摘要 :
Two-Stage Architecture; Integration of Power Stage Pathway to High Performance VR; Adoption in Laptop enables fsw increasing from 300kHz to 800kHz; Enable140MHz 2nd stage FIVR with 80MHz bandwidth; Non-wirebond DrMOS enable high e...
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Two-Stage Architecture; Integration of Power Stage Pathway to High Performance VR; Adoption in Laptop enables fsw increasing from 300kHz to 800kHz; Enable140MHz 2nd stage FIVR with 80MHz bandwidth; Non-wirebond DrMOS enable high efficiency MHz VR; 3D integration with lateral flux inductor enable >1000W/in~3 power density; COT is superior to PCM control due to fast transient response; Adaptive COT with hybrid Interleaving is a promising high bandwidth control for eliminating bulk cap.
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摘要 :
A novel two stage system architecture and control are proposed. 300kHz switching frequency for AC/DC and 500kHz for DC/DC. ZVS is achieved for all high frequency devices. PCB winding magnetic components with much reduced EMI noise...
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A novel two stage system architecture and control are proposed. 300kHz switching frequency for AC/DC and 500kHz for DC/DC. ZVS is achieved for all high frequency devices. PCB winding magnetic components with much reduced EMI noise. 96.2% total system efficiency and 37W/in~3 Power density.
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摘要 :
A high efficiency and high power density sigma
converter for 48/1V voltage regulator module (VRM) is proposed
in this paper. The Sigma converter is a quasi-parallel converter
that uses a high efficiency unregulated converter to...
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A high efficiency and high power density sigma
converter for 48/1V voltage regulator module (VRM) is proposed
in this paper. The Sigma converter is a quasi-parallel converter
that uses a high efficiency unregulated converter to deliver most
power to the load with small power flowing through buck
converter responsible for regulating the output voltage. The
unregulated isolated converter is LLC converter designed with
matrix transformer structure integrating 4 transformers in one
core structure with integrating the Synchronous Rectifiers (SRs)
with the winding to minimize the termination losses of the
transformer so a high efficiency can be achieved. The buck
converter is designed with discrete GaN devices and PCB winding
inductor to regulate the output voltage. The designed Sigma
converter is 48/1V-80A achieving a power density of 420W/in3 and
maximum efficiency of 93.4%.
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摘要 :
A wide-band-gap based bidirectional onboard charger (OBC) has been proposed with a variable DC-link voltage, which tracks the battery voltage fluctuation. Although this approach is deemed most efficient for the resonant DC/DC stag...
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A wide-band-gap based bidirectional onboard charger (OBC) has been proposed with a variable DC-link voltage, which tracks the battery voltage fluctuation. Although this approach is deemed most efficient for the resonant DC/DC stage, it posts significant challenges for the rectifier/inverter stage which operates in the critical mode (CRM) to realize ZVS, while subjecting to the large variations of input and output voltages. Design considerations of the AC/DC stage are presented in this paper, including the evaluation of1.2 kV SiC MOSFETs; the zero-voltage-switching (ZVS) extension techniques to realize ZVS under all input/output variations; a novel universal control strategy for both the rectifier mode and the inverter mode. A prototype is built which achieves 98.5% efficiency at a switching frequency higher than 300 kHz. Furthermore, a 6.6 kW OBC system is demonstrated, using both SiC and GaN devices with 43 W/in3 power density and above 96% efficiency.
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摘要 :
Omnidirectional wireless power transfer (WPT)
system has been studied recently due to its better user
experience compared with directional WPT system in consumer
electronics application. The efficiency of power transmission is
rel...
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Omnidirectional wireless power transfer (WPT)
system has been studied recently due to its better user
experience compared with directional WPT system in consumer
electronics application. The efficiency of power transmission is
related to magnetic coupling condition and coil quality factor. In
this paper, design of transmitter coil geometry with respect to
high coupling condition over misalignment and high coil quality
factor is investigated in detail. Besides, LCCL-LC resonant
converter is promising topology for WPT application due to
coupling and load independent resonant frequency. The
parameter design of resonant tank of LCCL-LC resonant
converter is focused to achieve three objectives: I. Operating at
resonant frequency II. Satisfying output voltage requirement,
III. Zero voltage switching (ZVS) turn on. Finally, 6.78MHz
omnidirectional WPT system is built and 75~85% (mostly
80%+) system efficiency at 5W output is achieved for smart
phone size receiver with free positioning in the setup.
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摘要 :
Omnidirectional wireless power transfer (WPT)
system has been studied recently due to its better user
experience compared with directional WPT system in consumer
electronics application. The efficiency of power transmission is
...
展开
Omnidirectional wireless power transfer (WPT)
system has been studied recently due to its better user
experience compared with directional WPT system in consumer
electronics application. The efficiency of power transmission is
related to magnetic coupling condition and coil quality factor. In
this paper, design of transmitter coil geometry with respect to
high coupling condition over misalignment and high coil quality
factor is investigated in detail. Besides, LCCL-LC resonant
converter is promising topology for WPT application due to
coupling and load independent resonant frequency. The
parameter design of resonant tank of LCCL-LC resonant
converter is focused to achieve three objectives: I. Operating at
resonant frequency II. Satisfying output voltage requirement,
III. Zero voltage switching (ZVS) turn on. Finally, 6.78MHz
omnidirectional WPT system is built and 75~85% (mostly
80%+) system efficiency at 5W output is achieved for smart
phone size receiver with free positioning in the setup.
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摘要 :
Omnidirectional wireless power transfer (WPT)
system has been studied recently due to its better user
experience compared with directional WPT system in consumer
electronics application. The efficiency of power transmission is
rel...
展开
Omnidirectional wireless power transfer (WPT)
system has been studied recently due to its better user
experience compared with directional WPT system in consumer
electronics application. The efficiency of power transmission is
related to magnetic coupling condition and coil quality factor. In
this paper, design of transmitter coil geometry with respect to
high coupling condition over misalignment and high coil quality
factor is investigated in detail. Besides, LCCL-LC resonant
converter is promising topology for WPT application due to
coupling and load independent resonant frequency. The
parameter design of resonant tank of LCCL-LC resonant
converter is focused to achieve three objectives: I. Operating at
resonant frequency II. Satisfying output voltage requirement,
III. Zero voltage switching (ZVS) turn on. Finally, 6.78MHz
omnidirectional WPT system is built and 75~85% (mostly
80%+) system efficiency at 5W output is achieved for smart
phone size receiver with free positioning in the setup.
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摘要 :
Due to the rapid adoption of the Electric Vehicles
worldwide, the On-Board/Off-Board Battery Chargers are facing
a lot of challenges. One challenge is the charging time as the petrol
and diesel vehicles can be charged 10 times fas...
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Due to the rapid adoption of the Electric Vehicles
worldwide, the On-Board/Off-Board Battery Chargers are facing
a lot of challenges. One challenge is the charging time as the petrol
and diesel vehicles can be charged 10 times faster the electric
vehicles. A second challenge is power density especially for the onboard
charger which required not to exploit a large space inside
the vehicles. Another challenge is the very wide battery voltage
range which makes it difficult to optimize converter over the
whole battery voltage range and efficiency drops either the
battery voltage is too high or too low. And finally the bi-directional
operation, so that they can support the grid in the peak periods or
even standalone loads. In this paper, a 6.6kW two stage structure
is proposed utilizing a variable DC-link voltage operation. And
one of the most promising challenge in the high-power
applications is implementing the magnetics component into
Printed Circuit Board (PCB). PCB winding transformer has been
widely used in low power applications. Compared with
conventional litz-wire transformer, the manufacture process is
greatly simplified and the parasitic is much easier to control.
However, in high power applications, due to the limitation of high
winding loss and high multi-layer PCB cost, the transformer
design with PCB winding becomes a challenge. The emerging
wideband-gap devices provide the opportunity to adopt PCB
transformer in high power applications. In addition, the low
inductance requirement brought by high frequency also makes it
possible to realize magnetic integration in PCB transformer.
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摘要 :
Due to the rapid adoption of the Electric Vehicles
worldwide, the On-Board/Off-Board Battery Chargers are facing
a lot of challenges. One challenge is the charging time as the petrol
and diesel vehicles can be charged 10 times fas...
展开
Due to the rapid adoption of the Electric Vehicles
worldwide, the On-Board/Off-Board Battery Chargers are facing
a lot of challenges. One challenge is the charging time as the petrol
and diesel vehicles can be charged 10 times faster the electric
vehicles. A second challenge is power density especially for the onboard
charger which required not to exploit a large space inside
the vehicles. Another challenge is the very wide battery voltage
range which makes it difficult to optimize converter over the
whole battery voltage range and efficiency drops either the
battery voltage is too high or too low. And finally the bi-directional
operation, so that they can support the grid in the peak periods or
even standalone loads. In this paper, a 6.6kW two stage structure
is proposed utilizing a variable DC-link voltage operation. And
one of the most promising challenge in the high-power
applications is implementing the magnetics component into
Printed Circuit Board (PCB). PCB winding transformer has been
widely used in low power applications. Compared with
conventional litz-wire transformer, the manufacture process is
greatly simplified and the parasitic is much easier to control.
However, in high power applications, due to the limitation of high
winding loss and high multi-layer PCB cost, the transformer
design with PCB winding becomes a challenge. The emerging
wideband-gap devices provide the opportunity to adopt PCB
transformer in high power applications. In addition, the low
inductance requirement brought by high frequency also makes it
possible to realize magnetic integration in PCB transformer.
收起
摘要 :
Due to the rapid adoption of the Electric Vehicles
worldwide, the On-Board/Off-Board Battery Chargers are facing
a lot of challenges. One challenge is the charging time as the petrol
and diesel vehicles can be charged 10 times ...
展开
Due to the rapid adoption of the Electric Vehicles
worldwide, the On-Board/Off-Board Battery Chargers are facing
a lot of challenges. One challenge is the charging time as the petrol
and diesel vehicles can be charged 10 times faster the electric
vehicles. A second challenge is power density especially for the onboard
charger which required not to exploit a large space inside
the vehicles. Another challenge is the very wide battery voltage
range which makes it difficult to optimize converter over the
whole battery voltage range and efficiency drops either the
battery voltage is too high or too low. And finally the bi-directional
operation, so that they can support the grid in the peak periods or
even standalone loads. In this paper, a 6.6kW two stage structure
is proposed utilizing a variable DC-link voltage operation. And
one of the most promising challenge in the high-power
applications is implementing the magnetics component into
Printed Circuit Board (PCB). PCB winding transformer has been
widely used in low power applications. Compared with
conventional litz-wire transformer, the manufacture process is
greatly simplified and the parasitic is much easier to control.
However, in high power applications, due to the limitation of high
winding loss and high multi-layer PCB cost, the transformer
design with PCB winding becomes a challenge. The emerging
wideband-gap devices provide the opportunity to adopt PCB
transformer in high power applications. In addition, the low
inductance requirement brought by high frequency also makes it
possible to realize magnetic integration in PCB transformer.
收起
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