Hello
i need help to make a circuit.
in this scheme i control motor with MOSFET.i have one accumulator.Motor rotates in one side.How can i change rotation of motor?
How can i change rotation of motor?
H-bridge if you want to change the rotation direction. PWM if you just want to change the rotation speed in one direction.
zoomkat:
How can i change rotation of motor?
H-bridge if you want to change the rotation direction. PWM if you just want to change the rotation speed in one direction.
transistor can transmit current from drain to source and we cant use PWM, no?
can i use this scheme?
That is the scheme, basically. The Upper MOSFETs are generally P-channel and source current to the motor, while the Lower MOSFETs are N-Channel and sink current from the motor.
You need to use Logic Level MOSFETS and +U must be the same as the Arduino Vcc.
If you want Higher +U, then you need transistors in front of the P-Channels so the gates can go fully high (up to U+) to turn the P-channels off.
You can use PWM.
CrossRoads:
If you want Higher +U, then you need transistors in front of the P-Channels so the gates can go fully high (up to U+) to turn the P-channels off.
i don't understand how we can use transistors in front of the P-Channels.Can you draw scheme, please?
So basically like this.
When a control line is high, the N-channel MOSFET gate is High and turned on, and the NPN Base is turned on to bring the P-channel gate Low to turn it on.
When a control line is low, N-channel MOSFET gate is Low and turned off, and the NPN Base is not turned on, allowing the resistor to pull the the P-channel gate High to turn it off.
Some previous h-bridge projects that might be useful for information.
http://arduino.cc/forum/index.php/topic,53425.0.html
http://arduino.cc/forum/index.php/topic,74454.0.html
CrossRoads:
So basically like this.
When a control line is high, the N-channel MOSFET gate is High and turned on, and the NPN Base is turned on to bring the P-channel gate Low to turn it on.When a control line is low, N-channel MOSFET gate is Low and turned off, and the NPN Base is not turned on, allowing the resistor to pull the the P-channel gate High to turn it off.
You circuit has the p-channel MOSFET's drains connected to the positive supply rail - it should be the sources.
