Speakerguy
Active Member
I have a PWM + half-bridge driver board from an old project. It has a 15V regulated section for the triangle wave generator and the half bridge driver and the half bridge voltage can go anywhere up to 200V (filter cap / MOSFET limit). It was meant to run off of rectified AC in the US.
Anyway, I have a big 12V gearmotor I need to control the speed of. I can power the above board with a 24V supply to both the 15V linear regulator and directly to the FET's no problem, and I have a stout 24V switcher on hand (13A or so).
1) What PWM duty cycle do I want for 'max' speed (25% or 50%)? The whole average voltage vs average power thing.
2) Will I damage the motor in any way by running it in such a fashion instead of off a 12V supply?
3) It's a half bridge config. Freewheeling diodes are necessary, yes?
4) 1KHz sound about right for a PWM freq?
Thanks for any help.
Anyway, I have a big 12V gearmotor I need to control the speed of. I can power the above board with a 24V supply to both the 15V linear regulator and directly to the FET's no problem, and I have a stout 24V switcher on hand (13A or so).
1) What PWM duty cycle do I want for 'max' speed (25% or 50%)? The whole average voltage vs average power thing.
2) Will I damage the motor in any way by running it in such a fashion instead of off a 12V supply?
3) It's a half bridge config. Freewheeling diodes are necessary, yes?
4) 1KHz sound about right for a PWM freq?
Thanks for any help.
Last edited: