![[Unifive] AC adapter & switching power supply manufacturer](common/img/header-logo.svg){kind=logo}
Successful mass production case of the industry's smallest 65W AC/DC Power Adapters — Desktop & Wall-Mount for To C.
E-Power Solutions' "DAC (Dual Active Clamp) technology," which brings new innovation to the power industry, has been successfully launched into the market by Unifive as a high-quality mass-produced product. Since its founding in 1989, our company has specialized in the development and manufacture of compact power supplies, and this is a case where our technical expertise has turned an innovative idea into a tangible reality.
Product Overview: Breakthrough Miniaturization Achieved by ADAMON 65W Gen2
Proprietary Technology Enabling World-Class Miniaturization
The ADAMON 65W Gen2 achieves an astonishing compact and lightweight profile with a volume of just 46cc and a weight of 65g. This feat was made possible by combining E-Power Solutions’ Dual Active Clamp Technology (DAC Technology) with Unifive’s decades of power supply manufacturing expertise.
Volume Reduction 42% reduction compared to previous models | Weight Reduction 40% lighter than previous models | Power Efficiency High-efficiency operation at 94% |
Technical Features and Mass Production Challenge Solutions
The core of DAC technology lies in a voltage clamp circuit that limits input voltage to below 250V, combined with a highly efficient active clamp DC-DC converter. This innovative circuit configuration allows the conventionally required 400V-class large electrolytic capacitors to be replaced with smaller components rated below 250V.
When designing this ground-breaking circuit technology as a mass-producible product, Unifive overcame the following technical challenges:
- Optimizing circuit board layout for high-speed switching circuits
- Thorough noise suppression to meet EMI standard (CISPR 32 Class B)
- Efficient heat dissipation design in a compact enclosure
- Compliance with strict safety standards (PSE/IEC 62368-1)
Leveraging this technological advantage, E-Power Solutions has also launched consumer models under the ADAMON brand (ADAMON 65W Gen2 World-Class Small USB-C Charger (Amazon product page)).
Innovative Difference Between GaN AC Adapters and DAC Technology
A Different Perspective from Traditional GaN Approaches
Current mainstream GaN (gallium nitride)-based AC adapters achieve miniaturization through high-performance high-voltage MOSFETs. In contrast, the ADAMON 65W Gen2 achieves equal or better miniaturization using reliable existing Si devices by enhancing MOSFET performance via low-voltage operation through innovative circuit design.
Comparison of Technical Approaches
| Item | Conventional GaN Adapter | ADAMON 65W (DAC Technology) |
|---|---|---|
| Device Used | GaN HEMT with 600–650V rating | High-performance Si MOSFET with 250V rating |
| 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 | Difficult gate drive circuit design | Stable operation using existing control ICs |
Performance Advantages Realized by DAC Technology
By adopting DAC technology, the following advantages are achieved:
- Power Efficiency: High efficiency of 94% (equal or superior to GaN-based models)
- Size: Industry's smallest class at 46cc (even smaller than GaN models)
- EMI Performance: -6dB margin against CISPR 32 regulation
- Reliability: Proven reliability using conventional Si devices