RF Board
5-22 LigaSure Vessel Sealing Generator Service Manual
Primary Sense Circuits
The primary sense circuits provide generator output voltage and current
monitoring to the feedback microcontroller for all operative seal and bipolar
modes.
Precision absolute value processing circuits, which provide non-contact magnetic
coupling to the RF output, implement RF output sensing. Two factors maintain
high accuracy and precision:
• Op-amp compensation for non-linear diode elements
• Identical voltage and current sense topology.
The primary sense circuits contain the following components:
The circuits of U5 and U6 provide absolute value processing with a transfer gain
of one. This offers maximum stability and precision, and places the correlation of
developed RF output voltage and current on resistors R44 and R45.
V_SEN and I_SEN signals then go to the microcontroller to provide closed loop
feedback that the actual power delivered matches the requested power as
displayed on the front panel.
Unit Description/Function
T1 Current transformer - provides non-contact RF tank
current monitoring to establish a weighted measure of the
RF output voltage
T2 Current transformer - provides non-contact RF output
current monitoring
U5 Op-amp - provides absolute value circuit processing of the
signal recovered from R44, originating from T1
U6 Op-amp - provides absolute value circuit processing of the
signal recovered from R45, originating from T2
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