Hello,
In my mind, there are two ways to do this. However, I don't know pros, cons, and cost-effectiveness of each.
http://lh6.ggpht.com/_X6JnoL0U4BY/S26tzJ3HCtI/AAAAAAAASCI/p_k2WzgjVb4/tmp166_thumb.jpg?imgmax=800
The link above presents driving one from SCRs. The 4 SCRs can't reverse the motor's direction, thereby requiring another four to do so. However, as shown, the topology is work best with 3 phase.
The other way is using a bridge rectifier and a dc-dc converter to convert 220V to 48Vdc. Subsequently, a h-bridge mosfet driver is conneted to 48Vdc to drive my motor. This allow me to control both speed and direction. However, the converter requires a transformer for safety. I'm afraid that the transformer will dump the overall efficiency down.
Which way should I take? Is this a trading off between smoothness of dc voltage across the motor and the overall efficiency?
Thanks
BlackMelon
In my mind, there are two ways to do this. However, I don't know pros, cons, and cost-effectiveness of each.
http://lh6.ggpht.com/_X6JnoL0U4BY/S26tzJ3HCtI/AAAAAAAASCI/p_k2WzgjVb4/tmp166_thumb.jpg?imgmax=800
The link above presents driving one from SCRs. The 4 SCRs can't reverse the motor's direction, thereby requiring another four to do so. However, as shown, the topology is work best with 3 phase.
The other way is using a bridge rectifier and a dc-dc converter to convert 220V to 48Vdc. Subsequently, a h-bridge mosfet driver is conneted to 48Vdc to drive my motor. This allow me to control both speed and direction. However, the converter requires a transformer for safety. I'm afraid that the transformer will dump the overall efficiency down.
Which way should I take? Is this a trading off between smoothness of dc voltage across the motor and the overall efficiency?
Thanks
BlackMelon