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Questions tagged [flyback]

A flyback diode is a diode used to eliminate flyback, which is the sudden voltage spike seen across an inductive load when its supply voltage is suddenly reduced or removed. A flyback transformer, also called a line output transformer, is a special type of electrical transformer designed to generate high voltage sawtooth signals at a relatively high frequency.

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High Step-up Ratio DC-DC Convert (12V-to-150V) - Boost, Flyback, Coupled-inductor Boost?

I am trying to design an on board DC DC converter that generates 150V from a 12V input. I'd like to design it to handle at least a 30-50mA load, but in reality the load will most likely be smaller. ...
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724 views

Transformer maximum voltage rating specifications

I don't know how to interpret the voltage values found in datasheets for transformers. For example, in the datasheet below: where it says 15v, 50mA near the winding schematic. Is this a maximum or a ...
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158 views

Flyback simulation - not regulating at lower load

So I've been trying to simulate a flyback converter with the full load condition of 10v, 10A (100W) at the output at fs = 80kHz. The design equations I used were from "Pulse-Width Modulated DC-DC ...
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1answer
69 views

TV flyback transformer replacement without RC snubber?

I need to replace the flyback transformer on my Atari SC1224 CRT monitor. The flyback I removed from this monitor has a model number of Kf4825G, and has an RC snubber attached to it, which does not ...
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1answer
714 views

High voltage (2-6 kV), high frequency (20-50 kHz) power supply how to achive

I need to make a high voltage (2-6 kV), high frequency (20-50 kHz) power supply in order to generate cold plasma (in Ar gas). I use a fly back circuit (found in web) could allow me to to that. The ...
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1answer
50 views

Digital DC DC Converter for Power Control

I want to find a way to control a power device from a microcontroller. I must control a power device from the microcontroller, making the voltage to vary betwen 0 and 28 VDC, knowing that the power ...
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1answer
101 views

SMPS Flyback transformer selection

I am trying to design a SMPS for a project (I have to make a custom one for integration purpose). This SMPS have universal input (85-265V AC at 50 or 60 Hz) and an output of ideally 53V (but it can ...
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1answer
105 views

Flyback converter primary and secondary sides power calculation

The problem is as below. Input DC voltage is at 12V, transformer inductances are: Lp = 60uH, Ls = 240uH, switching behaviour is controlled by a single NMOS with switching frequency at 60kHz. For ...
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1answer
105 views

Maximum voltage and current input of this circuit?

I am looking to assemble a power supply with an output of roughly 600 watts. One of the components required for such an apparatus is a 40 kVDC, 20 mA flyback transformer that I managed to find and ...
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1answer
71 views

Proper Flyback Current Protection Circuit for Variable Voltage Solenoid Driver

I am using a darlington buffered op-amp to drive a solenoid motor at variable voltages (for variable speeds of actuation). Here is my circuit as it is now: I am wondering which of the two flyback ...
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1answer
110 views

Designing flyback converter - multiple isolated outputs

Can I treat 2 secondary coils with dual voltage output as one with double voltage for the purpose of calculations? This seems to be OK for all formulas based on output power as technically the ...
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1answer
129 views

Sizing zener and resistor for solenoid flyback

I am trying to drive a vibratory pump from a 220 V boost converter (the common 150 W DC/AC 12 V to 220 V boost converter found on ebay) and a MOSFET switched by an Arduino/optoisolator at 50 Hz. The ...
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1answer
478 views

Half bridge DC-DC converter circuit analysis

I was trying to learn how the flyback and half bridge DC-DC converter is working. For Flyback circuit, Understood output waveform is as follows. Keeping this understanding in mind, I was trying to ...
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1answer
311 views

Simulating Pulse Induction Driving Circuit in Proteus Errors

I've been trying to simulate a pulse induction driving circuit in Proteus to no avail. One issues appears to be with how I am using Proteus and the other seems to be a simulation or setup error that I ...
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1answer
345 views

Flashing LED circuit using Flyback Topology Flickering Problems

Background: Design an LED circuit that alternatively flashes 40W LED strings approximately 45 times per minute. Approach: I began by getting my hands on Linear Technology's LT3799-1 - Offline ...
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1answer
107 views

feedback loop for a single stage offline flyback that is powering 2 independent LED strings

I have a design that is a offline, single stage flyback, powering two different LED strings. The output of this converter is about 50W and the output voltage can range from 20V-45V. I'm using ST ...
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1answer
427 views

Adjustable current limiting in flyback converter using TL431

I'm building a SMPS and I would like to have a current limiting feature on the output. I'm trying to make a feedback loop using TL431, shunt resistor, optocoupler and a potentiometer, but no luck this ...
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0answers
203 views

Mazzilli flyback driver mosfets keep failing

I've been trying to build a high voltage generator consisting of a high-voltage transformer and a Cockroft-Walton multiplier. I have actually tried several different drivers to drive a high-voltage ...
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0answers
112 views

55-650V to 5V DC/DC convertor design

For an application I am building I need a custom DC/DC convertor that can convert a voltage ranging from 60V-600V to a contant voltage of around 5V. Using the TI Webench with the paramaters Vin_min = ...
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0answers
32 views

Increasing output current from ZVS driver

I bought the ZVS driver as shown in the picture below: After connecting a flyback transformer, I tried measuring the voltage and current at the output. The open circuit voltage is about 12KV. To ...
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0answers
93 views

Reducing AC/DC adapter (SMPS) output voltage

I have a AC/DC adapter P-1650-22 (used to power a notebook) laying around. I would like to use it for other purposes, i.e. as a constant voltage source for LEDs. The problem is, that the output ...
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0answers
67 views

Hybrid Boost-Flyback Stability Issue

I tried to design a step up SMPS to create ~200-300v from a 24V input with an expected power of ~12W max. Since the project is for a hobby, I chose to attempt a hybrid boost-flyback converter to get ...
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0answers
83 views

Flyback Converter with multiple DC outputs

I am trying to understand how (step up) Flyback Converters work, since I need to design one myself. I am not at all new to electronics and I understand the fundamentals behind them, but I am totally ...
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0answers
79 views

Possibility of hybrid forward-flyback topology

Within the context of isolated converters, the flyback topology is nice in its simplicity as can be the forward topology, in spite of needing a second primary reset winding. However, both make poor ...
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0answers
171 views

UCC28C44 flyback start-up problem

I have a problem with a design of a flyback converter for a power supply. I am using UCC28C44 PWM IC. Converter should star up with at least 200V and VDD should be charged to 14V when 15V should ...
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0answers
443 views

Flyback Converter Design Help

I am unsure whether I should edit on my previous question or create a new one. Please give me your feedback on the proper way of doing it here.Back to the question, I have struggled for the past few ...
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0answers
168 views

Flyback diodes for motors wired in parallel

When driving two DC motors wired in parallel, do they each require their own flyback diode or can they share a single diode?
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0answers
350 views

Flyback transformer for offline switcher ac-dc PSU

I am designing a 5V 3A SMPS circuit using Viper22a (60 kHz switching frequency) and transformer design is turning out to be the most difficult part of it. Actual load will draw less than 10 watts but ...
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0answers
331 views

Fly-back converter

I'm trying to get 2 isolated outputs (5V and 3V from 12V DC supply) using a single flyback converter by adding one more secondary winding on the flyback transformer. Following is the Simulink model I'...
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0answers
650 views

Flyback Transformer Active Snubber Design

I'm using a flyback transformer along with the LT3750 controller by Linear to charge a capacitor. I'm wanting to increase efficiency and improve the circuit. I began with looking into an RC snubber to ...
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0answers
162 views

How can I add redundancy to the flyback diode protection across an inductive load?

Dear StackExchange users, I want to add redundancy to a flyback diode system that is protecting an N channel MOSFET from flyback of an inductive load but I don't know how to accomplish this! I am ...
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0answers
32 views

Understanding flyback transformer datasheet

Please see the below image of a flyback transformer I found. I see voltage/current outputs at each secondary winding. My question however is, how are these determined? I thought the output levels are ...
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54 views

Flyback Converter Switching MOSFET Breakdown

I am using a UC1845A to control the switching element MOSFET (FCB20N60F) which is used for a typical Flyback Converter circuit. MOSFET's drain is connected to transformer. Rarely MOSFET is not working ...
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30 views

Flyback, primary inductance selection for wide output current changes

I would build my first flyback converter. Converter would be designed for 2A max and load device would draw about 100-200mA for most of the time with 1.8A peaks. Peaks would take a little longer so I ...
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0answers
161 views

Buck-Boost Controller Arduino Nano vs STM32

I have 900W (150W*6Panels) solar panels and 12V inverter (1000VA) which have inbuilt PWM solar charge controller. The distance between pannels and inverter is around >10m and the wires are 6 sq mm ...
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0answers
34 views

SMPS topology for combination of current controlled rail and fixed voltage rail

I'm looking at designing a LED driving power supply that can interface with a universal AC main input (~90VAC-260VAC) and produce 2 rails at the output; one a current controlled rail, and the other a ...
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361 views

Fly-Back converter in Proteus

I have been having this problem since I started to design my Fly-Back type voltage converter, and it is that it is throwing me a time step too small error, and I tried to solve it by configuring the ...
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0answers
295 views

Reflected voltage in DCM flyback

While designing converter I got to the point of calculating secondary coil. Most guides have these equations for it: Wait a second, didn't I calculate Nps already at the very beginning? Yes, I did! ...
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0answers
108 views

Designing flyback converter - Current ripple and turns ratio

This would be a long question, I apologize in advance. In the process of learning about flyback I've calculated same LT8302-based converter using five methods. Four from generic (as in: not related ...
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0answers
50 views

Designing flyback converter - Switch voltage drop

Switch voltage drop is often used in turn ratio calculations, however it is rarely specified in datasheets for converter ICs with built-in FETs. The closest I found is "Rds at Isw". Should I multiply ...
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0answers
69 views

Designing isolated flyback with multiple outputs

UPDATE: as suggested, I split this question into separate parts (links below). I left the last one here. It is so silly I am rather proud of it ;) UPDATE 2: it seems that breaking one post into ...
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0answers
58 views

Interfacing external high speed ADC techniques

I am designing a power converter for solar micro-inverter based on fly-back topology (step-up). I have to extract maximum power from the solar panel and for this I analyze voltage and current change ...
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0answers
452 views

SMPS power calculation

I am planning to design smps power supply that using flyback topology. It will have 12V@5A output values. But it is not clear for me how to estimate input power. It will supply from 220 AC input port. ...
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0answers
210 views

How can I model a flyback transformer on PSPICE / Multisim?

I need to simulate a flyback transformer, this one specifically. I have not used any models not provided in the regular PSPICE or Multisim before. I checked the manufacturer website and no models were ...
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139 views

How to dissipate energy/heat in solenoid valve + flyback diode circuit

A simple device that I didn't make uses solenoid valves (driven by relays) and I have to deal with the EM spikes they generate when turning off as this interferes with other equipment in my lab. The ...
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0answers
952 views

Flyback Transformer Driver not Working

I'm trying to make a flyback transformer driver circuit below: There's more details on his website (click here). Anyways, I'm using the same flyback he's using, and I believe it is an AC flyback (non ...
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0answers
100 views

Wrong inductance at flyback transformer?

I want to design a 12V-to-48V@0,3A isolated DC-DC converter using LT8302 and I was following the design example given in the datasheet. Using the values for "8V to 36VIN/48VOUT Isolated Flyback ...
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55 views

Finding correct flyback transformer for ZVS mode

I'm trying to design an offline flyback smps based on a L6565 chip from ST with 5V@1A output. I've found a small transformer from Coilcraft with auxiliary winding and turn ratio 1:1:1. If I ...
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0answers
307 views

How to control voltage and current output for flyback converter with varying load

I managed to design a working flyback converter with a feedback. I have one last obstacle and I hope a kind soul is able to help me out. I placed a dummy load, for instance, I dictate it as 1 ohm. ...
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248 views

Flyback switching power supply flickering debugging and proper software for its simulation

we are using PIExpert V6 for building one fly-back switching power supply, SO the calculated power supply is this kind: and the Altium files is here: source files are here: source files or : ...