Patent ID: 9391593
Filing Date: 2016-07-12
CPC Classification: H01J,H02M,H03K,Y02B

Claim Text:
1. A mass spectrometer including: a circuit for generating a voltage waveform at an output node; and a load capacitance to which the output node of the circuit is connected so that, in use, the load capacitance receives a voltage waveform generated by the circuit; wherein the circuit includes: wherein the control unit of the circuit is configured to control the circuit to operate according to a control method including: opening the bidirectional switch and closing the first voltage rail switch so that the output node is clamped at a voltage of the first voltage rail; causing the voltage at the output node to swing towards the voltage of the second voltage rail by opening the first voltage rail switch and closing the bidirectional switch so that a resonant circuit is established between the inductor and the load capacitance; opening the bidirectional switch and closing the second voltage rail switch so that the output node is clamped at a voltage of the second voltage rail; and causing the voltage at the output node to swing towards the voltage of the first voltage rail by opening the second voltage rail switch and closing the bidirectional switch so that a resonant circuit is established between the inductor and the load capacitance; and wherein the control unit is configured to change a frequency at which the switching voltage waveform switches between the voltage of the first voltage rail and the voltage of the second voltage rail.