DESIGN & PRODUCTS POWER SUPPLIES & BATTERIES
ture. Infineon and Spark Connected are driving this next generation
wireless charging standard with key OEM market makers in
this space as part of the Wireless Power Consortium.
Fig 6: High peak
efficiency (95%
tested) of the 45W
laptop transmitter
and receiver
solution.
At 80W, “The Ogre” is a high-power inductive wireless charging
solution that provides high efficiency charging on compact
coils without special thermal management. Typical applications
are power tools, robots, small appliances, drones, handheld terminals,
medical instruments and industrial automation. Further
reference designs will be available on demand.
Whats coming next
As wireless power becomes more integral to our mobile and
connected lives, Infineon and Spark Connected continue to
drive next generation technologies and standards that allow
readily available charging without the limitation of wires. What
started out with phones will quickly be taken over by applications
such as tablets, laptops, handheld gaming, medical
devices, automotive, infrastructure and industry 4.0. Given the
breadth and different types of wireless power technologies in
their arsenal, Infineon and Spark Connected are in a strong
position to provide the solutions that allow users to cut that last
cord.
In the future, some applications will require very high-power
levels or higher frequencies for specific user charging experiences.
These applications will benefit from solutions that have
improved power/performance capability, such as GaN. In many
of these situations, efficiency is the critical metric, and GaN
e-mode HEMTs provide a high-power charging solution with a
manageable thermal impact. Because of its better high frequency
performance, GaN also provides an optimal solution for class
E amplifiers in resonant wireless charging.
First monolithic GaN FET and driver chip
The ePower Stage from Efficient Power Conversion
(EPC) is the first integrated GaN FET and driver chip for
48V DC-DC conversion, motor drive, and Class-D audio.
EPC has launched an 80V, 12.5A power stage chip that
combines a driver and gallium nitride GaN FET for 48 V DC-DC
conversion used in high-density computing applications and in
motor drives for e-mobility. The EPC2152 is a single-chip driver
plus eGaN FET half-bridge power stage built with EPC’s proprietary
GaN technology. Input logic interface, level shifting, bootstrap
charging and gate drive buffer circuits along with eGaN
output FETs configured as a half-bridge are
integrated within a monolithic chip. This
results in a chip-scale LGA form factor device
that measures 3.9x2.6x0.63mm. When
operated in a 48 V to 12 V buck converter
at 1 MHz switching frequency, the EPC2152 ePower Stage
achieves a peak efficiency above 96 per cent with a solution
that is 33% smaller in size on the printed circuit board (PCB)
compared to an equivalent multi-chip discrete implementation.
Efficient Power Conversion (EPC)
www.epc-co.com
750V GaN swiches target 55W
power delivery designs
The INN3x78C from Power Integrations uses a
smaller “size 8” 750V GaN transistor for power
supplies delivering between 27W and 55W without
heatsinks. Power Integrations has extended its InnoSwitch3
families of gallium nitride offline constant
voltage/cnstance current CV/CC flyback switches
with lower power versions. The INN3x78C uses a smaller
“size 8” 750 V PowiGaN transistor, enabling compact, efficient
power supplies delivering between 27W and 55W without
heatsinks. The ICs are housed in the same high-creepage,
safety-compliant InSOP-24D package as larger
members of the GaN-based InnoSwitch3 families,
which target up to 120W. The PowiGaN transistors
have up to 94 percent efficient across line and load
and are robust against line surges and swells commonly
seen in regions with unstable mains voltage.
This enables OEMs to specify a single power supply
design to be used worldwide.
Power Integrations
www.power.com
15W and 20W DIN rail supplies
for industrial and IT designs
The DTJ15 and DTJ20 series of DC-DC
converters from XP Power can be DIN rail or
chassis mounted to provide 15W and 20W
in rugged industrial designs. The flexible
specification allows devices with incompatible
voltages to be easily integrated into such designs. The DTJ15
and DTJ20 series can be installed to a chassis or DIN rail
and connected via screw terminals and require no additional
components for protection or EMC compliance. A key feature
of the DIN rail DC-DC converters is the 4:1 input range
covering 9VDC to 36VDC and 18VDC to 75VDC. This supports
a variety of input sources including multiple nominal
battery voltages and vehicle supplies. Both series have 14
variants with single-output (3.3V, 5.0V, 12.0V & 15.0V) and
dual output (±5.0V, ±12.0V & ±15.0V) options in both input
ranges. The single output types allow the output voltage
to be trimmed by ±10% to accommodate voltage drops in
cabling when the load is located remotely.
XP Power
www.xppower.com
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