L-source inverter

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L-source inverter
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L-source inverter

OBJECTIVE:
To design a Coupled-inductor L-source inverter fed a two-stage electronic ballast for metal-halide (MH) lamps.
ABSTRACT:
This paper has presented a two-stage high power factor electronic ballast for MH lamps. The proposed topology is constructed of a single-switch two-output integrated converter and a half-bridge inverter. The input current, constant lamp power control, dc-bus voltage, and boundary condition are analyzed This paper presents a two-stage electronic ballast for metal-halide (MH) lamps. The first stage is a single-switch fly back and buck-boost integrated converter. The post stage is a half-bridge inverter driving the MH lamps with low-frequency square-wave current for avoiding acoustic resonance. The operating principle of the proposed topology is discussed. Also, constant power control is realized using the methodology employed for peak inductor current control.
EXISTED SYSTEM:
conventional electromagnetic ballast is used because it has a simple structure, and is robust and cheap. However, the electromagnetic ballast is operated at the line frequency, which results in large size, heavy weight, and audible noise. Furthermore, the lamp power variation is large when the line voltage and lamp equivalent resistance are changed. Until now, these disadvantages have been overcome by using
acoustic resonance of the MH lamp is a key point for the selection of electronic ballast. Many solutions have been proposed to overcome the acoustic resonance problem: operating the MH lamp in a frequency bandwidth that is free of acoustic resonance.
PROPOSED SYSTEM:
This paper presents a two-stage electronic ballast for the MH lamps. The I SI_stage is a two-output integrated converter with a single-switch, which includes both a fly back and a buck- boost topology, with function of both PFC and lamp power control. The 2nd -stage is a half-bridge inverter and an igniter circuit, which is used to drive
the H1D lamp with low frequency square-waveform sources to prevent acoustic resonance. The simplified HID lamp ballast not only decreases the size of circuit but also reduces the number of active switches. Thus, this paper proposes coupled-inductor L-source. inverter (CL-LSI). The proposed inverter uses an auxiliary switch with an anti-paralleled diode in series with a storage capacitor and coupled-inductor cell to form an L-shape network.
The proposed inverter has the following advantages:
1) The proposed inverter can flexibly work in continuous conduction mode (CCM) and DCM, and solve the dc-link voltage drop while the coupled-inductor cell works in DCM;
2) Compared to CCM, the proposed inverter in DCM can produce the higher voltage gain, reduce the voltage stresses across passive components and lower the coupled-inductor values and power losses;
3) Realizing the common ground to reduce the electromagnetic interference, suppressing the startup current.
REFERENCE:
[I] W. Yan, Y. K. E. Ho, and S. Y. R. Hui, "Stability study and control methods for small-wattage high-intensity-discharge (HID) lamps," IEEE Trans. Ind. Appl., vol. 37, no. 5, pp. 1522-1530, Sep.lOct. 200 I.
[2] M. A. Co, C. Z. Rezende, D. S. L. Simonetti, and 1. L. F. Vieira, "Microcontrolled electronic gear for HID lamps comparisons with electromagnetic ballast," in Proc. IEEE IECON'02, vol. I, pp. 468-472, 2002.
[3] W. Mark, "A study of the high intensity discharge lamp - electronic ballast interface," in Proc. IEEE lAS, vol. 2, pp.1043-1048, 2003.
[1] F. Z. Peng, “Z-source inverter,” IEEE Trans. Ind. Appl., vol. 39, no. 2, pp. 504–510, Mar. 2003.
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