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SFH6186 - can someone explain me

Discussion in 'General Electronics Discussion' started by raoul, Sep 7, 2015.

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  1. raoul

    raoul

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    Sep 7, 2015
    Have a board with such component. Can someone explain me what it is used for (opto coupler in wikipedia does not help)

    I have Leg 4 connected via some resistors to BSL transmit line (pin 53) of a MSP430f425, need some clues
     
  2. Arouse1973

    Arouse1973 Adam

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    1,081
    Dec 18, 2013
    Well the fact its an optocoupler/ isolator, then I guess you are corect. To know what its doing in a circuit we would need a circuit diagram or more info on the circuit.
    Adam
     
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  3. davenn

    davenn Moderator

    13,671
    1,892
    Sep 5, 2009
    Opto-couplers are commonly used to isolate one part of a circuit from another but still pass a
    control signal between those two parts.
    Often would be between a high voltage and low voltage sections of circuits.
     
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  4. jayanthd

    jayanthd

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    Jul 4, 2015
    What is written on it ? EL817 or PC817 ? Then they are opto couplers.
     
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  5. raoul

    raoul

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    Sep 7, 2015
     

    Attached Files:

  6. raoul

    raoul

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    Sep 7, 2015
    have no schematic, traced some tracks
     

    Attached Files:

  7. jayanthd

    jayanthd

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    Jul 4, 2015
    http://www.datasheetcatalog.com/datasheets_pdf/S/F/H/6/SFH6186.shtml

    They are optocouplers from Vishay and Infenion. There might be other manufacturers also. There will be one resistor at the input side of the optocoupler to drop the voltage from MSP430 so that the IR diode inside the optocoupler gets the required forward voltage and it also limits the forward current of the diode inside the optocoupler. The output side will have a collector resistor and one pin of output side will be grounded and another pin which has resistor will be connected to base of another transistor which drives relay. Or it might be used as an ZCD (Zero cross detector) for a TRIAC dimmer circuit. You will get better answer if you post the circuit or PCB layout.
     
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  8. jayanthd

    jayanthd

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    Jul 4, 2015
    Post the image of the other side of the PCB. I guess the blue big component is a MOV. I also guess that there is a microcontroller and may be an internal or external RTC because I see a 32.768KHz quartz crystal.

    What is that white 6 pin device ? Is it MOC3021 ? The part number is not clear. Post a high resolution image of both sides of the PCB.

    I can see 4 resistors but there are also 4 more components pads next to it but the components are at back side of PCB. Are they diodes ?

    The white 6 pin component is a fairchiald component. Post hi res image. maybe it is a OptoTriac.

    What does the circuit do ?
     
    Last edited: Sep 8, 2015
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  9. raoul

    raoul

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    Sep 7, 2015
    white 6 pin is also optocoupler h11g1 fairchild. Its a digital utility meter.
     

    Attached Files:

  10. jayanthd

    jayanthd

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    Jul 4, 2015
    Digital Utility Meter ? Hmm What does it do ? How is it powered ? What input(s) it take and what output it gives ?
     
  11. jayanthd

    jayanthd

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    Jul 4, 2015
    Is it a Energy meter which shows how much power you consumed per month ? We call it energy meters here. We haven't heard something like Utility meter.
     
  12. raoul

    raoul

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    Sep 7, 2015
    it measures Kwh usage. Connect to 220volt.
     
  13. jayanthd

    jayanthd

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    Jul 4, 2015
    Maybe it is used for ZCD or I have seen energy (KWh) meters which gives pulse output which can be counted and converted to units of power consumed. You have to check which pin (pin no.) of optoisolator is connected to MSP430 MCU. I want to know whether opto's input circuit connects to MSP430 or opto's output connects to MSP430 to guess the working of the opto.

    Edit

    As I said there are energy meters which take pulse input and convert this to power consumed. My be opto is used for that purpose to feed pulses to MSP430.

    May be it is used as ZCD to detect Voltage and Current ZC and then start a ADC conversion to detect peak voltage and current and calculate AC mains power.

    Maybe it is used as a ZCD to detect ZC of AC mains voltage and current and then calculate the angle difference between voltage and current and then calculate power factor if there are no harmonics triggering the ZCD.

    There might be other possibilities also.
     
    Last edited: Sep 8, 2015
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