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37 Threads found on Smps Variable
Hello The attached schematic varies the reference voltage shown from 0V to 1v5. (In the actual circuit it will be the variable reference to the error amplifier of an smps..thus giving a soft start by slowly incrementing the reference node voltage). Do you have any ?less component count? ways of doing this? I need to keep the LT1634 in there
I have designed adjustable output voltage and curent smps having 500W output. I would like to share circuit schematic since there are many experienced people in smps and power electronics in this forum. Do you have any suggestion about this circuit ? or Do you see any critical fault ? This project may help to people who want to build a project some
I am planning to design smps that has variable output voltage and current. Its voltage will change 0-50V and current will change 0-10A. 120251 Vout comes from output voltage up to 50V. Iout comes from output current up to 10A. Iout will be Rshunt x 10A. Rshunt is 0.05R, so Iout will be 0.5V as voltage. Output pin of 1
Hello, We have had a 3kw offline (85-265VAC) battery charger made for us by a consultancy. They did not give us the schematic. The chargers are failing and we are wondering why. First of all we are trying to assess what topology it is. The schematic that we have determined so far, by using the DMM on the PCB is as in the pdf. However, when we
Hello. I am trying to design my own smps supply and I could really need some help. The smps will be used in a lab power supply with a linear post-regulator, so I am searching for a adjustable smps, I am reading about all different topologies but I can't make sense of which I should go with. Buck I guess but I'm not sure. Also, I (...)
Required external Pot to control Output Current & Voltage. The rating required for Pot are as follows, 1)Maximum Voltage at output = 80Vdc variable Rating required using Pot from (1V to 80V) 2)Maximum Current at Output = 2A variable Rating required using Pot upto 2A Which Control IC to be used for smps to have extrenal (...)
Hi i am supriya, i have a smps with 230 constant input to constant 12v dc output , frequency 50Hz, 2A. But i need variable ac input from 180 to 280 ac voltage to constant dc 12 v, i need a circuit can u plz suggest me.
Hi I am trying to design a 0-30V 5A smps with A flyback circuit. I need a circuit schematic or proteus draws or ares if any help is provided would be apprediated. if you have swixh mode transformer for example 150 W can you send me too Regards Onur
I need a simple DC-DC converter to obtain 12V voltage from a variable DC input voltage. Please don't offer me to use a smps topology, because this 12V DC itself will be powering a Buck converter IC. This 12V will be powering this Buck converter IC and a few opamps; I presume that the load current will be lower than 50mA. i.img
Hey Brad thanx a lot I found an old smps and used its core to wind my inductor. I don't have a LCR meter, but I used my DSO quad and I think that's approximately good enough reading. Now next task that awaits is selection of components. I took out a few mosfets from old UPS and capacitors as well. I could not find currect diodes though for such hi
Hey every one All assistance will be appreciated here i am building a buck converter(step down) to output certain voltages for a particular application .. the atmega is giving the switching element(mosfet) in the circuit a pulse width modulated signal which determines the duty cycle. my output works as expected. the problem lies with when im
I want to build a variable voltage supply with LM317, which takes power from a PC smps, I want to utilize the short circuit protection in smps, but after regulation with LM317, the protection is not working, how can we implement that , after the regulation?
The transformer at mains AC input only changes the voltage. But the smps should work like many smps work from universal voltage range i.e. 110VAC-230VAC
can we make an smps with 30V output using a PC smps and boost converter circuit ?
You should consider UCC3895 and PSM (Phase Shift Modulation). This way you shoud be able to achieve your smps to go from 0V to your designed max voltage.
sir, I want to design a smps with variable O/P voltage eg. 4-30V with variable current eg. 0-3A. So sir I am confuse which topology is suitable for this application. please suggest me some solution. And if u have any reference then please forward me. You can do one of 2 things: 1) For variable output vol
1- Can anyone help with selecting an operating switching frequency? should I run it at 100KHz? I would like it to run at 200KHz so I can use a smaller transformer, does anyone have any objection to that or see any drawback (emi, fast components availablility)?The issue is that due to your wide output range, you'll n
There is a 36V 5A smps which its PWM IC is TL494 and provides fixed 36V output voltage. is it possible to manipulate circuit in order to have variable 0 ~ 36V output voltage?
Hello, please could you help to stabilise my LLC smps simulation. Its in LTspice. I have made it have a minimum frequency by adding a current source I1 to the LTC6908. I then implemented variable frequency by adding a PNP transistor to the frequency changing parts of the LTC6908. It doesn?t seem possible to stabilise it, so I am hopi
hi all i want to design smps with variable output from 1V to 50V. i have seen on the net how to select the circuit element(inductor capacitor) for fixed output. BUT since i have to vary the duty cycle in order to have variable DC, i dont understand how to find the circuit element values.