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Not stabilized DC power supply with a double half-wave rectifier.

Monophase DC power supply with a center-tapped transformer, not stabilized output.

Dimensioning of DC power supply with not stabilized output using a double half-wave rectifier realized with a double secondary winding, 2 silicon diodes and leveling capacitor filter with ripple reduction (residual waving).

Data input
Transformer data (nominal values).

Nominal voltage of the PRIMARY winding

V ac NOM

Nominal voltage of the SECONDARY winding

V ac NOM

Nominal power of the transformer


Supply frequency.

50 Hz (sinusoidal)

60 Hz (sinusoidal)

Leveling capacitor data.

Total capacity of the filter capacitors . . . C


Define automatically an appropriate capacity
based on the above data

Wait value.
Working point of the power supply.

Real supply voltage:


V ac EFF

Real applied load:




Wait calculate.
Transformer :
Theoretical transformation ratio
Percentage of characteristic voltage drop relative to the nominal power of the transformer %
Secondary no-load voltage with real applied supply voltage V max
Secondary voltage drop related to the applied load V ac
Real output voltage of the secondary winding related to the applied load V ac EFF
Peak-to-Peak voltage on the secondary related to the applied load V PEP
Rectifier + capacitor filter :
Rectified voltage related to the applied load Vp
Rectified RMS voltage related to the applied load V EFF
Output ripple related to the applied load and to the filter capacity choosed Vrpp
Considered voltage drop of the rectifier V
Minimal power dispersed by the rectifier (diodes) with the applied load W (diodes)

Voltage drop on the secondary caused by the load can change in function of construction or designing of the transformator itself.

The no-load output voltage of the transformator is obtained summing the expected drop at the maximum power at the nominal voltage. Pratically the output voltage at the nominal power will be equals to the nominal voltage.

The output ripple (Vrpp) can change in function of the quality of the used capacitors.

The ripple value (Vrpp) is made reasonably valid up to 50% of V RMS, beyond this value the inaccuracy increases.

Normally a supply must be able to work correctly with supply voltages which can change at least of +/- 10% respect to the nominal or the project value.

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The applications for powersupply.

Not stabilized,
rectifier 1 diode.
Not stabilized,
rectifier 2 diodes.
Not stabilized,
bridge rectifier.
bridge rectifier,
linear voltage regulator.
  • Powersupply half-wave.
  • Powersupply full-wave.
  • Powersupply bridge rectifier.
  • Linear stabilized powersupply.