I don't know about the windows kinect, but for the normal one it is quite easy.
Just clip the cable that runs from the AC adapter to the Y-connector. There should be two cables inside (brown and white, if I remember correclty). Those should be powered by 12V from your robot.
The best way to ensure that is the case and that the polarity is correct independent on cable colors, I'd suggest measuring the power on the clipped AC cable first.
Also, there is a detailed tutorial that describes this.
Originally posted by dornhege with karma: 31395 on 2012-09-17
This answer was ACCEPTED on the original site
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Original comments
Comment by Vegeta on 2012-09-17:
Thanks for your reply, in the detailed tutorial that you mentioned , they built a 12 V regulated power supply. I will use the turtlebot board with gyro, it says that the board generates regulated power for the kinect which draws power from the create. So do I still need to make the regulator?
Comment by dornhege on 2012-09-17:
If they provide 12V regulated power, then you can use those. I'm sure there are specs for the boards available. In that case, you only need to connect the kinect power cable with the correct plug.
Comment by Ryan on 2012-09-17:
This question may also help: http://answers.ros.org/question/43830/kinect-and-turtlebot-and-xbox/
Comment by Vegeta on 2012-09-17:
thanks a lot ryan .. that answered everything..