For ideal lossless circuit \(R=0\), the energy stored in \(L\) remains trapped.
In practical circuits, enhancing efficiency involves returning stored energy back to the power source.
Achieved by adding a second winding to \(L\) and connecting a diode \(D_1\).
Combination of \(L\) and secondary winding functions as a transformer.
The secondary winding is arranged such that when \(v_1\) is positive, \(v_2\) is negative with respect to \(v_1\), and vice versa.
The secondary winding responsible for returning stored energy to the source via \(D_1\) is termed a feedback winding.
Assuming a transformer with a magnetizing inductance \(L_m\)
Referring the diode and secondary source voltage to the primary side of the transformer:
Mode-1:
Mode-2:
At the end of this mode all the energy stored in \(L_m\) is returned to the source.
For the energy recovery circuit, \(V_s = 220~\mathrm{V}\), \(L_m = 250~\mu\mathrm{H}\), \(N_1 = 10\), \(N_2 =100\), and there is no initial circuit current. If switch is closed for time \(t_1=50~\mu\mathrm{s}\) and then opened. Determine the following:
the peak value of the primary current,
The peak value of the secondary current \(I_0^{\prime}=I_0/a=44/10=4.4\) A
the conduction time of the diode
The source energy,