CPWR-AN26, Rev A, 08-2018
Copyright © 2018 Cree, Inc. All rights reserved.
The information in this document is subject to change without notice.
Cree and Zero Recovery are registered trademarks, and the Cree logo and C3M are trademarks, of Cree, Inc
Cree’s CRD
-06600FF10N, 6.6KW Bi-Directional EV On-board charger (OBC) is designed to operate
from universal single-phase input and provide an output voltage in the range of 250 VDC to
450 VDC. The front-end AC/DC PFC (Power Factor Correction) stage consists of a Totem-Pole Bi-
Directional topology followed by a Bi-Directional Isolated DC/DC stage which uses a symmetric
CLLC converter. The input and output sides of the Bi-Directional Isolated DC/DC stage carry H
bridge topologies. Input is isolated from the output through a high frequency transformer. Even
though this board is designed for electric vehicle (EV) application, there is no battery charging
algorithm built in and the board must be tested on resistive load only. Output current is limited
to 20A at 250VDC output. AC/DC PFC stage runs at a fixed frequency of 67 kHz and DC/DC CLLC
stage runs at fixed frequency close to 200 kHz. The output voltage is regulated by varying DC link
voltage, which is an open loop control. Output voltage can be set by a potentiometer provided
on the control board. A block diagram of
Cree’s CRD
-06600FF10N, 6.6KW Bi-Directional EV On-
board charger is shown in Figure 1.
Figure 1. Block Diagram of
Cree’s CRD
-06600FF10N, 6.6KW Bi-Directional EV On-board charger
G4
Ls
EMI FILTER
Vs
is
Cdc
V
_d
cl
ink
G6
G8
G10
G12
Co
V
_b
at
Lrp
Crp
Lrs
Crs
Tr
G3
G2
G1
G5
G7
G9
G11
+
_
GRID
BATTERY
ict
ibat
TMS320F28377DPTPT
ADCs
SIGNAL CONDITIONING
WITH ISOLATION
MOSFET GATE DRIVERS
WITH ISOLATION
PWMs
G1
G2
G3
G4
G5
G6
G7
G8
G9
G10
G1
1
G12
Vs
is
v_dcl
ink
ict
ib
at
v_bat
BIDIRECTIONAL AC-DC CONVERTER
BIDIRECTIONAL ISOLATED DC-DC CONVERTER
ISOLATED
DC-DC
CONVERTERs
+
LINEAR
REGULATORs
CONTROL SUPPLY
And GATE
DRIVER SUPPLY
GENERATION
EXTERNAL
CONTROL
SUPPLY
15V
GATE
DRIVER
SUPPLY
CONTROLLER
SUPPLY
