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Questions tagged [llc-converter]

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Power MOSFET Simetrix simulation using in LLC

I'm trying to model switching losses of an Infineon Power MOSFET (IAUS300N10S5N014) in SIMetrix/SIMPLIS Elements by using in the LLC circuit. But I have some questions. In the SIMetrix, how should I ...
EEC's user avatar
  • 413
2 votes
1 answer
36 views

Implementing triangular ramp in simulation

I am using the UCC256301 in a project (I know it says it is not recommended for new designs). I am trying to simulate my system using PLECS and it needs the controller IC's behaviour implemented. From ...
SM32's user avatar
  • 406
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1 answer
90 views

LLC Half Bridge, Magnetic components testing and implementing problem

In my power supply design I am tested switching operations of half bridge circuit with open circuit and observed clear 155, -155 square wave I want to test step by step so for next step I want to ...
MSB's user avatar
  • 27
4 votes
4 answers
636 views

Why is an LLC converter's optimal Lm Lr ratio around 10?

I have seen this ratio of 9 to 11 being close to optimal for the Lm to Lr ratio in LLC resonant converters. Aall the sources mostly state it as a matter of fact instead of explaining why. What is the ...
Stonie's user avatar
  • 433
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0 answers
47 views

Generating LLC Tank Gain Curves within Open Loop Simulation - SIMPLIS

I'm using the half bridge LLC open loop circuit mr. basso very kindly gave to the world, but I am having troubles generating the tank gain curves. I'm somewhat of a novice when it comes to SIMPLIS and ...
RogerDodger's user avatar
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1 answer
44 views

Gate driver selection for digitally controlled via PFM, LLC resonant half bridge charger

I am designing a LLC half bridge charger. I am going to use a microcontroller to control the switching frequency, with feedback from the output to smoothly control the switching requency. I don't ...
MSB's user avatar
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0 votes
0 answers
135 views

PI controller for LLC converter does not work under all conditions

I used this paper as a reference. I am simulating a half-bridge LLC (350V-400V input to 12V output) with a PI controller. You can find the MATLAB Simulink model I have here. All the parameters are ...
Alex's user avatar
  • 125
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1 answer
305 views

Why LLC converter can't work in wide output voltage

I've been studying about LLC Converters recently and I've come across a few points that I don't quite understand. Here are my questions: 1.Why can't an LLC Converter achieve a wide output range? Isn't ...
Magnetic778's user avatar
2 votes
1 answer
78 views

LC-converter non sinosoidal currents and voltages

I simulated a LC-converter with a verly low static switching frequency of 300 Hz. I expected the current in C1 and L2 in a sinosoidal shape but instead it is almost a square wave. Also there is a ...
hanss's user avatar
  • 147
3 votes
1 answer
426 views

LLC Gain Curve by using SIMPLIS

Is it possible to use SIMPLIS to draw the gain curve of the LLC converter? Because FHA analysis is not very accurate when the operating frequency is above the resonant frequency. If it can, what kind ...
Power JJ's user avatar
  • 357
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1 answer
1k views

LLC ZVS deadtime calculation

According to the TI LLC document, I can use eq 32 to calculate the dead time to achieve the ZVS in the half-bridge LLC Converter. below is my spec of half bridge of LLC converter. the deadtime I ...
Power JJ's user avatar
  • 357
0 votes
1 answer
264 views

Solving for Normalised Frequency with LLC Gain Equation

I would like help solving the equation below for Fn within matlab or Octave (preferably). What I know is the following: MG = 1.3 QE = 0.52 LN = 3.5 Because I am following this reference(https://www....
RogerDodger's user avatar
0 votes
1 answer
57 views

LLC SMPS operation at low or no load -- can I just disable the gate drive?

I have made my own LLC converter using the UCC25600 controller chip. I can only operate the power supply at some Rmin and Rmax for the output load. Controlling the Rmin makes sense to me because you ...
Erik McKee's user avatar
4 votes
3 answers
649 views

How does this LLC converter keep 50% duty cycle and zero DC offset with AC-coupled feedback?

I'm currently designing an LLC resonant DC/DC converter with 12V input, +/-15V output and nominal 200W combined output power. I've already got my resonant circuit, transformer, gain curves and power ...
Jonathan S.'s user avatar
0 votes
1 answer
193 views

How to measure the leakage inductance of LLC Split bobbin transformer with two auxiliary windings

Let’s say I am having ETD core and split bobbin for LLC Design I have 4 windings in that transformer primary secondary primary aux secondary aux I am winding the primary and primary aux windings in ...
Venkatesh's user avatar
1 vote
0 answers
33 views

LLC initial current and voltage estimate from the equation

There is a paper called Real Time Hardware-in-Loop Implementation of LLC Resonant Converter at Worst Operating Point Based on Time Domain Analysis I am trying to derive equations 25 and 26 from this ...
Magnetic778's user avatar
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1 answer
140 views

LLC converter design step

I read the Infineon document about LLC converter design. On page 13, can anyone help to explain why this document uses this method to determine the maximum and minimum voltage gain? Except for this ...
Power JJ's user avatar
  • 357
-1 votes
1 answer
1k views

How can I calculate Litz wire strands?

How can I calculate Litz wire strands? I am trying to calculate the Litz wire strands for a LLC ferrite transformer design. IRMS = 2.4 A J = 4 A/mm2 For these values: A = 0.6 mm2 D = 0.9 mm ...
Venkatesh's user avatar
4 votes
2 answers
335 views

Synchronous rectification problems

I am currently designing a LLC resonant converter and am trying to perform synchronous rectification but am running into some issues with it. This is my design and note I am currently using the ...
Benjamin Collier's user avatar
-1 votes
1 answer
49 views

Use ESP8266 to power (HF165FD) relay

I am working on a project where I need to remotely switch the power for my dryer. I am using a ESP8266 which outputs 3.3V to the LLC which switches the 5V relay to the dryer. I am having problems ...
Francois's user avatar
1 vote
1 answer
531 views

LLC resonant capacitor RMS voltage and output capacitor ESR calculation [closed]

I have a question about the TI LLC document. On page 25, Select the Resonant Capacitor, I don't understand why it can use this formula to calculate the RMS value. Could someone tell me how to get this ...
Jitter456's user avatar
  • 575
1 vote
1 answer
372 views

Single-turn Secondary Winding on an SMPS Transformer

First of all, conceptually, this question is not a duplicate of this one or this one. I'm designing a high-power LLC converter. For the transformer design, I've come up with a 16-to-1 turns ratio. ...
Rohat Kılıç's user avatar
1 vote
0 answers
366 views

DCM and CCM Behaviour in LLC Converters

I've been refreshing my power electronics knowledge these days. During my re-visit to the LLC converters, I've come across this application note. It also explains the behaviour of an LLC converter at ...
Rohat Kılıç's user avatar