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Recent content by thannara123

  1. thannara123

    Differential amplifier scaled to operate with -230 volts AC to feed a microcontroller works as expected in LTspice simulation. However, the gain is no

    sorry sir circuit will be post soon So I need a buffer to give a constant voltage refferance volt ? in web i have seen ,most of using opamp based buffer.
  2. thannara123

    Differential amplifier scaled to operate with -230 volts AC to feed a microcontroller works as expected in LTspice simulation. However, the gain is no

    @ KlausST sir :I recommend to replace R8 with two resistors of twice the R8 value: One connected to GND, the other connected to 3.3V I wil do and post the result thankyou . 1713504044 sir what is the necessity of this type spliting circuit ?
  3. thannara123

    Differential amplifier scaled to operate with -230 volts AC to feed a microcontroller works as expected in LTspice simulation. However, the gain is no

    Changed the R8 with same as R7 . Power supply changed to 3.3v ,Added a filter capacitor . in real circuit a i already added power supply capacitor . @ KlausST ** you need to test your simulation for both extremes of input range: Do a test with the lower end of V2 connected with GND. And also...
  4. thannara123

    Differential amplifier scaled to operate with -230 volts AC to feed a microcontroller works as expected in LTspice simulation. However, the gain is no

    Hi experts , see the image 0 to 260 volts AC at 50 Hz is supplied to a resistor network, as shown in the circuit above. The op-amp and series resistor are used to scale down the voltage for sensing by a microcontroller.. An offset dc voltage 1.65 volt is given to the inverting input to shift...
  5. thannara123

    [General] Feedback controlling method understand

    sir the signal is taken from the output of the transformer -> stepdown transformer-> opamp + shifting DC bias-> filter -> ADC so we get the sinewave I meant that "the instatanious value" the feedback signal which is properly shifted and connected to the ADC of the controller That means not...
  6. thannara123

    [General] Feedback controlling method understand

    another way of thinking is to comparing the instantaneous value obtained from an ADC read with the corresponding sine value from your sine table is it fast and good way >? we get a real time correction ?
  7. thannara123

    [General] Feedback controlling method understand

    In sinewave inverter like products ,How the feedback control Works ? (transformer Based ) The feedback sinewave signal properly shaped and connected to the ADC of the controller . Is the ADC reads, the first Half cyle and calculate the RMS of the signal . Then correct the PWM switching to...
  8. thannara123

    Confused in Choosing MCU having higher sampling rate!!

    According to the datasheet of each controller , You have to know what is the sampling time of your controller (see data sheet ) Also deponds the ADC clock cycles For example Tconv = Sampling time + 12.5 cycles Example: With an ADCCLK = 14 MHz and a sampling time of 1.5 cycles: Tconv = 1.5...
  9. thannara123

    Logic or sample code to detect the zero crossing Also how detect the positive or negative cycles

    Sir ,i didn't deleted any post . Is there any option to delete the post which have published ? I am wondering sir
  10. thannara123

    Logic or sample code to detect the zero crossing Also how detect the positive or negative cycles

    Sorry sir I am not able to understand what it is , I am hardly trying to understand it ?
  11. thannara123

    Logic or sample code to detect the zero crossing Also how detect the positive or negative cycles

    Thanks for the replays , I want to know, can i use a PLL for for my signal which issaved in the array after detecting the Zero crossing . ie, firstly readtheadc samples for thechalf cycles after detecting the zero crossing the AD_DMA will restart ,It will store the data from zero th...
  12. thannara123

    Logic or sample code to detect the zero crossing Also how detect the positive or negative cycles

    Sir How to impliment PLL in this case may get more details ? Thanks . I am planning to save the data to the memory by using DMA .After detecting zero crossing detection the DMA will restart to save from the base level , but is consume time ? I dont require the detection through Hardware...
  13. thannara123

    Logic or sample code to detect the zero crossing Also how detect the positive or negative cycles

    Thankyou very much sir , As I understood correctly I have a code as follows // Define states typedef enum { POSITIVE, NEGATIVE } State; // Define half cycles typedef enum { NONE, POSITIVE_HALF_CYCLE, NEGATIVE_HALF_CYCLE } HalfCycle; void detectZeroCrossingsAndHalfCycle(int...
  14. thannara123

    Logic or sample code to detect the zero crossing Also how detect the positive or negative cycles

    No sir can you tell me How and how can it avoid ?
  15. thannara123

    Logic or sample code to detect the zero crossing Also how detect the positive or negative cycles

    Sir I am trying to detect it in Digitally , (software level ) 1703143150 I just plan the logic to code See , Any body correct / advice me if i am wrong . I dont have coding expirence well ADC Conversion Complete Callback: This function is triggered when the ADC completes a conversion. It...
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