Bridge rectifier using MosFet transistors

[Boncuk]

Hi to all,

I found this circuit in a german electronics magazine.

**broken link removed**

The simulation using Proteus Isis is not satisfactory at all. Reducing the circuit to a two way rectifier results are very poor. (High ripple voltage using a 15.000MF capacitor and a load current of 5A.)

Anybody here who built a similar circuit with better results? That circuit would make sense for low input voltages only. At 6V AC-input the output voltage normally drops to 75% using silicon rectifier diodes due to the forward voltage drop of the diodes.

 

[Roff]

What frequency are you trying to rectify? I calculate about 3V ripple at 50Hz. This is not a problem with the circuit. If you need less ripple, you need more capacitance.

 

[Boncuk]

Frequency is mains 50Hz.

Simulation conditions: Input 15VAC/50Hz, electrolytic capacitor 4700uF, load current 2A, ripple slightly above 3V, DC-Voltage 12.1V

The gates are pulled up to 10V via 100ohms resistors. Decreasing the gate voltage below 10V the output voltage decreases considerably. Transistors used: IRF4905