RF Board
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LigaSure Vessel Sealing Generator Service Manual
Optoisolators
The isolated power supply voltages produced by the IsoBloc circuit connect to the
active output terminals of the generator. Handswitch activation results from
sensing macrobipolar or bipolar switch closure in a handheld accessory.
Comparators U14 and U15 turn on a function of accessory switch closure
determined by the operating bipolar mode:
•
U14 seal mode
•
U15 bipolar mode.
A switch closure provides a reverse polarity voltage to the comparator inputs.
This action drives the comparator outputs low, which turns on one of the
corresponding optoisolators, OPT 1 through OPT4. The optoisolator connects to
an input on the 82C55 expansion port in the main microcontroller circuit, pulling
the associated input low. The software interprets this action as an RF activation
request, and allows RF energy to be delivered.
Integration Functions
The RF board provides the key integration function for all assembly interconnects
internal to the LigaSure generator system. It also provides an output interface to
peripheral devices that either monitor RF activation or provide an external means
of calibrating the generator through a communication port.
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