Енергоефективні електротехнічні системи живлення та керування для багатолампових люмінесцентних світильників

Abstract

Обгрунтовано метод побудови енергоефективних ресурсоекономних електротехнічних систем високочастотного живлення та керування для багатолампових люмінесцентних світильників. Метод базується на поєднанні дискретного регулювання потужності шляхом комутації окремих ламп та наступного неперервного регулювання потужності на міжкомутаційних інтервалах потужності. За рахунок нової структури системи зекономлено N силових ключів та їх драйверів, де N – кількість ламп світильника.

The method of design of energy- and resourse-efficient electrical systems for high-frequency operation of multiple fluorescent lamps lighting installations with their continous-discrete power control is presented in this paper. The method is based on a combination of discrete power control by changing the amount of on-off lamps and further continuous power control on the intercommutation intervals. If the installation running power can be provided by the number of lamps which is smaller than N (N is a lamp number in the installation), the redundant lamps are switched off. Thus the unproductive power consumption for redundant lamps electrode heating is eliminated and the system efficiency is increased. The total power control range is divided into N power intervals. Within each interval the power control is continuous, and the intervals change is discrete by the way of fluorescent lamps tuning on-off. The extention of the first ( lowest) interval, which is enabled only for one lamp, is equal to a half of effective power of fluorescent lamp, which is indicated as the nominal lamp power minus power heating of its electrodes. The remaining (N-1) intervals, which is enabled for more than one lamp, have the same extentions, which are equal to the effective power of one lamp. The control range of each lamp, regardless of the number of lamps in installation, is equal to a half of lamp effective power, which ensures the high quality control. Hysteresis is introduced to ensure the lamps accurate tuning on-off in commutation regions. The analytical expressions for lighting installation power and its efficiency as a functions of running power and number of turn-on lamps are established. Comparison of continous and continous-discrete power control testifies the increasing of system efficiency up to 1,8 times in the case of use of proposed continous-discrete control in 4-lamps installation. To achieve high quality of electric energy and system component reduction the single-stage approach to the system structure design is implemented by combining the stage of power factor corrector and the N stages of high-frequency half-bridge resonance inverters. One inverter is a master inverter and others are slave inverters (semiinverters). Each semiinverter has only one own active switch and utilizes the active switch which is common to all semiinverters and master inverter. Thus N active power switches and their drivers are saved due to such system structure.