TFSBEC01 - High Efficient Power Supply with Measuring Circuit for UAVs
The TFSBEC01 module is designed to provide a stable and efficient power supply for medium-power UAV components such as servos, autopilots, and other accessories. It also includes a measurement system for monitoring current and voltage, which is essential for demanding UAV applications where real-time consumption data is required.
Features
- Input Voltage: 6 - 40 V (Equivalent to 2S to 9S Li-Po batteries)
- Output Voltage: 5.4 V, 5 A (Adjustable; based on the PX4 standard)
- Current Measurement Range: 0 - 50 A
- Current Measurement Sensitivity: 39.6 mV/A
- Voltage Measurement Range: 0 - 40 V
- Size: Approx. 46 x 30 mm
- Compatibility: Designed for Pixhawk-based drones but can be used in other UAV systems.
Technical Specifications
| Parameter | Value | Description |
|---|---|---|
| Input Voltage | 6 - 40 V | Supports 2S to 9S Li-Po batteries |
| Output Voltage | 5.4 V, 5 A | Adjustable based on PX4 standards |
| Current Measurement | 0 - 50 A | Range for measuring current |
| Current Sensitivity | 39.6 mV/A | |
| Current Offset | 330 mV | From component datasheet |
| Voltage Divider | 10.13 | From the schematic |
| Regulator Technology | Switched step-down | |
| Connectors | XT30 | Max current: 15 A |
| Size | 46 x 30 mm | Approximate PCB dimensions |
Components
- LMR14050 - 5 A Step-down Converter with 40 V input voltage
- ACS780 - High-Precision Current Sensor with 50 A capability
PX4 Parameter Configuration
For Pixhawk systems, the following parameters can be used to set up the module:
- BAT1_A_PER_V = 25.2525
- BAT_V_OFFS_CURR = 0.33
- BAT1_V_DIV = 10.13
To estimate current values accurately, the equation used by the QGC system is:
Where:
A = 25.2525(BAT1_A_PER_V)B = 0.33(BAT_V_OFFS_CURR)
For precise calibration, it is recommended to use QGC’s built-in measurement feature to adjust these parameters based on the specific piece in use, but precise calibration is not required in cases where %5 precision is acceptable. For more details, refer to the LMR14050 and ACS780 datasheets.