The GX7400 consists of a triple cPCI/PXI slot unit housing the bus interface, power conditioning and rectification circuitry and power conversion stages. The GX7400 utilizes chassis power for the bus interface and AC line power for all other needs. The figure below shows a block diagram of the GX7400.
GX7400 Block Diagram
The GX7400 Bus Interface, Control and Logic unit consists of PCI bus interface and power supply control logic.
The AC Power On signal is sent to the control section bus whenever the external AC line power switch is on. The control unit has an on-board EEPROM storing calibration data for each module. Each module is controlled by dedicated logic, which handles the A/D and D/A unit and control/protection of the module.
The 115/230V AC line voltage is converted to DC voltage by a power-conditioning unit. The power-conditioning unit accommodates up to two power modules. Power modules are completely isolated from each other, from the line input, and from the controlling logic, and communicate with the power supply control through a bi-directional serial link. Protection circuits protect against over-voltage, over-current, over-temperature and shorted output lines.
Available power modules are described in detail in Appendix B - Specifications.