Two reference designs have been published by Texas Instruments which focus on the battery management system and techniques for increasing the flight time of the drones. Flight time plays a very crucial role in designing of drones and these designs can help manufacturers to increase the efficiency of the drones.
In the reference designs, the main goal is on two major parameters which can increase the Flight Time for the drones – a robust battery management system and an efficient speed control design for BLDC Motors. The reference designs are provided with complete BoM, schematics and software use instructions to increase the ease for any designer.
The 2S1P Battery Management system
The 2S1P battery Management system is designed to work with Li-ion cells in which modification can be done like adding a capacity meter, low voltage cutoff and also increase the capacity of the battery by 2 series 1 Parallel Cell approach. It means if you increase cells in series, it increases the total voltage of the battery pack and If you increase the cells in parallel, it increases the total capacity of cells in terms of ampere-hour.
The battery management system design also integrates bq24600 battery charge controller which provides regulated charging to the battery packs. It is also equipped with Current sensor and reverse polarity protection for prevention of motors from the stall conditions.
Sensorless High-Speed Field of Control Design (ESC)
Texas Instruments is also providing a solution in the field of designing an efficient motor controller. The sensorless High-speed Field of Control design focuses on creating an efficient electronic speed controller (ESC) to increase the flight time of the drone without affecting the discharge rate of the battery pack. The design features an ESC circuit tested at 1.2Khz for about 12000 rpm at a 6 pole sensorless brushless motor. The ESC can support up to 24 Volts and have distinctive features like fast speed reversibility and temperature sensing for motor winding. The electronic speed controller is equipped with TI’s Fast software so that it can be easily programmed and debugged.
The increase in Flight Time will also help in finding more applications which can be performed through unmanned aircrafts and will lead to some more innovations contributing to the growing technologies.