Abstract:
The characteristics of Lithium Ion Capacitor
(below , abbreviated as LIC) as a charging
device is similar to Lithium Ion Battery and
has quite long life, it is 100 times more than
Lithium Ion Battery charge and discharge
cycles. But it has one tenth of capacity of Lithium
Ion Battery. For that reason, increasing the
energy availability is important for LIC system. In
this paper, in order to increase efficiency of
discharge, effectiveness of voltage equalization
method of LIC was checked and
correctness of firmware design, circuit design
and PCB design as an embedded system was
confirmed.
The method is in a sense simple that is
repeatedly switching the parallel connection
of the capacitors and serial connection of them.
The reputation cycle of this system is 1 kHz to 50 kHz
for experimental purpose. The implement
of this method for seven to eight LICs is shown
in this paper. This system is implemented
as a DC output UPS. Because the LIC block
is easy to generate switching noise and
switching loss, it is difficult to measure the
characteristics and property other than
realizing UPS unit as an embedded system including
software and hardware (mainly circuit and PCB)
design.
In this embedded system, The Cypress PSOC
microcontroller is adopted to get flexibility and to
control many Power MOS FETs for switches and the
circuit is implemented by four layer PCB.
