I am trying to design a small control circuit for controlling large currents (not too large, around 200W, AC 50Hz). I have kept in the AC circuit isolated from the DC control circuit. But the problem arises when it comes powering the control circuit. My control circuit will take maximum of 1W of power at any time during its operation. Also I am bound to not use any battery for this purpose and the size of this circuit has to very small (smaller than a typical mobile phone charger).
Since the load is very small I was wondering if can use AC supply from mains to power it by converting the supply voltage to DC using a rectifier and then using a potential divider to lower the voltage to usable form (Note: Since the space available to me is very small, I cant use a transformer to step down the voltage).
So my question is that can I use this configuration to power the small load (1W). The schematic is attached. I know that voltage regulation will be affected but I have no idea "How much".