![JENSEN Jensen NOS Aluminium foil [17/23] F f o o u u r r t t e e r r m m i i n n a a l l e e l l e e c c t t r r o o l l y y t t i i c c c c a a p p a a c c i i t t o o r r s s w w i i t t h h e e x x t t r r e e m m e e l l y y l l o o w w](/img/pdf.png)
JENSEN Jensen NOS Aluminium foil [17/23] F f o o u u r r t t e e r r m m i i n n a a l l e e l l e e c c t t r r o o l l y y t t i i c c c c a a p p a a c c i i t t o o r r s s w w i i t t h h e e x x t t r r e e m m e e l l y y l l o o w w
![JENSEN Jensen NOS Aluminium foil [17/23] F f o o u u r r t t e e r r m m i i n n a a l l e e l l e e c c t t r r o o l l y y t t i i c c c c a a p p a a c c i i t t o o r r s s w w i i t t h h e e x x t t r r e e m m e e l l y y l l o o w w](/views2/2010284/page17/bg11.png)
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L
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C
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S.
Application notes and FAQ
The short “life-story” of four pole
electrolytics
The four pole electrolytic capacitor came
first in the early 80's when Sprague
introduced a low inductance, low ESR four
pole axial capacitor mainly for switching
converters and regulators. As the switched
mode power supplies became common in
the mid-80's the demand increased for high
capacitance electrolytic capacitors having
improved high frequency inductance
characteristic. As these requirements could
be the most economical and elegant way
fulfilled by using four pole electrolytics
other firms - as i.e. FRAKO from Germany -
followed Sprague, and developed four pole
electrolytics.
Unfortunately most of designers of high
frequency switching mode circuits did not
care about elegancy, effectiveness and EMC
problems or they simply were not aware of
the existence of four pole electrolytics, they
used mostly cheap and bulky standard
components. As a consequence of these
facts the four pole electrolytics has sunken
into oblivion.
Reinvention now also for high-end
audio application
It was Tobias Jensen Production A/S (TJP)
that “reinvented” it for high-end audio
applications. Four pole electrolytics for
switched mode power supplies in maritime
communications systems has been
produced at TJP since 1990, thus
equipments that should last and work
reliable even under extreme circumstances
require the best design and components.
When TJP in the early 90’s started to
produce passive components in larger
extent for the high-end audio market and
became more and more conscious of the
need of audio enthusiasts and audiophiles,
came to the recognition that four pole
electrolytics are ideal reservoir capacitors
for power supplies (and not only for SMPS)
in sensible audio equipments.
The importance of attenuation and high
frequency behaviour
No matter how fast the amplifiers signal
processing circuits is, you cannot utilize
that speed if your power supply is too slow
to follow rapid signal changes.
The power supply's reservoir capacitor
constitutes a vital element in the amplifier
chain effecting the signals on the main
signal paths as well, because the most
power amplifiers reservoir is conceptually
placed in series with the loudspeaker line.
The main issue is not only that, the
capacitor can give you enough charge and
quickly enough, but the attenuation of the
power supply toward the amplifier. In spite
of the fact that the audio band is nominally
20-20 kHz, the stability of the amplifier and
the overall sound quality is strongly
influenced by reservoir capacitor behaviour
at very high frequencies.
The function of the reservoir capacitor is
not only to store energy, but also filtering,
providing decoupling between the power
supply and the amplifiers signal processing
circuits. For energy storage a
conventionally constructed aluminium
electrolytic capacitor with sufficient
Capacitance (F) x Voltage (V)/ Volume
(cm
3
) ratio and satisfactory low ESR and
inductivity at higher frequencies would be
suitable. However the capacitors filtering
characteristic plays a very important role in
decoupling and suppressing unwanted
transients and other i.e. digital high
frequency noises.
Содержание
- Air core inductors wound with metal foil and paper 4 pole electrolytic capacitors 1
- November 2000 1
- Speaker capacitors metal foil paper in oil or metallized pape 1
- Www jensencapacitors com 1
- Description metal foil paper in oil capacitor rev 3 date 22 8 000 approved jj 2
- Drawing no 101 12221 page 1 of 4 2
- Industrivej 4 dk 2605 broendby denmark phone 45 43271685 fax 45 43271699 2
- Metal foil paper in oil capacitors for high end audio applications 2
- Aluminium foil paper in oil capacitor selection 3
- Copper foil paper in oil capacitor selection 4
- Tin foil paper in oil capacitor selection working voltage 630 vdc 4
- Silver foil paper in oil capacitor selection working voltage 630 vdc 5
- Description speaker capacitors rev 1 date 29 5 0 approved jj 6
- Drawing no 101 12222 page 1 of 3 6
- Industrivej 4 dk 2605 broendby denmark phone 45 43271685 fax 45 43271699 6
- Metal foil mineral oil impregnated kraft paper axial performance speaker capacitor 6
- Speaker capacitors for loudspeaker crossover filters 6
- High purity copper foil and paper wound wax impregnated air core inductor for loudspeaker crossover networks 9
- Description air core inductor rev 4 date 18 5 000 approved jj 10
- Drawing no 103 11289 page 2 of 2 10
- Industrivej 4 dk 2605 broendby denmark phone 45 43271685 fax 45 43271699 10
- F f o o u u r r t t e e r r m m i i n n a a l l e e l l e e c c t t r r o o l l y y t t i i c c c c a a p p a a c c i i t t o o r r s s w w i i t t h h e e x x t t r r e e m m e e l l y y 12
- L l o o w w i i n n d d u u c c t t a a n n c c e e i i m m p p e e d d a a n n c c e e f f o o r r h h i i g g h h f f r r e e q q u u e e n n c c i i e e s s 12
- Data table for axial performance high ripple current version 13
- Data table for radial performance optimised c v ratio version 15
- The leakage current is measured at the input terminals after 5 minutes at 20 c and rated voltage 16
- F f o o u u r r t t e e r r m m i i n n a a l l e e l l e e c c t t r r o o l l y y t t i i c c c c a a p p a a c c i i t t o o r r s s w w i i t t h h e e x x t t r r e e m m e e l l y y l l o o w w 17
- I i n n d d u u c c t t a a n n c c e e i i m m p p e e d d a a n n c c e e f f o o r r h h i i g g h h f f r r e e q q u u e e n n c c i i e e s s 17
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