Simplified magnetic amplifier circuitry


Posted on Feb 5, 2014

The power that is used for realignment is a loss as far as the rest of the circuit is concerned. Because of this hysteresis loss in the saturable-core reactor, the power gain is relatively low. A rectifier added to the load circuit will eliminate the hysteresis loss and increase the gain. This is because the rectifier allows current to flow in only one direction through the load coils.


Simplified magnetic amplifier circuitry
Click here to download the full size of the above Circuit.

A simple half-wave magnetic amplifier is shown in figure 3-38. This is a half-wave magnetic amplifier because it uses a half-wave rectifier. During the first half cycle of the load voltage, the diode conducts and the load windings develop load flux as shown in view (A) by the dashed-line arrows. The load flux from the two load coils cancels and has no effect on the control flux. During the second half cycle, the diode does not conduct and the load coils develop no flux, as shown in view (B). The load flux never has to reverse direction as it did in the saturable-core reactor, so the hysteresis loss is eliminated. The circuit shown in figure 3-38 is only able to use half of the load voltage (and therefore half the possible load power) since the diode blocks current during half the load-voltage cycle. A full-wave rectifier used in place of CR1 would allow current flow during the entire cycle of load voltage while still preventing hysteresis loss. Figure 3-39 shows a simple full-wave magnetic amplifier. The bridge circuit of CR1, CR2, CR3, CR4 allows current to flow in the load circuit during the entire load voltage cycle, but the load current is always in the same direction. This current flow in one direction prevents hysteresis loss. View (A) shows that during the first half cycle of load voltage, current flows through CR1, the load coils, and CR3. View (B) shows that during the second half cycle, load current flows through...




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    dc motor controller circuit
    Lights Control for Model Cars
    1993 vw passat electrical schematic
    interfacing lcd
    Simple Solar Table Lamp Circuit for your Home
    Audio clipping indicator circuit
    Sound pressure meter
    OpenLx USB DMX interface
    Creating an HID Ballast with Constant Lamp Power Control
    MAX8844 lithium ion charger electronic circuit design
    Stepper Motor Driver
    Touch Screen Model
    Coil Winding machine counter with Atmega8 and Reed relay



    Top