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Question regarding design

Discussion in 'Electronic Design' started by LM, May 12, 2006.

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  1. LM

    LM Guest


    I wanted to do a protocol check before posting to make sure I am in
    the correct forum. To summarize, I have a schematic with no component
    values that I am trying to reverse engineer. I would like to work out
    the values on my own, but I have questions. Is it appropriate to post
    a schematic (and if so what format is preferred) and ask questions or
    should I create a web page and point to it?

    Also, my questions will probably seem elementary to most. I haven't
    dealt with analog circuits in a long time, but am reviewing my old

    Thank you!

  2. Jim Thompson

    Jim Thompson Guest

    Post a reference URL to the schematic or post the schematic itself


    (s.e.d is NOT binary)

    ...Jim Thompson
  3. LM

    LM Guest

    Thank you, Jim. I have posted the schematic and details here:

    If anyone can help me with this, I would greatly appreciate it.
  4. Jim Thompson

    Jim Thompson Guest

    Looks to be just your ordinary everyday alternator regulator.

    _Perhaps_ reading my patents (on my website) would give you some
    insight into alternator regulators.

    ...Jim Thompson
  5. Fred Bloggs

    Fred Bloggs Guest

    This is a voltage and current regulator. The TR3/4 Darlington controls
    the regulation by adjusting current through the field coil. R5 drives
    the Darlington base circuit and TR1/2 in parallel shunt more or less R5
    current around the Darlington to maintain regulation. TR1 senses battery
    voltage and TR2 senses alternator coil voltage magnitude thus
    controlling charge current. The R4/C2 and R6/C3 are negative feedback
    compensators for TR1/TR2 operating in their linear regions that roll-off
    the high frequency gain resulting from the field coil inductance. Both
    control loops are averaged: the battery averages TR1 input, and the
    field coil averages the current control of alternator magnitude through
    TR2. DZ1 determines the setpoint for battery voltage regulation and
    similarly DZ2 controls the alternator coil magnitude setpoint. You will
    have to know the alternator characteristics for specific component values.
  6. LM

    LM Guest

    Fred, you ARE the man. Thank you. That's everything I was looking
    for in a nutshell. The alternator characteristics are, for general

    Output: 200W, 20A, 3-Phase
    Rotor: Measures 5 Ohms resistance

    That's what the documentation states. I'm not working with an actual
    alternator here, just a schematic and the above test information. It
    states that there would be three wires coming off the stator and that
    between them you should measure 50Vac. It also states that the rotor
    should ohm out to ~ 5 Ohms. Playing around in Tina Pro, I substituted
    an inductor with a resistance of 5 Ohms and an inductance of 50
    Henries (figuring average turns around a two inch "spool", 18 ga wire,
    etc.). It isn't exact, but simulation rarely is.

    Again, I am just trying to refresh and relearn old information. I
    have worked so long with digital circuitry, I have forgotten pretty
    much everything I learned about analog circuits. I graduated over 16
    years ago, so it's been a while. I can't stand to think I have failed
    to retain something I happened to work my tail off learning!

  7. Michael

    Michael Guest

    LM wrote:
    Not to worry. Before long you'll forget to think about what you learned and
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