Theory of Operation
5-1
5. Theory of Operation
5.1 General
The AC source consists of 16 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. L, M boards contain input EMI filter, fuses and relays.
N board detects the input voltage to ensure it's in normal state. The system power is applied
by J board. 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 O 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 O 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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