Patent ID: 8753334

Claim:
An electrosurgical generator configured to provide high frequency electrosurgical energy at a fundamental frequency, the generator comprising: at least one circuit board having a board ground; an RF output stage coupled to the at least one circuit board configured to generate sinusoidal waveforms of high frequency electrosurgical energy for at least one electrosurgical mode; an alternating current line including a line contact, a neutral contact, and an earth ground contact; a DC power supply coupled to the board ground and to the alternating current line, the DC power supply configured to provide high voltage DC current to the RF output stage, the DC power supply having a capacitance and the alternating current line having a capacitance; and an inductor-capacitor filter connected in series between the board ground and the earth ground contact of the alternating current line, the inductor-capacitor filter including a capacitor connected in parallel with an inductor, wherein the inductor is tuned to resonate with the capacitor, the capacitance of the alternating current line, and the capacitance of the DC power supply at an operational frequency that is at or near a fundamental frequency of the high frequency electrosurgical energy.