High Voltage Power Supply (Hvps); Figure 3.1 Rf Controller Block Diagram - ConMed SYSTEM 5000 Service Manual

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Operator's manual (38 pages)

Table Of Contents

Table of Contents

Power

setting –

watts

displayed

on the front

panel

Voltage

sampled

450,000

times per

second

Current

sampled

450,000

times per

second

to optimize the electrosurgical output waveform.

Finally, the RF Controller minimizes RF leakage

currents using the CONMED Leakage Abatement

System (CLAS™), which imposes a duty cycle on

the electrosurgical output when sensed impedance

and output voltage exceed settings-based imped-

ance thresholds and voltage limits in the Coag

modes.

The RF Monitor is also a DSP , but it is used to

monitor the system for a variety of conditions that

could lead to safety problems, including:

• The Monitor has independent sensors for out-

put voltage and current, which it uses to cal-

culate power for comparison with the power

that the RF Controller senses and for com-

parison with the generator power setting.

• To ensure that the correct outputs are acti-

vated, the Monitor also independently

senses current at each of the outputs, look-

ing for current flow that would indicate

electrosurgical power at outputs other than

the selected output.

• The Monitor senses the voltage at the output

of the HVPS to ensure that it is reasonable

for the power setting.

• The Monitor senses the audio output to ensure

that a tone occurs whenever electrosurgical

outputs are active.

• The RF Amplifier drive signal is sensed by

the Monitor to detect improper frequencies

or improper pulse sequences for the selected

mode.

200

180

160

140

180

120

100

500

1000

1500

2000

Calculate

measured

resistance

Measured

Calculate

Power

measured

power

Figure 3.1 RF Controller Block Diagram

Desired

Power

Adjust

output

Compare

waveform

(power)

• The Monitor independently compares the

activation signal with that seen by the System

Controller to ensure that the activation signal

is consistent.

The Monitor has the capability to independently

disable the electrosurgical output if a problem is

detected.

The System Controller provides the primary con-

trol interface to the user and other outside sys-

tems, including the serial interface, the activation

relay, tone generation, and displays.

Finally, the Display accepts all user input and pro-

vides all user feedback. The Display is controlled

by the System Controller through a serial interface

and illuminates the LED display elements in a

time division multiplexed fashion; the illuminated

LED display elements are actually on less than half

the time. The Display also provides for user input

through the buttons on the control panel, includ-

ing switch de-bouncing and conditioning.

Figure 3.2 illustrates the key elements of the sys-

tem in block diagram form.

3.2.1