Efficiency of an Exciplex DBD Lamp Excited Under Different Methods

Abstract

OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. Abstract-Three different electrical generators have been designed and used to supply an exciplex dielectric barrier discharge lamp in order to elucidate the influence of each one of these supplying strategies over the system performance; the first method consists on supplying the lamp with short bipolar voltage pulses; the second and third methods are based on semiresonant converters were current pulses, of controlled duration and magnitude, are injected into the lamp. For each one of the generators, measurements of the lamp and supply efficiency, are performed and analyzed, at different levels of power (up to 130 W) and operating frequencies (60-90 kHz). From the experimental results, the pulsed voltage-mode approach has allowed obtaining the highest lamp efficiency (7%), yet the maximum supply efficiency is offered by the resonant mode supplies. On the basis of the lamp and the supply efficiencies, the whole system performance is analyzed.Index Terms-Dielectric-barrier discharge (DBD), exciplex lamp, pulsed voltage, resonant converter, ultraviolet.

System for experimental investigation of DBD excilamps in view of control and optimization of UV emission

“…Results shown in last figures agree with previous experimental works, where the current amplitude and the pulse duration have an influence over the lamp efficiency [5,15,26]. This is only a sample of the possible analyses that can be performed using the test-bench developed in this paper, that will help the designers of DBD lamps and power supplies with the optimization of the system-level efficiency.…”

Experimental Study of a Nonthermal DBD-Driven Plasma Jet System Using Different Supply Methods

“…Figure 2 shows the conventional electrical model of a DBD reactor. This model has been successfully employed for modeling reactors with the gas fully contained between the electrodes, such as DBD lamps [13,20]. In the plasma jet, the gas is not confined between the electrodes.…”

“…The power supply, for which the circuit is presented in Figure 4a, is built around a voltage inverter [13], which controls its switching legs to apply short bipolar voltage pulses across the primary winding of a step-up transformer. The secondary winding is connected to the metal electrodes of the plasma reactor.…”

“…The bridge switching frequency, fsw, determines the frequency of the DBD current (45-100 kHz in the present case) [13]. The DCM feature (Figure 6b) makes it possible to predict the energy injected into the jet during each current pulse, using Equation (7).…”

“…The plasma composition and the concentration of reactive species are essential for the treatment. Although the plasma composition is expected to have a lethal effect on pathogenic agents [13], healthy tissues near the infected wound should not be severely affected [14,15].…”