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Three-Phase Current-Mode Power Amplifier Architecture
Reduce switch voltage and current stress
A 13.56 MHz 3-ph current-mode class-D (CMCD) power amplifier implementation
84% better in a 3-ph CMCD and 100% better in a 4-ph CMCD compared to a 1-ph CMCD regarding single switch utilization for a given power
22% more power in a 3-ph CMCD compared to a 1-ph CMCD for a given semiconductor device die area
A 3ph-CMCD hardware prototype at 13.56 MHz achieves a load power of 307.7 W with an efficiency of 87.5%
Multiple circuit configurations
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Fast, Full-Range, Direct-Drive, Continuous Radio-Frequency Power Modulation
Continuously modulate power from maximum to zero with zero-voltage switching for various complex loads
A 13.56 MHz power amplifier implementation
0.08 - 186 W for 75 + j13 Ω
0.03 - 151 W for 99 - j6 Ω
0.03 - 97 W for 140 - j45 Ω
Maximum dc-ac efficiency is 85.0% with 146 W power at 99 - j6 Ω
Maximum power is 186 W with 73.0% efficiency at 75 + j13 Ω
Mutiple circuit implementations
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Space Wireless Power Transfer / DC-DC Converter
Radiation-hardened electronics
A 80 W hardware prototype at 6.78 MHz with 88 % efficiency using Rad-Hard GaN HEMTs
A loosely coupled air-core PCB transformer for isolation
A gate driver composed of off-shelf components with compatible space-grade equivalents
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Wide-Range Switched-Mode Power Amplifier Architecture
Zero-voltage switching for the entire wide-range operation
A 12.55 - 13.56 MHz wide-range class-D power amplifier implementation
A wide “3.6X” (26.7 W - 95.2 W) power range
A wide “4.6X” (5 Ω - 23 Ω) resistive load range
A wide j0 Ω to + j15 Ω reactive load range
Maximum dc-ac efficiency is 86.6% with 108.8 W power at 20 Ω at 13.56 MHz
Maximum power is 126.5 W with 84.7% efficiency at 13 + j15 Ω at 12.55 MHz
Mutiple circuit implementations
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100 MHz Wireless Power Transfer
79% dc-dc efficiency including gating loss for 1 cm gap and 6.9 W load power
Above 80% (83% peak) dc-dc efficiency without gating loss from 1.7 W to 6.9 W load power
Above 79% dc-dc efficiency including gating loss from 4.9 to 6.9 W load power
Current-mode class D (CMCD) power amplifier as transmitter and receiver
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Scalable Architectures for 100 MHz Wireless Power Transfer
Linearly scale up and down power level and transfer distance while maintaining efficiency
Synchronized and identical modular converters drive the segmented coils actively and simultaneously
Partition the power conversion and transmission among modular converters and segmented coils instead of single higher-power ones
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Ultrafast Isolated Gate Driver
Fully utilize the benefits of GaN HEMTs for VHF and pulse power
Ultrafast rise and fall times below 270 ps
Transformer isolation
Variable frequency up to 165 MHz and Variable duty cycles
Arbitrary long on- and off-times
Flexible control inputs
Customized for different GaN HEMTs with small gating loss
Integration possible
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Active Field Cancellation for Miniaturized Wireless Power Transfer
Excellent field cancellation performance with compactness and miniaturization
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Medium Voltage, High Accurate Current Pulse Generator
Flat-top current pulse and fast response time
A modular 4.5 kV pulse generator that delivers a 102 A peak current pulse for an 800 ns flat-top duration and ±1% accuracy
Fully scalable for different timing, voltage, and current requirements through a modular design
Model reduction and waveform shaping ameliorate the effect of the large parasitics
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Talkative, robust, and variable power transfer
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