Fps Theory Of Operation - ferrotec Temescal CV-6SLX User Manual

4.3 FPS Theory of Operation

HV Output Board
The HV Output board provides secondary-tuning capacitance, HV rectification, and voltage and
current feedback to the Regulator board. High frequency AC voltage driven on the primary of
the HV transformer by the Inverter is transformed by a fixed ratio (15:225) and connected to
the input of the HV Output board at J1 and J2.
Regulator Board
The Regulator board performs virtually all logic, control, and analog processing functions.
However, its primary function is output voltage control. The board performs this function by
comparing the output feedback to the references provided and then feeding the Inverter board's
IGBT gate drives to properly actuate them. DC output voltage is delivered from the Regulator
board to the external load through the custom high-voltage "cablewell" connector J1 on the
unit's rear panel. A mating connector and cable for J1 are provided with each power supply.
Interface Board
The Interface board is mounted to the upper left-hand corner of the rear panel. Three D-
subminiature connectors on the Interface board connect the remote I/O signals to the Regulator
board. J1, a 14-pin D-sub connector (labeled J5 on rear panel), provides the interface to the
filament power supply. J2, a 37-pin D-sub connector (labeled J3 on rear panel), provides
diagnostic signals to the user's system. Appendix B provides a pinout table for these signals. J3,
a 24-pin D-sub connector (labeled J4 on rear panel), serves as the active control interface for
user-supplied I/O signals.
Interface board connector J4 routes all signals on the Interface board to the Regulator board.
Since the location of the unit's top cover interlock switch (which opens its contacts when the top
cover has been removed) is adjacent to the Interface PCB, board connector J5 provides the
shortest path for the switch's contacts to the interlock circuitry on the Regulator board.
Display and Control Board
The Display and Control board is sandwiched between the front panel and the Regulator board.
The Display and Control board houses and handles signals to/from an HV OFF pushbutton, an
output voltage adjustment potentiometer, voltage and current LCD displays, and the unit's front
panel LEDs.
4.3 FPS Theory of Operation
4.3.1 Overview of FPS Operation
The filament power supply module (see Figure 4-3) provides emission current control and
measurement, filament power and control, and high-voltage switching. The filament circuit
utilizes high-frequency switch mode technology similar to that of the high-voltage circuit. The
filament circuit requires single-phase power of approximately 208–230 V.
CV-6SLX User Manual 4-4
Section 4: Theory of Operation
0101-8242-0, Rev. C