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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
look for some old / bad FM radio .. or smps (could be computer smps or even mobile or laptop chargers) a chargeable battery powered circuit will also do
Dear all.. greetings..!! i have been suffered with capacitor calculations.. as i m getting confused by reading too mch books.. i want a correct direction to select the capacitor to minimize the ripples... also the tolerances considerations for i/p and o/p... waiting to hearing you sooon..!!
I have generated 311vdc from 12vdc, now my aim is to convert this dc bus into modified sine wave with the help of full bridge and sg3525 ic ..please tell me how to proceed..I have also made full bridge circuit how to drive the 4inputs of full bridge from sg3525 in order to get modified sine wave at the output.
If you have a 'blue block' directly across L&N then it is most likeley a MOV suppresor. If its across L or N to earth connection then it is probably a Y class cap. For 12v @ 2A you could use smps solution from PI. Check out have 12v supply design 'ready to go'. Already built, tested with results.
I can't use any switching mode of regulating the voltage. This will introduce high noise levels. The power supply must be of linear type. It will have two additional connectors to sense the output voltage when using long wires. The cooling will be made by using fans. However I considered to mix switching and linear mode. (...)
You can consider Offline smps. The transformer used in Offline smps is very much smaller. Try to look at those modern handphone chargers, they're light and small. And, you will have isolation from high voltage for safety purpose.
Primary side isn't specific to high voltage output, I think. So it's similar to other low power off-line smps. At the secondary, a cascade rectifier could ease transformer design.
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
Generally in flyback smps we see a 10E or 20E/6W or 3W series resistance placed in series with phase to limit inrush current in MOV. But how do we select the wattage of the resistance because if by simple calculation we go we dont get the wattage anywhere near to 6W, so how the wattage is decided. Please provide me the answer with calculation
These resistors are used to reuce the inrush current from input dc bulk capacitor which is placed after bridge, usually when the smps is off the capacitor is descharged & acts like a short when you first switch on the power supply till it gets charged to the bus voltage (VAC X 1.4 aprox) To limit the inrush current calculate R at nominal (...)
A usual isolated flyback smps with a casacde rectifier should do. Add a passive filter or preferably a linear post-regulator to reduce ripple.
Hello, I once Acceptance Tested An smps unit which was for supplying a TWTA. I was not allowed to see circuit diagrams due to confidentiality. The output of this smps was 13KV. It was said to be a 1KW smps ?.The thing is, the unit was around 50cm by 42cm by 15cm. How could such a huge thing have been just (...)
Hello, I am making an offline LED driver at 20Watts. It feeds off UK mains 230VAC. It consisists of two simple smps's in cascade:- First after the mains diode bridge there is a Continuous conduction mode, current mode flyback with a 40V DC output. This stage switches at 100KHz. Then this 40V is the input to a current mode controlled B
Can a smps ferrite-core tranformer used in reverse? Eg. can a 230v/ 12v smps transformer used in reverse (assuming that the same switching frequency is used) to get 12v stepped up to 230v? as anyone try it out? Thanks.
you won't get more than some hundreds mA with a transformless power supply. that's it. now you can take a look at smps as FvM said. they are now very compact.
Hello These two smps PWM Controller IC’s have high voltage starter modules for supply at start-up:- TEA1530 NCP1271 However, I do not need this feature, since I have a DC supply of 12V that I can use. No PWM co
Why do some laptop power supplies have a 3 pin AC connector and some have 2 pin (IBM T42). The 2 pin has no neutral line connection. Does this mean, it is more prone to shock than the 3 pin?
You probably mean something like Google Translate which has a small output transformer Also chec
Hi, Please can i confirm that this is a viable method for TL431/opto smps regulation with output voltage of 36V...................................... (The TL431 is only good up to 36V) TL431 DATASHEET:-
Hello, Do you know where I can source high-voltage , low-power 1 MegOhm resistors for paralleling with Y caps, which bridge the primary ? to ? secondary isolation barrier in an offline smps? These resistors must withstand the 3500VAC HiPot isolation tester. -Though I cannot find resistors that meet this voltage (...)
Dear Roberto No problem with your choice , it is respectful in my mind . And about design programs : i didn't use them until now , because i love design all things with myself ! :idea: So why you didn't try to design them simply and with yourself ?! is it hard ? no , i shared a simple way that i currently using for all of my smps designs ! see b
Hiz. how r u all? i want some help regarding smps. im using PUSH-PULL terminology to make 12Volts. i want multiple output voltages. +12V, 5V and 3.5V. kindly tell me any terminology to do this. thx
Why not an smps ? it will be smaller and economical . Best Luck Goldsmith
PFC switchers are generally providing regulated output voltage - within the limits of the design topology. The DC bus voltage must be above Vin,peak by nature of the PFC switcher circuit, so a usual wide range smps (Vin = 90 - 260 VAC) has > 365, typical 400 VDC bus voltage. The PFC principle involves also an output (...)
Hi Ahmed No ! that's not surprising ! because as Brian mentioned above , the circuit is kind of smps which will work with high frequency voltage , so transformer will be small . Best Wishes Goldsmith transfomer always be in the input stage working with the AC but not in the output with the DC !!!
I can't be specific without a schematic but in general, when an smps fails to start up, the culprit is usually a dried up capacitor on the primary side. Most of this kind of PSU need a 'kick' to start them running and it usually comes from the current flowing through a capacitor as it charges. The lower value when it dries out means less current an
I must make a resistive smps test load which is to be 650W maximum. The Load will have a 50KHz sinusoidal current in it which is 1.9 Amps RMS. This is a constant , regulated current. The voltage will be 342V rms. The load needs to be comprised of about 13 individual resistors. We need the ability to be able to short out each of these res
hi,in this condition,a high efficiency smps is a good choice.somechips from maxim and linear tech works i remember,they have some article about get a 5v or 3.3v from serial port use a stepdown chip,it is easy.try to visit : to find fact,any low quiescent current high efficie
this is not an efficient approach will cost much and will produce so heat so you will need large heatsinks and finally you will have a large expensive circuit. you must use switching power supplies. i recommend fly back topology for your application. but you must read some about switching power supplies if you don't have enough knowledge ab
If you intend to use the PSU for an audio amplifier, it will be better to use the classic one with transformer, bridge rectifier and high value capacitors. A smps, cannot stand the peak values demands of the amplifier.
Hi all, I want to design a smps with these specifications: Input voltage: 3 phase 380V (Line to Line) Output voltage: 10VDC to 100VDC Output Current: 400A Output Power: 40 kW (= 400A x 100V) Efficiency: larger that 90% at Full Load (= 400A x 100V) Any block diagram or idea?
Thanks guys, Anyway I need the 13.8VDC smps circuit which can deliver high current (>10A) to be used in the workshop. I intend to 'modify' the PC power supply because they are cheap and readily available. I found one article which 'rip--up' an AT PSU and convert it to13.8V 20A power supply! However it involves re-winding (...)
hi every body, I design a smps push-pull the problem is when the transformer is switched a peak appear ... a least 400V, what can I do to avoid that ? change frequency ?
I am in trouble again. I have a smps regulator, which is then followed by a linear regulator (quasi LDO). The problem is the high frequency spikes (smps regulator has a nominal operating frequency of 200kHz) feed directly through my linear regulator. I am trying to design a linear regulator that could have about 60dB smoothing from 200kHz (...)
Hi , I want to 1 KW implement a switching power supply, with typical output DC voltage of 28 12 and .. where Can I start from? (I am new in the field!) Regards,
To my opinion, it's misleading to designate the circuit a flyback converter. It's usually understood as push-pull converter and operated as such by keeping the stored energy low respectively the main inductance high. It's very popular e. g. for kW arc welder converter. I prefer to draw the primary as a one-quadrant full bridge converter. It'
hello, i am making an offline smps. When i switch on there will be inrush current so i want to limit it. -but not using an NTC as it has no protection when smps is repeatedly power cycled. However, the limiting circuitry will otherwise be a lot of components.....relay, relay driver, resistor, power supply for relay etc ...or if i (...)
also may want to browse through back to 1984
In practical terms you are right of course. I probably did not explain very well. What I meant was that the PSU should always be a few hundred millivolts higher than the battery. Ideally for any reasonable charge you would need around 15v. This may of course be perfectly ok as an input to a smpsu. I have used this method to add backup a battery sup
Switching circuit and transformer can be quite regular, you should use a multplying rectifier (Cockcroft Walton Multiplier) to reduce the required AC voltage respectively the winding ratio. I would use a standard high frequency transformer for an off-mains smps, reversing primary and secondary.
If you are using the 18F to control the smps, then it is equivalent to automotive application. If you have enabled the WDT, the WDT is resetting the uC and not letting it hang. You will have to recover from WDT timeout and continue operation. Use the TO bit and recover your process. If the reset is due to WDT, bypass certain registers tha
@cameo_2007 Your AC power is first rectified into pulsating DC. Then after filteration you get a DC supply, then you use regulators. I'm talking of a linear regulated power supply, in this case.smps decision on it is beyound the scope of this topic.These units are suspectible for normal working for less than 10ms, if you cut off the main AC (...)
smps stands for Switching-mode power supply The main advantage of smps over ordinary PS is that it has greater efficiency because the switching transistor dissipates little power when it is outside of its active region (i.e., when the transistor acts like a switch and either has a negligible voltage drop across it or a (...)
If 317 got hot,you can use a transistor(2SB817) as a pass transistor,Regarding constant current switching supply,that can be made with Tl494 or Ka7500 ic.but this curcuit need high frequency transformer(ferrite core chopper transformer,almost use in cpu smps).
hello frnds, If we need 5 V smooth power supply of 2 ampere . What would be the best option: 1. use smps output 5V dc directly....and filter it when its entering board using 10uf ,0.1uf. 2. use some regulator like 7815 (but its op is 500 mA approx). The circuit has to drive 16 bit adc ad7796 ....please suggest best power (...)
Hi, So you have to make a converter with rating 13.8x25 = 345watt. The choice at this power could be 2-switch forward or half-bridge. Half-bridge would be simpler. First, we have to know your previous experience and expertise on smps.
I mean to say a dc coil You didn't, except for a mysterious question title containing the term DC. If it's a a contactor or solenoid coil, you'll want constant DC current (rather than constant VA or W), strictly spoken. I'm not aware of a simple solution to achieve constant current with high effiency without a controller cir
Hi, I wanted to modify the input power range from 120v to 230V Panasonic cordless phone charger smps type, which is currently supporting only 120v AC. I have opened the charger and tried to find the similarity with Nokia charger(100-230v), but not much information. It has UTC MJE 13003L - high voltage Fast-Switching NPN Power Transistor. (...)
Expanding on what the other have stated: When the current is turned on and off through a diode, particularly when it shuts off because the polarity is reversed, there is a tiny delay before the diode responds. In that tiny delay it behaves more like a resistor than a diode. It happens extremely fast, often just a few nS pass before it starts or st