1. A

    Determining Amplifier Input Power

    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...
  2. J

    Mc2100ls-30 tread mill control bored pretends to me a sparkler

    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...
  3. florian_1034

    Power factor of a SMPS

    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...
  4. Vish Ram

    SMPS Current Regulation

    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...
  5. Younes Thabet

    Can 2 varistors with same Vrms of 480V be interchangeable?

    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"...
  6. Neddan

    Increasing capable SMPS from rated 12V ouput to 20V via opto-coupler feedback

    Hello everybody. I am trying to increase my power Supply's default 12V 3.3A output to something like 20V 3A. I Decided to use a potential resistor via the shunt regulator at the opto-coupler which i was sure it had. But the problem is that when i opened the power supply, most of the output...
  7. P

    How PFC responds to Load power demand in SMPS (flyback) converter

    I tried to understand PFC in an SMPS voltage converter. I read from many websites but still confused very much about the following things. Situation: it’s an SMPS flyback (for example) converter, to output (for example) 24v dc to an inductive load of 100W (average). Input 230v AC mains 50Hz...
  8. A

    Making electromagnet and not burn the Magnet

    Hi All, I have made an electromagnet of using 1 mm diameter wire appx 60 turns. here is the problem... i have 600W smps(computer power supply) and i want to use that to power my electromagnet. On smps it shows 3.3V with 25A and 5V with 18A. If i connect my electromagnet to one of these terminals...
  9. M

    No B+ Voltage on CRT monitor

    Hi, I have a crt monitor that dosent work now, I figured out that a mosfet was running very hot and was shorting the smps(making it stop and restart), I removed it and saw that theres no short circuit now and the led/buttons works but theres no picture, it's the mosfet that generates the B+...
  10. kamranM

    Start-up and steady-state models of microcontroller

    I've been looking at UCC28C43 models provided by TI. Why do we need two different Spice models such as "Transient steady-state" & "transient start-up" for MOSFET driver IC? How do we use them? When do we need these analyses? Do all microcontrollers in power electronics have such separate models...
  11. Younes Thabet

    Can secondary side wires of SMPS transformer be interchangeable?

    Hello All, I have an SMPS that i want to change its transformer (image below) in the original transformer, pin 7 is connected to ground and pin 9 to a rectifier diode. with another transformer (image below) Now, the primary of both transformers are similar but the secondary of original...
  12. ashokraj

    what is the difference between these two supplies

    I am wondering how will these two differ, One is Ac to DC converter module, second one is SMPS. Link1(AC to DC module) Link2(SMPS) when link 1 is available in a small size than Link2(SMPS). Under what circumstance we have to use Link1 and link2. I understand that SMPS is 5watt, Link1/Module...
  13. A

    PSFB converter not working as expected in TINA TI simulation

    Hello Everyone, I am currently working on a 2.5kW PSFB converter using UCC28950 ic from TI in TINA simulation (unfortunately couldn't get a similar model for LTspice). The simulation is working however I am not getting the desired results (i.e. Vout = 84V and Iout = 30A). I have a uploaded a...
  14. Younes Thabet

    Why Power supply have unreasonable no-load input power consumption?

    Hello all, I have a SMPS power supply based on the TNY276 PMIC, I did a "No-load input power consumption" test using DMM connected to AC line input to measure current values while varing the input voltage from 85VAC to 265VAC... I got the following results: Input Voltage (VAC) Input...
  15. SMPS Lover

    SMPS Transformer noise and Low output voltage

    Hello, i have an issue with a 12v30A PSU: low output of 4v instead of 12v, SMPS transformer noise like low frequency issue. No short element in the secondary, RT/CT of tl 494 within specs, but i suspect the capacitor at VCC of TL494 : it is only 10mF and has only 7.5V. The DC output voltage...
  16. E

    Serge and spike protection to controller board

    i have developed a small board that has a controller and a 16x2 display. I am powering up the board using external smps power supply. I want to add serge protection, so that my system will be protected from any time of serge or spikes. One option is i can use fuse but i want to know what else...
  17. A

    SMPS POWER SUPPLY issue help needed

    Hello i am an engineering student working on a project of Switch mode power supply with outputs of 12V 1Amp .For this reason i have used power integration software to design smps supply circuit *(Schematic attached )with 12V 1 Amp required outputs. I have implemented this Circuit on PCB as...
  18. E

    Buck Converter from 48V to 5V

    I am using Arduino and Controlling FAN which works on 48v. so i am using 2 power supply smps in my design. One for Arduino that 5V smps and another for FAN that is 48V smps. I want to use single power supply in my design that is of 48Vdc. I was looking for a buck converter that will take 48V as...
  19. Younes Thabet

    How to calculate primary current in an smps transformer?

    Hello all, I have the following 12V center-tap transformer with below number of turns, I used (Np/Ns = Vp/Vs) to calculate output but i didn't get 12V although transformer specification says it's 12V. Can someone point out where I have mistaken? Also How can I calculate primary current given...
  20. J

    Tips for bipolar power supply

    Hello, I need to design a linear regulated supply to power an dac output stage based on op amp. It must be a negative + ground + positive one. The problem I encounter is that I don't know wich topology to select between the first and second arrangement. I suppose that the first one induce a...
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