LTC3300-1 Datasheet, PDF (14/44 Pages) Linear Technology – High Effciency Bidirectional Multicell Battery Balancer

LTC3300-1
OPERATION
I_CHARGE
C6 C5
C4
LTC3300-1
BALANCER ^C3
C2
SERIAL
COMMUNICATION
V^– C1
C6 C5
C4
LTC3300-1
BALANCER
C3
C2
CN
V^{– C1}
TOP OF STACK
+
CELL N
+
CELL N – 1
+ _{CELL N – 2}
+
CELL N – 3
+ _{CELL N – 4}
+ _{CELL N – 5}
+ _{CELL N – 6}
+ _{CELL N – 7}
+ _{CELL N – 8}
+ _{CELL N – 9}
+ _{CELL N – 10}
+ _{CELL N – 11}
CHARGER
V^–
V_CC
µP/µC
V_EE
SERIAL
COMMUNICATION
•
•
•
C6 C5
C4
LTC3300-1
BALANCER _C3
SERIAL
COMMUNICATION
C2
V^– C1
C6 C5
C4
LTC3300-1
BALANCER _C3
C2
V^{– C1}
•
•
•
+ _{CELL 12}
+ _{CELL 11}
+ _{CELL 10}
+ _{CELL 9}
+ _{CELL 8}
+ _{CELL 7}
+ _{CELL 6}
+ _{CELL 5}
+ _{CELL 4}
+ _{CELL 3}
+ _{CELL 2}
+ _{CELL 1}
SERIAL COMMUNICATION BUS
C11 C12
C10
C9
C8
C7
C6
LTC6803-1
MONITOR
C5
C4
C3
C2
C1 _V^–
I_LOAD
•
•
•
SERIAL
COMMUNICATION
C11 C12
C10
C9
C8
C7
LTC6803-1
C6 ^MONITOR
C5
C4
C3
C2
C1 _V^–
33001 F01
Figure 1. LTC3300-1/LTC6803-1 Typical Battery Management System (BMS)
There is no single balancing algorithm optimal for all
situations. For example, during net charging of the overall
stack, it may be desirable to discharge the highest voltage
cells first to avoid reaching terminal charge on any cell
before the entire stack is fully charged. Similarly, during
net discharging of the overall stack, it may be desirable
to charge the lowest voltage cells first to keep them from
reaching a critically low level. Other algorithms may
prioritize fastest time to overall balance. The LTC3300-1
implements no algorithm for balancing the stack. Instead it
provides maximum flexibility by imposing no limitation on
the algorithm implemented as all individual cell balancers
can operate simultaneously and bidirectionally.
33001f
14
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