IEEE Consumer Electronics Magazine - September 2018 - 52

Supercapacitor
Modules

Connection
Supplying Positive
Voltage from the
Supercapacitor
Module to the Buck
Converter Module

Connection Supplying
Negative Voltage from the
Supercapacitor Module to
the Buck Converter Module

Buck
Converter
Module
Ground Connection
for the Modules

0

10

-2

8

-4

6

-6
-8

4
5,694 s

2

-10

0
0

2,000

4,000 6,000
Time (s)
(a)

-12
8,000

10 V

A
Triangular Wave

Voltage (V)

12

Profile of Supercapacitor Module
Supplying Negative Voltage (V)

Profile of Supercapacitor Module
Supplying Positive Voltage (V)

FIGURE 3. The prototype of a supercapacitor-powered batteryless buck converter.

Ro equal to 7.6 Ω, Vo equal to 3.8 V.
Figure 4(a) shows the voltage profile of
the supercapacitor modules used in the
prototype where the blue curve is the
profile of the supercapacitor module
giving a positive voltage, and the green
curve is the profile of the supercapacitor
module giving a negative voltage. The
blue and green curves are mirror images of each other. This implies that the
buck module is drawing equal power
from both of the supercapacitor modules. Figure 4(b) includes the output
voltage of the prototype corresponding
to the decaying voltages of the supercapacitor modules, and the output voltage
takes a constant value until 5,694 s,
after which it exhibits a steep drop.
Figure 5(a) shows a blue triangular wave
sequence whose peak voltage is decaying over time and a green fixed-reference voltage. Figure 5(b) displays the
switching pulse generated by comparing

Reference Voltage of 3.8 V

B

O

4.5

5,694 s
Time (s)
(a)

7,091 s

20 V

5,694 s

3

Amplitude (V)

Output Voltage (V)

4
3.5
2.5
2
1.5
1
0.5
0

0

2,000

4,000 6,000
Time (s)
(b)

8,000

FIGURE 4. (a) The voltages of supercapacitor modules. (b) The
output voltage of the prototype.
52 IEEE Consumer Electronics Magazine

^

september 2018

O

5,694 s
Time (s)
(b)

FIGURE 5. (a) The triangular wave and fixed-reference voltage.
(b) An example of switching pulse.



Table of Contents for the Digital Edition of IEEE Consumer Electronics Magazine - September 2018

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