“…Theoretically, a reversely connected inverter becomes a rectifier. For example, the half bridge inverter, full bridge inverter, and class E inverter become half bridge rectifier [55], full bridge rectifier [56,57], and class E rectifier [58], as shown in Figure 2.17 However, for the rectifier, the ac power is from the resonator and hence the switches need to turn ON and OFF following the phase of ac power. Taking Q1 in Figure 2.17 as an example, when ac power is flowing to Vo that io>0, Q1 shall be turned ON.…”