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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 a new innovation to the power supply industry. Unifive has successfully launched this groundbreaking circuit technology as a high-quality mass-produced product. Since its founding in 1989, the company's expertise in the development and manufacturing of compact power supplies has turned innovative ideas into tangible solutions.
Product Overview: ADAMON 65W Gen2 Achieves Exceptional Miniaturization
Proprietary Technology Achieving One of the World’s Smallest Sizes
The ADAMON 65W Gen2 has achieved an astonishingly compact and lightweight design at just 46cc in volume and 65g in weight. This was made possible by combining E-Power Solutions' Dual Active Clamp Technology (DAC Technology) with Unifive's extensive experience in power supply manufacturing.
Volume Reduction 42% less vs. conventional products | Weight Reduction 40% lighter than conventional products | Power Efficiency 94% high efficiency |
Technical Features and Mass Production Challenges Overcome
The core of DAC Technology lies in a voltage clamping circuit that limits the input voltage to below 250V, combined with a high-efficiency active clamp DC-DC converter. This circuit architecture enables the replacement of traditional bulky 400V-class electrolytic capacitors with smaller components rated below 250V.
To turn this breakthrough circuit technology into a mass-producible product, Unifive solved the following technical challenges:
- Optimization of PCB design for high-speed switching circuits
- Thorough noise suppression to meet EMI standards (CISPR 32 Class B)
- Efficient thermal design in a compact enclosure
- Compliance with strict safety standards (PSE/IEC 62368-1)
As an example of a product leveraging this technological advantage, E-Power Solutions offers a commercial model in the ADAMON brand line (ADAMON 65W Gen2 Ultra-Compact USB-C Charger (Amazon product page)).
Difference Between GaN AC/DC Power Adapters — Desktop & Wall-Mount and DAC Technology
A Different Conceptual Approach from Conventional GaN
GaN-based AC/DC Power Adapters — Desktop & Wall-Mount, now mainstream in the market, achieve miniaturization through the "improved performance of high-voltage MOSFETs using GaN." In contrast, the ADAMON 65W Gen2 achieves equal or better compactness through innovative circuit design and improved performance of low-voltage MOSFETs using reliable existing Si devices.
Comparison of Technical Approaches
| Item | Conventional GaN Adapters | 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 through ZVS (Zero Voltage Switching) |
| Control Circuit | Difficult gate drive circuit design | Stable operation with existing control ICs |
Performance Superiority Achieved by DAC Technology
Advantages realized through the adoption of DAC Technology include:
- Power Efficiency: Achieves 94% efficiency (equal to or higher than GaN-based)
- Size: 46cc, one of the industry’s smallest (smaller than GaN counterparts)
- EMI: -6dB margin against CISPR 32 standard
- Reliability: High reliability from proven Si devices