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Thread: IR2153 smps with short circuit protection.

  1. #1
    diysmps Senior Member
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    IR2153 smps with short circuit protection.

    Hello today i`m build new smps with ir2153, this schematic and pcb files are from forosdeelectronica and credits go to mniclauo. This smps was up and running but i have little problem when im feed it with high load. smps details, 2 x irf740, ir2153, run freq is 100khz, protection use current sense trafo, 4x 1n4148 + mcr100, output voltage +43.5 and -43.4, output diode mur420 x4, output inductor 25+25 laps awg 18.

    Today im testing this smps with 200wrms discrete class D and solidstate with 8 output transistor (4 x 2SA1302 + 4 x 3281). testing result:

    1. with class D amp play loud at max, mosfet irf540 and 9540 only warm about 38 Celsius with psu heatsink. irf740 remain cool just warm a little, 220v bridge rectifier heat raise, ntc heat raise, main trafo about 45 Celsius , mur420 heat raise, output inductor warm.

    2. with solid state amp play loud at max, 4 x 2sa1302 and 4 x 2sc3281 is hot and need bigger heatsink, best if we place fan with heatsink, when play normal about half volume temp is stable. irf740 remain cool just warm a little, 220v bridge rectifier heat raise, ntc heat raise, main trafo about 45 Celsius , mur420 heat raise, output inductor warm.

    regarding smps output voltage, +vcc drop 40.4 and -vee increase -45.6, there is the problem. for both test class D and with solid state amp will face same problem. This smps have no feedback and its run at 50% duty cycle all the time. from what i read from the net, smps without fb no need output filter because it will hurt output voltage. so i need opinion and suggestion from you all in diysmps and microsim to solve this problem, because i dont face this situation with ir2110 with fb there is no imbalance voltage appear.

    i`ll post some picture, maybe 2-3 hours more becuase now here is about 6:36am, hehehehe early morning and no sunrise yet. i`ll post complete include schematics and pcb like usual .

    best regards,
    Azmi.

  2. #2
    diysmps Senior Member
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    ops forgot the schematics and pcb files, i`ll post my own smps that i`ve build late when sunrise arrive.

    enjoy
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  3. #3
    diysmps Senior Member
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    problem solved , it was inductor. so i make new inductor with 2 t106-26 seperate on each rails, it works ok now, both rails have same voltage drop and raise is together now. I think i need to short ntc with relay and add 4 more output diode with mur420 x 8. also bridge rectifier need to change from 8A to 16A and filter caps from 2 x 330uf to 4 x 330 uf. will make new one will be more bigger than this size and with ETD49 wanna see the power can deliver.

    one thing i notice after change inductor, before this i use 1 toroid t106-26 inductor for each rails wind together at one core, and i`ve got little noise coming out from solid state amp, but no noise with class D amp. After change the inductor there is no noise at all with solid state amp.

  4. #4
    diysmps Senior Member
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    hi nozrami how many watts is the smps with irf 740 and with irfp 460 as outputs? and in your photos i havent seen the over current transformer or is it one of the t106-26

  5. #5
    diysmps Senior Member
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    hi stewin, yes its t106-26, you can use any ferrite torodial core or you can simply take out EE16 core from old psu or EE19 which is suiteable for you, i`ll instruct you for the current sense trafo winding if u want to build it and its easy. the output watts is depend on your primary transformer, the large core u used then more power u will get. estimated irf740 will go 500-600 watts and irfp460 will be more maybe 1kw. to reach this we must use at least etd49 core with multi strand wire awg 22-29. .

    for standard winding i`ve use 12 + 12 for the primary with 6 strand AWG29.
    because this smps is no feedback and always run at 50% duty cycle, the output voltage estimated about 6vdc per turn.
    so if we wound 6 turn with AWG29 ( i use 8 strand) we will have approx +- 36vdc at output.

    for the auxiliary i use AWG24 1 strand 4 laps.
    and for the +- 15vdc supply AWG24 1 strand 4 + 4 laps.

    for the current sense trafo:
    25 turns for each branch. are performed in parallel (both arms at once), a branch between "a" and "c", the other between "c" and "b".

    regards,
    Azmi.

  6. #6
    diysmps Senior Member
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    for the current sense former what is the primary turns and does it shut down the smps in case of a short circuit at the out put voltages ? you haven't include a line filter does a radio work when the smps is on? will irfp 460 work well while switching at 100khz?
    Last edited by stewin; 01-21-2012 at 10:29 PM.

  7. #7
    diysmps Senior Member
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    Primary just 1 turn single cable across the current sense trafo, yea i dont include line filter, you can modify the pcb if u want to put it, because i want make it simple, so far i dont have any interference with radio or tvs, im putting class D amp and smps with small place together in box, both working allright with high freq and no noise so far.

  8. #8
    diysmps Senior Member
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    short circuit work, it will shutdown the ir2153(reset) its not only short circuit i have test today, when play hard i think maybe over the limit it can deliver power it will also shutdown lol

  9. #9
    diysmps Senior Member
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    wow thanks nozrami. i'll give it a try hopefully post pictures.

  10. #10
    diysmps Senior Member
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    be careful while working with high voltage, and i hope u know the safety way to work with smps and any high voltage application. at first power on make sure u used light bulb with 220vac line .

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