Комп’ютерне моделювання характеристик дроселя планарної системи люмінесцентної лампи

Abstract

Проведено комп’ютерне моделювання баластного дроселя планарної системи з використанням магнітного середовища нікель-цинкового фериту. Запропоновано рекомендації щодо вибору оптимальних параметрів індуктивного елемента. Показано, що запропонована конструкція магнітопроводу дозволяє отримувати необхідну індуктивність і добротність планарного елемента й зменшити теплові втрати в порівняння з традиційними конструкціями магнітопроводу.

Basing on the analysis of existing structures of the planar system induction coils authors proposed to fill the space between the turns of the coil by the ferromagnetic material. This design will increase the magnetic inductance, and will not increase of the dimension parameters. As the magnetic material nickel-zinc ferrite with specific resistance was chosen. Modeling of magnetic and temperature characteristics was conducted by the Comsol Multiphysics software. It is shown that proposed construction of magnetic makes possible to get get the necessary inductance and quality factor of choke in comparison with traditional designs of magnetic circuit. Based on the investigations, the authors proposed the recommendations concerning the choice of optimal parameters of inductive element, taking into account the index of operating current. It is shown that the small increase of inner orifice radius gives the opportunity to increase inductance with the small change of element’s sizes, while the index of quality factor stays practically unchangeable. Based on the simulation of magnetic and thermic field of choke, it is shown that the layers of insulating material serve as non-magnetic air gap. The elaborated computer model lets choose its thickness for providing the stationary inductance index in the process of remagnetizing. According to the carried out research the operating temperature of the choke doesn’t exceed 70 °C. Such temperature is northing operating temperature range of choke materials, besides it won’t cause the excessive heating of surrounding components in the scheme during operating. The quantity of heat consumptions that in the coil and consumptions in the magnetic circuit is three times less than those with traditional types of magnetic circuit. The simulation (modeling) of work of the discharged stage operating of electronic starting system set in the established mode is held. It is showen that the proposed design of ballast choke provides the necessary indexes of voltage and current during the operating of the luminescent lamp. Due to the reduction of heat consumptions the proposed design increases the efficiency of luminescent lamp power supply system