A Driving Power Supply Of Semiconductorlaser For Simultaneous Transmission Of Power And Information

Recently, UAVs has gained popularity in carrying out the task like monitoring, reconnootring or attacking. Due to its flexilibity; high efficiency and persistance, it has been the multiplier of military power. To further improve the operation performance and adjust to the needs of modern war, the long voyage UAV at high altitude will be the future development direction. Charging the UAV by solar energy is one of the most common approaches, however, limited by the discontinuity of the solar energy, the long voyage would be difficult to realize. Non-contact power transmission would be a better choice to realize the remote and non-contact charging of the UAVs and long voyage without pause. Laser is a better choice due to its unique advantages. Among all kinds of laser, the semiconductor laser is prefered as it has simple structure and easy control of the power by controlling the input current.Based on the remote laser energy transmission system, a new method was proposed by combining different driving ways to realize simultaneous transmission of both power and instructions. First, basic frame of the Laser power beaming system was introduced which included the constitutent part, the working principle of the semiconductor and current research status of the driving power supply of the semiconductor. Second, the equivalent modeling of the semiconductor was introduced for deeper research. Third, the detailed method to transmiss both power and instruction was analyzed how to superpose the pulse current onto the constant current to ensure the transmission of power while transmitting instruction signal. Two converters were paralleled to realize it. By the use of the parallel of the constant-current converter and the bidirectional converter, it can make the inductor current of the bidirectional converter quickly tail after the instruction based on the maximum efficiency. The bidirectional converter chose the easiest buck/boost topology to generate the needed positive or negative pulse current and applied voltage loop and current loop control strategy to force the output current to change according to the signal change while taking the communicational signal as reference.A prototype is built and tested in the lab.The experimental results are presented to validate the theoretical analysis and the feasibility of the method.