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Recent content by saeedmns68

  1. S

    EMI filter selection

    I want to get an EMI filter for my half bridge converter.The input voltage of my circuit(AC line supply voltage) is 220V 50HZ and the frequency of current coming from AC supply(load current) is 500KHZ,the cut-off frequencies(common mode and diffrential mode) calculation of an EMI filter is...
  2. S

    The effect of gate emitter capacitance on oscillation in short circuit situation

    Thanks treez I want to know that in the short circuit situation how does this capacitor make the oscillation low??
  3. S

    The effect of gate emitter capacitance on oscillation in short circuit situation

    In the attached document the writer says:"the capacitor between gate and emitter of an IGBT(we put this not the internal gate emitter capacitor) reduces oscillation in the short circuit situation".how can this capacitor do it?how can we calculate the capacitance?
  4. S

    Problem with IR2153 high side output

    I dont undrestand you!!!!!!!!!!
  5. S

    Problem with IR2153 high side output

    What is your meaning?????
  6. S

    Problem in triac circuit

    Your main switch has no effect on your 1st triac and load but it has on others . Are U sure dont turn on other triacs?because when U turn on triac1 and manual switch1 the line voltage from MT2 of triac1 goes to MT2 of triac2 & 3 and only thing that can switch on other loads is turning gate of...
  7. S

    Problem with IR2153 high side output

    Today I changed the polarity of my measurement(mesuring Vge and Veg) the noise got down!!!what is the problem??
  8. S

    Problem with IR2153 high side output

    There is no active probe, my probe has 2.2Mhz safe response output and no battery I used. I interchanged probes but the result is same - - - Updated - - - Today I changed the polarity of my measurement(mesuring Vge and Veg) the noise got down!!!what is the problem??
  9. S

    Problem with IR2153 high side output

    I have two similar appropriate high voltage probes
  10. S

    Problem with IR2153 high side output

    Klaus I measured with one probe only at HO and VS .The VGE voltage peak to peak is 11V .300V is for the power side (Vcc) .I measured VGE of low side with that probe and os and it had no noises
  11. S

    Problem with IR2153 high side output

    I measure by an oscilloscope Im sure oscilloscope is working well.frequency is 14kHZ and each horizental division is 2.5V
  12. S

    Problem with IR2153 high side output

    Im making a half bridge 300v 14khz square wave power supply by using two ultra fast IGBTs and a IR2153 gate driver,when the power part of the circuit is inacvtive(Vcc=0 V) the gate-emitter waveform on high side IGBT is good with peak to peak voltage of VGE=11200mV , but when the power is...
  13. S

    Problem with IR2153 high side output

    Problem with IR2153 high side Im making a half bridge 300v 14khz square wave power supply by using two ultra fast IGBTs and a IR2153 gate driver,when the power part of the circuit is inacvtive(Vcc=0 V) the gate-emitter waveform on high side IGBT is good with peak to peak voltage of VGE=11200mV...
  14. S

    IR2110 Low Channel Problem

    Are U sure to put R4 and R3 resistors?without them IGBTs may turn on with out any control
  15. S

    IGBT module, with IR2110 driver

    I think you would place a bipolar capacitor between VB and HO
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