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Ascend Single Phase Charger Operation Manual
7. OPERATION
7.1. System Functionality
Incoming AC power is converted to regulated DC output by a High Frequency bridge. The charger utilizes
a constant voltage and current control circuitry. Each module has a high-frequency isolation output
transformer for galvanic isolation to the DC loads. The system block diagram is shown below.
CB1
L1
AC Input
L2
G
When AC is turned on, the modules will automatically turn on to a predefined DC voltage. This will
power the display. The display will then command the modules to the correct DC voltage via the CAN
bus.
7.2. Charger Module
Each AC-DC power module contains Power Factor correction (PFC) circuitry to provide high power factor
and low input current distortion. A high frequency bridge is used to power an isolation transformer and
then rectified for a low ripple DC Output. EMI filtering is provided to minimize interference with other
connected devices.
AC IN
On the front of each module an LED indicator is provided for AC ON, DC On and Fault for quick
diagnostics of the module. The fault indicator will indicate a problem related to the module. The DC On
LED will flash if the module is in current limit.
7.2.1. Display Panel
The Charger Display Board interfaces with the Control Board and provides the user a mechanism to
monitor and control the operation of the charger via a touch screen color display. The Display board
communicates to the Module via a CAN bus voltage and current set points. The module will
communicate module status and alarms to the display.
95-100167, Rev A
Display Panel
Module 1
Module 2
Module X
Figure 23: Block Diagram
EMI
PFC
Figure 24: Module Block Diagram
34
Relay I/O
CB2
Fuse
+
DC Output
-
DC OUT
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