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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Ground connections around bridge rectifier in flyback converter

I am designing a flyback converter and I am being told to make the ground net connections as shown in the image below. I think this is colossally dumb because it eliminates PRI and SEC isolation. I ...
sparaps's user avatar
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Flyback transformer (BSC25 T1010A) pinout [closed]

I have a flyback transformer (BSC25 T1010A) with a pinout I attached below, but I don't know what the names of the pins represent (TP1, TP2, B+115, H.out, HT). I need to find the primary and flyback ...
Ria sri M's user avatar
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Electromechanical relay snubber

I am using an electromechanical relay in a relatively medium-current project, in the range of 3-5 amps. I have designed it so the coil is controlled by a microcontroller through an optocoupler, with ...
lemon's user avatar
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Flyback converter sense resistor placement and wiring

I am designing my first ever Flyback converter. The Fsw = 100kHz. Peak primary current = 3.26A. The converter has to fit in a very small space, so I'm making a lot of compromises. For example, I could ...
slimcolt's user avatar
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Transformer Model LTspice - Flyback Voltage Clamped on Primary but Still Present on Secondary Side

I'm simulating a circuit in LTspice using a pulse transformer to drive a JFET gate. The circuit is supposed to work as follows: We drive M1 (N channel FET) to pulse current from a 20V source through a ...
L30LVC's user avatar
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Why solid state capacitors?

I've been looking through multiple cellphone chargers and I have noticed that they all use solid state capacitor for the output capacitor of the switching power supply (flyback converter). Is there ...
Mohsen Razzaghi's user avatar
2 votes
3 answers
188 views

Will a housekeeping flyback require EMI filtering? [closed]

I'm interested in designing a hobby custom power supply in SPICE using a full bridge converter topology. I will have various components which will require biasing, so I was also thinking of using a ...
user353165's user avatar
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POE circuit with small transformer and small volume footprint

I would like to make an isolated POE802.3af controller that can convert POE ~48V to 5V 2A, but the main problem is most designs use a standard POE transformer that has multiple coils. The problem with ...
Voltage Spike's user avatar
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2 answers
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How to get a smooth operation of multiplexed solenoids

My project involves 100 small solenoids, that I either have drive individually, or hopefully I can drive in a multiplexed configuration, the same way LED displays are driven. Then I only need 20 ...
Björn Morén's user avatar
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How can I isolate internal circuit from external power from L298N?

I have a small simple circuit where an ESP32 runs an L298N driver for a single DC motor (not a stepper.) The run and direction are controlled by a simple web page with two buttons. The code works ...
WouldRatherBuildAMotor's user avatar
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Power meter design

We want to design a 3 phase power meter that measures AC voltage, current, frequency and calculates power factor. We want to use a voltage transformer and a current transformer for each phase. My ...
Issam H's user avatar
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A steady-state DC model of FLyback in CCM with two outputs (multiple outputs) [closed]

I tried to post it in a "normal" form but Stack blocks it, so put the question as figures.
Bart's user avatar
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Optimal Protection Circuit Configuration for TMC2209 Stepper Motor Outputs

I am currently working on a project involving a stepper motor driven by a TMC2209 driver. I aim to implement effective protection for the motor driver outputs. According to section 3.7 of the TMC2209 ...
Murtuza Quaizar's user avatar
4 votes
3 answers
437 views

Flyback Transformer Winding Direction

Looking at the basic Flyback Converter Topology, the coupled inductor polarity should be opposite in order for the circuit to operate properly. However, I am confused on how to implement the correct ...
Gman's user avatar
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Why does my flyback transformer simply refuse to work?

I've been trying to create a Kirlian setup like the one in a video by 'The Plasma Channel', and the flyback transformer for the power source just refuses to work. I have a T1010A transformer, and I'm ...
Newfoundlander's user avatar
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2 answers
136 views

Generating a biphasic pulse

I was trying to generate a biphasic pulse for TMS application. I was referring to this website. The waveform is given below.My circuit implementation is described as follows. I am making a flyback ...
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11 votes
4 answers
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Does a diode flyback protection decrease the life of the relay?

I am currently making an automotive circuit that controls some automotive accessories (personal project not for production). In my circuit, I will be controlling some automotive relays and in any ...
DrakeJest's user avatar
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MOSFET does not fully turn off in flyback converter

I have this prototype flyback converter on a breadboard. However there is a problem. As you can see from the oscilloscope captures of Vds when I use Vin=25V the MOSFET turns off in 3 us. But in Vin=...
Amin Gholizad's user avatar
2 votes
1 answer
102 views

RCC SMPS Regulation

Could someone explain how the auxiliary winding controls the output voltage on the secondary winding? For instance, How do the zener diodes function? How do you calculate the output voltage as a ...
mrbean's user avatar
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1 answer
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Continuous and discontinuous mode flyback Confusion

I was looking at the construction of flyback transformers and found that there are two modes - continuous and discontinuous. I have related questions: Is the circuit design for continuous mode and ...
kam1212's user avatar
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Variable inductor

How can I design a variable inductor with a closed core? It should be used in flyback topology so I need it to be a low leakage. My idea is to use rectangle shape (CI core.) One leg will be movable ...
Michal Podmanický's user avatar
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2 answers
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Simulate or Calculate Inductor Flyback Voltage from Component Parameters?

simulate this circuit – Schematic created using CircuitLab Top circuit can be used to simulate the increase in velocity of the JATO Powered Chevy featured in the first episode (and subsequent ...
SystemTheory's user avatar
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1 answer
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NCP12400 ROPP (overpower protection)

This picture is a typical application circuit in the datasheet of NCP12400 flyback controller IC. What does the ROPP in the red circle mean and how does it work? Some people say it is used to filter ...
Jacky Yang's user avatar
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1 answer
152 views

Flyback converter MOSFET driver

I am building a flyback converter to convert 230V AC to 20V DC using a microcontroller. So far my simple converter works, but I have to power the MOSFET driver such as HCPL-3101 from a secondary DC ...
Amin Gholizad's user avatar
3 votes
1 answer
101 views

Why does switching the winding direction on transformer give me a better conducted EMC meassurment?

I am making a charger and I am measuring conducted and radiated EMC. The circuit is a flyback and the transformer in mention is a sandwich style transformer with 4 windings. Primary windings, ...
Marcus Spydevold's user avatar
1 vote
3 answers
116 views

Will relays benefit from protection in form of a flyback diode?

If an inductive DC load is controlled via a relay, would that relay need or benefit from a flyback diode for protection from the loads off switching voltage spikes? Note that this is not about a diode ...
MiNiMe's user avatar
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1 vote
1 answer
217 views

Two switch flyback converter MOSFETs voltage stress

I am exploring and experimenting the two switch flyback converter. I have a doubt, in this two switch flyback converter configuration, two MOSFETs are connected in series with sandwiched primary coil ...
Vikram's user avatar
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0 answers
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Energy regenerative snubber for flyback converter

I am trying out the regenerative snubber design in https://core.ac.uk/download/pdf/215381319.pdf page 13. The circuit configuration is shown in the figure below: I am unable to derive the following ...
p_karis's user avatar
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2 votes
2 answers
135 views

How far away can my flyback diode be from my inductor?

I have a relay that turns on a dc valve that is connected to it by an electrical socket. Will there be adverse effects if I put my flyback diode near the relay, leaving about 12-18 inches of wire from ...
Jman's user avatar
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1 answer
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How to select transformer

I want to design a flyback switch mode power supply. I used WBench from TI. I inputted my specifications and I got this for the transformer. How do I use this information to choose an off-the-shelf ...
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Fusible resistor blowing on flyback converter

I have a flyback converter circuit with AC input, and I have a fusible resistor on the hot line before the rectifier. When I hook up AC power to the input, the fusible resistor immediately blows. It ...
sparaps's user avatar
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High voltage self-oscillating boost

When the boost from Vin=325V (high voltage) is designed there is a problem with starting of oscillation since high turns ratio between primary and excitation winding has to be used. How is usually ...
Michal Podmanický's user avatar
2 votes
0 answers
47 views

Type 3 compensator with opamp compare calculation/simu and measured difference

I'm designing a type 3 compensator with an opamp for a flyback which is operating in a constant voltage mode. Therefore I measured the plant and started to design a suitable type 3 compensator to ...
daniel's user avatar
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1 vote
1 answer
421 views

Flyback converter design using UC3843

I am designing a offline power supply which will 24 V as output with 2.5 A. I found UC3843 as better option. I used TI we bench tool to design my power supply. This is the schematic I got from it. The ...
Balaji N's user avatar
0 votes
1 answer
132 views

Diode in parallel with AC solenoid valve

I have a circuit I'm trying to design to fire both 120VAC and 24VDC solenoid valves. We have relays that work on 12vdc for the coil, and can switch AC or DC. the valves are normally around 30W. I ...
Austin Fox's user avatar
2 votes
1 answer
90 views

Reduce Vds peak in flyback converter

I am trying to design a flyback converter but the low side FETs suffers from high Vds voltage spikes. The flyback with active clamp should convert 6 ~ 15V into 40 ~ 90 V. Power should be 100+ W. The ...
JBtowerway's user avatar
0 votes
2 answers
147 views

Consequences of higher magnetising inductance in flyback converter

I have a design where an ETD44 ferrite flyback transformer is used with a switching frequency of 50 kHz to step up voltage. The rated power is 250 W. The magnetising inductance of the transformer is ...
Jenny's user avatar
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0 votes
1 answer
230 views

Transformer turn ratio in DC-DC flyback converter for high voltage output

I have been for the past 3 months trying to design and experiment with topologies to charge a high voltage capacitor up to 1 kV. I have settled on a classic flyback topology: I have tried several ...
ShiroGeek's user avatar
1 vote
1 answer
84 views

Is it possible for a flyback diode to increase solenoid temperature?

I have a circuit with solenoids (rated at 12V 1A), and I am controlling them via an N Channel MOSFET with an overdrive function to keep them cool, since that is my main issue. Initially, I had put a ...
user344593's user avatar
0 votes
1 answer
124 views

Flyback transformer manufacturing

I would like to build a flyback-converter that is presented in a research paper. The following information about the transformer have been provided: ...
Jenny's user avatar
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1 vote
3 answers
123 views

Flyback diode for a relay in a car

I need to use a relay in my car to power a piece of equipment when the ignition switch is off. Relays / relay sockets have diodes to suppress flyback voltage spikes and prevent damage to switch ...
dummygear's user avatar
0 votes
1 answer
233 views

Voltage ringing on secondary side of DCM flyback

I am trying to find out the 'inductor' responsible for secondary side voltage ringing observed when flyback MOSFET(SW) turns on using LT8300 simulation in LTspice. Frequency of ringing observed is ...
Ronnie's user avatar
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1 vote
1 answer
74 views

"Maximum allowable dead time" in active clamp DCM/BCM flyback converter

I am currently looking into the academic paper "SOFT-SWITCHING ACTIVE-CLAMP FLYBACK MICROINVERTER FOR PV APPLICATIONS" from http://studentsrepo.um.edu.my/8036/7/rasedul.pdf and I am trying ...
Jenny's user avatar
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4 votes
2 answers
281 views

compensation for flyback regulator with 431 and optocoupler

I am testing a flyback converter with secondary side regulation, by means of a 431 in conjunction with an optocoupler with nominal CTR of 50-100%. A snippet of the regulator part is below. I have used ...
tobalt's user avatar
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How do I modify my flyback transformer to output 5kV?

I was wondering how to modify this circuit to end up with a 5kV power supply. I watched a Video by the Plasma Channel on YouTube on a similar design but it outputs 15-20kV which is too high for my use....
TallBoi's user avatar
1 vote
1 answer
71 views

How is the value of R1 calculated in this xenon flash circuit?

I have made a voltage boosting circuit using a flyback transformer by using the first part of a xenon flash circuit. Instead of an H1061 transistor with R1 of 620 Ω I used a 2SC4834 which works with a ...
Oli Senior's user avatar
1 vote
0 answers
41 views

Transformer Design and Ripple Formula

When I was researching flyback inductor I saw a formula which is showing the effective transformer core volume with related the ripple factor. r = 2Iac/Idc = ΔI/Idc Where does this formula come from?
John Reese's user avatar
1 vote
0 answers
221 views

Why use a DRV2700 high-voltage piezo driver in this application?

The DRV2700 from Texas Instruments is an integrated circuit for driving piezoelectric/capacitive loads at relatively high voltages (max. +/-100 V) while the supply voltage can be as low as 3.3 V. This ...
Charly's user avatar
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2 votes
0 answers
103 views

Flyback energy from coil flows back to source (high power pulse generator)

I am charging a coil to 2A, then (after BJT off) I want transfer this energy to cap to get a rounded L2 coil pulse (voltage). The coil pulse will be used to wireless signal transfer. This generator is ...
Michal Podmanický's user avatar
2 votes
0 answers
74 views

Asymmetrical Half-Bridge Flyback Converters Simulation issue

I am using SIMPLIS to construct an Asymmetrical Half-Bridge Flyback Converter. Additionally, I am attempting to implement Synchronous Rectification on the secondary side. Please refer to the schematic ...
Jitter456's user avatar
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