Current-sourcing push-pull parallel-resonance inverter (CS-PPRI): theory and application as a fluorescent lamp driver

Abstract

Abstract.A novel topology, Current-Sourcing Push-pull Parallel-Resonance Inverter (CS-PPRI) was investigated theoretically and experimentally. The proposed power stage is built around a current fed push-pull inverter. The main features of the proposed inverter is a load independent output current and Zero Voltage Switching (ZVS). It I s suggested that the proposed CS-PPRI is a vlable alternative for realizing electronic ballasts for low and high intensity discharge lamps.

Statics and dynamics of fluorescent lamps operating at high frequency: modeling and simulation

“…This issue is further discussed in Section VII. The parameters of (1) ( , ) can be obtained from experimental data [4]. The degree of matching is depicted in Fig.…”

“…Considering the above observations, it is evident that the electrical response of the lamp can be emulated by a behavioral dependent source whose resistance is defined by (1) [4], [5]. Equation (1) can be modified to a dynamic model if the rms current is first derived by measuring the lamp's rms current and then passing it through a low-pass filter that matches the slow response of the lamp.…”

“…Following [4], the equivalent resistance at HF can be expressed as (1) where and are the lamp's constants and is the rms current through the lamp.…”

“…However, a closer examination of fluorescent lamps characteristics reveals that this approximation is very crude and does not take into account many intricate phenomena that may be significant in the analysis and design of electronic ballasts. The deviations from the linear resistor model can be divided into three categories: the dependence of the -curve on the lamp's power level [4]- [6], the nonlinearity of thecurve at a given operating condition [7], [8], and the time-domain response of the lamp to a change in excitation [9], [10]. The latter aspect has many theoretical and practical implications since the dynamics of the lamp are of prime importance when considering stability and response of lamp/ballast systems in open-and closed-loop configurations [10].…”

HF multiresonant electronic ballast for fluorescent lamps with constant filament preheat voltage

“…It follows that the voltage across the lamps during ignition will not be zero, but it can be made low by proper design. Under normal operating conditions, following the preheat stage, the lamps can be represented by a linear resistor R lamp [8], as shown in Fig. 3(a).…”