All Questions
Tagged with dc-dc-converter converter
119 questions
-1
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0
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42
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Cascading two boost converters [duplicate]
I have assembled a cascade converter circuit. My main goal is to accumulate a voltage of 80 volts on a C6 1000 µF capacitor in about 6-8 seconds. The problem is that I am using a 3.7 V battery. If I ...
0
votes
1
answer
78
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DC-DC converter step-up double stage cascade
i made a cascade dc converter using mc34063 but using an external transistor, my main goal is to charge the capacitor at the 2200uf output in about 5-8 seconds, the input voltage is 3.7 ideally when ...
0
votes
0
answers
33
views
DC-DC voltage converter design advice
I am planning to build a DC power source for EDM/plasma polishing.
Both processes require a DC power source with difference being that plasma polishing needs voltage to be 300 to 400 DC
and for EDM ...
- 1
3
votes
1
answer
245
views
Control to output transfer function
I am trying to derive control to output transfer function of phase shift full bridge converter.
Applying small signal analysis, I reach to the point/schematic as shown in the picture below:
Document ...
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0
votes
1
answer
163
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Phase shift full-bridge converter
During t3-t4, only Q3 is ON shown with black arrow.
On the bottom-right of the picture, primary voltage and primary coil current increases towards negative.
I don't understand how the primary ...
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0
votes
1
answer
44
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Duty Cycle Clamp
The application notes of phase shift full bridge converter states that ''the delay times need to achieve ZVS for MOSFETs can as a duty cycle clamp''. They have a calculation as given below.
The ...
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0
votes
3
answers
66
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Output Capacitor RMS current
The output capacitor used in the phase shift full bridge converter has RMS current calculation in the Texas document. Calculation is given below:
Source: https://www.lcsc.com/datasheet/...
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1
vote
2
answers
82
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TL494 - Darlington circuit
Below is an example diagram from the TL494 datasheet.
The maximum collector current of TL494 is 250 mA.
There is a calculation of the base current and R10 base resistance for Q1 (pnp) using the hfe ...
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0
votes
3
answers
71
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LT3757 - Boost converter
I have 3 simple question regarding the LT3757 ic.
I don't know how many amps it gives from the gate pin ? The only information about the gate is given below. I need to know it so that I can select my ...
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0
votes
2
answers
80
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Output Voltage Drop and Insufficient Current Consumption in a Full-Bridge DC/DC Converter
I assembled and tested the circuit shown in the schematic on a copper board. Without any load, I can achieve the desired output voltage of 400V. However, when I connect a 400W load, the output voltage ...
0
votes
1
answer
116
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Constant output voltage in buck-boost converters
I'm a self-taught student. I'm trying to understand the working principle of buck-boost converters in continuous conduction mode.
When the switch is turned on, the equation describing the inductor is ...
- 311
0
votes
1
answer
54
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RCD snubber loss in flyback converter
I have few queries in analyzing the curves. Below is the flyback converter with RCD snubber circuit and waveforms.
When the FET is turned ON, there is no primary current flowing through snubber as the ...
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3
votes
1
answer
266
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Boost converter does not work according to the theories
I am still a beginner in this field so I would like to gain some insight about boost converters. I wanted to build a boost converter for a school project with this simple design. The parts were ...
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0
votes
0
answers
45
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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
vote
1
answer
292
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Average Modelling of Buck Converter
I am doing Modelling of Buck Converter for LT3890 (Datasheet link attached) for Frequency response analysis .
I have some reference model of Buck converter ,please refer below image
Datasheet Link: ...
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0
votes
1
answer
199
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What is the relationship between the windings in a forward converter?
I'm trying to sketch the currents through each transformer winding of a forward converter. I also need to sketch the current through the source. I have a sketch of the current through the magnetizing ...
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1
vote
1
answer
134
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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 ...
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0
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0
answers
59
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DC-DC boost Converter for a motor load
To give some context I have a 250 watt DC motor It is powering an electric race car for a school race my class is competing in. The rules say I have to use a specific unmodified motor supplied by 2, ...
4
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9
answers
2k
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What options exist for isolating a high power DC analog signal? [closed]
I have a high power DC signal that can range from 0-325 VDC. The source is capable of delivering up to around 150 amperes at 325 volts. I need to monitor the voltage as an analog signal by reading it ...
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0
votes
1
answer
160
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Making DC-DC boost converter 3.7 to 8 V using MC34063
I am trying to make dc dc boost converter 3.9 to 8 V using:
mc34063
https://pdf1.alldatasheet.com/datasheet-pdf/view/12072/ONSEMI/MC34063.html
100 uF 16 V capacitor
220 uF 25 V capacitor
680 pF ...
- 465
2
votes
1
answer
1k
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Identify SMD DC-DC converter chip
I am trying to identify the DC-DC converter chip in the images below (two variants of the same PCB). Input (B1) is in the range of 20-60V and output is 12V. I have found devices from Torex Semicon ...
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0
votes
0
answers
47
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Low Side N-Channel 75V to 12V Buck Converter with feedback
I want to design a buck converter for E-bike with 75V input and 12V, 20A (240W ideal case) output to drive the other components of E-bike using n-mosfet as a low side.
I also want to use a feedback ...
1
vote
1
answer
259
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Buck converter simulation(Psim) always return the half value of the output voltage
I try to design a buck-converter in PSIM simulation program. Let me write the circuit's requirements:
Frequency = 80kHz
Ripple < 0.5%
\$V_{input}\$ = 30V
\$V_{out}\$ = 12V
\$R_{load}\$ = 10 \$\...
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0
votes
1
answer
129
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Change in switching frequency across gate source
I am working on a bidirectional half bridge DC-DC converter. The converter circuit is shown below.
I used a TLP250 IC for the driver circuit. A square wave with 20 kHz switching frequency was given ...
- 3
0
votes
2
answers
628
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Find inductor for XL6019 circuit boost converter
I need a way on my PCB to step up 5V to 12V (with currents up to 2A). I've been looking at the XL6019 IC and tried to copy the design from the sample circuit of the datasheet:
I'm currently stuck at ...
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1
vote
2
answers
194
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DC/DC converter output dropping as load increases
I'm using an NSR006A0X4Z DC/DC with 12V input and set to produce 2.5V output (Rtrim = 619Ω).
This is used for a current source, controlled by GPIOs of a Raspb Pi:
The op-amp is powered with ±5V. The ...
- 2,185
0
votes
0
answers
84
views
Ćuk converter implementation
I am trying to design a 50 W non-isolated Ćuk converter. I am using the IRF540N MOSFET which is driven by a 555 timer-TLP250 setup, using the fast-recovery BY399P diode.
I am trying to find a design ...
0
votes
0
answers
47
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Proportional-resonant controller for output voltage ripple compensation in a buck converter
If we are to compensate the output voltage of a buck converter using a proportional-resonant controller, what should be the approach to estimate the Kp and Ki values of the controller?
1
vote
1
answer
287
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Purpose of capacitors near the input of DC/DC boost converter
I recently bought this DC to DC boost converter (input from top; output from bottom). It has all the parts as a usual boost converter topology suggests: a mosfet, a diode, an inductor, and capacitors ...
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1
vote
1
answer
709
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Connecting the grounds on a non-isolated DC/DC converter
For isolated DC/DC converters, I know that it's a good idea to have two different grounds on both sides and that we should avoid to connect the two grounds together as the isolation is useless when ...
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3
votes
1
answer
235
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Inverting DC-DC converter input ripple issue
I'm trying to implement an inverting Cuk DC-DC converter on a 2 layers PCB, in order to generate a -3.3V rail from 3.3V, but the circuit affects greatly the input rail. The 2 rails are used to power 4 ...
- 382
1
vote
0
answers
266
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Problem connecting two DC-DC converters in one circuit
I'm building an audio mixer for microphones, and have a problem with the power supply part.
I'm designing this board to work with several voltages which are +/-15V, 5V, and 48V (for phantom power).
I ...
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0
votes
2
answers
1k
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High Voltage PWM
I really hope someone can help me with this difficult issue:
I want to generate a PWM signal from a 170V DC input.
ok, so far I have an arduino that can generate a PWM signal and drive a MOSFET that ...
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0
votes
3
answers
266
views
Connect rectifier to DC power source? [closed]
I'm thinking about DC appliances and energy efficiency.
A common appliance like an air conditioner has a rectifier to convert 230V AC into 50V DC. If I connect the appliance directly to 50V DC instead ...
- 1
2
votes
0
answers
82
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Booster Circuit Input Capacitance Design
I am trying to design a booster circuit. I need to find the inductance, output capacitance and input capacitance. I have successfully calculated the inductance and output capacitance. However, I am ...
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-2
votes
1
answer
787
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Why do I get these voltage spikes in my buck converter? [closed]
I want to make a buck converter with bidirectional GaN FETs, so each switch is made up of two back-to-back GaNs:
The problem that I encountered is that if I have a deadtime (DT) higher than 0 ns ...
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6
votes
3
answers
2k
views
What is the function of the inductor in the "Dual active bridge" DC/DC converter?
Studying the principle of operation of the DC/DC converter "Dual active bridge", I'm trying to understand what task the inductor (Ls) shown in the diagram performs. The transformer ...
- 547
1
vote
1
answer
90
views
How to design a controller for a non inverting bidirectional buck boost converter?
This is the circuit diagram that i made in matlab. I want in to design a controller for the it such that it works as a boost converter in one direction and buck in the other direction. But i don't ...
2
votes
1
answer
298
views
Reversible 4-switch buck-boost?
Can a 4-switch buck-boost be reversible?
The base scheme seems symmetrical but I did not find any reversible design.
Do you have an exemple of such a design?
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0
votes
0
answers
88
views
DC to DC converter options
I'm admitting here that I'm a little out of my element, so take that into consideration.
I am working on a project that combines a few different electrical devices that use different DC power sources. ...
0
votes
0
answers
113
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Buck converter design review - updated
Last week I asked this question attempting to find a solution to efficiently converting higher voltage to lower voltage.
From the answers, I arrived at TI Power Designer and I ended up with this ...
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0
votes
2
answers
2k
views
How does a boost converter allow for a gain in output voltage by just switching the positions of the inductor and switch?
I get that in a buck converter, a low pass LC circuit was attached and this effectively filters out high frequencies. If the bandwidth is configured so that it is lower than the switching frequency, a ...
- 469
0
votes
2
answers
348
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DC-DC Boost Converter \w Inrush Current Protection - Voltage
I wanted to dive in Power Electronics and create a 24V DC-DC Boost Converter that would run from 2.5 to 5 V power supply. 80% efficiency was assumed, and 30 kHz frequency chosen for the PWM.
Initial ...
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0
votes
1
answer
799
views
Why is there a LC filter in front of the DC/DC converter?
I have to study this circuit. I understand that Graetz's bridge is there to convert the current to positive, but why is there a LC filter at the entrance of the converter?
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0
votes
0
answers
100
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Forward Converter analysis
I am having difficulties in finding the DC component of the voltage across capacitor C2 expressed in terms of Vg and duty cycle D. In the first interval (DTs) the current through C2 is zero, hence the ...
- 95
1
vote
2
answers
453
views
Drop input voltage for a boost converter
I have a 21V DC solar panel power source, that feeds a DC-DC boost converter. I set the output voltage of the boost converter to 19.5V to charge my laptop, but since the input voltage is higher than ...
- 111
1
vote
0
answers
120
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Synchronous boost light load operation and general SMPS terms
What are the differences between the skip cycle, pulse skipping, diode emulation, and forced PWM at general DC DC converter light load operations? How do they work and when do I want to use them? Page ...
- 109
0
votes
2
answers
857
views
Average input current in forward converter
I am trying to understand how to calculate the average input current of a typical forward converter. If the converter has negligible magnetizing current, a large inductance and a turns ration of n1:n2:...
- 141
0
votes
1
answer
389
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Transformer secondary winding resistance
I am struggling to understand how to model a resistance loss of a transformer secondary winding. In a typical flyback converter, if the primary and secondary transformer have a resistance loss, how do ...
- 141
1
vote
1
answer
957
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It is possible to use a 100W 12V solar panel directly to charge a laptop, using a buck converter for example?
I am planning to go off the grid due to the pandemia, to an isolated village. I am working remotely I am looking for a solar approach to power my laptop ACER A5 515. The charger is rated 40W.
I was ...
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