Cantec Systems CHFC-5-7-9 Manuale d'installazione e d'uso - Pagina 4

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Operating principle

The battery charger considerably affects battery life and performances, which is the main part of every
electric vehicle.
A non controlled traditional battery charger (rectifier) provides a simple direct AC/DC conversion.
i
AC
i
v
i
DC
In modern battery chargers these disadvantages are solved with an indirect AC/DC conversion, by
passing through an intermediate DC/DC conversion.
i
i
AC
v
i
DC
•
The main advantages of this solution are:
•
High efficiency
•
Reduced dimensions
•
Short charge times
•
Charge independent from the changes of the mains supply
Electronic control that provides the desired charge curve
The advent of electrical problems (due to commutation) has imposed the introduction of adequate filtering
to satisfy requirements of EMC 89/336/EEC directive for electromagnetic compatibility.

Block Diagram

F0
R
EMI
F1
S
FILTER
F2
T
E
Battery charger CHFC5-7-9
•
Disadvantages of this solution are:
•
Low efficiency
•
Large physical size
Batteria
•
Long charge times
Charge depends on changes in the mains supply (with
overcharge danger in the final charge phase)
DC
Batteria
DC
RECTIFIER
AND
FILTER
RECTIFIER
AND
FILTER
This is the usual method of operation for
the SMPS (Switching Mode Power
Supply) at high power. This solution
gives a good performance for minimum
costs and physical dimensions using
switches more faster and powerful
(modern technology).
POWER
RECTIFIER
STAGE
FILTER
CONTROL
LOGIC
EMI
AND
FILTER
F4
4