최소 단어 이상 선택하여야 합니다.
최대 10 단어까지만 선택 가능합니다.
다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
NTIS 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
DataON 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Edison 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0256374 (2005-10-21) |
등록번호 | US-8734438 (2014-05-27) |
발명자 / 주소 |
|
출원인 / 주소 |
|
인용정보 | 피인용 횟수 : 7 인용 특허 : 697 |
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 feed
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.
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 wi
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; anda 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. 2. A circuit as in claim 1, wherein the first predetermined threshold is 0.5V. 3. A circuit as in claim 1, wherein the pulse width modulator turns off if the error signal is below a second predetermined threshold. 4. A circuit as in claim 3, wherein the second predetermined threshold is 0.7V. 5. A circuit as in claim 1, further comprising: at least one diode for directing current from the high voltage power source. 6. A circuit as in claim 1, wherein the switching circuit comprises: a resistive element; anda switching component. 7. A circuit as in claim 6, wherein the switching component is a transistor. 8. A circuit as in claim 7, wherein the transistor is selected from the group consisting of a field-effect transistor (FET), a metal-oxide semiconductor field-effect transistor (MOSFET), and an insulated gate bipolar transistor (IGBT). 9. A circuit as in claim 6, wherein the resistive element has a resistance of 5 Ohms. 10. An electrosurgical generator comprising: 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; anda 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; anda 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. 11. An electrosurgical generator as in claim 10, wherein the first predetermined threshold is 0.5V. 12. An electrosurgical generator as in claim 10, wherein the pulse width modulator turns off if the error signal is below a second predetermined threshold. 13. An electrosurgical generator as in claim 12, wherein the second predetermined threshold is 0.7V. 14. An electrosurgical generator as in claim 10, wherein the active discharge circuit further comprises: at least one diode for directing current from the high voltage power source. 15. An electrosurgical generator as in claim 10, wherein the switching circuit comprises: a resistive element; anda switching component. 16. An electrosurgical generator as in claim 15, wherein the switching component is a transistor. 17. An electrosurgical generator as in claim 16, wherein the transistor is selected from the group consisting of a field-effect transistor (FET), a metal-oxide semiconductor field-effect transistor (MOSFET), and an insulated gate bipolar transistor (IGBT). 18. An electrosurgical generator as in claim 15, wherein the resistive element has a resistance of 5 Ohms. 19. A method for discharging energy stored in a circuit in an electrosurgical generator, comprising the steps of: 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; andswitching on the pulse width modulator if the error signal is above a second predetermined threshold. 20. A method as in claim 19, wherein the first predetermined threshold is 0.5V. 21. A method as in claim 19, wherein the second predetermined threshold is 0.7V. 22. A method as in claim 19, further comprising: at least one diode for directing current from the high voltage power source. 23. A method as in claim 19, wherein the switching circuit comprises: a resistive element; anda switching component. 24. A method as in claim 23, wherein the switching component is a transistor. 25. A method as in claim 24, wherein the transistor is selected from the group consisting of a field-effect transistor (FET), a metal-oxide semiconductor field-effect transistor (MOSFET), and an insulated gate bipolar transistor (IGBT). 26. A method as in claim 25, wherein the resistive element has a resistance of 5 Ohms.
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