Theory of Operation
5-1
5. Theory of Operation
5.1 General
The AC source consists of 9 print circuit boards and other components. Each of the PCBs
has its specific function that will be described in the following subsection.
5.2 Description of Overall System
Figure 5-1 shows the overall system. Main power flows through the A/D, D/D, D/A power
stage converter. The A/D power stage is designated as I board, and generates DC voltage
from the line input. The DC voltage of A/D output is applied to the D/D power stage. The G
board of D/D stage takes power from the A/D output. It generates two isolated DC outputs
for D/A power stage. The H board of D/A inverter generates AC output through full bridge
controlled by B board. The D/A power stage is through G board relays in parallel or series
control to obtain more current and higher voltage.
B board is identified as DSP processor and D/A controller. The DSP processor is applied to
control output frequency and voltage, to measure voltage and current through G board, to
perform remote control through GPIB, RS-232C or EXT Vref interface on Optional E board, to
respond TTL signals through D board. A board is identified as user interface controller. It
scans front panel keys through K board, and sends settings and measurement messages on
LCD module.
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