ok so i've gotten 2 designs completely worked out for some SMPS's, one being a buck converter, and the other being a buck boost...i'm gonna be using them for an amplifier i made, so i needed both the +/- voltages, in case you were wondering about the buck boost design.
anyways on to the real question....i was looking around at different stuff online and apparently it is a good idea to put a mains filter before the diode bridge so that you don't get some high frequency currents going back into the mains wiring...apparently that can screw some things up. one of the circuit diagrams i came across was this right here:
http://www.lcdmonitorrepairebook.com/wp-content/uploads/2010/04/smps-schematic.png
now, this schematic is not for the power level i will be using (200 watt or so per polarity on my SMPS) , nor is it the actual circuitry for the SMPS...i was just looking at the filter on the mains wiring and components.
Is the filter used on this circuit a pretty typical design? I've taken apart some computer monitors before and have seen something very similar to this inside of them, i just never realized what purpose they served. Is there any specific math that goes along with designing these types of filters? I'm sure there is some sort of math, as there is for anything in electronics, but does a filter require particular values of components, or is it just something like "use 'such and such' range of capacitance, and 'such and such' range of inductance and you will be just fine"?
i've never really delved into power supply filters before as i have not needed them until now, so any help would be appreciated!![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
anyways on to the real question....i was looking around at different stuff online and apparently it is a good idea to put a mains filter before the diode bridge so that you don't get some high frequency currents going back into the mains wiring...apparently that can screw some things up. one of the circuit diagrams i came across was this right here:
http://www.lcdmonitorrepairebook.com/wp-content/uploads/2010/04/smps-schematic.png
now, this schematic is not for the power level i will be using (200 watt or so per polarity on my SMPS) , nor is it the actual circuitry for the SMPS...i was just looking at the filter on the mains wiring and components.
Is the filter used on this circuit a pretty typical design? I've taken apart some computer monitors before and have seen something very similar to this inside of them, i just never realized what purpose they served. Is there any specific math that goes along with designing these types of filters? I'm sure there is some sort of math, as there is for anything in electronics, but does a filter require particular values of components, or is it just something like "use 'such and such' range of capacitance, and 'such and such' range of inductance and you will be just fine"?
i've never really delved into power supply filters before as i have not needed them until now, so any help would be appreciated!