摘要
Abstract
In recent years,with the continuous research and development of China's large military ships,the demand for ships'degaussing systems has gradually increased.The earth's magnetic field can magnetize the ship to produce induction magnetic field,which makes the ship very easy to be detected by the enemy's magnetic detection,posing a serious threat to the ship.Therefore,it is necessary to use the degaussing system to generate a magnetic field that is opposite to the magnetic field of the ship,so as to offset the induction magnetic field of the ship.Thus,the degaussing system of the ship is an extremely critical means of protection for the ship.
In order to meet the demand for degaussing system,this paper proposes an energy feedback pulse current degaussing power supply topology.The structure contains a multiple Buck converter with energy storage from lithium batteries,and cascaded full-bridge modules of ultracapacitor.These two parts are connected in series with the input capacitor in parallel to the DC bus,and connected in parallel with the output filter capacitor to the thyristor commutation circuit.The port of the degaussing power supply is drawn from the thyristor commutation circuit and connected to both ends of the degaussing winding.During a current pulse cycle,due to the high instantaneous power required in the rising phase of the pulsed current,while the pulse current platform stage requires a long period of power delivery.Therefore,the ultracapacitor needs to be utilized to provide a large instantaneous power during the pulse current rise phase,while the lithium battery needs to be utilized for power support during the pulse current platform stage.Meanwhile,by bypassing the lithium battery and reversing the input to the ultracapacitor in the falling pulse current stage,then the energy on the degaussing coil can be released quickly,and at the same time,this part of the energy can also be used to recharge the ultracapacitor.
This topology reduces the required switching frequency through the structure of multiple Buck converter;at the same time,the form of cascaded full-bridge modules effectively reduces the voltage stress of the switching device and the high-power energy supply problem in the rising pulse current stage;furthermore,the use of ultracapacitor cascaded full-bridge modules replace the energy dissipation circuit,which greatly reduces the corresponding device and heat dissipation costs.
To verify the analysis of the principle and control strategy of the energy feedback pulsed current degaussing power supply topology,the simulation of the single-supply model and the multiple-supply parallel model are constructed in this paper.In order to verify the control strategy of equalizing voltage and current,the ultracapacitor parameters within the power supply and between multiple power supplies are differentiated.
In this paper,the operation principle of the energy feedback pulsed current degaussing power supply is analyzed;the corresponding control strategy is provided in the case of single-supply model and the multiple-supply parallel model;subsequently,simulation tests are carried out for this topology,and the results of the simulation prove the feasibility of the topology and the control strategy.关键词
消磁电源/超级电容/级联全桥Key words
Degaussing power supply/ultracapacitor/cascaded H-bridge分类
信息技术与安全科学
