Covidien SurgiStat, Service Manual

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4-2 SurgiStat Low-Power Electrosurgical Generator Service Manual
Block Diagram
Block Diagram
Functional block diagram of the SurgiStat system
Functional Overview of Key Circuits
The following descriptions highlight the main circuits.
Power Factor Correction Circuit (PFC)
The Power Factor Correction Circuit ensures lower power consumption. The circuit is used
to correct the power load that is distributed to the unit’s capacitors, providing the lowest
voltage required for proper operation of the unit. The PFC also regulates the universal
input of 100 to 240 volts that power the unit.
High-Voltage DC Supply
The generator incorporates a high-voltage power supply to generate the RF output power.
The high-voltage power supply delivers an unregulated DC output for the RF output. The
nominal DC voltage from the high voltage power supply is 80 VDC ± 5 V.
Low-Voltage DC Supplies
The generator incorporates six regulated low-voltage levels to control generator
operations. They are: 3.3 VDC, +5 VDC, +12 VDC, -12 VDC, 1.2 VDC, and -16 VDC.