Product overview
Nanjing Airfly Electronic Technology Co., Ltd.’s Kitefly A3(400S50, 950g) is a power conversion module for applications including tethered drone brushless motor systems. Its AF-400S50-3K DC-DC supply uses a modular architecture within a 167×99×53 mm envelope and weighs ≤0.95kg. This component configuration provides a compact power supply for integration into a larger system. The enclosure carries IP67 protection, while thermal management uses forced air cooling. Its operating temperature range is -40°C to +55°C, defining the stated temperature limits for integration.
Electrical integration requires a 360–410Vdc input, with a maximum of 415Vdc. Output is 44–51.2Vdc / 65A, with separate ratings of 3000W continuous and 3400W peak; peak efficiency reaches up to 98%. The module supports current sharing and redundant operation in parallel configurations. Battery transition is described as seamless, with no voltage transients, and ripple is less than 280mVp-p. Output overcurrent, short-circuit, overvoltage and overtemperature protections are incorporated. A fast dynamic response and MTBF of ≥100,000 hours complete the stated electrical and reliability characteristics.
Specifications
| Specification | Value & conditions |
|---|---|
| Manufacturer | Nanjing Airfly Electronic Technology Co., Ltd. |
| Brand | Kitefly |
| Product model | A3(400S50, 950g) |
| Power module designation | AF-400S50-3K |
| Hardware type and purpose | DC-DC power supply for applications including tethered drone brushless motor systems |
| Dimensions | 167×99×53 mm |
| Ingress protection | IP67 |
| Input voltage | 360–410Vdc (max 415Vdc) |
| Output voltage and current | 44–51.2Vdc / 65A |
| Continuous power | 3000WContinuous output. |
| Peak power | 3400WPeak output. |
| Peak efficiency | Up to 98% |
| Cooling | Forced air cooling |
| Electrical and thermal protections | Output overcurrent, short-circuit, overvoltage, and overtemperature protection |
| Parallel capability | Supports current sharing and redundant operationParallel operation. |
| Weight | ≤0.95kg |
| Operating temperature | -40°C to +55°C |
| MTBF | ≥100,000 hours |
| Battery transition behavior | Seamless battery transition with no voltage transientsDuring battery transition. |
| Ripple | Less than 280mVp-p |
| Dynamic response | Fast dynamic response |
| Architecture | Modular design |
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