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 having an output;
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;
a switchable load connected in parallel with the output of the high voltage power supply; and
a switching circuit configured to switch in the switchable load in parallel with the output of the high voltage power supply when the error signal is transmitted to the switching circuit and is less 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. 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 having an output; 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; a switchable load connected in parallel with the output of the high voltage power supply; and a switching circuit configured to switch in the switchable load in parallel with the output of the high voltage power supply when the error signal is transmitted to the switching circuit and is less 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 having an output; 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; a switchable load connected in parallel with the output of the high voltage power supply; and a switching circuit configured to switch in the switchable load in parallel with the output of the high voltage power supply when the error signal is transmitted to the switching circuit and is less 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; transmitting the error signal to each of a switching circuit configured to switch in a switchable load and a pulse width modulator for controlling the high voltage power supply; switching in the switchable load in parallel with an output of the high voltage power supply when the error signal is less than a first predetermined threshold to discharge the output; and switching on the 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