What does this circuit do?

Discussion in 'The Projects Forum' started by Engjay, Mar 7, 2008.

  1. Engjay

    Thread Starter Member

    Mar 7, 2008
    14
    0
    hi Guys
    can anybody figure out what does this circuit do ?
    i toke it from a tradmill near the dc motor
    i want to know where the dc part is in this circuit
    i need the schematic form for this circuit
    i will attach the picture hope it can help
    if u know any circuit that is similar to it
    the names of the 6 chips
    1-mospec u16c60c
    2-kia 7805pi
    3-cd 40106be h9605
    4-ixys dsei 30-06A
    5-st mrc tyn690
    6-s21md3v sharp
    thanks
     
  2. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
    5,687
    900
    Given its location, I suspect it is a PWM controller for the DC drive onthe treadmill. If you look up each of the parts, you will probably get a better idea. Your #2 is a voltage reguator for the logic, the CD40106 is a hex Schmitt trigger from which the PWM signal is probably generated. John
     
  3. Engjay

    Thread Starter Member

    Mar 7, 2008
    14
    0
    this circuit attached to a dc motor
    our project is that we need to use battry without an ac input so we want to figure out how can we put the dc part so this circuit willl work
    we want to remove the ac part
    thats why we need the schematic for it
    i dunno how to draw it
    can you help me pleeez
     
  4. Engjay

    Thread Starter Member

    Mar 7, 2008
    14
    0
    The Picture From Two Side Up And Down They R The Same
     
  5. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
    5,687
    900
    Go here: http://www.alldatasheet.com/

    Look up each of the components. I see at least 10 components, 5 on the back and 5 on the front. There is also a set of diodes on the board. One or more is probably a rectifier (maybe an SCR). Find that/those component(s) on the board and determine which lead is positive DC. There are tabs marked AC on the board. Are they at main's voltage (110 or 220V) or are they supplied from a transformer? I will assume they are main's voltage.

    You say you want to use a battery. Some treadmills work at higher voltage than the usual 12V. Be sure to determine what voltage yours works at. The fact that there is no transformer on the board, and it is running a fairly powerful motor (As I recall, treadmill motors are around 1 HP) leads me to think the treadmill motor works on higher voltage DC.

    The board also probably receives a DC logic-level supply through one of the plugs, as dropping from the rectified mains DC to logic with the 7805 is not going to work. You need to locate that other
    circuit. Do you have a voltmeter? John
     
  6. studiot

    AAC Fanatic!

    Nov 9, 2007
    5,005
    513
    There is only one way.

    Identify each component and its leads
    Draw a block circuit diagram showing blocks for each component and connection stubs for the leads
    Hold the board up to a strong light so you can see through it and
    On your diagram draw the connections made by the tracks.

    Redraw your diagram to bring out the circuit functions more clearly.

    The board is one sided and there only seem to be macro sized components, so it should not be too difficult.

    I would allocate 2/3 hours for the job.
     
  7. Engjay

    Thread Starter Member

    Mar 7, 2008
    14
    0
    there is an external transformer from 220 to 110
    we want to draw a circuit diagram for it
    now i need to ask you
    but if we neglect the AC part will it work perfectly
    i mean does these stuff have some kind of a safety mechanism
    we need your opinion we want this motor to work from a 12V battery
    using a boost converter to 180V
    or by inverting the 12V to AC around 220 and use it to power the whole system
    which one is better
    most of us are disagreeing on the 2nd idea so what do you think
    this is the diagram of how the system works and the info about the parts of the board
     
  8. Engjay

    Thread Starter Member

    Mar 7, 2008
    14
    0
    only if we configure that where is the ac part start and end and change to dc we can neglect it so we can make of use for this controller
    thats why we need the schematic for it we tried to search but we have difficult to read the circuit
     
  9. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
    5,687
    900
    Any high-current boost converter from 12 VDC to 180 VDC will probably convert to AC, use a transformer, then convert back to DC. Since the last function is already built into the board you have, why do it twice? Convert the 12 VDC to 110 VAC and feed it to the board. John

    Edit: Do you know the wattage of the motor you are trying to drive?
     
  10. Engjay

    Thread Starter Member

    Mar 7, 2008
    14
    0
    is it better if we use a converter from dc to ac then using this circuit ?
    so we are getting away from the ac part
    but am scared that it will use more power
    this project will be for our electric car
    so we need this treadmill controller for controlling the speed for the car as it do when we using the treadmill we can increase it or we can decrease it
    what do you think ???



    we need it to attach the controller and dc motor for the electric car so we use battery
    with 12 volt
     
  11. Engjay

    Thread Starter Member

    Mar 7, 2008
    14
    0
    1.8 hp
    dc motor
    series 3000
    with maximum volt in to 180 volt
    so we can use a controller to 180 v for accelerating the motor
     
Loading...