My primary side input voltage is 800 V and the current is 5 A, Fsw= 100 kHz. I have good ole diode and reset resistor to reset my ...
0
votes
1
answer
84
views
Dual Buck inverter confusion
I am having a slight confusion in the dual buck converter as given in the paper. This is a model for a PV inverter. This initially has a voltage DC-DC converter that maintains the bus voltage.
What ...
- 693
3
votes
1
answer
205
views
Can I use a forward transformer in a flyback converter circuit?
I'm working on a power supply project and was wondering if it's possible to use a transformer designed for a forward converter in a flyback converter circuit.
I understand that these two topologies ...
- 161
2
votes
1
answer
74
views
How to choose the right PMOS for inrush limiting application
I have a DCDC Buck-Boost converter circuit that needs inrush protection. I have looked around the internet and the resources for a viable solution and decided to use the following circuit from this ...
0
votes
2
answers
125
views
Maximizing power transfer from 50Hz AC line via toroidal current transformer
This paper looked at ways of achieving high power-to-weight ratio for harvesting power from a 50Hz overhead line.
https://findresearcher.sdu.dk/ws/portalfiles/portal/250674676/...
0
votes
0
answers
36
views
plecs simulation of output impedance of switched capacitor(SC) converters
I am trying to simulate how output impedance of several DC/DC switched capacitor converters(dickson, ladder, and series-parallel) changes as switching frequency increases.
I referred to several papers;...
5
votes
5
answers
1k
views
How does MPPT maintain a constant voltage?
I have a slight confusion in the working of the MPPT algorithm in solar inverter. I am confused about how this converter maintains a constant 310V (required for H-bridge) with MPPT. MPPT is a maximum ...
- 693
2
votes
2
answers
214
views
Calculating junction-to-ambient temperature rise for switching MOSFET
So I'm looking at datasheet's since I'm looking for a N-Channel MOSFET for a DC-DC Buck Converter that will be switching at 1.2MHz. Since the MOSFET will be used as a switch for the Buck Converter, I ...
- 275
0
votes
0
answers
124
views
Middlebrook Stability Criteria for Input Filter
I am trying to apply Middlebrook input filter stability criteria for Active clamp forward converter .So for finding Input filter output impedance over the frequency range is quite straight forward in ...
- 119
1
vote
1
answer
77
views
Average Model of Peak Current Mode Buck Converter
I am trying to understand average model of Buck Converter for Peak Current Mode Control Topology. Below is a snapshot taken from the Christophe Basso Webpage, from file “PWM Switch LTspice: Mark ...
- 119
0
votes
1
answer
98
views
Peak Current Mode Control Buck Converter Slope Compensation Info From datasheet
I am working on Buck Converter design based on LT8642S controller and trying to do average modelling ,so I contacted manufacturer regarding slope compensation info and they responded below.
"The ...
- 119
0
votes
1
answer
125
views
Buck Converter Peak Current Mode Control Average Model
I am trying to understand average model of Buck Converter for Peak Current Mode Control Topology.
Below snapshot taken from Christophe Basso Webpage(https://powersimtof.com/Spice.htm) from file "...
- 119
1
vote
3
answers
141
views
Kapton instead of air gap (ferrite core)
I'm working on a flyback converter topology and I want to create a 1 mm air gap in the ferrite core transformer in order to decrease AL. I didn't find one with air gape, I heard of a solution that is ...
3
votes
1
answer
83
views
A question of control of flyback converters
Considering control of flyback converters, is it possible to control a converter which has pure current load (configuration on the picture)? Does it have to always be purely resistive load, because I'...
1
vote
1
answer
61
views
Calculate Li-ion discharge time for two different loads, one after the other
Battery: 2S (2 cell), 7.4 V nominal, 3000 mAh, and 8C max.
CC LED driver: TPS92691
LED string 1 (in series):
I(f) = 1.5 A CC @ V(f) 17 V
As simulated through WEBENCH, the input current required at ...
- 417
0
votes
1
answer
73
views
Can one CC boost LED driver be used for 2 different loads separately?
I have a constant current boost LED controller (TPS92691) which I am designing to output 4A switching between two LED strings. This is with a 2S lipo battery. One string has a stack forward voltage of ...
- 417
0
votes
2
answers
62
views
Does a current sense resistor not always mean a constant current output for dc-dc converter?
I've had a understanding that having a current sense resistor feeding into sense pins or a feedback pin meant that the inductor current was changing wrt the variations across sense resistor, hence ...
- 417
0
votes
1
answer
25
views
Apart from MOSFET selection what else determines max output current for LED controller IC?
TPS92691 is a LED controller, not a monolithic IC which has an integrated FET. Hence, I'm curious why the landing page for this part (https://www.ti.com/product/TPS92691) mentions that Iout(max) is 5A ...
- 417
3
votes
1
answer
268
views
What does "Single-Ended Primary Inductor" mean?
SEPIC stands for Single-Ended Primary Inductor Converter. Could anyone explain what "Single-Ended Primary Inductor" means in this context?
(Image from schematic of SEPIC in wikipedia here)
- 270
2
votes
5
answers
461
views
What is the correct definition of a floating output DC-DC converter?
This is what Dave Tweed wrote in his post here about a floating power supply:
It simply means that the output side of the power supply is completely isolated from the input side, not even sharing a ...
- 270
1
vote
3
answers
134
views
For a high powered LED loads, is a buck or boost converter more efficient / simpler?
I have a 3 high powered LEDs hooked up into a strip to for the load. For simplicity, I am going with a constant voltage driver. The load can be hooked up in 2 configurations:
Config 1:
3 Green LEDs (3....
- 417
0
votes
0
answers
39
views
Switching Freq. and Output voltage error
Attached is the datasheet for the Synchronous Buck Controller: https://www.ti.com/lit/ds/snvsb32b/snvsb32b.pdf?ts=1711536038118&ref_url=https%253A%252F%252Fwww.ti.com%252Ftool%252FLM5145EVM-HD-20A
...
- 295
0
votes
0
answers
96
views
Oring Diodes: is RC discharge circuit needed for prevent disconnection issue?
I have a new design implemented with oring diodes circuit as shown in picture below, where I have POE_VIN_24V coming from POE+ Module, and PHNX_DC_IN coming from phoenix connector, that is connected ...
- 1,097
0
votes
0
answers
45
views
Current Mode Control
I am referring the doc https://www.venableinstruments.com/current-mode-control-wp and trying to understand behavior of current mode control but unable to understand following things
1.
What is the ...
- 119
-1
votes
1
answer
94
views
Forward converter current flow confusion
I am slightly confused about the flow of the current in the forward converter during the turn off time of the MOSFET (when diode on left is conducting) as shown below. Now I am considering that n1=n2=...
- 693
1
vote
0
answers
78
views
SIMPLIS (Elements version) - PWL Topologies Error Dialog Box = Annoying
Within the free version of SIMPLIS, there is an example "LLC_HALF_BRIDGE_CONVERTER". I can't seem to share the file, but it's free and anyone who downloads SIMPLIS has access to it. The ...
- 180
3
votes
4
answers
365
views
How to add a current limit for a dual rails power supply?
I want to make an adjustable power supply with -18 V and 18 V separately adjustable outputs. I found this circuit might be the best and simplest one to do the job.
How can I limit the output current ...
- 366
0
votes
1
answer
43
views
Do solid state phased arrays need isolated power supplies?
Non-isolated DC/DC supplies could have higher power density but it seems that high power solid state phased arrays utilize mostly isolated DC/DC converters to power each of their amplifiers.
Why are ...
- 346
2
votes
1
answer
63
views
Buck converter inductor waveform having high ripple and slow charging and fast discharging [closed]
The following shows the voltage (green) and current waveform (yellow) across an inductor in a buck converter designed to step down 30 V to 15 V with 0.2 A output current.
The inductor values according ...
1
vote
1
answer
134
views
Transformer design and calculations
I am trying to find correct way of determining the transformer parameters.
I provided a simple schematic of a PSFB (phase-shifted full bridge) converter below.
How do we determine thr primary ...
- 730
0
votes
1
answer
56
views
What's the best method to design an adjustable power supply with 0-240V output? [closed]
I need to design a power supply for a DC shunt motor that has 240v,1.75A armature current, and 0.2A excitation current.
I was wondering which is the easiest/reliable method to design the power supply, ...
- 366
4
votes
1
answer
252
views
Push-Pull DC converter - resonance in the waveform
I'm building 48v to 200v Push-Pull DC converter.
And now I'm close to finishing the project, but when I checked the waveform on the transformer I discovered that it looks like this:
(on this picture ...
0
votes
1
answer
161
views
AP63203 Buck not working
Recently I have been experimenting with the AP63203, and I just have not been able to get it to output 3.3V successfully. Currently, the way I have been testing it is using an SMT to TH adapter, which ...
- 1
0
votes
1
answer
142
views
Multiple DC/DC or single DC/DC + LDO
My FSAE team and I are developing the electronic boards for the car, like BSPD, TSAL, etc.
So far, we use a 24V battery for low voltage system with a single DC/DC 24V to 5V converter for each board, ...
- 61
0
votes
1
answer
158
views
DC-DC buck converter's MOSFET or IGBT?
Motor Specifications:
Rated power: 50 kW
Rated voltage: 200V DC
Rated current: 250A
Battery Specifications:
Nominal voltage: 400V DC
Capacity: 50 kWh
Design Requirements of the DC-DC Converter
...
0
votes
1
answer
121
views
Problem with the output of a synchronous non-inverting buck-boost converter
I found this electronic circuit in an old research, along with the code necessary to operate it. When I applied it in the laboratory, the results were not the same as in the original research, not ...
- 13
0
votes
1
answer
90
views
Boost converter output instability
I'm currently working on a DC-DC boost converter project and encountering this issue where the output initially peaks but falls back to the input voltage. My desired output is around 140 V.
I'm using ...
1
vote
0
answers
80
views
High power dc/dc converter (or voltage clamping) with high source impedance
Short version:
I have a DC voltage source (adjustable up to 750 V 60 A) that is powering our robot which expects 320 V nominal (never exceed at 360 V) and can consume up to 30-35 A (but only 30 mA ...
- 8,118
0
votes
0
answers
27
views
Inductor based or switched capacitor DC-DC converter for given load parameters for mouse's headstage
For my master's thesis project, which focuses on designing a control loop for a DC-DC converter in the receiver of a resonant inductive coupling system to handle significant and unpredictable ...
- 113
0
votes
0
answers
55
views
Step Up power (from 0.02-0.6 DC V input to 5-12 DC V output) I need a suggestion [duplicate]
I want to design a DC-DC converter to have a power supply that can charge an electronic device.
The issue behind in that the expected input range is 0.04-0.6 V DC. I chose both MT3608 and LTC3108.
The ...
- 21
1
vote
1
answer
199
views
Stepping Up power (from 0.02-0.6 DC V input to 5-12 DC V output)
I want do design DC-DC converter to have a power supply that can charge an electronic device.
The issue behind in that the expected input range is 0.04-0.6 V DC. I chose both MT3608 and LTC3108.
My ...
- 21
2
votes
1
answer
407
views
Push-pull and flyback converter topologies dead time confusion
I am having a slight confusion regarding the flow of the currents in the push-pull and full-bridge during the dead time. Considering a
push-pull converter during the ON and dead time.
Image Link
In ...
- 693