Hi all,
I have been building an electric trike and the controller on it is giving me a load of crap. The pwm signal from opamps gets fed into transistors (push pull) and then directly into the gates of 5 IRFZ48N mosfets (64A@55v). The mosfets are on an forced air cooled heatsink and i dont belive that they are over heating.
I am using diodes both reverse biased parallel with the motor and with the mosfets. There is also 2000uf capacitors on both the supplies. Oh and the supply voltage is +-12v (2 car batteries).
When i turn it on it works until i turn the power up to high and then mosfet breakdown occurs and the motor spins at full speed and cannot be slowed down until switched off.
Does anyone know what is going on here?
I have been building an electric trike and the controller on it is giving me a load of crap. The pwm signal from opamps gets fed into transistors (push pull) and then directly into the gates of 5 IRFZ48N mosfets (64A@55v). The mosfets are on an forced air cooled heatsink and i dont belive that they are over heating.
I am using diodes both reverse biased parallel with the motor and with the mosfets. There is also 2000uf capacitors on both the supplies. Oh and the supply voltage is +-12v (2 car batteries).
When i turn it on it works until i turn the power up to high and then mosfet breakdown occurs and the motor spins at full speed and cannot be slowed down until switched off.
Does anyone know what is going on here?