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Hi, I'm working on a flyback power supply design. It runs fine at normal load but in overload conditions the transformer windings go into meltdown. The output voltage drops and the duty cycle decreases as expected but that doesn't help the transformer. I know I haven't exactly provided much information here but I was just after getting a gen
Hi, a typical current transformer is for some Amperes, but I assume you only need to know about milliamperes. --> Because the usefull input current range is very low, you should use a couple of primary windings to get higher secondary signal. Maybe increase the burden resistor value. Klaus
transformer in feedback loop is of course preferred, gives better voltage accuracy and lower distortion.
Hi, I am trying to measure AC rms voltage using PIC microcontroller. I have attached the circuit for measurement. I am connecting a 3V step down transformer out to the input of the circuit.The feedback capacitor has been added to reduce the noise, but I am getting noise if I add this. This is getting smooth after the low pass filtering. Everyt
The "transformer" is being driven according to feedback from the secondary voltage. The auxiliary winding has a different winding inductance and a different output impedance, so the auxiliary voltage will have no relation to the secondary voltage. The "auxiliary voltage" has a strong relation to the secondary voltage, but by the w
Is it really needed to have a feedback winding in a flyback transformer?
hi, What type of feedback amplifier (type-2,type-3 or PI) is used in a pure sine wave inverter? Suppose an inverter consists of a h-bridge and a low frequency iron core toroidal transformer. H-bridge is derived by sinusoidally modulated PWM (20KHz). At the secondary of the transformer there is a filter to get filtered 220v sine wave. (...)
Hi, so here's my problem , I've built an working smps , delivers loads etc fine but since i'm using for audio it's giving me this problematic output. My output is 90-0-90 VDC.I have two secondaries , two separate transformers each having a bridge rectifier and filter caps , also snubbers across the filter cap bank traces and idle voltage limit resi
Hello, I'm building a sinewave inverter and I'm using a low frequency transformer at its output. As I need an isolated feedback signal to control the output voltage, I was wondering if I could make an extra winding (few turns) to get a proportional voltage. The question is: will it be accurate enough? I mean, will it be proportional enough wi
Hi folks , please help me understand what kind of transformer i got and how many primary turns it needs, I was driving the transformer but after a while it gets hot and it should let more power through. I will post what I have, the schematic of the smps im using the transformer in and the photos of the transformer itself , (...)
Fluctuations are highly noticed in transformer-type adapters. Is your adapter based on transformer or SMPS? Is it AC or DC type? What is the rated voltage output? Try adding a large value electrolytic capacitor (if it is DC), and if possible use a zener diode of desirable output voltage.
Hello, I am working in my thesis on optimization of resonance DC/DC converter, the input voltage is 10V and the output voltage is 5KV (voltage multiplier is used), almost no current at the output. The working principle is based on the resonance of the transformer. Somehow, when I increase or decrease the output voltage the resonance frequen
I am working on designing power supplies of 5v/3.3v/15v/-15v using power management ics with variable unregulated DC input.. Right now i am considering using L4973 from stmicroelectronics which is a buck SMPS. Now it uses a fixed inductor - "SMT Power Inductors ? DO5040H". My question is how to make a transformer out of it to make multiple power su
There is nothing wrong with using Bottom rail for CM & DM reference; that is what it is designed to work with on this chip, but there may be CMRR penalties for noise below ground. The use of ground on both sides of transformer and then use an optoisolator is wrong. The bigger problem could be your lack of requirement specs for all PSU designs.
Hi all, I have a faulty ultrasonic cleaner which I opened and attempted to study its circuit. The fuse, 1N4007 diode, and both transistors (BUX84) were blown. I attempted to replace the faulty parts and they blew again upon switching on. This drove me to wanting to understand the machine further and I hope I can learn from all of you. I at
HI, I designed simple Sine Wave inverter, using using 12DC to AC conversion and stepping up to 220v at the end..I did DC to AC conversion using H Bridge..Bridge works fine at 12 V but when I try to step up that 12v H Bridge output the results are little disturbing..Bridge output drops to 6~7v and at secondary side of transformer just 130`140V not
Apart from the problem what's a suitable input source for AD8333, the shown amplifier topology looks erroneous in any case. The feedback loop through cascaded amplifiers must be considered unstable. "Fully differential" is usually designating differential in/out amplifiers, alternatively a transformer could be used.
feedback can only reduce the output voltage by decreasing the duty cycle. Looks like wrong transformer design or excessive ouput stage voltage drop.
I think that, current sense pin (Ilim) signal of uc3825 has problem. When I turn off input ac supply, signals (pics of scopes) return normaly square wave, also signal of current sense pin return normally sawtooth (this event occur in 1-3 seconds and signals low zero). I used current transformer(1:100) for current sense.
The schematic in black is a simple crude circuit. Crude means cheap with poor performance and probably poor reliability. It is a single transistor oscillator driving the transformer that gives its positive feedback.