| ??? 10/20/06 08:57 Read: times |
#126798 - only good for small motor Responding to: ???'s previous message |
well this has turned now to a more motor control discusie, but anyway controlling only the lower side with PWMs and having the upper one always either On or Off, works only if you are using a motor with a small current. Because if 4 is PWM and 1 is always ON, during the off time of the PWM, the current is still there, and it goes through 4 and through the body diode of 3. The power dissipation in 3 will be enornmous if the current is big...Vdiode* current... and a solution to reduce that is to turn 3 ON while 1 is Off, then Off before 1 is On again... so 1 is driven by a PWM signa and 3 is driven by the same PWM signal but inverted plus some dead time=> now the power dissipation is I2xRdson... |
| Topic | Author | Date |
| Full bridge controlled by 4 PWMs | 01/01/70 00:00 | |
| This will tell you how to post a diagram | 01/01/70 00:00 | |
| one way | 01/01/70 00:00 | |
| Danger ahead | 01/01/70 00:00 | |
| Hmm. | 01/01/70 00:00 | |
| an even better Idea | 01/01/70 00:00 | |
| an even even better idea | 01/01/70 00:00 | |
| maybe IR has something | 01/01/70 00:00 | |
| found a way... | 01/01/70 00:00 | |
| Switching | 01/01/70 00:00 | |
| switching.... | 01/01/70 00:00 | |
| lets put it this way | 01/01/70 00:00 | |
| only good for small motor | 01/01/70 00:00 | |
| schematics | 01/01/70 00:00 | |
| IPM? | 01/01/70 00:00 | |
IPM | 01/01/70 00:00 | |
| My Code | 01/01/70 00:00 |