Circuit and method for reducing stored energy in an electrosurgical generator
First Claim
1. A circuit for discharging stored energy in an electrosurgical generator comprising:
- a pulse width modulator for controlling a high voltage power supply;
an error signal generating circuit configured for delivering an error signal as a difference between an output signal voltage with a feedback voltage generated by the high voltage power supply, the error signal being transmitted to the pulse width modulator; and
a switching circuit configured to switch in a load in parallel with an output of the high voltage power supply when the error signal is lesser than a first predetermined threshold to discharge the output.
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Accused Products
Abstract
A circuit for discharging stored energy in an electrosurgical generator is disclosed. The circuit includes a pulse width modulator for controlling a high voltage power supply, an error signal generating circuit configured for delivering an error signal as a difference between an output signal voltage with a feedback voltage generated by the high voltage power supply. The error signal is transmitted to the pulse width modulator. The circuit further includes a switching circuit configured to switch in a load in parallel with an output of the high voltage power supply when the error signal is lesser than a first predetermined threshold to discharge the output.
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Citations
26 Claims
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1. A circuit for discharging stored energy in an electrosurgical generator comprising:
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a pulse width modulator for controlling a high voltage power supply;
an error signal generating circuit configured for delivering an error signal as a difference between an output signal voltage with a feedback voltage generated by the high voltage power supply, the error signal being transmitted to the pulse width modulator; and
a switching circuit configured to switch in a load in parallel with an output of the high voltage power supply when the error signal is lesser than a first predetermined threshold to discharge the output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An electrosurgical generator comprising:
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a high voltage power source for generating direct current;
a radio frequency output stage for converting direct current into radio frequency energy; and
a circuit comprising;
a pulse width modulator for controlling a high voltage power supply;
an error signal generating circuit configured for delivering an error signal as a difference between an output signal voltage with a feedback voltage generated by the high voltage power supply, the error signal being transmitted to the pulse width modulator; and
a switching circuit configured to switch in a load in parallel with an output of the high voltage power supply when the error signal is lesser than a first predetermined threshold to discharge the output. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for discharging energy stored in a circuit in an electrosurgical generator, comprising the steps of:
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deriving an error signal as a difference between an output setpoint voltage with a feedback voltage generated by a high voltage power supply;
comparing the error signal with a first predetermined threshold;
switching on a load in parallel with an output of the high voltage power supply when the error signal is lesser than a first predetermined threshold to discharge the output; and
switching on a pulse width modulator if the error signal is above a second predetermined threshold. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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Specification