| ??? 02/10/06 02:46 Modified: 02/10/06 02:56 Read: times Msg Score: +1 +1 Informative |
#109666 - Combine Responding to: ???'s previous message |
Kaz said:
Could someone please suggest how can I solve this problem? The very simplest methode would be to have a resistor permanently connected across storage cap, like this is done in some stage amps and similar, where also big storage caps are used. Unfortunately, much heat is produced, if a fast fall down of potential is wished. How long may the fall down of potential last? Why is a fast fall down needed at all? Doing switchings by the help of a relay is a bit troublesome, because contacts can enormously suffer from sparkings. A good methode would be to combine the turn-off of power supply with the turn-off of motor by additional soft- or hardware: When you want to turn-off the power supply, first turn-off the motor. Then there will be no further current flow and the power supply to motor can be disconnected without sparking. Turning-off power supply should turn-off both, (a) mains from primary side of transfomer and (b) connection between storage cap and motor. Use two separate relays for this. By the way, it's not a good idea to always discharge the storage caps, when switching-off the power supply. Keeping the storage caps charged can be advantageous. Also, do you already need a soft start, when switching the transformer to mains? I guess so. Kai |
| Topic | Author | Date |
| Discharging capacitors? | 01/01/70 00:00 | |
| sorry I missed that.. | 01/01/70 00:00 | |
| many versions have been implemented | 01/01/70 00:00 | |
| Simplest | 01/01/70 00:00 | |
| Alternatively... | 01/01/70 00:00 | |
| Switch | 01/01/70 00:00 | |
| thankyou | 01/01/70 00:00 | |
| Emergency stop | 01/01/70 00:00 | |
| Soft start | 01/01/70 00:00 | |
| Combine | 01/01/70 00:00 | |
| if it has to be done the right wa | 01/01/70 00:00 | |
| SPS? | 01/01/70 00:00 | |
| if a SPS is a switching power supply - y | 01/01/70 00:00 | |
| resistor value ?? | 01/01/70 00:00 | |
| DIY | 01/01/70 00:00 | |
| Hmm... | 01/01/70 00:00 | |
the crux | 01/01/70 00:00 | |
| check current rating of capacitors ... | 01/01/70 00:00 | |
| search | 01/01/70 00:00 |