Diode bridge

Single-phase full-wave diode rectifier.

  • electrical
  • Modelica Standard Library
  • 4 ports
  • 2 parameters
BlockDiode bridgeKinddiodeBridgeLibraryConverters

Description

A single-phase full-wave (two-pulse) rectifier of four ideal diodes. dc_p is fed from ac_p and ac_n through two diodes; dc_n returns through the other two.

There is no smoothing capacitor; add one across dc_p and dc_n if needed.

Example

Rectifier bridges A diode bridge and a thyristor bridge fired at 90°, each feeding a 10 Ω load from a 10 V sine.

10 V 50 HzGroundDiode bridgeLoad (diodes)v DC (diodes)10 V 50 Hz (thyristors)Ground (thyristors)Thyristor bridgeLoad (thyristors)v DC (thyristors)Fire + at 90°Fire − at 90°
In Gradara, select a Diode bridge block and press F1, then choose Open example. It opens as a new model in My models, ready to run.

Also in this example:Voltage sensorGroundResistorAC voltageThyristor bridgeBoolean pulse

Ports

Conserving terminals 4

  • ac+ac_pelectrical

    AC terminal 1.

  • ac−ac_nelectrical

    AC terminal 2.

  • dc+dc_pelectrical

    DC positive terminal (common cathode of the upper diodes).

  • dc−dc_nelectrical

    DC negative terminal (common anode of the lower diodes).

Parameters

  • Diode on resistanceRonDiode0.00001 Ω

    ≥ 0

    On resistance of each diode, in ohms. 0 or more.

  • Diode off conductanceGoffDiode0.00001 S

    ≥ 0

    Off conductance of each diode, in siemens. 0 or more.

Equations

Modelica
With a resistive load and no capacitor: dc_p.v − dc_n.v ≈ |ac_p.v − ac_n.v|

Implementation

Modelica Standard Library 4.1.0Modelica.Electrical.PowerConverters.ACDC.DiodeBridge2Pulse
MSL documentation

Assumptions and limitations

  • Ideal diodes with the knee voltage fixed at 0 V: no forward drop, reverse recovery, or junction capacitance.

Used in

These larger examples use it too. Open them from Examples in the app.

  • 480 VAC → 24 VDC flyback

See also

Select a block in Gradara and press F1 to open its page offline.