Transformerless Power Suppply

[comwarrior]

Strangely, i have a design for a transformer-less PSU in the making...
My reason for not using a transformer is because to have a transformer that drops 110V and 240V down to a more usable voltage and supply the current i need would be massive and it costs >£50 each...

I'm not going to post details of the PSU because i intend on filing for international copyright.
The reason for this is because it will handle any single phase voltage, frequency and amount of noise (or noise only) you can throw at it.
It will even operate in a brown out with sustained unstable voltages as low as 24V (maybe lower).
It can also handle stepped AC, Square wave and saw tooth signals provided it is alternating...

Also, Mel is absolutely right, that AN is written for one purpose and one purpose only... TO KILL PEOPLE!

[rmteo]

Something like this PSAA60W-120

AC Input Voltage Rating: 100 to 240V AC
AC Input Frequency: 50 to 60Hz
Input Current: 1.6A at 100V AC, 0.7A at 240V AC
Output: 60W
Efficiency: 85% average

[comwarrior]

transformer-less... the above has a transformer, i can tell because of the input specification.

Here in the UK the current code for mains wiring dictates the use of an ELCB.
Earth Leakage Circuit Breaker. If more than 50mA flows up or down the earth wire the ELCB will trip isolating both live and neutral.
every time I've diagnosed wiring faults, their has always been a 50 to 60 V AC difference between earth and ether neutral or live...
If you use an isolation transformer you can connect the negative after rectification to ground. This is what most PC PSU's do.

edit:
That efficiency rating is crap!