Charge Pump Power Factor Correction Research Articles

Analysis and Design of Bridgeless Continuous Input Current Charge Pump PFC Converter

This paper presents a design methodology for bridgeless continuous input current charge pump power factor correction (PFC) converter. A new fundamental harmonic approximation-based equivalent circuit model is obtained through the Fourier analysis by examining the fundamental behavior of the charge pump. The operating characteristics of the converter are analyzed and the procedure for designing is discussed. To verify the effectiveness of the design method, three simulation circuits under different conditions of operation are designed by the proposed procedure. The characterization of a 55-60 W experimental prototype converter design using the proposed design procedure is presented. Besides, the measured bus voltage is compared with that calculated by the model, and the result shows the good accuracy of the proposed model. The performance of the simulation circuits and the prototype meet the design requirement, showing the validity of the design method.

Improved Charge Pump Power Factor Correction Electronic Ballast Based on Class DE Inverter

This paper proposes fluorescent electronic ballast with high power factor and low line input current harmonics. The system performance can be improved by a charged pump circuit. Details of design and circuit operation are described. The proposed electronic ballast is modified from single-stage half bridge class D electronic ballast by adding capacitor parallel with each power switch and setting the circuit parameter to operate under class DE inverter condition. By using this proposed method the DC bus voltage can be reduced around by 50% compare with conventional class D inverter circuit. Because the power switches are operated at zero voltage switching condition and low dv/dt of class DE switching. The experimental results show that the proper frequency of the prototype is around 50 kHz with input power factor of 0.982, <TEX>$THD_i$</TEX> 10.2% at full load and efficiency of more than 90%.

Design and Implementation of Novel Single-Stage Charge-Pump Power-Factor-Correction Electronic Ballast for Metal Halide Lamp

This paper presents a novel single-stage charge-pump (CP) power-factor-correction (PFC) electronic ballast for metal halide (MH) lamps driven with the low-frequency square-wave current to avoid the acoustic-resonance problem. In order to achieve high power factor (PF) and meet the International Electrotechnical Commission (IEC) regulation, the CP PFC technique is applied to the full-bridge inverter of the conventional electronic ballast. Based on the analyses of the operational modes for the proposed electronic ballast, the design criteria of the CP components and the main inductor in the full-bridge inverter for the proposed electronic ballast are presented. A prototype circuit for a 35-W MH lamp is implemented to confirm the presented design criteria.

Design of Fluorescent Lamp Ballast With PFC Using a Power Piezoelectric Transformer

An investigation of a high-power piezoelectric transformer (PT) as a potential component for a fluorescent lamp (FL) ballast with power factor correction (PFC) is discussed. The attractiveness of the PT is primarily the simplicity of the resulting circuit, and it is easy to be produced in mass with a low cost. A single-stage charge-pump PFC ballast using a PT is proposed. The proposed ballast circuit improved the drawbacks of the conventional voltage-source charge-pump PFC (VS-CPPFC) scheme. Empirical PT modeling based on power level excitation is performed to design the proposed circuit, and the experimental and simulation results are provided to verify theoretical analysis.

Charge pump power-factor-correction technologies. II. Ballast applications

For pt.I see ibid., vol.15, no.1, p.121-9 (2000). Charge pump power-factor-correction (CPPFC) converters using voltage-source (VS) CPPFC, current-source (CS) CPPFC, and continuous input current (CIC) CPPFC techniques are developed in this paper. Design considerations and the performance of the CPPFC electronic ballasts are discussed, analyzed, and evaluated. The experimental results show that 0.99 power factor and 10% total harmonic distortion (THD) can be achieved. It is shown that the CPPFC techniques are very attractive.

Charge pump power-factor-correction technologies. I. Concept and principle

Charge pump power-factor-correction (CPPFC) technologies, including voltage-source (VS) CPPFC, current-source (CS) CPPFC, and continuous input current (CIC) CPPFC, are presented in this paper. The charge pump concept for achieving PFC and its unity power factor conditions are derived and analyzed, The developed CPPFC techniques use a capacitor to achieve PFC function.

Single-switch electronic ballast with continuous input current charge pump power-factor correction

This paper presents a single-switch electronic ballast with continuous input current charge pump power-factor correction. The ballast circuit is composed of a series/parallel inverter, a charge pump power-factor corrector, and a dimming controller. The characteristics and design considerations of this ballast are discussed in this paper. Dimming control is achieved by varying the switching frequency. The frequency-modulation scheme is used to reduce the low-frequency output current ripple. A prototype of a 36WT8 fluorescent lamp ballast has been implemented and tested. Experimental results verify the analytical derivations.

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.

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.

New charge pump power-factor-correction electronic ballast with a wide range of line input voltage

A new charge pump power-factor-correction (CPPFC) electronic ballast with a wide range of line input voltage is proposed in this paper. Circuit derivation and DC-bus voltage stress at start-up mode are discussed. The average lamp current control with switching frequency modulation is developed to achieve constant lamp power operation and low-crest factor. The proposed CPPFC electronic ballast is analyzed, implemented, and evaluated. It features continuous line input current, low total harmonic distortion (THD), constant lamp power operation, low-crest factor, and less switching current stress with low-DC-bus voltage stress for the line voltages from 180 to 265 V.

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.

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

A charge pump power-factor-correction (CPPFC) power converter is first derived, and its unity power factor condition is then reviewed. A single-stage power-factor-correction electronic ballast using the charge pump concept is analyzed. The 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 (THD) with lamp power variation within /spl plusmn/15% when the line input voltage changes /spl plusmn/10%.