Design Of Power Management System Of Aeromagnetic Detection Unmanned Aerial Vehicle

The aeromagnetic detection Unmanned Aerial Vehicle (UAV) are the major pro-ject carried out by the national12thFive-Year Plan for deep exploration (Si-noProbe-09-03-06). As a key sub-system of the UAV, the power management systemhas a great responsibility to provide payload powered for other devices of the UAV.So, developing a high efficiency, high power density and high reliability power sys-tem for the UAV is of great significance. This thesis studies mainly in the followingaspects:Firstly, based on switching power supply control theory according to the perfor-mance indicators of UAV power system, a variety of isolated small power DC/DCconverters are analyzed to select the appropriate topology of low-side active clamp.Secondly, according to the above theoretical analysis, the thesis designs powermanagement system of the aeromagnetic detection UAV. The topic of the powermanagement system consists of two parts: the main circuit module and the powermanagement module. The main circuit module is divided into two parts: the maincircuit power stage design and the main circuit control stage design. The main circuitpower stage design includes design methods of output filter circuit, the bootstrap biascircuit, the output rectifier circuit, power transformers and the active clamp circuit.The main circuit control stage design includes design methods of PWM control circuit,current sharing circuit, relay switch circuit and battery backup circuit. The powermanagement module includes designs of auxiliary power supply circuit, signal detec-tion circuit, redundancy switching circuit, temperature control system and communi-cation circuit.Finally, the thesis uses the software Pspice to simulate the main circuit and detailanalyzes the circuit losses of active clamp forward converter in theory. The analysisresults show that: rectifier circuit loss and PCB board circuit loss are two importantfactors affecting the efficiency of the converter. Based on the above theoretical analy-sis and simulation, a power management system with72V input,12V/15A output isdeveloped successfully. After the completion of the power system indoor debugging,the power management system completes powered task successfully in the UAV fieldoperations.