Hi, I am building this smps (schematic attached ) I have a question, since it's a half bridge topology the other end of the transformer primary is attached to half the mains rectified (capacitor middle) via a capacitor, but heres the question, the transformer primary is attached via a capacitor to the middle point of the smoothing capacitors which makes now two capacitors in series to ground and to +ve, if im correct that makes the maximum voltage attainable at the primary not half but 1/4 that of the mains rectified correct? Can I just connect the float from the primary directly inbetween the smoothing capacitors without the additional capacitor?

The small transformer is made with a rectifier a smoothing capacitor and a zener which gives me about 24 volts DC that I feed into the sg3525 and ir2110, the maximum allowed for the sg is 35 volts and for the ir2110 25volts. Sg3525 Ir2110 Smps Rar free download programs. 0 Comments Sg3525 Ir2110 Smps Rarest. Author: Topic: Current control for SMPS Arc Welding Machine (Read 19181 times) 0 Members and 1 Guest are viewing this topic. Using the SG3525 PWM Controller - Explanation and Example: Circuit Diagram / Schematic of Push-Pull Converter. 600W 50Hz sine.

My devices are IRFP 460 they handle up to 400v if i remember correctly. Can I just connect the float from the primary directly inbetween the smoothing capacitors without the additional capacitorNo. The series capacitor 1uF/480V is necessary to make sure the current through the primary is balanced and averages zero. If you connected the primary directly to the float terminal, the cap would need to move to the other side of the primary. The capacitor also limits the energy transferred on each cycle of the conversion.

It prevents high DC currents in the transformer primary. The directly rectified mains that is divided up with that capacitor divider can be thought of as a fairly high impedance source at DC but a very very low impedance source at the switching frequency. A fairly clever way of doing it I guess when there is no transformer to use the center tap for this float node. In a perfect world I think the series capacitor in question could be eliminated but I would not do it. Slight differences in tolerances could cause an imbalance in that capacitor divider. The series capacitor will not cause any loss.

It is only responsible for passing AC and at the switching frequency it will not even appear to be there. Also I wanted to ask one more question, see in the attached schematic there is a feedback optoregulator ' 4n25' now it has two zener diodes in series connected to it, I assume the zener voltage is choosen to be such that its about 4 volts below the maximum output of the rectified high frequency AC coming from the transformer?

Also can I use more than two zener diodes in series but each being a different zener voltage? I just need to get some particular voltage but I dont have the correct zeners at hand but I have other ones I could combine hem in series to get the needed one? Firstly, the capacitor. You should stick with a 1uF bipolar capacitor. Reducing the voltage spec might cause a problem when switching the unit on or off. There is a reason why they specified those values. Arun shourie the world of fatwas pdf online. It needs to be a good low loss cap, not electrolytic.

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The ripple current is quite high. Secondly, the chain of zenners. You can make the chain from what you have but check them before you turn it on. The 4 volts is needed to allow for the opto-coupler LED voltage, plus takes into account the difference between zenner knee voltage and at what voltage the zenner will be conducting enough current to turn on the LED in the opto-coupler. For example if I need 80 volts I put 76 volts on the zener series connection and the feedback changes either the duty cycle or frequency? And the output voltage hence changes correct?Yes.