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has anybody here worked on high voltage smps power supplies (8kV, 5mA).
wich diodes will you use to rectify 2500 V? UF4007? The output schematic is the question. input - push/pull or brige scematic. If the output and input voltage is stable enouth, you can try the ZVS Flyback.
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
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 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
Pease explain me what does mean "over voltage protection" in in AC/DC switching adapter characteristics ? For example I see the following characteristics: voltage : AC INPUT 90Vac TO 264Vac, FULL RANGE OUTPUT REQUIREMENTS:+15 V, RATE LOAD 2.2 A PROTECTION : OVER LOAD PROTECTION : AROUND 150 % RATE LOAD AT 115Vac (230Vac). OVER (...)
Try to connect a capacitor (4.7nF - 10nF at min. 1000V; it depends of your isolation voltage) between power ground and output ground.
I know very little about smps and need to make a reliable smps with these data. Input voltage can vary from 230VAc to 500Vac (230,380,440,480 500). Output should be 24VDC at 2A. All schematics or tips are welcome. THanks for your help.
You can use Resistor,diode,and capcitor(EXT or miller) to design dead time,diode use to fast one director charge,and another director use resistor and capcitor to make dead time. this dead time depended on value of capcitor ,resistor,off voltage of mosfet.
Use a transistor as an emitter follower with a resistor devider to set the output voltage.
Input voltage importand for selected topology. Pushpull is best If you want to use low input voltage. Hard switching technics produce more electromagnetic radiations therefore you must use soft switching type design at the audio and video circuits. If you not limited by input voltage any soft switching methode usuable.
"high gate voltage" will reduce mosfet RDS_on,so it can increase efficiency. Low gate cap(miller cap) can reduce gate drive current,But for same mosfet,Higher frequency will reduce efficiency.
I have a question about losses on a smps I'm developing. This is a 2000W full-bridge smps for an audio amp- hard-switched at 100kHz. If I drive the FET gates full on as fast as I can, I get this large voltage ringing on the output secondary diodes that comes close, if not exceeding, the voltage rating(600V) of the (...)
Old analog multimeter is designed to measure 'sinusoidal' waveform. You should try to get a digital multimeter and make sure that the digital multimeter measures the RMS value current or voltage. Usually you will find the "True RMS" label on top of the multimeter or in the datasheet of the multimeter if it's capable of measuring TRUE
According to me the laptop power supply should have the following features: 1. Universal input: 80VAC to 270VAC 2. Power factor correction 3. No mains transformer to step down the voltage. 4. PWM for o/p voltage regulation 5. HF transformer for isolation. This may seem a lot but take a look at: UCC28512 from Texas instruments and you will
An IC which is common is UC3842. The startup sequence for this (and for some other circuits powered from mains) is made with a power resistor, around 68kohm/2-3W which insert few miliamps in the circuit, from the DC high voltage. There is also a small capacitor after the resistor (around 47uF/25V). If the capacitor is dried, which can happen very o
Perhaps you are referring to line regulation and load regulation. In that case, line regulation refers to the percentage change in output voltage for changes in input voltage, at a constant load. Load regulation refers to the percentage change in output voltage for changes in load current, the input voltage being (...)
Goto this site: There you will find: SWITCHING POWER SUPPLY (smps) DESIGN BASICS voltage REGULATOR TOPOLOGIES, SCHEMATICS, CIRCUITS, GUIDES, AND OTHER RESOURCES ON THE WEB Added after 11 minutes: If you don't have the LT1374 data sheet you can download it from here
On this schematic the input is shown as a DC .. Using this concept you will have to have a step-down transformer which will operate with both 120 and 230 voltages .. and the voltage has to be rectified with a smoothing cap .. Can I have some questions: Do you really need stabilized voltage to supply your amplifier? Can you accept a (...)
x'cuse me, I have questions about transistor configuration, 1. if we want to for example create a common emitter with BC547, of course we need Vcc, beta value, and Icq, am I right or wrong? please correct me if i does any mistakes, okay, the question is, how can i know the value of Icq ? if the beta, we've already known it from the databook of B
you can use muti-phase clock to generate the output voltage
Thr output smoothing capacitor is a reserve of charge. It supplies the load while the switcher output is below the required voltage. The shorter these times are (ie. the higher the frequency) the shorter the time that the capacitor needs to supply the load, hence it does not need to hold as much charge and can be a smaller value. FoxyRick.
In smps design of attachment file, I found that Overvoltage and Overcurrent are sensed from secondary of Flyback trasformer.Overload current sensing is from primary.I would like to know some questions about the circuit like this above. 1.Can current and voltage sensing circuit be connected to either side of transformer? 2.More explanation (...)
The best circuit for this job would be a full-bridge, taking into account the power level. The control loop (or loops, one for voltage, one for current) can be implemented similar to linear power supplies. You can PM me for details. I would like to emphasize though that I do not recommend you undertake such a project, unless you hav
You can use a current probe in series with one of the input leads. Normally, the voltage is applied from a controlled power source, so as to adjust the phase angle. Measure the peak current using this setup. To limit the inrush current, you can use thermistors in series with one of the input leads (check out the AVX website, they make inrush-l
I assume the ripple from the image is with the load connected. First, make sure the trnsformer is not saturated. Check this by measuring the current in the primary winding. I am not familiar with this IC, but if you have a low value resistor (<0,5 ohm) between the swiching element and the primary ground, you may check the voltage across it. It shou
Current Mode vs. voltage Mode,Which mode is better? It depends on ur system application. u may visit National,Ti and Onsemi website and will find many application note.
If load change,assume EA output is constant,how to change pulse width to implement PWM function?,so out voltage cann't be stable.
using internal supply for error amplifer and other compents would be a good approach as battery voltage can vary a lot .
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
Are you using your own transformer construction? You may have too much leakage inductance (you can measure it) causing a destructive spike when turning off, on the Vdrain of the chip. I will start by measuring the Vdrain voltage with a good scope. Sounds like voltage punch-through to me. Layout with any smps is critical. You don't want (...)
I am not going to go into a lengthy analysis, but just explain the basic operation. Once you see this you will be able to work out the details. When the AC is low (up to 120VAC) , Q1 is fired and the diode arrangement works as a voltage doubler. If the AC voltage is high (220VAC), Q3 will prevent Q1 from turning on and you will have normal full
I need to design a smps module with this requirements: Vout : 1V - 60V Iout: 2A voltage must be isolated - Viso =1 KV The supply voltage is not specified at this time. At the end i will use 5 smps - modules to get 5 independent adjustable voltage in a range fom 1V to 60V. generally for (...)
It is a small-signal transfer function from the converter input voltage to the converter output voltage. It is a measure of how noise at the input voltage line is attenuated by the converter by the time it reaches the output. The word audio in audiosusceptability comes from the fact that range of noise frequencies that were considered were
Are you talking about cross regulation? That is when for example, +5V and +12V are outputs of a secondary side of a transformer. So the regulation of one voltage effects the regulation of the other. Are you talking about loading or regulation? This is where a 5V output in a linear regulator with 12V input is effected by how much current i
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?
What is the Input voltage that have to be converted to 12V ? There are many cheap and ready made smps adapters , did you searched for them ? IF you just need a regulator i.e. to regulate 14V to 12V you can use National's LM2567 whose efficieny would go up to 96% . Farshid
It is possible your circuit oscillates. That produces some components in the audible range. I would check with a scope the drain voltage. If you see excessive jitter, it might be a sign of oscillation. Change the time base of the scope to the ms range and see if the top of the waveform seems "modulated" at some audible frequency. That will tell
dear friends i want to design a small smps power supply with specification 12 volts and -12 volts and current rating of 0.5 amperes. please help me out how to go through it. i have no idea at all of smps. the circuit sgould be small and cheapest . Added after 28 minutes: also the input voltage is 220vaC
If the rail voltage is higher than the one you adjusted on the error amplifier then it 's possible that it will do nothing unil the voltage goes down and then, of course, it takes over .. Try to slightly lower it's output voltage .. Regards, IanP
Anyone has the example of designing the 'controller' for buck converter? The controller I mean here is, e.g. how the feedback loop adjust the pwm to regulate the voltage at various loads?
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
Yes the chopper is the high voltage switching part of the smps.
Friends I came across a high power smps for battery charger application in a UPS recently which does not contain the heavy filter capacitors, instead has a good line filter with a series choke and a small capacitor of 1?F 275VDC value. The output is 110v @ 15Amps. The controller used is UC3843 with a unconventional feedback circuit which controls
smps have only 4 different voltages +/-5v and +/-12V if you want to get +3.3V use LM317 with proper resistor to produce 3.3v and input as 12V for 15V use 7815 with input to +12V and gnd to -12V for -15V use 7915 with input as -12V and gnd to +12V Bibin John
very nice handy psu design for me i need this for a protable pc i have has no psu unit there so thanks.... also need variable voltage added say 9 - 19v as a range... i note a problem with pc's psu's like a car it stays hot for five to ten mins after shutdown where damage can occur a car runs the cooler for a while then stops so..