68805-M
ARC LAMP POWER SUPPLY
11
V. CIRCUIT DESCRIPTION
GENERAL
Please refer to schematic number 68805–3–1001 when reading this section. The schematic gives
a block diagram view of the major components of the power supply. The 68805 was designed
in a modular way for reliability and for maintenance, and the schematic reflects this component
approach to the power supply design.
The input mains is applied via J304, through the circuit breaker/power switch, and the line voltage
selector to T1. T1 steps down the input to a low voltage AC (24 volts nominal) which is then
connected to the coil of K1. The AC connection is not complete unless the interlock is made by
a jumper or a contact closure.
A complete connection at J301 will energize K1 and allow mains power to be applied to the main
power supply module (27–20–007). The power supply module will then begin to operate and
convert the AC mains voltage to a line isolated DC current. The power supply module is a
state–of–the–art, current mode, switching power supply which operates at 40kHz.
The meter board (68805–1210) continuously monitors the output of the power supply via J1. It
also provides the required voltage levels for the meter, and for the remote inputs and outputs via
J2 and J302.
DC power is then delivered to the load through the rear panel mounted connectors, J306
(po) and J307 (negative/-). Either of these connections may be ground referenced, if
needed, because these are line isolated outputs.
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