DPDT switch using MOSFETs

Discussion in 'The Projects Forum' started by koretech, Jul 1, 2011.

  1. koretech

    Thread Starter New Member

    Jun 29, 2011
    3
    0
    Hi all,

    I am trying to figure out how to make a DPDT switch using MOSFETs, transistors or whatever you think best.

    I want to use a Hall effect switch to trigger the DPDT.

    So if the first leg of the DPDT is X to A or B and the second leg is Y to C or D:

    I want current to flow from A to X and Y to C. When the Hall switch is activated the current changes to B to X and D to Y. When the Hall switch turns off, it goes back to A to X and Y to C.

    Here is the Hall switch I have:

    Melexis MLX90217

    Here's the datasheet:
    http://www1.futureelectronics.com/doc/MELEXIS/MLX90217LUA-BU.pdf

    Supply Voltage VDD Operating 3.5 - 24 V
    Supply Current IDD VDD = 12V 1.5 3.0 4.5 mA
    Supply Current IDD VDD = 3.5V to 24V 1 - 6 mA

    Any help or reference on how to do this would be greatly appreciated.

    Thanks in advance.

    Best to you.

    Mike
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Basically, you want what is known as an H-bridge.

    The Hall-effect sensor has an open-collector output; it can sink up to 25mA with a saturation voltage of 0.6v/600mV.
    Your datasheet link didn't quite work; here it is again:
    http://www1.futureelectronics.com/doc/MELEXIS/MLX90217LUA-BU.pdf

    What you need to tell us is, what is the voltage and current that you want to be able to switch, and at what kind of speed?

    [eta]
    You might want to describe your project in more detail, as frequently we can come up with a number of additional options for you to consider.
     
  3. koretech

    Thread Starter New Member

    Jun 29, 2011
    3
    0
    HI SgtWookie,

    Yes, I forgot to mention what the switching load would be, thanks.

    The switch current would be no more than 1 amp at 60 volts, less than 60 watts.

    Speed would be no more than 500 cycles per second.

    I'm building a motor controller. I'm pulsing a coil to drive a magnet rotor.

    Thanks for your quick response.

    Mike
     
  4. koretech

    Thread Starter New Member

    Jun 29, 2011
    3
    0
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