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Registered Member #105
Joined: Thu Feb 09 2006, 08:54PM
Location:
Posts: 408
I wrote this for the underwater robot controller that happens to work now :) does anyone see any errors? If this is against the rules, feel free to delete it, but i thought all you would be the best error checkers...
#2 The controller for the motors in the underwater robot consists of four separate H-bridges of MOSFETs. MOSFET stands for “Metal Oxide Semiconductor Field Effect Transistor,†and they are used as high current switches that are triggered by voltage on the gate. Using twelve volts at a very low current to switch each motor on and off allows us to use one power buss to the robot, and one very thin eight conductor wire. There is a pair of wires for each motor, one for forward and one for reverse. Because the MOSFETs need to be turned on and off very quickly to minimize switching losses and maximize efficiency, we used four TC4427 MOSFET drivers. By using MOSFET drivers, the turn-on time is minimized, which also minimizes heat in the container. There are also pull-down resistors used on the driver chips in order to reduce the possibility of an accidental turn on of the driver chips. The resistors drain the stray voltage picked up in the long control wire to ground potential. The use of the H-Bridge topology could also allow easy onboard power from a battery, as well as remote capabilities, and speed control.
#1 The controller for the motors in the underwater robot consist of four separate H-bridges of MOSFETs. MOSFET stands for “Metal Oxide Semiconductor Field Effect Transistor,†and are used as high current switches that are triggered by very low currents. Using low current to switch each motor on and off allows us to use one power buss to the robot, and one very thin eight conductor wire. There is a pair of wires for each motor, one for forward and one for reverse. In order to make the MOSFETs work the most efficiently, they must be turned on very quickly to reduce switching losses, which equate to heat that is created when the switch is turned on. By using four TC4427 Dual MOSFET drivers, the turn-on time is minimized, which also minimizes heat in the container. There are also pull-down resistors used on the driver chips in order to reduce the possibility of an accidental turn on of the driver chips. The resistors drain the stray current picked up in the long control wire to ground potential. The use of the H-Bridge topology could also allow easy onboard power from a battery, as well as remote capabilities, and speed control.
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
I would change 'consist' to consists In the second sentence I would add a 'they' between 'and' and 'are' In the third I change 'current' to 'currents', or 'a current' The sentence starting 'in order to make...' seems kind of out of place, I would change it to 'Because the mosfets need to be turned on of off very quickly to minimise switching losses and maximise efficiency we use four tc4227...
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
I would change
MOSFET stands for “Metal Oxide Semiconductor Field Effect Transistor,†and they are used as high current switches that are triggered by voltage on the gate. to MOSFET stands for “Metal Oxide Semiconductor Field Effect Transistor,†and they are used here as high current switches that are controlled by voltage from source to gate.
and
By using MOSFET drivers, the turn-on time is minimized, which also minimizes heat in the container. to By using MOSFET drivers, the turn-on and turn-off times are minimized, which also minimizes heat in the container.
and
The resistors drain the stray current picked up in the long control wire to ground potential. to The resistors drain any stray current picked up in the long control wire to ground potential.
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Just a little bit of checking my work :)
