High power battery powered RF amplifier topology
AssigneeEthicon, Inc.
InventorsDavid C. Yates, Gavin M. Monson
Life of this patent
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Abstract
In various embodiments, a control circuit for a radio frequency drive of an electrosurgical device is disclosed comprising a voltage data input configured to receive voltage data, a current data input configured to receive current data, and a switching signal output configured to source a switching signal. The control circuit is configured to adjust a frequency of the switching signal based on the voltage data and the current data. The radio frequency drive comprising a transformer comprising a first tap, a second tap, a third tap, a first portion of a primary coil, a second portion of the primary coil, and a secondary coil. Two of the first, second, and third taps are selected to drive the primary coil between the two selected taps.
Claims19
A control circuit for a radio frequency drive of an electrosurgical device, the control circuit comprising:
- a voltage data input configured to receive voltage data from a voltage sensing circuit;
- a current data input configured to receive current data from a current sensing circuit;
- and
- a switching signal output configured to source a switching signal to the radio frequency drive of the electrosurgical device,
- wherein the control circuit is configured to adjust a frequency of the switching signal based on the voltage data and the current data, and
- wherein the radio frequency drive comprising a transformer, wherein the transformer comprises:
- a first tap including a first half bridge driver;
- a second tap including a second half bridge driver;
- a third tap including a third half bridge driver;
- a first portion of a primary coil located between the first tap and the second tap;
- a second portion of the primary coil located between the second tap and the third tap;
- and
- a secondary coil, wherein the first, second, and third half bridge drivers are configured to selectively turn on or turn off the first, second, and third taps, respectively,
- wherein two of the first, second, and third taps are selected to drive the primary coil between the two selected taps, which allows the transformer to provide a plurality of winding ratio values, wherein a number of coil turns of the primary coil between the two selected taps and a number of coil turns of the secondary coil determine an overall winding ratio value of the transformer,
- wherein the overall winding ratio value is one of the plurality of winding ratio values provided by the transformer.
A method of controlling a radio frequency drive circuit of an electrosurgical device, the method comprising:
- sampling, by a synchronous I/Q sampling circuit, a plurality of output voltage values of an output voltage of the electrosurgical device;
- sampling, by the synchronous I/Q sampling circuit, a plurality of output current values of an output current of the electrosurgical device;
- and
- sourcing, by a square wave generation module, a switching signal to drive the radio frequency drive circuit,
- wherein the output voltage and the output current are sourced by the radio frequency drive circuit comprising a transformer, wherein the transformer further comprises:
- a first tap including a first half bridge driver;
- a second tap including a second half bridge driver;
- a third tap including a third half bridge driver;
- a first portion of a primary coil located between the first tap and the second tap;
- a second portion of the primary coil located between the second tap and the third tap;
- and
- a secondary coil, wherein the first, second, and third half bridge drivers are configured to selectively turn on or turn off the first, second, and third taps, respectively,
- wherein two of the first, second, and third taps are selected to drive the primary coil between the two selected taps, which allows the transformer to provide a plurality of winding ratio values, wherein a number of coil turns of the primary coil between the two selected taps and a number of coil turns of the secondary coil determine an overall winding ratio value of the transformer, wherein the overall winding ratio value is one of the plurality of winding ratio values provided by the transformer.
Dependencies are inferred from the claim text.