| ??? 04/28/11 15:57 Read: times |
#182085 - read the datasheet Responding to: ???'s previous message |
ac wave (after sampling transformer) is directly fed to the ADC pin after a resistive divider. I have seen this used in PIC/AVR/Freescale based designs. When the voltage goes negative, the diodes at the input clamp the voltage. Only the positive half is sampled since it is assumed that negative half would match the positive half, for almost all kinds of loads.
How safe is this method? the ADC you use will, in its datasheet, have a Vin min spec. If that is below a diode drop, then the method should be safe. another method would be to insert a DC component using an OP-amp. Erik |
| Topic | Author | Date |
| Zero crossing without precision rectifier | 01/01/70 00:00 | |
| read the datasheet | 01/01/70 00:00 | |
| Inserting a DC component | 01/01/70 00:00 | |
| ??? | 01/01/70 00:00 | |
| Explanation | 01/01/70 00:00 | |
| No need to align with any zero axis | 01/01/70 00:00 | |
| Great | 01/01/70 00:00 | |
| Are you sure your current/voltages are sine waves? | 01/01/70 00:00 | |
no sinusodal currents | 01/01/70 00:00 |