smps

Hi I have a SMPS thats not works (full off. Just voltage on main capacitor is ~300VDC) even by replacing PWM chip and TL431 and optocoupler. Also I tested FET and it is healthy. Also when measuring IC supply voltage it is about mili-volts. My question is there are a way to place a temporary...

Hi everyone, I’m working on an SMPS using LNK3694 (900V internal MOSFET). Design details: Topology: Flyback Outputs: 5V @ 100 mA 12V @ 50 mA Input: Universal AC (rectified mains) IC: LNK3694 (Power Integrations) Problem: The SMPS works perfectly under normal conditions. However, when the...

So i am trying to build this circuit using nothing but basic components (RLC) with a 555 timer for the PWM and Op Amps for feedback to ensure it is regulated. It needs to be able to take an input of 20V +- 4V and output a steady 5V@0.5A. My idea is to take a voltage divider at the buck converter...

Hello, i was planning to use my old pc power supply, to make lab power supply. When i plugged it to the main voltage, everything works normal, normal output voltages and such. The problem came when i tried to connect the load on the 12v rail, it keeps shutting down, due to the overcurrent...

Hi i have an playstation 1 power supply that no longer wants to turn on. After a lot of diagnosing and checking parts i figured out that the base of the npn transistor is not getting any power. The transistor is working perfect, i tested it on a different board. But now i dont know what is...

Hi! I have two driver boards for xenon flash light. I received them faulty, with some signs of previous repair attempts. For learning purposes I am also trying to fix... :) Some notes: I rev. engineered the circuit board and put it into ltpice (hope I did it right). Since I did not found any...

Hi, My requirement is that I have an input of 10VC to 32VDC and I have to design a power supply that can convert the said input to 12VDC with a capability of sustaining load of 310mA minimum. As i am looking for a cost effective solution it will require me to design a discreet buck boost...

Hi all, I have decided to post my question with my calcs following his example on page 7-21 of colonel mclymans book (he design a multi-output, I will design a single output). It has been a while since I have looked into transformer design and I will most likely reread the book with more...

Hi Good afternoon all. My smps HF transformer secondary output is 12 volt 33 amp. I want to increase voltage 24 volt . ampere 5 amp is sufficient for me. Can i increase the secondary turns. Secondary has multi strand, so can i do half the strands and double turns. Or do i need to rewind primary...

Which component is this in an smps just after bridge rectifier.

I bought a power supply adopter (old, used, made for some device) of 24v 4.5A (from 230vac mains). It is a fixed output psu. My intention is to make it a variable psu of 30v to <=5v (as low as possible, and continuously variable). Schematic (simplified) of its error-amp circuitry is attached...

I'm currently encountering difficulties in testing my MOSFETs. I am in the process of designing a snubber for an IRF840 operating at 20kHz. Upon attempting to test (drive) the MOSFET, at <= 50% duty, in its basic state without any additional circuitry, I observed a 4V voltage drop from the 12V...

This circuit has been designed and optimised. When implementing on PCB R3 resistor is burning up. Any reasons or suggestions for this to happen? Circuit is stable and safe when supplied with 190V and any higher R3 starts burning up. R3 has a power rating of 0.125W went with the parameters of PI.

Hi Experts, I've got 12V, 20A, 240W SMPS (AC to DC) Power supply, & I've attached single(1) Peltier Module (TEC- 12706) - 12V, 6A(Max) with that SMPS But when I gave power to Peltier Module without Heat Sink via SMPS (Power Supply), it works for few seconds & then it stopped (Heating &...

I need an SMPS circuit diagram to drive a DC motor of 24VDC 20Amp with an input voltage of 100 -240 volts. Consideration be given to commonly available Transistors/ MOSFET and switching controllers.

Hi All, I am trying to setup my Sony N500 Xplod Car Amplifier in home environment. I have presently a 20A fuse placed in a 25A socket of the Amplifier. Its input is 12V. So I believe a SMPS of 25A 12V will suffice its working. I am intending to change the 20A fuse to 25A as well to support...

Hello! So the other night me and my wife had gotten a tread mill (Nordic trac elite 3700) off of Facebook marketplace for $50 and I tilted the walking track upwards last night and for some reason the incline motor decided to continuously lower itself. It appears it Endlessly increased its draw...

Hello everyone, I have a problem with understanding the power factor of a switch mode power supply. More specifically, a phone charger. So it all started with me trying to measure the efficiency of my phone charger. I just measured the voltage, then the current after loading the charger at...

Hi Experts, I've SMPS (AC to DC) which gives output of 12V, 20A, 240W, & I've to attach Peltier device (TEC1 12706) with SMPS, but Confusion is Peltier have max. Current rating as 6A, but SMPS is giving 20A, So how to limit o/p of SMPS to 6A, so it wont damage Peltier, how current regulation...

Hello, I have a power supply which have V480LA10P varistor connected at input between line and neutral but I want to replace it with the V480LA40AP from same family. Looking at datasheet they seem to have almost similar characteristics except for "Peak Current 8 x 20µs" and "Energy 10 x 1000µs"...