Pontifical Catholic University of Rio Grande do Sul Porto Alegre - RS LOW COST HIGH POWER FACTOR ELECTRONIC BALLAST FOR HIGH PRESSURE SODIUM LAMPS Apresentador: Reinaldo Tonkoski Jr.

Table of Contents  INTRODUCTION  OBJECTIVES  THE HPF ELECTRONIC BALLAST  BALLAST DESIGN  SIMULATION RESULTS  EXPERIMENTAL RESULTS  CONCLUSIONS

INTRODUCTION -Illumination Segment consume was Estimated to be 30 % of total Electrical Energy produced in the world;

OBJECTIVES - Develop an electronic ballast for a 250 W HPS lamp with high power factor and low cost. - Develop an electronic ballast for a 250 W HPS lamp with high power factor and low cost.

■ Voltage ■ Current HID NEGATIVE RESISTENCE

ELECTRONIC BALLAST CONVENTIONAL IMPLEMENTATION

HPF ELECTRONIC BALLAST TOPOLOGY

LAMP IGNITION VOLTAGE DESIGN CRITERIA

Current Voltage  0 =3  s DESIGN CRITERIA FREQUENCY RESPONSE

CIRCUIT SIMPLIFICATION (AFTER IGNITION) Frequency Domain First Harmonic

CIRCUIT EQUATIONS (AFTER IGNITION) Where:

BALLAST DESIGN ABACUS

DESIGN ESPECIFICATION Mains: V o = 220 V Switching Frequency: F s = 68 kHz Lamp Rated Power: P = 160 W Lamp Rated Voltage: V l = 80 V Lamp Rated Resistance: R = 40 Ω L = 220  H C s = 500 nF C p = 2,7 nF

SIMULATION RESULTS LAMP IGNITION VOLTAGE

SIMULATION RESULTS LAMP VOLTAGE AND CURRENT AFTER IGNITION

SIMULATION RESULTS

Experimental Results

C F = 500 nF C F = 1  F C F = 2,2  F

Experimental Results C F = 500 nF C F = 1  F C F = 2,2  F

CONCLUSIONS  This paper described a single stage high power factor electronic ballast for high pressure sodium lamps.  This ballast presents a very low cost because it avoids an external PFP.  The phenomenon of the acoustic resonance should not be observed because the HPS lamp is excited by a modulated power signal.

CONCLUSIONS  A very high power factor was obtained at low power.  The crest factor found was not good enough and must be improved.

Obrigado!