Components’ Notations

Specifications

$T_{x1}$

230 - 12 V, 300 W, 50 Hz iron core step-down transformer with a turns ratio of $N_1:N_2=38:2$

$D_1-D_4$ , $D_s$ , $D_c$ , $D_{s1}-D_{s4}$ , $D_{sr}$ & $D_r$

Power diodes

$L_r$

0.1 mH, rectifier output filter inductance

$C_r$

500 μF, rectifier output filter capacitance (25 V electrolytic capacitor)

$L_c$

0.95 mH, boost converter input inductance

$C_c$

47 μF, boost converter output capacitance (50 V electrolytic capacitor)

$Q_c$ , $Q_{i1}-Q_{i4}$ & $Q_r$

N-channel enhancement type MOSFET with an absolute maximum on-resistance, $R_{on}=17.5\text{m}\Omega$ and maximum drain current, $I_D=49\text{A}$

Battery

12 V (rated nominal voltage), 7.5 A-h (capacity) and 9 V (cut-off voltage)

$R_{s1}-R_{s4}$

225 Ω, snubber resistance

$C_{s1}-C_{s4}$ & $C_{sr}$

10 nF, snubber capacitance

$T_{x2}$

12 - 230 V, 400 W, 50 Hz iron core step-up transformer with a center-tapped primary side and a turns ratio of $n_1:n_2:n_3=2:2:38$

$L_o$

21.2 mH, inverter output filter inductance

$C_o$

470 μF, inverter output filter capacitance (250 V electrolytic capacitor)

A

Op-amp with the biasing voltage of $V_{+}=12\text{V}$ and $V_{-}=0\text{V}$

$R_{r1}$ & $R_{r2}$

1 kΩ and 12 kΩ respectively, resistances in the input terminal of the battery charge controller circuit

$V_{dd}$

12 V, biasing voltage of the relay switching circuit

C, NO & NC

Common, normally open and normally closed terminals of a 250 V, 20 A, SPDT electromechanical relay

Transfer Switch

250 V, 30 A, 3 ms (transfer rate) electromechanical relay

Loads

In simulation, an R-L load of $R=500\Omega$ and $L=27\text{mH}$ with a maximum power consumption of 103.59 W