Technical Report No. 89
Unconventional BG-WK POWER TANK is born: suppresses noise completely!
(BG-WK POWER TANK/Part 1)
Remove an unavoidable self-interference
occurred in a common power supply handles pulse: The most important process
for your set!
A lot kind of electronic
equipment which handles with pulse such as a television has a cathode ray
tube imaging display device inside.
Without exception, it has
a horizontal fly back circuit for an electron-beam deflection of fairly
large voltage. In fact, this is the biggest source of noise generation.
The noise invades other
numerous circuits connected with a same power supply directly, and self
interference occurs inside because the noise is unexpectedly larger than
that of coming from outside.
a harmful effect on picture quality especially for color reproducing circuit
While horizontal output
pulse flies back, a large ringing power including odd numbers harmonics
generates. (See Figure 1)
This is the cause of noise
generation, and the ringing power goes through a power supply and hits
other circuits directly.
It damages Y signals enormously
that deciding the picture quality, and also deteriorates the color signals
of I and Q and the operation of a phase detecting circuit particularly.
A conventional electrolytic
capacitor for smoothing noise is polarized, so it can smooth noise in only
one direction. The opposite direction is left uncontrolled, and makes
the performance of other circuits connected with the same power supply
Then, to replace such a
capacitor with non-polarized Black Gate, the noise has vanished completely
and picture quality has improved drastically because BG can work in the
both directions. Now, Black Gate has got much attention for the perfect
non-polarized operation of wide voltage range by even a single piece.
new brand BG-WK, the revolutionary structure
This Black Gate looks
like a polarized electrolytic capacitor in appearance, yet it is entirely
different. The inside is asymmetrical and non-polarized structure which
has two different working voltages: the +pole is 200V and the -pole is
This is unconventional as
well as the most reasonable structure because when a pulse voltage at its
peak 100V adds to the ringing power that superposes on a driving DC voltage
of around 130V that is rectified by 100V power supply can be smoothed and
bypassed as no distortion, low loss, and ultra high speed. (See Figure
At last, Jelmax has completed
a state-of-the-art BG-WK 200V 220uF: high performance and very efficient
capacitor for various characteristics in the same size as a conventional
Ordinarily, a ringing noise
superposed on a conventional smoothing capacitor is all under 100V, therefore
BG-WK can eliminate the noise completely.
This is certainly the indispensable
weapon against self-interference which HDTV has to face in the near future.
We are going to explain why is the capacitor a power tank type in the next
issue for a switching power supply.
power increases a lost and the life becomes longer by several times
In a conventional capacitor,
the reverse pulse is directly absorbed inside and becomes loss power that
would make the temperature of electrolyte rises.
It dries up faster and the
life of the capacitor becomes shorter. TV monitors, image receiving devices
and PCs, all of them which are very frequently used suffer much for this.
On the other hand, the inner
loss of BG-WK is the only E.S.R. due to a non-polarized structure, so the
temperature rises just a little.
The electrolyte inside is
consumed as less as 1/100 compared to conventional ones. Therefore the
power has increased and the life has become as much as 3 to 5 times longer!
We believe that these are
wonderful new for TV stations that have to spend a lot of money to maintain
VDT, for companies using OA, and medical institutions using high class
Figure 1:Horizontal Output Pulse Waveform
Figure 2: Horizontal Output Circuit for