Capacitive Power Supply Circuit with Maximum Protection

A comprehensive capacitive power supply circuit having a zero crossing detector, a surge suppressor and voltage regulator is discussed here, the idea was was submitted by Mr. Chamy

The Design

Hello Swagatam.

This is my zero crossing, surge protected capacitive power supply design with voltage stabilizer,i will try to list all of my doubts.
(I know this will be expensive for the capacitors,but this is only for testing purposes)

1-I’m not sure if the BT136 haves to be changed for a BTA06 for accommodating more current.

2-The Q1 (TIP31C) can handle only 100V Max. Maybe it should be changed for a 200V 2-3A transistor?,like the 2SC4381.

3-R6 (200R 5W),I know this resistor is pretty small and its my
fault,i actually wanted to put a 1k resistor.But with an 200R 5W
resistor it would work?

4-Some resistors have been changed following your recommendations to make it 110V capable.Maybe the 10K one needs to be smaller?

If you know how to make it work correctly,i will be very happy to correct it.If it works i can make a PCB for it and you could publish it in your page (For free of course).

Thank you for taking the time and viewing my full of faults circuit.

Have a nice day.

Chamy

My Reply:

Hello Chamy, your circuit looks OK to me.

Here are the answers to your questions:

1) yes BT136 should be replaced with a higher rated triac.

2)TIP31 should be replaced with a Darlington transistor such as TIP142 etc
otherwise it might not work properly.

3) when a Darlington is used the base resistor could be high in value, may be a 1K/2
watt resistor would be quite OK.

However the design by itself looks an overkill, a much simpler version can
be seen below

http://ift.tt/2dXFBt1

Regards
Swagatam