So, can you please tell me the inductance. So finally i need 2 clarifications High Frequency DC is suitable for Inductive loads or not & Formula for inductance. Thanks in advance. Regards, Anvaya Designs. You can build pretty high power systems with it.

Thank you for that lead. As an operations question, a 3525 block diagram shows 3 inputs to the PWM.

Hy Tahmid,i hope you will be fine. I am having a problem in making inverter.i'm making inverter using tl494 and sg3524.i'm using push pull topology to drive transformer and tl494 to drive push pull mosfet and sg3524 to drive full bridge mosfet.but there is no feedback.its just a simple circuit.can you send me the tl494 and sg3524 circuit with proper feedback.i have shared the only tl494 circuit file.link is my email is dowson.jack17@yahoo.com. Oga tahmid i greet oo. Ive tried this ferrite stuff mainly for Inverter application, but the moment i add load on it the heat my mosfets generates is enough to boil a bucket of water.

The output of the transformer is rectified with ultrafast rectifier 31DF6 and capacitor is used to filter to pure DC. The output voltage is kept regulated using a zener-optocoupler based voltage feedback loop. NTC has been used at the input side to limit inrush current due to charging of the capacitor at the primary side.

SMPS float capacitor question Page 1 of. Which gives me about 24 volts DC that I feed into the sg3525 and ir2110.

The 7812 regulated supply is a quite independent and isolated 12V supply that is only needed to power the SMPS chips on the –170V rail of the rectified AC. It is needed to power the SMPS chips before the switching supply can start.

Ihave a problem with a modified sine wave inverter i built. Its running at 60hz on the output when ever i plug appliances in it like tv radio fridge lights etc the frequency at the output remains at 60hz but when i plug a fan into it I see my meter showing frequency change like 158hz and it is not stable if I use one leg of my meter and touch one leg of the ac out it reads 60hz but accross two legs I see an increase but this only happens with a fan pluged in. Please help me here. I can't give you any complete circuit, but go through these: Hope this helps!

This SMPS is capable of delivering 864W of power when ETD59 core is used. The primary is 26 turns and secondary is 4 turns X2. I have regulated 12 volts for SG3525 and IR2110 supply. SMPS circuit have 3 version of the 700w (+-50v 50khz), 800w (+-42v 60khz) and 900w (+-70v 50khz) circuit diagrams for the same smps pwm control output is used to drive the integrated MOSFET sg3525 ir2110, but according to some of the values are different, the forces of the output of the SMPS circuit voltajlarına has been prepared with proteus. Dec 02, 2015  So I have two identical half bridge smps, each uses two mosfets and one IR2110 which drives the mosftets, both IR2110 are powered from a single small transformer and rectifier/voltage regulator. Both IR2110 are driven from an.

But I think I've read that Bubba oscillators are unstable and take quite an effort to get stable. For commercial applications with high efficiency, I think your best choice is to use microcontrollers. Go to this page: Scroll down to 'SPWM and sine wave generation and inverter:' and see all the related articles.

Those who want to make a smps with two or more output voltages must do the winding of main transformer very precise and evenly. It is so important to take your time for a precise, clean and neat winding and never wind two rails together. I'll install the heat sink and put it under load for the final testing and will definitely report the results. I finally got the correct and precise voltages out of my SMPS. Thank you guys for helping me. My mistake was the way I had wound the main transformer.

You can refer to the following standard design in which it shows pin#9 attached with pin#1. In this the PWM could be effectively adjusted simply by adjusting the voltage at pin#2.

This pin out should not be kept unconnected for avoiding stray signal pick ups. Pin#11 and #14 (output A and output B): These are the two outputs of the IC which operate in a totem pole configuration or simply in a flip flop or push pull manner. External devices which are intended for controlling the converter transformers are integrated with these pin outs for implementing the final operations. Pin#12 (ground): It's the ground pin of the IV or the Vss. Pin#13 (Vcc): The output to A and B are switched via the supply applied to pin#13.

SG3525 is a voltage mode controller, which is right for the half-bridge topology, but typically requires type III compensation which you don't have. SG5325 and IR2110 do make a good combination for an offline regulated half bridge, you don't need to use a 'dedicated half bridge driver' as DjLeco said. The optocoupler complicates this as it introduces an extra pole. Bias it with a relatively high optotransistor current to increase the frequency of this pole out of the way (above the loop crossover frequency). If I were doing this, I'd use a secondary side TL431 as the error amplifier with its own linearly regulated aux supply so that I could put the type III compensation network there, tie the SG3525's internal opamp so that its output is in cutoff and input the feedback directly to the comp pin. If you do this, I think you want the optocoupler output to be common-collector.

The end-taps on the secondary are supposed to swing in opposite polarities in reference to the grounded center tap. This could be causing the HISS and abnormal output voltage due to core saturation. The dual secondary winding are in series. Just like showed in the attached picture. I finally got the correct and precise voltages out of my SMPS. Thank you guys for helping me. My mistake was the way I had wound the main transformer.

Pin 13 is VC – the supply voltage to the SG3525 driver stage. It is connected to the collectors of the NPN transistors in the output totem-pole stage. Hence the name VC. VC must lie within the range 4.5V to 35V. The output drive voltage will be one transistor voltage drop below VC.

Also the transformer makes an unpleasant noise. What would you suggest me to do? Maybe zenner diodes put reverted? I checked every single part one by one, four or five times. Every thing was correct.

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Since the efficiency was crap with a first test (I used the 1N4007 for the bridge rectifier), maybe the output capacitor of 470uF 450V is to big, they were also getting hot. I swaped the diodes for Buy27. So now I got 209V 0.63A output @ 75% efficiency and 208V 0.17A @ 74% efficiency. No load (only about 1W for the voltage sensing feedback resistors ) the circuit draws about 2.2W.

Since average current is low, voltage difference between 7812 input and output is not too great, the power dissipated by the 7812 is not too high and no heat sink is required. The output of the ETD39-based transformer is rectified with schottky rectifier STPS3045 and an LC filter is used to filter to pure DC. The output voltage is kept regulated using a zener-optocoupler based voltage feedback loop.

The output of the transformer is converted to DC. The high-voltage DC is kept regulated by the SG3525 using direct resistive voltage-divider based feedback. This high-voltage DC is then converted to 50Hz AC using 4 MOSFETs (IRF840) in full-bridge configuration. The quasi-sine signal is generated by the 16F676. The output signals are fed into 2 IR2113 high-low side drivers that drive the MOSFET full-bridge. The 16F676 also monitors the battery voltage for low-voltage cut-out. It also monitors the load current for overload protection.

Try swapping inductor connection sorry i can not upload a picture now,maybe tomorrow. I was thinking if the voltage difference between two rails is derived from the unsymmetrical transformer winding, so reversing its output would reverse the voltages and i'll have +36 and -26 volts. I did this but nothing changed. I still have -36 and +26. Another thing I did was monitoring the negative rail instead of positive one. So I connected the optoisolator to negative rail.

But this concept is work practically. This is just a academic project. We are the manufacturing Company.

Offline Half-bridge converter Input: 160 to 240V AC 50/60Hz Output: 14.5v 10A (max) Final test circuit (on PCB) for battery charging. To be incorporated in SMPS inverter with charger. The primary side PWM is controlled by SG3525 PWM chip. Frequency of operation is around 50kHz. The output signals of the SG3525 are fed into a IR2110 high-low side driver which drives the 2 MOSFETs (IRF840) configured for half-bridge topology. ETD39 core is used for the transformer.

I am happy to hear good news from you. Hi KX36 maybe my simulation is not good enough, i just want to show that one way to overcome the noise(vibration) of the transformer is by eliminating pulse skipping I've never been able to successfully use an internal error amplifier (SG3525 or TL494) without causing pulse skipping, I need to learn more You need to be careful with terminology here.

I've confused myself thinking about this, but if I'm understanding your winding configuration properly, your center tap is grounded as it should be. When the primary current swings positive, both secondary end-taps are going positive, then when the primary swings negative, both secondary taps are swinging negative. The end-taps on the secondary are supposed to swing in opposite polarities in reference to the grounded center tap. This could be causing the HISS and abnormal output voltage due to core saturation. Correct me if I'm wrong here, but the way you say that you wound your secondary, it seems to me that the two secondary windings are in parallel instead of in series. I've confused myself thinking about this, but if I'm understanding your winding configuration properly, your center tap is grounded as it should be. When the primary current swings positive, both secondary end-taps are going positive, then when the primary swings negative, both secondary taps are swinging negative.

I finally got the correct and precise voltages out of my SMPS. Thank you guys for helping me. My mistake was the way I had wound the main transformer. Thanks to the res_smps guides I rewound it in the correct manner. Those who want to make a smps with two or more output voltages must do the winding of main transformer very precise and evenly. It is so important to take your time for a precise, clean and neat winding and never wind two rails together. I'll install the heat sink and put it under load for the final testing and will definitely report the results.

So, I recalculated the transformer design and did a new winding. It's a 50Khz half bridge smps with the 300 volts of input voltage. The Rds(on) of IXFH32N50 is.16 ohm.

Thank you guys. Your answers were so informative. Last night before changing the feedback circuitry, I noticed that the output coils were 47uH instead of 20! So I replaced them and output voltage came up.

It should Work with inductive loads. And more over the above design (SG3525) is useful for Inductive designs. With High frequency DC Voltages. In you have mentioned that only number of turns. But we cant able to construct Ferrite Transformer without knowing inductance.

Thanks in advance for taking the time to read this. Have a great day1 mjd. I am Syed Tahmid Mahbub, from Dhaka, Bangladesh, born on August 1, 1994. Electronics is my passion and from class V, I have been learning electronics. I learnt and worked mostly on SMPS, power electronics, microcontrollers and integration of microcontrollers with SMPS and power electronics.

Then work on the feedback. The error amp in the SG3525 is not a transconductance amp, its your average everyday simple voltage feedback opamp and so it is compensated with an RC network from the comp pin to the inverting input, not to ground. What you're doing there is putting a heavy capacitive load on an open loop opamp so it's no wonder it doesn't work.