Apparatus for applying pulses and pulse edges to a resonant circuit

Abstract An apparatus comprising: a bridge circuit for applying one or more pulse edges to a resonant circuit, the bridge circuit having a first limb in which a first connection point is connected to ground, and a second limb having a third transistor connected between a 5 first power source and a second connection point and a fourth transistor connected between the second connection point and ground, wherein the resonant circuit comprises an inductive element and a capacitor connected in series between the first and second connection points, wherein the inductive element is for inductively heating a susceptor, wherein each applied pulse edge induces a pulse response between the capacitor and the 10 inductive element of the resonant circuit, wherein the pulse response has a resonant frequency. Fig. 5 Vod77 74a i74b 72R~ -- --- 5c: r--- --- --- I :X 76 --- 7 I-7 Fig. 7 Pulse generation 8 82 Z crutResonant circuit Susceptor Pulse response 86 prcssor Output Fig. 8