ALC10C331ED450 BHC COMPONENTS, ALC10C331ED450 Datasheet - Page 12

• Manufacturer Part Number: ALC10C331ED450
• Description: CAPACITOR, 330UF 450V CAPACITOR, 330UF 450V
• Manufacturer: BHC COMPONENTS
• Series: ALC10r

Specifications of ALC10C331ED450

• Capacitance: 330UF
• Voltage Rating, Dc: 450V
• Capacitor Dielectric Type: ALUMINIUM ELECTROLYTIC
• Temp, Op. Max: 85(DEGREE C)
• Temp, Op. Min: -40(DEGREE C)
• Tolerance,: 20%
• Rohs Compliant: YES

10
Change in Electrical Characteristics
Various electrical parameters will alter with frequency, temperature and voltage as shown:
APPLICATION AND OPERATION
Aluminium electrolytic capacitors are used in a wide variety
of applications including; power supplies, inverters for
variable speed drives and uninterruptible power supplies,
energy discharge (for medical and photoflash applications)
and motor starting. Their advantages over other capacitors
are:
 high capacitance per unit volume
 high ripple current capability
For optimum performance of this type of capacitor the
following points should be considered:
Parallel and Series Operation
Special considerations arise when electrolytic capacitors are
used in series or parallel banks.
In series operation, matching of capacitance values may
be necessary to avoid imbalance during charging and
discharging mode. Steps must be taken to ensure adequate
d.c. voltage distribution while biased, either by providing
shunt resistors to compensate for inequalities in capacitor
d.c. leakage currents, or some other means.
There are two major configurations to consider when
constructing a series/parallel bank of capacitors - individual
balancing resistors and common centre connection.
Individual balancing resistors afford greater protection for
the capacitors if one becomes short circuit but is more
complex to construct and expensive. Common centre
connections give improved balancing during steady state and
Capacitance
ESR
Impedance
(below resonance)
Impedance
(above resonance)
DC leakage
Temperature
increase
Frequency
increase
–
transient conditions but offer the possibility of exposing one
half of the bank to full voltage should one capacitor short
circuit.
Full details on the selection and use of shunt resistors
can be found in a technical article, TD001, in “Aluminium
Electrolytic Capacitors - Application Notes”, available
from BHC.
In parallel operation, particularly large, high voltage banks,
the possibility of capacitors discharging into each other may
entail special precautions in certain applications.
Series/Parallel Bank Protection
There are three major configurations to consider in
protecting a series/parallel bank of capacitors. The
advantages and disadvantages of each are outlined below
but the final choice must be made by the equipment
designer.
OPTION 1 - Fusing for whole bank
increase
Voltage
–
–
–
–
Electrical Characteristics
Application & Operation
under voltage
Time
–
–
–
–