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Recent content by roiberts

  1. R

    Working at 1500V

    Hi Mr Thaiung Thanks for reply. So each transistor can have a max VCE less than 1000V ? It seems yes.. Correct ? Roberto
  2. R

    Working at 1500V

    Thanks very much to everyone reply to my question. We will work under 1500V, and so using optomos that can stand 1500V. it seems the fast way to do it Thanks again Roberto
  3. R

    Working at 1500V

    Thnaks not so clear how you drive the H Side. Roberto
  4. R

    Working at 1500V

    Thanks Stenzer, Fvm and Easy for reply. As Stenzer saym the zero current is max 10uA, that correspond to 1500/10uA= 150Mohm when mos is open, and, this is trascurable when parallel with a R isolation to measure.. I will be more clear about how we will do the measure (in...
  5. R

    Working at 1500V

    Thanks FVM and Stenzer. I will try and will update about owr final result. Thanks Roberto
  6. R

    Working at 1500V

    For find 2 resitor, that means, 2 incognit, you need a partition.and create 2 equation, as i mentioned last message. If we need to go in detail, i can give more info how to measure isolation, but this means write some equation.,and a question about MOS became a math post. But I can do..no...
  7. R

    Working at 1500V

    Thanks for reply NO secret..excuse..I belive was not so important for the reply. Owr client working in medical instruments, want a test circuit for measure isolation beetwen the 2 PCB part of this product,with the scope to be sure the final user dont remain injured. Measure consist in...
  8. R

    Working at 1500V

    Thanks for Reply Mr Klaus in Attach is the circuit we want create, for 1500V DC voltage. The NMOS I find ( SCT2H12NY) support VCEO 1700V,.and it is OK. The PMOS side I cant find ......Also searching for PNP give not result. Only solution is via IGBT (IXGT10N170 ) ,stans also 1700V I would...
  9. R

    Working at 1500V

    Dear Forum i have a voltage divider ,supplyed with 800V, formed by 2 resistor R1 R2 of 1Mohm each one (in realty i connect more in serie for divide the power) ,so the current is some mA . Because I need to open and close current flow,as switch I use a N-MOS in the lower side of partition...
  10. R

    How dimension a Resistor

    Thanks for reply Could be intresting to know what influence have a overpower of tot second on the life of a resistor... What calculation or data can i use for get a idea of this effect…. Thanks again Roberto
  11. R

    How dimension a Resistor

    Dear Forum In my design, a resistor need to dissipate 100mW ,so,normally i diemnsion it for 1/4w Now,i have this dilemma: 2 test signal ,of not ordinary value , nust be considered. : Test 1 signal create a 0.5w for 60second on my resistor Test 2 signal create a 1.5w for 5 second on my...
  12. R

    Asynchronous Motor Control

    Thanks very much for your reply. Seems that datasheet information about encoder dont correspond to what we measured. Again Thanks Roberto
  13. R

    Asynchronous Motor Control

    Thanks Klaus for reply Please refer to the attach image. We call this configuration -Open Loop- We set in owr software: Vd=0 Vq=0.1 (for example ) The rotor just move a bit (encoder also so theta also), and stop it. If i change Vq (example 0.15 or 0.2 ), the rotor dont change...
  14. R

    Asynchronous Motor Control

    Thanks for reply I again dont understand. If I use only the blocks from PART to motor + encoder in park ,i have 2 input variable: Vd and Vq. In my test, if I change Vq, the theta change only some degree, then it stop. Changing Vq, dont influence theta. It is correct ,or my design have a...
  15. R

    Asynchronous Motor Control

    Dear Forum we have a asincronous motor connect to a SWPWM ,and with a encoder that read the angle. The motor is in a closed loop, controlling the speed; the loop is the tipical composition i find in lecterature named I.F.O.C..Schematic is in the figure I upload. All math and block are...
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