RF Board
Principles of Operation
LigaSure Vessel Sealing Generator Service Manual
5
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23
Redundant Sense Circuits
Redundant voltage and current sense circuits provide dosage error monitoring of
the delivered RF energy output.
The redundant sense circuits contain the following components:
Unit
Description/Function
T5
Current transformer - provides non-contact RF tank
current monitoring to establish a weighted redundant
measure of the RF output voltage
T3
Current transformer - provides non-contact redundant RF
output current monitoring
CR22,
CR23,
CR25,
CR26
Diodes - provide full wave bridge rectification of the signal
recovered from T5
R51
Resistor - provides a proportional measure of the rectified
signal of T5. R52 and C48 then low pass filter the R51
signal to develop the VR_SEN redundant voltage monitor.
CR12,
CR13,
CR15,
CR16
Diodes - provide full wave bridge rectification of the signal
recovered from T3
R46
Resistor - provides a proportional measure of the recitifed
signal of T3. R47 and C46 then low pass filter the R46
signal to develop the IR_SEN redundant current monitor.
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