yes thanks tony . perhaps one day you can interpret it into very simple english for me !!
Not a problem, will break it down in a non Rhode & Schwarz manner .
SMPS are all about three main benefits over tradition linear power supplies:
Power density factor (Grunt per square mm) Power output Vs size smps are far more powerful per 'real estate' than LPS in that I can generate 20 amps in a far smaller package (No big transformer required)
Cost factor, using components which are cheaper and easier to mount on smaller circuit boards, cheaper to produce.
Size is on the whole much smaller and compact easier to site within a box or case
Virtually everything uses smps now, very widely available 'off the shelf' psu's for almost any application.
One of the big advantages for SMPS is speed?, what really? well yes this equates to much smaller storage / smoothing capacitors sizes.
A UK LPS has just 50Hz (50 cycles a second) to work with so basically the recharge time for the capacitors is quite long therefore necessitating the need for much larger capacitors to hold the charge longer until to the next charge cycle occurs, compare to say a basic SMPS which can switch (charge the capacitors) anything from 20Khz (twenty thousand times a second) upwards. So basically the recharge time on to the capacitors is much, much smaller so the 'sag' between the charges is hugely reduced which in turn leads to MUCH smaller capacitors required to deliver the same power.
Hence why the cap sizes on SMPS are significantly smaller along with smaller transformers etc.
Downsides to smps supplies:
RF noise due to the higher switching frequencies which are required to 'chop up' rectified dc into much smaller segments.
Not ideal for big power reserves unless you have multi smps units power a full capacitor super storage bank.
Careful placement and understanding of how a SMPS works and how the 'high side' must be totally isolated from the 'low side'
For sensitive noise application much more work must be applied to reduce the power rail noise to acceptable levels for sensors/audio/RF applications much more indepth work on a/c filtration plus DC noise suppression filter banks.
To sum up this section:
SMPS cheaper/easier/mass production simpler/greater choice/smaller footprint
Noise generation both a/c harmonics and common mode (if poor incoming filtering techniques used) DC power rail integrity needs attention for more sensitive applications
Extra sheilding required to help with above noise issues so more space required
Critical placement of smps within chassis as not to upset any other rf susceptible components.
They are a few more that would bore you Phil
Next part on how it works simply
www.coherent-systems.co.uk Specialist audio consultancy with a total emphasis on musical reproduction. Audio, green energy, IoT designer and volt-nut power supply guy.
World Champion Whippet Thrasher & Toe Tapper converter, Sailsburys nemesis for over 20 years
I saw this article in What caravan eariler this afternoon, I tried hard not piss myself laughing but you have admire his staunch company line towing policy, however John Franks has been careful to place a remote 100Kva probes on either of his testicles at press conferences I suspect.
To replicate anywhere near lps quietness you would need to go to full space fairing psu's / ulratrick T&E style power and uber medical varients but a wall wart really
Why do most Chord Electronics DAC products use what appears to be cheap wall-wart power supplies?
Because the units themselves have internal power regulation and RF filtering. Adding ‘better’ power supplies will either make no difference or make it sound worse (brighter) – so superficially more impressive but actually worse due to increased RF noise from big linear PSUs.