Hi.
too long, didn't read: please check the circuit below for any failures and provide feedback on overall implementation
I've started a little fun project to build a MCU-controlled brushless motor driver. This is basically three "halfs" of a H-bridge. I have the schematic, but I'd appreciate if you guys checked it for obvious flaws since this is all new to me.
I do not consider using a single-chip driver, I need the experience I get doing this project.
Design considerations
Component choice is limited; here's what I've come up so far:
Just one note on the circuit: I specifically want hardware short protection, even though this thing is MCU-controlled.
The short protection works as follows: the opening signals for high and low sides also go to the AND gate, and if both are present, the gate opens a transistor which pulls the signals down.
too long, didn't read: please check the circuit below for any failures and provide feedback on overall implementation
I've started a little fun project to build a MCU-controlled brushless motor driver. This is basically three "halfs" of a H-bridge. I have the schematic, but I'd appreciate if you guys checked it for obvious flaws since this is all new to me.
I do not consider using a single-chip driver, I need the experience I get doing this project.
Design considerations
- The motor is from a WD drive, 3-coil with common ground (wye winding according to wikipedia), singe coil resistance of about 0.9 Ohm; will run at 2 A @ 12 v (resistor added to limit current)
- The power supply is an ATX PSU, 5v for logic, 12v for the motor
Component choice is limited; here's what I've come up so far:
- IRF7319 N + P channel FET
- 2N4401 NPN transistor for high side driver and short protection
- 74HC08D quad AND gate for short protection logic
- 1N4148 diode for short protection
- ATmega48 for control
Just one note on the circuit: I specifically want hardware short protection, even though this thing is MCU-controlled.
The short protection works as follows: the opening signals for high and low sides also go to the AND gate, and if both are present, the gate opens a transistor which pulls the signals down.
Attachments
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