02-05-2013, 01:30 PM
Thank you all for your replies.
I decided to use a bridge rectifier to get the EHT that I need, directly from a 60Hz AC winding.
I will use a bridge rectifier with 2,3uF (4.7 + 4.7 in series) cap for the -1,5kV voltage. It will be obtained from a center tapped winding. I will use the center tap to assure that both capcitors will be at the same potential. This will give around 800V, and added in series with the -600V that I already have will give me -1,4kV (+/-) which is enough. In the simulation I got a ripple of less than 200mV with that values.
For the +4kV, I also intend to use a bridge rectifier from another center tapped winding. Same purpose for the center tap. This time I will use around 5 or 6nF to filter the EHT. With a 30uA current (which is the current for the CRT according to the datasheet), the ripple in this PSU will be around 300mV according to simulation.
I guess this levels of ripple will be negligibles. What do you think of this arrangement and ripple level?
I will use a separate transformer for the EHT's and one for the rest of the voltages needed. Both will be enclosured on a steel sheet box, as well as the EHT circuitry. I will take care on isolation.
I decided to use a bridge rectifier to get the EHT that I need, directly from a 60Hz AC winding.
I will use a bridge rectifier with 2,3uF (4.7 + 4.7 in series) cap for the -1,5kV voltage. It will be obtained from a center tapped winding. I will use the center tap to assure that both capcitors will be at the same potential. This will give around 800V, and added in series with the -600V that I already have will give me -1,4kV (+/-) which is enough. In the simulation I got a ripple of less than 200mV with that values.
For the +4kV, I also intend to use a bridge rectifier from another center tapped winding. Same purpose for the center tap. This time I will use around 5 or 6nF to filter the EHT. With a 30uA current (which is the current for the CRT according to the datasheet), the ripple in this PSU will be around 300mV according to simulation.
I guess this levels of ripple will be negligibles. What do you think of this arrangement and ripple level?
I will use a separate transformer for the EHT's and one for the rest of the voltages needed. Both will be enclosured on a steel sheet box, as well as the EHT circuitry. I will take care on isolation.
