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A simplified diagram ofthe voltage inverter circuit with ideal components and no feedback circuitry is shown in Figure 7. When the switch S is closed, charging current from the battery fiows through the inductor L, which builds up a magnetic field, increasing as the switch is held closed. When the switch is opened, the magnetic field collapses, and the energy stored in the magnetic field is converted into a current which fiows through the inductor in the same direction as the changing current. Because there is no path for this current to fiow through the switch, the current must fiow through the diode to charge the capacitor C. The key to the inversion is the ability ofthe inductor to become a source when the charging current is removed.