Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [llc-converter]

18 questions
4
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3 answers

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 stages working and optimized. Right now I'm…
Jonathan S.
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2 answers

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 IRFZ48SPBF MOSFET and the FAN3111ESX MOSFET driver as…
Benjamin Collier
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3
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1 answer

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 of element I should use in SIMPLIS.
Power JJ
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1 answer

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 oscillation on the voltage Vnode of 75 kHz. In the…
hanss
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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 paper, but I got some problems, Does anyone know…
Magnetic778
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LLC resonant capacitor RMS voltage and output capacitor ESR calculation

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 formula? On Page 27, I don't understand why it…
Jitter456
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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. The design is size-limited so I'm not free to…
Rohat Kılıç
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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 DCM and CCM conditions, at page 6. Excerpt from…
Rohat Kılıç
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1 answer

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 it possible to adjust the output by changing the…
Magnetic778
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ZVS loss calculation in SIMPLIS

Below is the Half-Bridge LLC Converter Example from SIMPLIS. I would like to observe the loss from the low side MOSFET. I want to compare the ZVS and Non-ZVS conditions. I am curious about why the circuit operating in ZVS condition the power loss…
Power JJ
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LCC Resonance Converter

I am trying to understand and design a LCC Converter I read lots of documents about LLC and read "Design of efficient LCC based on ICL5102/HV combo controller IC" for LCC, I think I have a decent amount of knowledge about the working principles but…
U.Deniz A.
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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 calculated value is around 452ns. but when I use…
Power JJ
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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.ti.com/seclit/ml/slup263/slup263.pdf) I know the…
RogerDodger
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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 do not want to short circuit your load. …
Erik McKee
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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 one side and secondary and secondary aux in…
Venkatesh
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