100W-200W SMPS
The key technologies of low-power SMPS are systematically introduced below. The application of SiC diodes is a key breakthrough in improving efficiency. Future development will focus on the collaborative design strategy integrating GaN and SiC devices. Further analysis of the specific topology can be omitted here.
Working Principle & Topologies
100W-200W switch-mode power supplies convert input DC into high-frequency AC through switching devices (MOSFETs/IGBTs), coupled via transformers, then rectified for output. Key topologies include:
Flyback: Low-cost but ~80-85% efficiency, suitable for non-isolated applications like adapters
Forward: Efficiency >90%, requires additional magnetic reset circuit
LLC Resonant: Achieves >95% efficiency via soft-switching, ideal for 200W premium applications
Half-Bridge/Full-Bridge: Used in industrial equipment requiring high power density
Critical Diode Applications
Silicon Carbide Diodes (SiC)
- SiC Schottky structure with reverse recovery time <20ns
- Reduces reverse recovery losses by 75% in LLC secondary rectification
- Voltage rating 600V-1200V, operating temperature up to 175°C
Ultra-Fast Recovery Diodes (UFRD)
- Recovery time 50-100ns, used in forward topology output rectification
- 30% lower cost than SiC but incurs 2-3% efficiency penalty
Schottky Diodes
- Preferred for low-voltage outputs (<60V), forward drop 0.3-0.5V
- Eliminates reverse recovery issues but requires thermal management due to higher leakage current
TVS Protection Devices
- ps-level response time for clamping switching voltage spikes
- Bidirectional TVS for input protection, unidirectional for output protection
Typical Applications
Industrial automation (PLCs, servo drives)
Telecom equipment (5G small cells, optical modules)
Medical electronics (portable device power)
Renewable energy (PV microinverters)
Development Trends
Higher Frequencies: GaN+SiC hybrid designs enabling >1MHz switching
Integration: Single-chip integration of PFC+LLC+synchronous rectification
Intelligence: Digital control for dynamic efficiency optimization
Thermal Innovation: Adoption of 3D power packaging and liquid cooling
The advantages of SMC
SMC, as a globally leading power semiconductor device manufacturer with nearly 30 years of history, can provide customers with the most advanced, efficient, and cost-effective third-generation silicon carbide MOSFETs and silicon carbide JBS diodes. In addition, SMC has unique experience in silicon-based power diode devices, and its best-selling high-power ultra-fast recovery diodes, high current Schottky diodes, and other products are highly praised by customers worldwide. SMC's power semiconductor devices can provide higher efficiency, better reliability, good delivery time, and competitive prices for your products. SMC's professional service team around the world allows you to experience the ultimate customer service experience and safeguard your product design.
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