Modeling and control strategy of HPS electronic ballast considering the dynamic model of the lamp

A Loss-Free Resistor-Based Versatile Ballast for Discharge Lamps

“…The zero is located between 10 and 10 3 rad/s, and the pole between 100 and 10 4 rad/s. In reference [25] the parameters of an specific HPS lamp with z L = −3141.5 rad/s and p L = 18.8 rad/s are given, whereas in reference [26], similar parameters for a 150 W MH lamp with z L = −1850 rad/s and p L = 10,690 rad/s can be found. This illustrates the great variability in the location of p L and z L .…”

“…This illustrates the great variability in the location of p L and z L . The ballast operation with HPS and MH lamps is simulated using the values of [25,26] and the real resonant tank values (L s = 150 µH, C s = 22 nF, and C p = 3.3 nF) of the ballast prototype. The corresponding results are given in Table 1, where Z DC (P) = V res I res .…”

“…Besides, the resonant inverter input impedance Z i (P, s) is given by where Z lamp (P, s) must be replaced by expression (24) in case of using a HPS or MH lamp, or by (25) in case of an IEFL lamp. It is worth remarking that the validity of the small-signal analysis depends on the linearity of the dynamics of the system.…”