The ABC Questions of Super Capacitor

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The ABC questions of Super Capacitor
How super capacitances provide help for product?
Super capacitor has a very high power, and it is hardly to be influenced within its working scope.
When super capacitor is matching use with high energy, it can greatly improve the composite
system peak power.
How long is the service life of super capacitors?
Under the rated voltage and the temperature of 25℃, the super capacitor design life is for 10 years.
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Lowering voltage and temperature can extend design life, and increase the temperature and
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voltage will shorten the design life. Most applications use battery in the lower rated voltage, in
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order to extend the design life in high temperatures.
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How much is the super capacitance output voltage?
Super capacitor only provides energy in low voltage, and absorbs energy when the voltage up.
Output voltage depends on the charge state. Voltage upper/floor limit are used to determine the
working voltage range.
Super capacitor can offer much energy?
Super capacitor storing more energy than other traditional capacitance while is lower than the
battery. In order to determine the ideal capacitance stored energy, we can calculate by this formula:
E = 1/2 C x (Vupper2-Vlower2)
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How to charge for super capacitor?
Super capacitor strictly follows the current charging principle. N much current
MPO How on how much charge
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super capacitor unit, how much current it can absorb and voltage up depends
they accumulate. In the low charge
careful, because in voltage close to zero, their action is like a short circuit.
What are the principles to follow in capacitance series?
Most applications require series capacitance to reach higher working voltage. As for the series
capacitance, it had better reduce capacitance rated voltage, so as to reduce the influence of the
voltage unbalanced on the system life. Because of the series capacitance is the same, so with the
increase in the number of capacitance ESR increased; capacitance decreased with the increase in
the number of capacitor. (ESRTotal = ESRCell x capacitance number, CTotal = CCell/capacitance
number)
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What the principle of parallel capacitor?
If needed capacitance is bigger than the capacitance can be provided in size, it can put capacitance
in parallel. Different size capacitance can be in parallel, as long as each series unit uses similar
capacitance to meet capacitance and ESR requirements. For parallel the same kind of capacitance,
ESR decreased along with the increase in the number of capacitance while capacitance increased
with the number of capacitance increased. (ESRTotal = ESRCell/capacitance quantity, CTotal =
CCell x capacitance quantity)
What is the leakage current?
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Super capacitor has a small amount of self-discharge, namely the leakage current. If the materials
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and production process is different, the capacitor leakage current will differ slightly. As time goes
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on, because capacitance in the high charge state, a small leakage current changes will make
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voltage spread out. Leakage current lower capacitance voltage will rise, and leakage current
higher battery voltage can be decreased. Leakage current due to increased with the voltage, so in
all leakage current is equal, the voltage capacitance will gradually stop scattered. However, there
are enough disperse, thus when the series capacitance is under the rated voltage, it will lead to
high voltage capacitance prematurely degradation.
What is the battery equilibrium I need?
Battery equalization can be extended from resistor to the whole battery terminal, thus to consume
the current which is ten times of the rated battery leakage current on the complicated circuit which
used to transmit charge among batteries. Generally speaking, it is a good idea to realize battery
balance is needed for the application of a long battery life.
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Can we use super capacitor to replace battery XYZ?
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Usually it can't, but some low-power applications (such as generators and engine starts
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start) can use mixing capacitance to have power supply. Efficient
expand voltage range, so as to improve
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