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I'm trying to fix an old Panasonic LED TV, mainly for educational purposes.
While I was checking voltages on the P-Board I got to know the voltage of the SRV-16V rail is 13.2V (with and without dummy load).
Both 16V and 24V rails are bit lower than specifications. However the 5.3V standby line...
I have a 'Voltcraft VSP 2405HE' dual output bench supply where one of the PSU's is unstable. The PSU has 2 independent TL494 based SMPS boards, fed by a shared primary bridge rectifier and active PFC board. About two times a second the output voltage of one of the PSU's jumps a few 100mV, which...
i made 220V AC to 12V DC 5A SMPS based on UC3842 using forward converter. schematic attached. supply's output voltage is ok and on no load (except indication led) pwm duty cycle is 1.1% with no mosfet heating (IRF740), but when loaded with even a little load of < 500mA, mosfet heats up although...
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...
Hello,
I am trying to find some information on building a Toroidal Transformer from scratch, so that I have exact parameters needed and something I would like to learn as a hobby and skill. Please don't say to go buy one, I could if I wanted to but will never know how it is made and why it...
Hello
I am trying to repair a smps power supply based on UC3825A
Problem is the resistor R49 & R34 get burst as soon as i start the smps
I am not able to find out the issue
SYS_ECON is a 0-5v given from MCU desired by user to control 0-180v smps output
Please I have some couple of 3.6v 3Ah cylindrical li-ion battery, but since I bought them, charging it became a huge problem. I first connected a single one to a 2A infinix phone charger (made in china. According to the ratings, it capable of adjusting output current and voltage to load)thinking...
Please am studying about switching power supplies, starting from the simple ones. I've just concluded on joule thief and blocking oscillator, now am progressing to Self oscillating flyback converter(or RCC) and am finding a bit difficulty on how the transistor switches OFF.
It seems the...
Hello,
I am in the midst of creating a synchronous buck converter. The requirements of the converter is the following:
Vin = 30V - 50V
Vout= 3V - 5.5V
Io >=12 A
Now the power stage works perfectly with ideal as well as realistic components. After investigating that the power stage works, I...
I have a peltier cooler TEC1-12706.
I used an SMPS which can give 12 Volt and 20 Ampere. While I am connecting the peltier and cooling fan(Parallel) the cooling fan is bouncing along with the smps(It seems like smps is restarting).
I assume people will say the smps is damaged. But it is working...
I am working on an Active Clamp Forward converter. Schematic is given here:
Specs:
Output voltage-5V
Input voltage 26..42V
frequency=500KHz
Output power=10W
It is working fine in open loop, but in closed loop I am getting a ripple in output Voltage of 2.5Volts Peak to peak.
Voltage...
In case of a smps transformer of 1:2 primary and secondary turn ratio roughly the output voltage will be double & current will be half of input.
My questions are what effect will be on output, if
1) Frequency increase or decrease (when duty % is constant)
2) duty % increase or...
I am trying to repair a Bose Soundtouch whose smps shuts down. Unfortunately I do not have a circuit diagram and Bose do not provide one.
This set has two ic's, TDA3100d2 to power the tweeters and TDF8599B to power the woofer, both of which are getting power (24 volts) from the same smps...
hello guys ,
Here is the situation, I am working on a 90 watts , 1050 mA , 72 V flyback based constant current smps which is used for outdoor LED lights,
Mosfet used 12A 800V
O/P diode used - Average forward current 8 A , Peak revers voltage 400V
In this design diode and Mosfet are getting...
Hi,
I work as inverter and dc / dc designer, but I'm new in three-phase motors' subject.
I should make a project sketched in the figure.
the characteristics of the motors are in the picture.
I say the pilot will be in open loop.
how are the discrete components (MOS or igbt) dimensioned in...
Hi
I want to buy 2CL2FM .
http://www.hvgtsemi.com/upfile/pdf/2012110817253555456.pdf
Trr =100 ns
I want to find out the real switching frequency of the diode.
Can I apply it in the smps with 100 khz of switching frequency?
Regards
Hello all ,
I wish to design a switch mode power supply , dc-dc buck-boost converter, ('with Vin - from 12V to 48V ) and Vout from 2V to 20V with Iout - upto 6A, There are many IC's available from Ltspice and Texas Instruments. I have design the block diagram , but I am not sure what should be...
Are this Chinese made SMPS power supply compatible with LA 4440 IC? I mean that can I use it for any audio amplifier or Bluetooth mp3 FM module? Please tell me! If I can use it, then please tell me how I can do it?
Having a problem finding the problem on the power supply board. The board turns on and off in a 2 hz pattern. Checked the input capacitors and they are all good and never drain even after remove the input supply. Tested all the mosfets and they check out good. Checked the opto isolators and...
Hello,
I have a little problem.
I chose a project for school which I've managed to get working...
All the circuitry before and after the SMPS is working properly,
my only concern here is, that the SMPS is only working at an efficiency of around 54%.
I've added my schematics for the SMPS...
This is my first post :)
I'm not going to be begging for help to be babied all the way. I did Dick Smith Fun-way electronics kits (Australia) as a kid, but when you are working with mains you have to be very careful making the smallest changes to a circuit design. Hence I'm asking for a few...
I'm a little rusty on noise problems from switching power supplies. And I hope someone can offer some advice. There's this new system which relies on a small +12v smps. This system has a separate controller board mated with a motor controller using board connectors. And the 12v smps connects...
Hi,
Does anyone know of something to convert 240V mains to 15V DC at upto 2A? I want it to be as compact as possible.
I've been looking for PCB mounted modules but the price and size of them seems ridiculous. For example; Farnell sell a VTX-214-030-115 for £20.
You can buy a whole bench PSU...
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