| ??? 02/08/06 14:16 Modified: 02/08/06 14:20 Read: times |
#109507 - Again Responding to: ???'s previous message |
Saif said:
so as mr kai sugeested that due to a fix load there might be a problem like this. If you connect a load to secondary side of transformer you will see a voltage drop, which highly depends on the actual load. Assume you have a transformer, that outputs a voltage of 15V if no current is drawn. If you increase the load, so that 1A is drawn, then the transformer output voltage shall give 12V, and if you increase furtherly the load, so that 2A is drawn, then output voltage shall be 10V. Now, if you have an additional secondary winding and you measure the output voltage of this secondary winding, then you will not see output voltages of 15V, 12V and 10V when you change the load at main output winding (the winding of above example!), but a voltage which remains nearly constant. So, if you want to use the secondary winding of this transformer, where the output voltage does not relevantly change, to derive a feedback to control the output voltage of main output winding to stay contant, when changing its load from 0A to 1A and 2A, then you will not be successful!!! Kai |
