4-4 CHP Max™ Headend Optics Platform Chassis, Controllers and Power Supplies Rev D
Functional Description
Figure 4.3
AC Power Supply
Block Diagram
IEC Connector
A standard IEC connector accepts AC input.
Fuse
This fuse limits the current used by the Power Supply module if a short circuit occurs inside
the module and prevents the loss of AC power to other connected devices. The fuse is not
user-serviceable.
Input Filter
The filter reduces electromagnetic interference conducted from within the Power Supply
module to the AC input.
Power Factor Correction Circuitry
This circuit helps reduce input current consumption and improves (lowers) input harmonics.
Power Conversion Circuitry
Power conversion circuitry produces the four isolated output voltages (+12.0 VDC @ 10A,
+5.0 VDC @ 22A, +3.5 VDC @ 2.2A, and –5.0 VDC @ 1.8A) required by chassis modules.
Filters
Each voltage from the power conversion circuity passes through an independent filter that
reduces ripple noise near the switching frequency.
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