Audio smps 700w (IR2153)

[yingtso]

Hi again Benny, the high frequency startup is because the IR2153 does not have a soft start. Charging the secondary capacitors at startup present a nearly dead short especially if having more than 2000uf on each of the center tap windings. However starting the trafo with 3 times the frequency cannot deliver that much current as this is wound for a lower frequency. This will reduce the stress on the mosfets and prevent them from burning.
Another way to eliminate this problem can be arranged by putting a 5R resistor on the VS line to limit the current and then this resistor can be bypassed by means of a relay after a couple of seconds after startup. Another idea comes in mind is adding an NTC thermistor on the VS line. However with an NTC you cannot start the smps while the thermistor is still warm as it will have no effect as its resistace would be very low.

Regards Silvio

Hi, Silvio
I'm Benny from the IRS2153 I tested last year
I have now switched back to the IR2153 beta sub
lt is working normally without big problems.
But now this power supply finishes working after the power is turned off
The transformer will produce a noticeable hum that disappears after a few seconds
I think the capacitor or transformer is discharging too slowly?
Have you ever had a similar problem or have any suggestions?

 

[Silvio]

Hi, Silvio
I'm Benny from the IRS2153 I tested last year
I have now switched back to the IR2153 beta sub
lt is working normally without big problems.
But now this power supply finishes working after the power is turned off
The transformer will produce a noticeable hum that disappears after a few seconds
I think the capacitor or transformer is discharging too slowly?
Have you ever had a similar problem or have any suggestions?

Put the volume control to minimum prior to switching off or you can add a mute circuit to the amplifier sensed on the mains supply swich.
You can also add a crowbar circuit formed by a tyristor in series with a resistor to limit current. This will be sensed with the power switch and will activate when the power is switched off hence discharging quickly the secondary voltage.
These are ideas you can adopt. I do not have any circuits for the ideas and these need to be developed by yourself or you can research the internet.
Good luck
Silvio

 

[IVANELECTRIC]

14:01Hs
Hello Silvio! How are you? I have finished the SMPS with the control pcb from the V2.1 pdf file.
I want to know about the construction of the CT, is it 40 double turns or 80 double turns?
I show you some of the toroids that I have, can they be used with iron powder like those of the ATX smps?

I await your response to finish and rehearse, thank you very much!

Edit:
17:43Hs
I tried using a black toroid with 20 double turns of 0.3mm and with 140Vdc between rails I placed a load of 100 ohms. But no matter how much I adjust the current trimpot, my load is always energized.

 

[Silvio]

14:01Hs
Hello Silvio! How are you? I have finished the SMPS with the control pcb from the V2.1 pdf file.
I want to know about the construction of the CT, is it 40 double turns or 80 double turns?
I show you some of the toroids that I have, can they be used with iron powder like those of the ATX smps?

I await your response to finish and rehearse, thank you very much!

Edit:
17:43Hs
I tried using a black toroid with 20 double turns of 0.3mm and with 140Vdc between rails I placed a load of 100 ohms. But no matter how much I adjust the current trimpot, my load is always energized.

Hi, for the current trafo you need to wind 80 double turns. It is best done with 0.15 or 0.2mm copper wire.
You take two lengths of wire and wind them together. Thin wire can be found in relay coil.
Regards Silvio

 

[steppler]

Hello, does the position and distance of the 2153, transistors and transformer have an effect on functionality?

 

[Silvio]

Hello, does the position and distance of the 2153, transistors and transformer have an effect on functionality?

Well in a way yes. The shorther the path with the signal to the mosfet gates the less likely to get false triggering due to induced capacitance and inductace in the traces. Try to keep high current paths away from small signal paths while designing the pcb. It is one reason I use a vertical pin header on the main pcb. This will shoten the path and saves space.

 

[steppler]

I finished IR2153 SMPS. I got inspired here. The SMPS is very powerful and reliable. When the 600W amplifier limiting, the voltage still does not drop. That is very good. But when amplifier limiting, the SMPS makes a strange sound. I can't figure out which part is doing it. I recorded the noise, microphone close to SMPS. Don't know what causes it?
Here is a sample:

Thank you for help.

 

[Silvio]

The noise is coming from the SMPS. When limit cuts in the smps tries to switch off and re- starts again. I don't know what your amplifier is consumig. I suggest that you increase the limit current to get rid of the noise. You must also check if your amplifier is clipping. Working your amp at full blast will not last very long.