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power_supply_design.php   9950 Bytes    18-07-2014 21:14:16


LINEAR POWER SUPPLY DESIGN ASSISTANT #1

This first part deals with rectification / smoothing capacitors.

Schematics Linear power Supply


Linear Power Supply Building Block. Starting from the left, we have a fuse, a transformer, a bridge rectifier, smoothing capacitor, and 'the load'.



YOUR PARTS


Line Frequency

  [Hz]

Trafo (sec.)

  [V]

Trafo (sec.)

  [A]

Regulation (Trafo)

  [%] ΔU/Uload *100%

Load

  [Ω]

Diode Drop (each)

  [V], (Use 0.75 for Silicon, 0.45 for Schottky)

Diode Bulk Resistance

  [Ω]

Storage Capacitor

  [µF]  





VERTICAL: voltages [V], current [A], HORIZONTAL: time [ms]





It is very seductive to increase the capacity in order to have a low ripple, but doing so will increase the inrush current (green). If it is too high, you may hear it (the 'ka-woom' when switching on) and you do stress the components, so they will die earlier :-(
The situation gets even worse, when not switched on while the voltage crosses zero ...

This website was inspired by Ken's Web Site.

Highly recommended : John Errington's tutorial on Power Supply Design.





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t1 = 3943 d

t2 = 401 ms

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