| ??? 04/10/06 18:27 Read: times |
#114036 - additional Transformer occupies space Responding to: ???'s previous message |
Suresh R said:
I need to stepup a 12V rectified o/p to 24 Vdc ... Andy Neil said:
Where does this "12V rectified o/p" come from? If you have a 12V rectified output, doesn't that mean that you have a nearby mains supply? If so, couldn't you just add a 24V transformer? Just a thought... Iam using a 9V/3A transformer whose rectified o/p is 12V. I need two voltage regulations (5VDC and 24VDC) from this 12V o/p. for 5VDC iam using 7805. it powers micro and few other components of the circuit. and, for getting 24VDC(which only powers the solenoid coils through the relay contacts) iam willing to stepup 12V rectified o/p. since i feel that, using seperate transformers for each regulation would occupy space. Also, if using 24V transformer alone(which is also bulky by its own) and stepping it down to get 5Vdc o/p could dissipate more power in the stepdown regulator. So i droped this idea also and started to look for a stepup regulator. But i am not sure of how good is my approach to this issue. iam doing it upto my knowledge. I have the circuit in my work place and i could post it tomorrow for any clarifications you may like to get cleared with what iam saying. Kai Said: So, you need 24V at about 0.2A. 24VDC at 1A would be adequate Kai. Since at times it may require to drive 2 solenoids which could consume more current. and thanks for all for your valuble suggestions. I could get back with a grip on those things. Thanking you, Suresh. |
| Topic | Author | Date |
| step up voltage regulator | 01/01/70 00:00 | |
| 12V rectified output? | 01/01/70 00:00 | |
| additional Transformer occupies space | 01/01/70 00:00 | |
| 18V Center Tap Transformer? | 01/01/70 00:00 | |
| size ? | 01/01/70 00:00 | |
| Mistake in analysis | 01/01/70 00:00 | |
| why two? | 01/01/70 00:00 | |
| Of course! | 01/01/70 00:00 | |
| easier | 01/01/70 00:00 | |
| You are righ Kai. I didnt analyse this w | 01/01/70 00:00 | |
| nope, that is why it is called a switche | 01/01/70 00:00 | |
| Step-up, step-down | 01/01/70 00:00 | |
| ON/OFF(active low) pin? | 01/01/70 00:00 | |
| Shutdown pin | 01/01/70 00:00 | |
Thanks. | 01/01/70 00:00 | |
| Try this simple circuit. It might work | 01/01/70 00:00 | |
| LM2577 | 01/01/70 00:00 | |
| expensive is relative | 01/01/70 00:00 | |
| Charge pump | 01/01/70 00:00 | |
| Thank you all | 01/01/70 00:00 | |
| Two are needed! | 01/01/70 00:00 |