A Dual-Mode Wireless Power Transfer Using Multi-Frequency ...
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A Dual-Mode Wireless Power Transfer Using Multi-Frequency Programmed Pulse Width Modulation Chongwen Zhao, Daniel Costinett The University of Tennessee, Knoxville Objective and Motivation • Simultaneously power multiple wireless devices • Allow for different receiver standards (~100 kHz and 6.78 MHz) • Use standard hardware developed for single-frequency applications WPT Transmitter DC/DC Battery Charger I dc I p I s1 DC/DC Battery Charger I s2 Fig.1 Proposed system block diagram Multi-frequency Programmed PWM f specturm ... Fundamental k th Harmonic ... V θ 1 θ 2 θ 3 θ n ... ... 1. Purpose: Calculate solution sets of switching instances: θ 1 , θ 2 ,.. Θ n 2. Method: Newton-Rasphon numeric iteration algorithm 3. Modulation Scheme investigated: Bipolar and Unipolar MFPW 4. Desired outputs: 101.2 kHz and 6.78 MHz 5. Total odd harmonics under control: 33 V ab V LF V HF V LF V HF Desired Spectrum Fourier Expansion Modulation Solution Dual-mode Operation Q 1 Q 2 Q 3 Q 4 + V dc - I dc + V ab - a b C T100 L T100 L R100 R LLF R LHF C R100 C T6.78 L T6.78 C R6.78 L R6.78 k 1 k 2 Voltage Gain @101. 2 kHz Voltage Gain @6.78 MHz Fig.2 Circuit model of dual-mode operation Fig.6 Cross interference reduction 101.2 kHz Channel 6.78 MHz Channel GaN-Based Inverter V ab (10V/div) V load100 (5V/div) V load6.78 (12.5V/div) 2μs/div Conclusion and future work Simultaneous 100kHz and 6.78MHz dual-mode operation Verified on a 10 W GaN-based WPT prototype Ability to regulate power to each load on simple full bridge power stage Future investigations on hardware design and efficiency optimization Reconstruction Result Time domain result Spectrum result Fig.3 Bipolar MFPWM waveforms and spectrum(LF = 0.5, HF = 0.9 normalized amplitude) Fig.4 Dual-mode operation waveforms (top to bottom: inverter output, 101.2 kHz receiver, 6.78 MHz receiver) Fig.5 Unipolar MFPWM waveforms and spectrum (LF = 0.6, HF=0.34, normalized amplitude)
Transcript of A Dual-Mode Wireless Power Transfer Using Multi-Frequency ...
A Dual-Mode Wireless Power Transfer Using
Multi-Frequency Programmed
Pulse Width Modulation
Chongwen Zhao, Daniel Costinett
The University of Tennessee, Knoxville
Objective and Motivation • Simultaneously power multiple wireless devices
• Allow for different receiver standards (~100 kHz and 6.78 MHz)
• Use standard hardware developed for single-frequency applications WPT
Transmitter
DC/DCBattery Charger
Idc Ip Is1
DC/DCBattery Charger
Is2
Fig.1 Proposed system block diagram
Multi-frequency Programmed PWM
fspecturm
...
Fundamental kth
Harmonic
...
V
θ1 θ2θ3 θn
... ...
1. Purpose: Calculate solution sets of
switching instances: θ1, θ2,.. Θn
2. Method: Newton-Rasphon numeric
iteration algorithm
3. Modulation Scheme investigated:
Bipolar and Unipolar MFPW
4. Desired outputs: 101.2 kHz and 6.78 MHz
5. Total odd harmonics under control: 33
Vab VLF VHF
VLF
VHF
Desired Spectrum
Fourier Expansion
Modulation Solution
Dual-mode Operation
Q1 Q2
Q3 Q4
+
Vdc
-
Idc
+
Vab
-
a
b
CT100
LT100 LR100RLLF
RLHF
CR100
CT6.78
LT6.78
CR6.78
LR6.78
k1
k2
Voltage Gain @101. 2 kHz Voltage Gain @6.78 MHz
Fig.2 Circuit model of dual-mode operation
Fig.6 Cross interference reduction
101.2 kHz
Channel
6.78 MHz
ChannelGaN-Based
Inverter
Vab (10V/div)
Vload100 (5V/div)
Vload6.78 (12.5V/div)
2μs/div
Conclusion and future work Simultaneous 100kHz and 6.78MHz dual-mode operation
Verified on a 10 W GaN-based WPT prototype
Ability to regulate power to each load on simple full bridge power stage
Future investigations on hardware design and efficiency optimization
Reconstruction Result
Time domain result
Spectrum result
Fig.3 Bipolar MFPWM waveforms and spectrum(LF = 0.5,
HF = 0.9 normalized amplitude)
Fig.4 Dual-mode operation waveforms (top to bottom:
inverter output, 101.2 kHz receiver, 6.78 MHz receiver)
Fig.5 Unipolar MFPWM waveforms and spectrum
(LF = 0.6, HF=0.34, normalized amplitude)
