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1. Application Scenarios
UPS (Uninterruptible Power Supply) is used to provide uninterrupted, regulated, and pure power supply to critical loads, and is widely used in data centers, communication base stations, medical equipment, and industrial control. The power range is from 500VA to several MVA.
2. The Role of the Product in the System
| Product category | System Function |
| Rectifier bridge | AC input rectification provides power for PFC and charger |
| PFC diode (SiC/FRD) | Input PFC boost diode |
| Fast recovery diode | Inverter IGBT freewheeling, DC/DC converter rectification |
| SiC diode | High frequency PFC and inverter to improve efficiency |
3. Recommended Product Model
| Product category | Recommended Series/Model | Key Parameters |
| Three-phase rectifier bridge | GBJ/KBJ series (25A – 100A/1200V) | Suitable for medium to high power UPS |
| SiC diode | 650V/1200V（10A–40A） | PFC Efficient Solution |
| Fast recovery diode | FRxx/USR series (600V/1200V) | Continuation and rectification |
4. AC/DC Module Application
● The front-end AC/DC adopts PFC rectifier to convert AC into stable DC bus (400V/800V)
● Recommended three-phase PFC+SiC diode solution, PF>0.99，THD<5%
5. Application of PFC Circuit
● Single phase UPS uses Boost PFC, while three-phase UPS uses three-phase three switch/Vienna PFC
● Recommend SiC SBD+super junction MOSFET combination, supporting high-frequency conversion
6. Common Customer Needs
| Demand | Our Response |
| The efficiency of online mode should be greater than 96% | Recommend SiC solution to reduce switch and conduction losses |
| Battery cold start should be reliable | Provide MOSFET avalanche withstand test data |
| To meet the classification requirements of IEC 62040-3 | Provide corresponding performance test reports |
| Volume limited (rack mounted) | Recommend high-frequency SMD packaged devices to improve power density |
