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1000 Threads found on edaboard.com: Voltage Smps
has anybody here worked on high voltage smps power supplies (8kV, 5mA).
hi I want to design the smps with below specifications: Vin=220 Vac Vout=1KV to 30KV , Iout-max= 20mA I want to use LLC for it. Is it possible to use LLC for this converter? I want to calculate resonance elements and transformer turn ratio and primary and secondary turns and inductances. The maximum voltage and current that drop on resonan
V(in)=24v DC I(in)=10A (two sealed acid battery) V(out)=2500v DC I(out,max)=60 mA which topology can I use? please describe it a little. Input voltage low therefore pushpull topology good choice for this application.
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.
I have an smps adapter of 12v 1a with a fault ic of constant current voltage smps (6 pin smd IC). how to make it work again by modifying the circuit without ic .smd removed in the figure. it looks like ap4313.
I'm having basis electronic knowledge & i can understand what happening inside of a smps, but still i can't start my first own smps design. I fear to start my design, its because of the risk of high voltage. Please provide some ideas for beginners... Where i can start for learning, from transformer or electronics circuit? I believe (...)
Use any D/A converter and feed the attached circuit with voltage .. To ensure 40A current capability you will need to connect several power transistors in parallel - hence a power transistor array .. Regards, IanP
Apart from needing 14 - 14.5 V output, the smps must also be able to deliver constant current, it must have a current limiter rather than a overcurrent shutdown. Some smps can, some can't. A PC powersupply probably hasn't a usable constant current mode. The smps must also allow increasing the output voltage, e. g. by an (...)
Hi I dont recommend you to design a high volatge circuit best on smps it can be dangerous work Any how you can go and find a referance design for high voltage smps in ON- SEMI site All the best Bobi
In the following article, Dr Ray Ridley, the world's pre-eminent smps designer, slates the use of Bootstrap High Side Driver chips such as NCP5181.Never heard of him. Dr Ridley states that with mains voltage smps's, its always preferable to use gate drive transformers.It's surprising to hear such a
Hi, I want to construct a CC-CV smps using TOPSWITCH similar to one shown in (Figure 11-Cellular Phone Adapter). There is also an Design Idea numbered DI-8 from Powerint for same thing. The effeciency of given circuit is 60% and I want it to be more than 80%. There is one point in
Why should put a voltage regulator for Vcc supply of smps control IC.. as voltage supply from the aux winding is quite constant??? What is the purpose for the regulator as normally we can see in most of the smps design??
Hi, How do I can get 5,00V x 20A with remote voltage sense terminal and using a PC AT or ATX smps? Usually this psu have an output voltage of about 5,10V up to 5,30V! I'll not use +12V, -12V, -5V, 3,3V and remote ps on only power good output
Kindly give the concept of a wide range smps. The smps should work from an input voltage of 10V- 40VDC as well as effectively from 10V DC to 350VDC. The output voltage requirement is 12V ( If 12V is not possible outputs can be 7V also ) Total output power is 10W. Please help me by sending valuable suggestions/ Clues or (...)
Hi There are current mode control & voltage mode control in smps design. and In current mode control, Since the error amplifier is now used to command an output current rather than voltage, the effect of output inductor is minimized. -> single pole (the book said) I have a question that why 'the error amplifier is now used to (...)
Hi Friends I want some help regarding high voltage/wattage smps smps rating are 48V/200W and 48V/1000W>please send me any reference designs and some details for study.Also tell me some study links Thanks in advance Vaibhav
Hello, I was reading the following article (below) which states in the first paragraph that "Current-mode control is the best way to control converters, and is used by most power supply designers" ....this seems like a sweeping generalisation to me, and i am told to design an sm
hi, r u trying to make isolated one? if i think you can achive voltage as low as 1volt which is the forfard voltage of opto coupler usually
Hello, I am doing smps’s running from 230Vrms Mains. Please could you tell which of the following scenarios is safe? -also please indicate those that violate UK laws. Xxxxxxxxxxxxxxxxxxxxxxxxxxxx Scenario 1: If I make an offline, non-isolated buck converter with +20V output voltage , -and supposing I touch this +20V output v
Hello, Do you know what is the legallly allowed level of secondary voltage from an offline transformer isolated smps? Is it OK for an offline , isolated smps to have a 80V secondary voltage , which gets converterd down to 40V?
Does anyone have an inexpensive smps circuit to accomodate a very large input voltage variance (120 to 660vac)??
HI dear universally 1. Calculate the o/p capacity (Watt) 2. Assume efficiency which is whole s/m efficiency. 3. Finally calculate the i/p watt of the s/m. 4. you have i/p voltage which is variable for closed loop control. Take min i/p voltage and find max. i/p current flow.
I want to get 5V and 12V voltage from computer smps.How can I get that?I am confused with the pins on male connector.
That behaviour is because the feedback stage only consist of a opamp integrator. Reducing R3 will reduce the time of the spike. An integrator's output voltage will increase over time, depending on relationship between R3 ant opamps feedback capasitors. That also means that ERROR SIGNAL TAKES TIME to get to it's "stable" level. It isn't really n
The secondary ground of an offline smps can flot up to dangerously high voltages. Why? An dangerous in which sense? Is part of the reason for the Y-Cap, so that floating up to such a high voltage doesn't occur.................because the leakage current through the Y Cap will stop the secondary ground from floating up to suc
Hi, The Half-Bridge smps is a Zero-voltage-Switch-ON converter. -Because when a FET turns off, the primary magnetising current continues to circulate, and does so by forward biasing the opposite FETs parallel diode.... ...then when this FET is turned ON, it obviously has zero volts across it , because its diode is conducting. So why is
Hello, We are doing an offline 330W half bridge smps which is to have an output voltage of 40V or be set with a pot at production. The lower feedback divider resistor will comprise two resistors in series, one of which is the pot. I ma aware that this can give noisy operation of the smps, as pot wipers slip and have poor contact.
It's not surprising that there's some AC common mode voltage between the outputs and earth, but it should be a high enough impedance to not transmit much current (if it was properly designed). 80VAC seems like a lot though. I would try probing it with a scope, so you can see the waveform in detail. A multimeter probably won't give an accurate re
Hello, Do you know what is the above gain? Page 202 of Marty Brown's Power Supply Cookbook says its " (Vin /delta Ve)* (Nsec/Npri) = (Vout/Vin) " But these two expressions are not the same. Also, what does Brown mean by he talking about the maximum possible error amp voltage, or the particular delta Ve at the Max. Loa
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?
Did the computer ever work with the two smps that you describe? For how long? Kind-of odd if they are exhibiting the same 'fault'. Are you measuring the voltage levels with the smps connected to the computer? Are the two smps designed to handle the power requirements of the computer? Are they the same model? Is the third PSU (...)
hi i just connected my fully functioning power supply lambda EWS 1500-12 , 12volt 125A smps to charge my 12 volt battery its 150AH, after a bit of charge when i disconnected the power supply i noticed low voltage on output of smps with multimeterm it now reads 8v wier th battery removed i tried to increase the voltage from (...)
my Lambda power supply 12V, 120A, 1500W smps was used to power my 12v car amplifier used in home for subwoofer. I attatched it to charge my Car battery 12v, not realizing the smps has not diode protection. the smps kept charging the battery when i switched off the mains.When i switched on the mains the smps did
The energy storage capability would need an exact specification (xx Ws storage with less than yy V DC bus voltage drop). At first sight it seems to refer to unrealistic capacitance values for bus capacitors. Fortunately tripping a 15 A circuit breaker isn't the same thing as exceeding 15 A input current.
I think you cannot do this, if are powering both smps from same voltage source. lets see what the experts say ! goodluck..=)
Hello Everyone, The attached circuit I find in a forum and it is working satisfactorily with Mains AC 100 to 150 Volt & 175 to 230Volts. But I noticed a problem that from the voltage range 151V to 175VAC this circuit stops working. Why? I do not know... Can someone explain me what happens among this voltage range I am using variable transform
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 smps PCB might have an on-board potentiometer that you can adjust to change the output voltage. If not, you can adjust the values of the feedback resistors to get 21V output. Hope this helps. Tahmid.
Actually he did answer your question in post #4. The output voltage depends upon both duty-cycle and turns ratio. Here's
HI All I'm having a 600W 12V smps. I was wondering if its possible to have a variable output voltage using the same smps. Say I have my minimum output voltage requirement is 12V and it should Vary till 24V. I thought of Cascading a Boost Converter to the output of the smps. The Specs that I decided are as (...)
Did you try to add some load such as light bulb for example and measure voltage ? Inverter is commercial (what model ID and manufacturer?) or DIY ? Best regards, Peter
For a Full Bridge smps in current mode, as opposed to voltage Mode, we can say that with Current Mode, we no longer suffer the double pole of the output LC stage, because current mode control cancels out one of these poles, meaning that we can more easily compensate the feedback loop to attain this correctly worded?
In the third page (top left) of the following document, it says that the crossover frequency of voltage Mode smps's must always be above the power stage LC resonant frequency.......... (its actually called page "24", even though its only the third page) ...Isn't this missing somethi
Is the current measured at AC input, 230V, or at 12 V DC? For the variable AC input from 180 to 280 V AC the best device is the "variac", mechanically adjustable AC transformer. Such devices are available for up to 100 W power. For a "constant' DC of 12 V (what load?) you need to use a DC voltage regulator, 7812 or adjustable LM317T, with a DC inp
Hello Again to All...Please help me understands more. What could be the most possible root cause for the smps power supply voltage drop under load? Vout is measured 5V without load. But when load (2ohm) connected can get only 4.7V...This smps specs is 5V, 20Amp...Please share your knowledge...thanks. As L_jack_xi
I need to design a smps that can be used to convert 12 vdc to 160 vdc (followed for a dc to ac inverter}, but i want to get reversibility. Is it possible to use the same transformer for a 160vdc to 12 vdc to be used like a battery charger? Maybe with a different winding in the upper voltage side of the transformer, to get isolation between line inp
1200V/1500V film type capacitor would be fit. Capacitance is up to load current and ripple voltage. Good Luck! On 2002-04-06 15:53, Cirkitron wrote: Hello Fellow Members, I have a step-up 120v to 1000v transformer with a current output of 1.5 Amps. I would like to convert the output to variable DC. What type/size of filter cap
hi,you can visit: h**p://www.smpstech.com h**p://www.powerdesigner.com maybe you can find someting useful for you. i know the transformer design have many rules,flayback have it;s own rule,and forward is quite diffrent from that of some case,secondary are more wires than on the primary.for example, the voltage of primary side is 12v
hum you cant add a 12 v regulator is my advice it isnt so easy as the switching transformer will still supply the top voltage even when the stages drive is reduced so the lt will always remain the same the regulation stage in one of these switching psu is purly to give the current the transformer dictates th
First of all, is the flyback operating in continuous current mode or discontinuous current mode? How certain are you that the problem is really oscillation? Did you see the voltage at pin 1 of the 3845 controller actually oscillate? (Careful when you check that, if this is an off-line P/S). Is it possible you just hit current limit because of too


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