• The Transactions of the Korean Institute of Electrical Engineers B
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• v.50 no.10
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• pp.530-535
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• 2001

Resonant-type electronic ballast for a metal halide discharge(MHD) lamp is proposed and implemented for 400W MHD lamp. HID lamps have good color rendition, long life and good focusing capability but they have flickers by acoustic resonance when driven at high frequency. A new control method is employed to remove acoustic resonance related instability in HID lamp. By using the amplitude modulation, a spread spectrum effect is employed on the ballast. The control loop of resonant inverter is analyzed and a current is designed. The ballast consists of a power factor controller, an half-bridge resonant inverter, a simple ignitor and an integrator with OP-amps. The experimental results show the good performance as PF 0.93, ballast loss 22W at output 400W and the conducted EMI level is below 60dBuV.

• Proceedings of the KIEE Conference
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• summer
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• pp.1239-1241
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• 2004

In this paper, electronic ballast with Interleaved Boost Cell is presented. The proposed topology is based on a single-stage ballast which combines a boost converter and a half-bridge series resonant inverter High power factor and low THD(reduction of current ripple) are achieved by using the boost semi-stage operating in discontinuous conduction mode, and inverter semi-stage operated above resonant frequency to provide zero voltage switching is employed to ballast the fluorescent lamp. The experimental results from the ballast system with fluorescent lamps have demonstrated the feasibility of the proposed electronic ballast.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.52 no.3
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• pp.140-146
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• 2003

In this paper, we suggested electronic ballast with the half bridge inverter for the automotive HID lamp. The electronic ballast for the automotive HID lamp should be supplied by the low-frequency square wave avoiding the acoustic resonance. When the HID lamp is hot state, the electronic ballast should supply the sufficient current to the take over to the lamp at the re-strike ignition state for a few milli-second. We have introduced the new take-over current control method that could have control operating frequency and minimize circuits to the take over current circuits.

• Proceedings of the KIPE Conference
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• 2002.07a
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• pp.237-240
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• 2002

A CCFL 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 piezoelectric transformer Is evaluated using an AC analysis. The electronic ballast composed of piezoelectric transformers and ZVS inverter was implemented. It enables a fluorescent lamp to be fumed on stably. Simulation of a high frequency electronic ballast which operates a fluorescent Imp at high frequency is proposed. Simulation is carried out using PSPICE program to illustrate the performance of the circuit

• Journal of Industrial Technology
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• v.23 no.A
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• pp.35-39
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• 2003

There are many kinds of electronic ballast for various kinks of fluorescent lamps. The PFC(Power Factor Correction) circuit in electronic ballast is classified in two types. One is the active PFC and the other is the passive PFC circuit. The active type PFC is higher than the passive type, but the cost of the passive type is cheaper than the active type. In this study, we introduced the modified passive PFC method which is called semi-boost PFC, and then we analyzed and experimented the electronic ballast which is composed of the semi-boost PFC, half-bridge, and LCC resonant tank. Experimental results showed that the $$PF{\geq_-}0.98$$, $$CF{\leq_-}1.4$$ and input current $THD{\approx}15%$.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 1998.11a
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• pp.156-161
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• 1998

The purpose of this paper is to determine circuit parameters in the inverter part of the electronic dimming ballast for fluorescent lamps, that is adequate to use with the prevailing dimming controller IC. Firstly, the operating frequency characteristics are investigated by varying circuit parameters of electronic ballasts and are matched with the output characteristics of dimming ballast controller. Secondly, circuit parameter values are determined by using PSpice simulation and operating frequency characteristics. Finally its validity is verified from the electrical and light output characteristics on the prototype of the electronic dimming ballast.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 1995.10a
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• pp.47-52
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• 1995

This paper presents a new approach in the design of an electronic ballast for fluorescent lamps in the range of 10∼20W. The central point of the design lies in the equivalent concepts for a lamp and for the inverter part of an electronic ballast. The ballast, which adopts half-bridge inverter topology, is designed to adjust ifself to a predefined range of lamp power output by frequency control using MCU. At first, the circuit parameters were estimated using PSpice simulatio, and then were made varied according to the selection of an optimal frequency for each lamp. A series of experiments using fluorescent lamps of 11W, 15W, and 20W were carried out to verify the proposed design. As a result of the experiments, all the three lamps of different kind were run normally with the same ballast under consideration, And the characteristics on lamp starting and light output were satisfactory compared to existen single-output electronic ballasts.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.19 no.8
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• pp.8-12
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• 2005

This paper designed electronic ballast inverter circuit using the PSpice simulation and it compared with practical ballast about electrical characteristics. Used electronic ballast driving type is self-exciting half bridge inverter we have got much the same electrical result both simulation and experiment of practical electronic ballast.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.51 no.10
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• pp.587-594
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• 2002

A low frequency square wave electronic ballast for the high intensity discharge(HID) lamps using fuzzy logic controller is developed. This electronic ballast consists a buck converter, a low frequency square wave full bridge inverter, a high voltage pulse generator for the HID lamp ignition, an over current protection circuit and an 8-bit microcontroller. The ballast system is operated on the constant current mode during the HID lamp start-up process and the system is operated on the constant power mode during steady state. Experimental results show that the fuzzy logic control operation is carried out successfully by the 8-bit microcontroller PIC16F877 In this electronic ballast system, in spite of the limited control bandwidth caused by low operating speed of the microcontroller, the good performance in the constant lamp current characteristic is obtained. Acoustic resonance of the HID lamps can be effectively avoided because the instantaneous In lamp power is fully constant due to the low frequency square wave drive.

• Transactions on Electrical and Electronic Materials
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• v.15 no.1
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• pp.1-6
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• 2014

Self-exciting electronic ballast, of small size, and low cost, and high power, with no stroboscopic effect, no noise, is widely used in the general lighting market. This paper describes the cause of high switching loss of self-exciting electronic ballast, based on its operational principle; then, to reduce the switch temperature and increase the reliability of the product, the drive circuit has been improved, to achieve soft-switching. The theory analysis, simulation and experimental result prove the feasibility and compatibility of this new method in practice. Finally, the design procedure and winding method of the self-exciting current transformer are introduced.