Tokushi Yamauchi

Current source charge pump power factor correction electronic ballast

Current source charge pump power factor correction (CS-CPPFC) electronic ballast is presented in this paper. Unity power factor condition and operation principle using the charge pump concept are derived and analyzed. Based on the steady state analysis, the design considerations are discussed in detail. It is shown that the power switch only deals with the resonant load current, which is the same as in the two-stage approach. This feature is very attractive, since the switch in the integrated single-stage power factor correction converter has to carry the current not only from input but also from the load. The developed current source charge pump electronic ballast can save one choke inductor, and has a potentially low cost. The current source charge pump electronic ballast was implemented and tested. It is shown that 0.992 power factor and 9.0% THD can be achieved for 85-watt fluorescent lamps.

A fluorescent lamp model for high frequency wide range dimming electronic ballast simulation

A fluorescent lamp model for high frequency dimming electronic ballast simulation is presented in this paper. The model can be utilized for an electronic ballast simulation with continuous dimming and transient mode simulation such as step dimming. The model is implemented using SPICE and verified with experimental results, resulting in good agreement down to 1% dimming level.

Analysis, design and experiments of a high power factor electronic ballast

A charge pump high power factor converter cell is first derived, and its unity power factor condition is then reviewed. A single stage high power factor electronic ballast using the charge pump concept is then analyzed. Design criteria are derived to optimize the electronic ballast based on the steady state analysis. Constant lamp power operations associated with its control are also discussed. Large signal simulation and experimental results verify the theoretical analysis. It is shown that the designed electronic ballast has 0.995 power factor and 5% total harmonic distortion with lamp power variation within /spl plusmn/15% when the line input voltage changes /spl plusmn/10%.

New continuous-input current charge pump power-factor-correction electronic ballast

Continuous-input current charge pump power-factor-correction (CIC-CPPFC) electronic ballasts are proposed in this paper. The CPPFC circuit and unity power factor condition using the charge pump concept are derived and analyzed. The average lamp current control with switching frequency modulation was developed so that low crest factor and constant lamp power operation can be achieved. The developed electronic ballast has continuous input current, so that a small line input filter can be used. The proposed CIC-CPPFC electronic ballast was implemented and tested with two 45 W fluorescent lamps. It is shown that the measured line input current harmonics satisfy IEC 1000-3-2 Class C requirements.

Charge pump power-factor-correction dimming electronic ballast

A voltage-source charge pump power-factor correction (CPPFC) continuous dimming electronic ballast is proposed in this paper. The basic charge pump PFC principle is presented, and its unity power factor condition is then reviewed. Constant lamp power control and crest factor correction technique in dimming mode operation are then discussed. A continuous dimming controller with average lamp current control and duty-cycle modulation is developed so that the lamp is able to operate in constant power and low crest factor from 20% to 100% dimming level. The developed dimming electronic ballast has features of higher than 0.99 power factor, low crest factor, and low-DC-bus voltage.

A new continuous input current charge pump power factor correction (CIC-CPPFC) electronic ballast

A continuous input current charge pump power factor correction (CIC-CPPFC) electronic ballast is proposed in this paper. Circuit derivation and unity power factor condition using the charge pump concept are derived and analyzed. The power switch only deals with the resonant load current which is the same as the two-stage approach. The developed electronic ballast has continuous input line current so that a small line input filter can be used. The proposed CIC-CPPFC electronic ballast was implemented and tested. It is shown that switching current stress is only half of the integrated single stage electronic ballast. 0.992 power factor and 10.5% THD can be achieved with two 45-watt fluorescent lamps.

A single-stage electronic ballast with power factor correction and low crest factor for fluorescent lamps

A new single-stage power factor correction electronic ballast using the charge pump concept is proposed in this paper. Circuit derivation, principle of operation and the conditions for achieving unity power factor are discussed. The proposed electronic ballast is implemented and tested. It is shown that 0.987 power factor, 13% THD, and 1.6 crest factor can be obtained with two 40-watt fluorescent lamps in series. The lamp power variation range is automatically limited within /spl plusmn/15% for /spl plusmn/10% line input voltage variation without any feedback control, and the maximum DC bus voltage across the bulk capacitor during the preheat and start-up modes is less than 415 V for 220 V line input so that a 450 V rated bulk capacitor can be used.

Charge pump high power factor dimming electronic ballast

Voltage source charge pump power factor correction dimming electronic ballast is presented in this paper. The basic charge pump power factor correction principle is first reviewed. Constant lamp power control for the line input variation and crest factor correction technique is then discussed. The lamp power variation is limited to less than /spl plusmn/15% when the line changes /spl plusmn/10% by using lamp current modulation. The crest factor can be minimized by injecting 2/sup nd/ order line harmonic in the control loop. The developed dimming electronic ballast was able to be continuously dimmed from 20% to 100% dimming level with higher 0.99 power factor and low DC bus voltage.

An improved charge pump power factor correction electronic ballast

An improved charge pump power factor correction (CPPFC) electronic ballast using the charge pump concept is proposed in this paper. Circuit derivation, principle of operation, and the conditions for achieving unity power factor are discussed. The proposed electronic ballast is implemented and tested with two 40 W fluorescent lamps. It is shown that 84% of overall efficiency and 1.6 of crest factor can be achieved with 200-V line input voltage. The measured line input current harmonics satisfy IEC 1000-3-2 Class C requirements. The lamp power variation range is automatically limited within /spl plusmn/15% for /spl plusmn/10% line input voltage variation without feedback control.