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Successful mass production case of the industry's smallest 65W AC/DC power adapters for To C — desktop & wall-mount.
E-Power Solutions' "DAC (Dual Active Clamp) Technology" brings new innovation to the power supply industry. Unifive has successfully launched this groundbreaking circuit technology to the market as a high-quality mass production product. Since its founding in 1989, our company has specialized in the development and manufacturing of compact power supplies—this case exemplifies how our technological capabilities turned an innovative idea into a tangible product.
Product Overview: Unprecedented Miniaturization Realized by ADAMON 65W Gen2
Proprietary technology that achieves one of the world's smallest sizes
The ADAMON 65W Gen2 achieves an astonishing miniaturization and lightweight design with a volume of only 46cc and a weight of 65g. This was made possible by the combination of Dual Active Clamp Technology (DAC Technology) developed by E-Power Solutions and Unifive's extensive power supply manufacturing expertise.
Volume Reduction 42% reduction compared to previous models | Weight Reduction 40% lighter compared to previous models | Power Efficiency High-efficiency operation at 94% |
Technical Features and Mass Production Challenges Addressed
At the core of DAC Technology lies its voltage clamp circuit that limits input voltages to under 250V and a highly efficient active clamp DC-DC converter. This innovative circuit composition enables the replacement of traditional large 400V-class electrolytic capacitors with smaller components under 250V.
In developing a mass-producible product based on this breakthrough circuit technology, Unifive resolved the following technical challenges:
- Optimizing PCB design for high-speed switching circuits
- Comprehensive noise countermeasures to meet EMI standards (CISPR 32 Class B)
- Efficient thermal design in a compact chassis
- Compliance with strict safety standards (PSE/IEC 62368-1)
Capitalizing on this technological superiority, E-Power Solutions has released a commercial model under the ADAMON brand (ADAMON 65W Gen2 World’s Smallest Class USB-C Charger - Amazon Sales Page).
GaN AC/DC Power Adapters — Desktop & Wall-Mount vs. the Innovation of DAC Technology
A Different Approach from Traditional GaN Technology
Currently mainstream GaN-based AC/DC Power Adapters — Desktop & Wall-Mount focus on “enhancing MOSFET performance with high-voltage tolerance through GaN.” In contrast, ADAMON 65W Gen2 achieves equal or better miniaturization using existing, reliable Si devices through “enhanced MOSFET performance by reducing voltage tolerance” via innovative circuit design.
Comparison of Technological Approaches
| Item | Traditional GaN Adapter | ADAMON 65W (DAC Technology) |
|---|---|---|
| Device Used | 600–650V GaN HEMT | 250V high-performance Si MOSFET |
| Miniaturization Method | High-frequency operation | Component downsizing via input voltage clamping |
| EMI Measures | Countermeasures via high-speed switching | Low EMI via ZVS (Zero Voltage Switching) |
| Control Circuit | Challenging gate drive circuit design | Stable operation with existing control ICs |
Performance Advantages Realized by DAC Technology
By adopting DAC Technology, the following advantages are achieved:
- Power Efficiency: Achieves 94% efficiency (comparable or superior to GaN products)
- Size: Industry’s smallest class at 46cc (smaller than GaN products)
- EMI Performance: 6dB margin below CISPR 32 standard
- Reliability: High reliability using proven Si devices