Speaker coil
Balancing
Dual-cell
5 V
Boost
converter
3.6 V
Q1
Q2
Q3
Q4
resistors
supercapacitor
324
Electrochemical Supercapacitors for Energy Storage and Delivery
FIGURE 8.4
A 0.55 F 85 mΩ dual-cell ES delivers 5 W power bursts to drive peak power functions such
as audio and LED flash. A battery covers a phone’s average audio power needs of 0.5 to 1 W,
recharging the ES between bursts.
using surface mount components, the entire package was kept to the size of a
D-cell battery. The package was able to maintain a constant voltage for more
than a minute with a 100 Ω load.
Compared to conversional capacitors for portable devices, ESs can overcome the power delivery constraints of batteries and the energy delivery
limitations of conventional capacitors. They handle peak power events for
wireless transmission, GPS, audio, LED flash, video, and battery hot swaps,
and then are recharged from a battery at an average power rate.
For example, a typical cell phone design features a standard 3.6 V battery
powering two Class D amplifiers to drive a pair of 8 Ω speakers. This typical
design delivers a peak power of only 2.25 W, suggesting that it can power
only thin-sounding music with a weak bass beat. Standard camera phones
struggle to generate enough flash power to produce clear pictures in low
light. High-current LEDs need up to 400% more power than a battery can
provide to achieve full light intensity. An online report by Mars [9] showed
that they were able to overcome power delivery limitations and boost flash
and audio performances of portable devices using an ES. Figure 8.4 shows
how a 0.55 F, 85 mΩ dual-cell ES can deliver 5 W power bursts to drive peakpower functions such as audio and LED flash.
8.6 Power Quality Improvement
An electrical power quality problem is defined as deviation and fluctuation
of voltage that results in damage or mis-operation of electronic equipment or
Balancing
Dual-cell
5 V
Boost
converter
3.6 V
Q1
Q2
Q3
Q4
resistors
supercapacitor
324
Electrochemical Supercapacitors for Energy Storage and Delivery
FIGURE 8.4
A 0.55 F 85 mΩ dual-cell ES delivers 5 W power bursts to drive peak power functions such
as audio and LED flash. A battery covers a phone’s average audio power needs of 0.5 to 1 W,
recharging the ES between bursts.
using surface mount components, the entire package was kept to the size of a
D-cell battery. The package was able to maintain a constant voltage for more
than a minute with a 100 Ω load.
Compared to conversional capacitors for portable devices, ESs can overcome the power delivery constraints of batteries and the energy delivery
limitations of conventional capacitors. They handle peak power events for
wireless transmission, GPS, audio, LED flash, video, and battery hot swaps,
and then are recharged from a battery at an average power rate.
For example, a typical cell phone design features a standard 3.6 V battery
powering two Class D amplifiers to drive a pair of 8 Ω speakers. This typical
design delivers a peak power of only 2.25 W, suggesting that it can power
only thin-sounding music with a weak bass beat. Standard camera phones
struggle to generate enough flash power to produce clear pictures in low
light. High-current LEDs need up to 400% more power than a battery can
provide to achieve full light intensity. An online report by Mars [9] showed
that they were able to overcome power delivery limitations and boost flash
and audio performances of portable devices using an ES. Figure 8.4 shows
how a 0.55 F, 85 mΩ dual-cell ES can deliver 5 W power bursts to drive peakpower functions such as audio and LED flash.
8.6 Power Quality Improvement
An electrical power quality problem is defined as deviation and fluctuation
of voltage that results in damage or mis-operation of electronic equipment or