A voltage clamp circuit comprising: an input portion arranged to receive an input voltage at an input terminal, said input portion comprising a clamp diode (D3, D4,... Dn) having an anode thereof connected to the input terminal; a switching element having a first terminal, a second terminal, and a control terminal, wherein the first terminal is connected to a cathode of the clamp diode (D3, D4,... Dn), and wherein the control terminal is connected to a reference node (Vref); and a resonant tank portion comprising an inductor and a capacitor connected in series at a resonance node (Vres), said resonance node being further connected to the second terminal of the switching element, wherein the capacitor is connected between the resonance node and the first terminal of the switching element, and wherein the inductor is connected between the resonance node and an output terminal of the voltage clamp circuit; wherein the switching element is arranged such that when a voltage at the first terminal of the switching element is greater than a threshold value determined by a reference voltage at the reference node (Vref), the switching element is turned on such that a conductive path is formed between the first and second terminals of the switching element; wherein the resonant tank further comprises first and second resonant tank diodes (D6, D7), wherein the inductor is connected between a cathode of the first resonant tank diode and an anode of the second resonant tank diode; wherein the cathode of the first resonant tank diode is connected to the resonant node; wherein a cathode of the second resonant tank diode is connected to the output terminal of the voltage clamp circuit; wherein an anode of the first resonant tank diode is connected to an output return terminal of the voltage clamp circuit. an input portion arranged to receive an input voltage at an input terminal, said input portion comprising a clamp diode (D3, D4,... Dn) having an anode thereof connected to the input terminal; a switching element having a first terminal, a second terminal, and a control terminal, wherein the first terminal is connected to a cathode of the clamp diode (D3, D4,... Dn), and wherein the control terminal is connected to a reference node (Vref); and a resonant tank portion comprising an inductor and a capacitor connected in series at a resonance node (Vres), said resonance node being further connected to the second terminal of the switching element, wherein the capacitor is connected between the resonance node and the first terminal of the switching element, and wherein the inductor is connected between the resonance node and an output terminal of the voltage clamp circuit; wherein the switching element is arranged such that when a voltage at the first terminal of the switching element is greater than a threshold value determined by a reference voltage at the reference node (Vref), the switching element is turned on such that a conductive path is formed between the first and second terminals of the switching element; wherein the resonant tank further comprises first and second resonant tank diodes (D6, D7), wherein the inductor is connected between a cathode of the first resonant tank diode and an anode of the second resonant tank diode; wherein the cathode of the first resonant tank diode is connected to the resonant node; wherein a cathode of the second resonant tank diode is connected to the output terminal of the voltage clamp circuit; wherein an anode of the first resonant tank diode is connected to an output return terminal of the voltage clamp circuit.