Datex-Ohmeda D-VHC17, Техническое справочное руководство

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S/5 Anesthesia Monitor and S/5 Critical Care Monitor
8
Document No. 8001004-1
Figure 1 General block diagram, D-LCC10A/C (rev. 01)
2.2.1 LCD interface board
The LCD Interface board is the interface between the display controller board and the LCD display
component. The keyboard is also connected to the Interface board, see figure 1.
The incoming signal to LCD Interface board is pure analog VGA - RGB with separate horizontal and
vertical synchronisation signals, see figure 2. The display element uses digital RGB-signals,
HSYNC, VSYNC, DOTCLK and a display timing signal DTMG. The DTMG signal indicates that the
digital RGB-signals are active.
The functions of this board are digitalization of the video signals, regeneration of the DOTCLK and
generation of the DTMG. The backlight driver is also located on the board.
Power supply, D-LCC10A/C
The DC/DC power supply is an isolated discontinuous mode flyback switcher. It has a current
mode PWM circuit and a separate FET switch on the primary side. The transformer has two
secondary windings, one for 5V and another for 12V. On the secondary side (5V), there is a
separate chip on the feedback path to drive the optoisolator.