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389 Threads found on Voltage Smps
You need to understand Ohm's Law and basic electricity to see how much current is used. The rated current of a power supply is the maximum current it is allowed to provide. It does not provide that much current all the time. Ohm's Law says that the current is the voltage divided by the resistance. You have a load that uses 600mA when the
Hello, Please can you confirm that when the primary FET switches off, the voltage across the leakage inductor, which resets the leakage inductor, is the (RCD clamp voltage) minus the (voltage referred from secondary to primary)? ....and if these two voltages were equal then there would be no voltage (...)
In case of doubt, a solid ground plane won't be bad. The LED driver circuit can't work. The IR-LEDs have only 1.2V forward voltage each, so a simple series resistor from 5V would be the appropriate way to supply it, or a buck converter if minimal power consumption is a must.
Hello, We wish to scope the voltage across the output diode in our offline , isolated flyback smps. (to see how high the ringing voltage goes) Should we use a differential probe, or will it be accurate enough to simply connect the actual scope probe directly?
I want to know the maximum voltage and current output of a desktop computer power supply.
So it not going to be in very harsh conditions... Will have to re-read the spec to get pollution level If the board develops cracks you are going to be the unluckiest designer in the world.... because it would be the layer to layer clearances that would be affected and if you have high voltages then the design should be done so that cracks etc. do
NOT quite. He states how it is more useful to skip the frequency domain simulation and start with time domain simulation to optimize stability of overshoot. He points out how to stay in "current-mode" so that it becomes inherently stable. Use variables are input voltage and output step currents. Design choices depend on priorities, cost, per
What are you using it for. If just basic scoping low frequency signals then almost anything will do. If you want to depict ringing and peak drain voltage spikes in smps's then you will need high bandwidth. Beware some of the Far eastern ones where the save_waveform feature doesn't work on windows 8. Do you need sample and hold....if so, don't buy a
You can use an isolated gate driver like TLP2200. Problem in any case is that you need a low voltage supply for the gate driver. Usual solution in regular smps: Startup circuit is deriving the supply voltage from input DC voltage by a series resistor + Z-diode, in operation an auxilary transformer winding is supplying (...)
Full Bridge smps primary DC blocking capacitor...(capacitor in series with primary) Does any reader know of a book that explains ...... 1. Whather or not this capacitor is needed in voltage mode control? 2. Whether or not this capacitor is needed in Current mode control? 3. Whether or not this capacitor is needed in Current mode control
it means that you have an smps where as soon as the inductor current falls to zero, the driving voltage is again forced across the inductor and the inductor current begins to build up again. So the inductor current falls to zero , but does not languish other words, the inductor current is triangular and not trapezoidal, and there are n
I could not find the proper spec sheet for transformer which determine the power or voltage current rating of transformer. I also could not find the turns ratio. If u know the cross sectional area of input and output coils with their length, the resistance of coils can be found. Using these values u can determine the VA rating and with power factor
Hi all I have some stupid question about ac-dc conversion. As you already know, diode-bridge is connected to AC line and rectified voltage is go through flyback stage in case of flyback ac-dc smps. - AC Plug -> Diode bridge -> Flyback stage Then let me write a stupid question. How about below construction? - AC Plug -> transformer
Why don't yu try a Linear Adjustable Regulator just after this smps ?? You may design your smps ( for instance 85-270VAC )then you can connect a variable regulator then.. smpss work still rectified line voltage so DC.Flyback is a good choice..
i have a power supply in which driver ic is ICE3BR0665JF AND FB controlled by TL431. its a 18vdc,100w smps.i want to use it in project where i need 24v dc it suitable to use if yes how to change its output to 24.what about its performance. if any other circuit plz suggest its urgent
basically this inverter incorporates high frequency intermediate stage , however the output frequency is still 50/60 Hz, In this inverter , basicallly there are 2 stages , 1) DC-DC stage 2) DC-AC stage in first stage a lower voltage dc say 12V is converted to 311VDC now in second stage the 311VDC which is a peak value is converted into 220V
Dear Friends , I have a circuit which works as following : Mcu board : reads temperature via pt100 sensor , shows temp on lcd and it has to print the data on a thermal printer . Mcu board is working on linear power supply which powers voltage to pt100 circuit , mcu , lcd etc. The thermal printer requires 5V , 2A of current so i am using a pc
I've done googling...Majority telling only 3 important things must consider then it'll work: 1.) voltage 2.) Current 3.) Rds-on resistance Any opinions on this? Thanks. I agree with previous posts but would like to add the following concerns that ought to be checked. - If significantly lower RdsOn,
Feedback is more complicated in a boost converter than in a buck converter. One issue is that your desired Vref does not exist for the first few cycles. When you finally have your Vref, it cannot be applied directly to your control device, since it is outside the supply rails. It must be divided down. Vref (voltage regulation) is one type of feed
I want to control voltage (CV) and current (CC) using TSM103 at smps output. Please help me design calculation . I have to CV/CC at smps output having 54V and 1.4A.
hi , i have built a half bridge smps with pfc front end for 2 X 200W class - D . it works fine but the wave forms that i see is troubling me .... Can any one have a look and tell me if i am doing it wrong ..... the smps has a open voltage loop . wat is troubling me is primary waveform at 90% load the wave form should be flat during the dead (...)
If the turn ratio of the transformer is wrong and there are more turns in output coil than needed then it will produce higher voltage level in output. The feedback circuit will try to regulate it by reducing duty cycle and you will see a narrow pulse of PWM output especially when there is no load present. .
I think, the shown circuit has sufficient protection, even if the signal pins are connected first. What you can expect at the maximum is a few nF smps Y capacitor charged to the mains peak voltage which will discharge through the 6.2 k resistor. Stored energy is below 1 mJ, no problem for a 0603 resistor. The Z-diode will safely protect the MOSFET
Hi I need a inverter for a Mig/Mag machine wil wire feed, I have read this has to be a constant voltage source needed of 22/28 volts. So correct me if I wrong. the constant voltage source is a version of smps with voltage feedback to adjust voltage? wire feed speed take care of current. the Tig (...)
So I connected it between 9V 4.5A DC smps and external camera flash which requires 4xAA cells. To my surprise when flash is charging input current rises to 2.2A and voltage drops to about 2.5V. Is this normal?
I prefer the guru Keith Billings who has 50 yrs smps design experience and many books. The choke must not saturate during Ton and must have enough energy stored during Ton so the voltage does not sag during Toff. Th
I presume you used a design simulator such as WE's component selector which calculates all the losses. Since you did not provide any details on input /output voltage we cannot say for sure. e.g. Why 200kHz? why not 250k? What were your results? <150mW?
TVS will not fix your problem. Preloading your smps for 5% may reduce overshoot. Improving design Phase margin may improve it more. I think you have a measurement error as the LED current would be nonlinear and ringing would NOT be sinusoidal at this voltage >60V. ....Reason is the LED string will probably have a lower ESR than the 500W rated
I presume you have an idea about the block diagram of the inverter. To use the ferrite transformer for battery charging, you need to feed the high voltage winding of the transformer with a 50 kHz AC voltage. How do you chop the mains voltage (probably after rectifying it)?
Every circuit type of smps has a unique input voltage V1(f,t), Z1(f,t) and unique output V2(f,t), Z2(f,t) in s parameters these can either all voltage or current or all impedances where s11 is input and s22 is output for a 2 port device. The forward transfer function is s12 and reverse is s21. Load regulation is due to the ratio of (...)
We are advised to use any input voltage sources.
I see a lot of problems with this design from dI/dt coupling, conductive losses on traces, no short circuit :sad: withstanding p rotection, no high voltage(3kV isolation from arcing. Start over using busbars with common mode paths on opposite sides of insuator yet high voltage insulation with 1kA surge capability.
Do not neglect the possibility of ground rise, if your load current gets into the reference ground significant error can accrue. I would begin with looking at the Vref and its reference ground point, vs load current. Be sure your voltage feedback divider returns to the same prime reference point, physically - on paper / screen, you get a free pa
Hi all, Designed Flyback Topology based smps.Now want to convert smps in to Zero voltage Switching Flyback smps. How to design ZVS Flyback Converter? Thanks & waiting For Knowledge Enhancement,:thinker: Sachin
Hello. for design a voltage mode control compensation network of smps I need calculate forward gain (G) in 1+GH equation that H is compensation network Gain. that for forward gain we have : G = Vin * (Ns/Np) * Gm where: Ns/Np= trans ratio Gm= modulator gain suppose a half bridge smps designed to work for 175 to 280 Volt AC: 1-[
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 dont use anymore 78xx linear regulators today unless I have very low amps consumption < 20mA or so or really adapted to the input voltage no more than 2V, or you're sure it will heat a lot. else I use a smps regulator, they are widely available and cheap and dont overheat search for LM2576 and family.
Dear All, Required Guidance, Design specifications are as follow; 1)Input voltage : 90VAC - 270VAC (Universal Range) 2)Power Rating : 100W 3)Output voltage : 1VDC to 80VDC 4)Output Current : 100mA to 2A If we go with Flyback Topology,which control IC suits best for the application as duty cycle variation is an external function.
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
I am trying to make an smps. While powering the smps ,it is getting tripped. It works same even we power using 230 VAC without driving signals.(gate trigger) After MCB get tripped,if i power the PWM driver board(12V), it works fine and gets some voltage in the output and gradually disappears as capacitor discharges completely. (also (...)
How do you exactly measure the transistor voltage? A small probe compensation error will ruin any accurate voltage mesurement.
In such an smps, the output of the bias winding is often filtered to prevent peak charging of the bias rail capacitor to a voltage that could damage the pwm controller. Is this only done with modern pwm controllers which draw very low operating current?
Expected current at 12V DC is around 4 A according to TEC1 12706 datasheet. If it's considerably lower, the peltier element may be damaged, e.g. due to previous overheating. Or you got a fake device. I presume you have a DC clamp meter. If the smps is a multi voltage PC supply, 12V may drop with unloaded 5V. In any case check the voltage, to
The oscillation has high Q and is stoked up by the bus voltage ripple pulses. The magnitude is too low to cause any problems, I guess about 50 mA (*) rms. Of course it can be reduced by placing a RC snubber parallel to C7. *Actually 25 mA rms.
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
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?
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
Varistors are usually used to suppress voltage transients, so you could use them to suppress transients on the primary side
over what time span would the voltage vary?
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 (...)