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Recent content by raja_rajan

  1. R

    dsPIC33FJ64GS606 uart receive interrupt not working properly

    Hi, Here is uart init code. #define FCY 40000000 #define BAUDRATE 115200 #define BRGVAL ((FCY/BAUDRATE)/4)-1 unsigned short val=0; void uart1_init() { // configure U1MODE U1MODEbits.UARTEN = 0; // Bit15 TX, RX DISABLED, ENABLE at end of func //U1MODEbits.notimplemented; // Bit14...
  2. R

    dsPIC33FJ64GS606 uart receive interrupt not working properly

    Hi, I am using dsPIC33FJ64GS606. UART receive interrupt not working prorperly. while sending data from real term terminal two or three times. i have get a response message or the specified operation are working after sending the data two or three times. Here is the code for uart...
  3. R

    discontinuous flyback transformer switching,100Khz , 8A

    Hi, I am using a feedback resistor divider network to cutoff the charging capacitor to particular volt. If the capacitor has 750 volt through the feedback resistor, I will get 2 to 3v which is given to adc and when the reference value is matched the pwm is off, capacitor stops...
  4. R

    discontinuous flyback transformer switching,100Khz , 8A

    Hi, Please see the link for igbt spec. https://www.infineon.com/dgdl/irg4pc50wpbf.pdf?fileId=5546d462533600a401535647cdad22fb Regards rajarajan
  5. R

    discontinuous flyback transformer switching,100Khz , 8A

    Hi, Do you suggest us a mosfet, which supports 100Khz, 200v and >20A?. Regards, rajarajan
  6. R

    discontinuous flyback transformer switching,100Khz , 8A

    Hi, For snubber circuit, any specific value for capacitor. can i use ordinary diode like 1N4007 ?. I am using 600v,(55A @25c,27A @100C) igbt for 8A flyback transformer. but primary volt is 12, secondary volt is too high upto 3kv. Is it necessary to put a snubber circuit?.
  7. R

    discontinuous flyback transformer switching,100Khz , 8A

    Hi, how to calculate rcd snubber for the circuit.
  8. R

    pointer of function in c

    Hi, Because it is not returning pointer. it is returning an integer. int cmp(const char *, const char*)); int (*p)(const char *, const char*); p=cmp; // it replace as int (cmp)(const char *, const char*);=int cmp (const char *, const char*); if the function is returning...
  9. R

    pointer of function in c

    the called function is returning char * or uint8_t * or the function is returning pointer of uint8_t.
  10. R

    discontinuous flyback transformer switching,100Khz , 8A

    No, according to manufacture details. The transformer will give 2200v for 12v input.but i am getting close to 3000v ac,now i use three diodes to increase reverse voltage protection and getting 1400v across diode. the transformer is designed to charge a 25uf/1100v capacitor upto 1100v in 0.8...
  11. R

    discontinuous flyback transformer switching,100Khz , 8A

    Hi FvM, I had attached schematic. Please see the file and tell me if any thing is wrong in the schematic. Thank you for your response.
  12. R

    discontinuous flyback transformer switching,100Khz , 8A

    hi, I am using discontinuous flyback transformer of current rating of 8A and frequency is 100khz with 60% on and 40% duty cycle. I am using fod3184 optoisolator to drive the igbt which supports upto 150khz. using this transformer, i have to charge 25uf/1100v capacitor upto 950v. while...
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